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Zonge GDP-32 User Manual

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1.

Introduction

1.1

Warranty ................................................................... 2

1.2

Product Information .................................................. 3

2.

Description Of The GDP-32

2.1

Overview................................................................... 2

2.2

Specifications ............................................................ 3

II

2.3

Case........................................................... 8

3.

System Start Up

3.1

Initial Receiver Check............................................... 2

3.2

Powering Up The GDP-32

3.3

Shutting Down The GDP-32

3.4

Charging Batteries..................................................... 6

4.

Quick Start

4.1

Introduction............................................................... 2

4.2

Receiver Start-Up...................................................... 3

4.3

Enter Survey Parameters ........................................... 5

4.4

Calibration................................................................. 7

4.5

System Check.......................................................... 11

4.6

Synchronization ...................................................... 13

4.7

Acquire Field Data .................................................. 15

4.8

Check Data In The Data Cache............................... 15

4.9

Data Transfer To A Computer ................................ 16

5.

Accessing Programs

5.1

The Main Program Menu .......................................... 2

5.2

Field Survey Program Screens .................................. 5

5.3

Scaling .................................................................... 13

6.

Receiver Setup

6.1

Calibration................................................................. 2

6.2

Synchronizing Timing Circuits ............................... 14

6.3

Measuring Contact Resistance ................................ 27

6.4

Setting The Powerline Notch Filter......................... 28

6.5

Gains ....................................................................... 29

6.6

Bits Of Resolution................................................... 38

7.

Handling Data

7.1

Monitoring Analog Signals ....................................... 2

7.2

Viewing Data ............................................................ 3

7.3

Accessing Caches...................................................... 7

7.4

Initializing Caches................................................... 10

7.5

Configuring Ports.................................................... 11

7.6

Outputting Data....................................................... 13

7.7

Input Antenna Calibration Data .............................. 16

7.8

Up-Loading Program Files Via The LAN............... 18

7.9

Connecting the GDP-32

GDP-32

Table of Contents

LABELS

Introduction

II

Receiver

Description

II

...................................... 4

II

................................... 5

Quick Start

Access

Setup

Data

II

to a Laptop via Network. 19

II

Manual

8.

RPIP

8.1

Introduction .............................................................. 2

8.2

Program Operation ................................................... 3

8.3

Data Collection ......................................................... 7

8.4

Field Configurations ............................................... 14

9.

TDIP

9.1

Introduction .............................................................. 2

9.2

Program Operation ................................................... 3

9.3

Data Collection ......................................................... 8

9.4

Sample Data Blocks................................................ 15

9.5

Algorithms .............................................................. 17

9.6

Time Domain Window Timing Information .......... 18

9.7

Field Configurations ............................................... 19

10. CR / HACSAMT

10.1 Introduction .............................................................. 2

10.2 CR Program Operation ............................................. 3

10.3 Gathering Data........................................................ 10

10.4 A Note On Phase .................................................... 16

10.5 A Note On Scaling.................................................. 16

10.6 3-Point Decoupling................................................. 17

10.7 Sample Data Blocks................................................ 18

10.8 Notes On Field Configurations............................... 20

10.9 Sample Menus For 'LABROX' Option ................... 21

10.10 Sample Menus For 'HACSAMT' Option................ 24

10.11 Field Configurations ............................................... 26

11. CSAMT

11.1 Introduction .............................................................. 2

11.2 Fixed Function Keys................................................. 3

11.3 CSAMT Program Operation..................................... 4

11.4 Gathering Data........................................................ 11

11.5 A Note On Variable A-Spacing .............................. 16

11.6 A Note On Phase .................................................... 16

11.7 A Note On Scaling.................................................. 16

11.8 Restrictions ............................................................. 17

11.9 Sample Data Blocks................................................ 21

11.10 Notes On Field Configurations............................... 22

11.11 Magnetic Coil Connections .................................... 22

11.12 Field Configurations ............................................... 23

11.13 Magnetic Sensors Field-Check ............................... 25

LABELS

RPIP

TDIP

CR

CSAMT

November 2002

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Summary of Contents for Zonge GDP-32

Page 1: Table Of Contents
Introduction Introduction RPIP RPIP Warranty ..............2 Introduction .............. 2 Product Information ..........3 Program Operation ........... 3 Data Collection ............7 Description Of The GDP-32 Receiver Description Field Configurations ..........14 Overview..............2 Specifications ............3 TDIP TDIP GDP-32 Case............
Page 2 13.10 Cascade Decimation Overview ....... 24 18.11 Local Area Network (LAN) Connection ....10 13.11 Data Dump Utility........... 26 18.12 Black Screen When Resetting The GDP-32 ..10 13.12 Time Series File Format.......... 26 18.13 Observe Proper Turn-Off Procedure....... 10 13.13 Time Schedule ............
Page 3: Introduction
1. INTRODUCTION 1.1 WARRANTY................2 1.2 PRODUCT INFORMATION ............ 3 ..................... 3 ARDWARE ...................... 5 OFTWARE May 2002...
Page 4: Warranty
SCR diodes. These items are considered consumable and are not warranted by Zonge. This warranty is in lieu of all other warranties, expressed or implied on our part. Zonge may make statements as to the suitability or fitness of the product covered by this warranty for particular purposes.
Page 5: Product Information
INTRODUCTION TO THE GDP-32 PRODUCT INFORMATION Client: Address: Contact: Phone: Fax: RECEIVER MODEL: SERIAL NUMBER: DELIVERY DATE: HARDWARE Analog Boards (BD183) Serial Number: Date sent: Notes: Serial Number: Date sent: Notes: Serial Number: Date sent: Notes: Serial Number: Date sent:...
Page 6 GDP-32 INSTRUCTION MANUAL Timing and Calibrate Board (BD244 or BD288) Serial Number: Date sent: Notes: Serial Number: Date sent: Notes: Front Panel Board (BD287) Serial Number: Date sent: Notes: Serial Number: Date sent: Notes: CPU Board (it/SLC ) Serial Number:...
Page 7 INTRODUCTION TO THE GDP-32 SOFTWARE EPROMs Version Sent RPIP Version Sent Version Sent TDIP Version Sent CSAMT Version Sent Version Sent AMT/MT Version Sent OTHER Version Sent Section 1, Page 5 May 2002...
Page 8 2. DESCRIPTION OF THE GDP-32 RECEIVER 2.1 OVERVIEW ................2 2.2 SPECIFICATIONS..............3 ................4 LECTRICAL PECIFICATIONS ................ 5 ECHANICAL PECIFICATIONS 2.3 GDP-32 CASE ................8 I/O P ............. 10 ETER AND ANELS ....................11 RONT ANEL I/O P ) ..............15...
Page 9 DC to 8 kHz bandwidth. The GDP-32 design is the result of over 25 years experience with its predecessors, the GDP-12, GDP-16 and GDP-32. Its design emphasizes software flexibility, optimum data quality, practicality and ruggedness for harsh field conditions. The GDP-32 is supported by a complete set of geophysical services at Zonge Engineering.
Page 10: Description Of The Gdp-32
Programs are stored on an internal flash disk and are software-selectable. Users can also develop custom survey applications using the C programming language. However, this is a complicated undertaking and should only be attempted with assistance from Zonge Engineering. The GDP-32 operates in both the Frequency Domain and Time Domain.
Page 11 GDP-32II INSTRUCTION MANUAL ELECTRICAL SPECIFICATIONS General Description: Broadband, Multi-channel digital Electromagnetic receiver Frequency Range: DC to 8 kHz Numbers of Channels: 16 (maximum) Survey Capabilities: Resistivity, IP (time and frequency domain), FEM, MMR, CR, CSAMT, HACSAMT, TEM, NanoTEM, AMT, MT Software Language: C and assembly Power:...
Page 12 DESCRIPTION OF THE GDP-32 RECEIVER Digital Section Microprocessors: 586 CPU Memory: 16 Mb dRAM Mass Storage: 32 Mb flash disk (256 Mb optional) (program and data) Hard disk drives with capacities to 4.1 Gb. Serial Ports: 2 RS-232C ports (16650) standard...
Page 13 GDP-32II INSTRUCTION MANUAL Figure 2.1 - Large Case GDP-32 May 2002 Section 2, Page 6...
Page 14 DESCRIPTION OF THE GDP-32 RECEIVER Figure 2.2 - Small Case GDP-32 Section 2, Page 7 May 2002...
Page 15: Gdp-32 Ii Case
The large case GDP-32 (Figure 2.1) permits the installation of up to sixteen analog channels for the DC to 8 kHz range. The small case GDP-32 (Figure 2.2) permits the installation of up to six channels. The central portion of the case contains the analog cards and timing/calibrate card.
Page 16 DESCRIPTION OF THE GDP-32 RECEIVER Output Output 8 9 10 8 9 10 Output Output Output Output 8 9 10 8 9 10 Analog Meters Binding Post Inputs, Channels 1 through 8 Channel Select Switches CASE GROUND GROUND ZONGE ENGINEERING &...
Page 17 The Meter and I/O Panels, mounted on the inside of the case lids, are used for monitoring multi- channel signals. While these panels are not required for receiver operation, they provide more versatility in the field. Each GDP-32 is configured with an appropriate Meter and I/O panel based on the number of channels specified at purchase.
Page 18 Operator communication with the internal machine is provided through this panel. 1. Liquid Crystal Display (LCD) The 480 by 320 pixel, ½ VGA LCD presents GDP-32 information to the operator. The LCD by default displays the upper left quarter of a normal 640 x 480 display. To view other quarters of the screen, press followed by one of the rotary entry keys.
Page 19 Press to turn on the receiver, after pressing the main power button on the I/O panel on the left side of the GDP-32 case. To turn off the GDP, press this key and hold down until you hear a series of single “beeps”. See Sections 3.2 and 3.3.
Page 20 DESCRIPTION OF THE GDP-32 RECEIVER 8. Designated-Function and Soft-Function Keys There are six fixed-function keys located beneath the Soft Function Keys below the LCD screen. – Places the receiver in Data Mode. See Section 7 - Handling Data. – Exits Data or Acquisition Mode and returns to the Main Program Menu.
Page 21 GDP-32II INSTRUCTION MANUAL SELECT UP SELECT DN - Parameters contained in certain fields have a set number of pre- Home selected values. These values are contained in a “Rotary Table” and are accessed by using the select keys. Note that these keys do not move the cursor but only select a value found in the rotary table.
Page 22 See Section more information. 2. POWER ON/OFF The main power control to the receiver. To turn ON the GDP-32 Press the button on the side panel. POWER ON/OFF ON/OFF Press on the Front Panel. There will be a short delay and several menus will be displayed during the warm-up sequence.
Page 23 5. GPS OPTION Optional equipment on the GDP-32 , an internal GPS receiver. 6. BATTERY CHARGE The Battery Charge port connects the GDP-32 to a battery charger or to an external 12- volt DC power supply. May 2002 Section 2, Page 16...
Page 24 DESCRIPTION OF THE GDP-32 RECEIVER CALIBRATOR CASE CAL+ CAL- Figure 2.7 (a) - Analog I/O Panel for the small case GDP-32 INPUT CHANNELS 1-6 ANALOG I/O CASE CAL+ CAL- CALIBRATOR INPUT CHANNELS 1-8 Figure 2.7 (b) - Analog I/O Panel for the large...
Page 25 GDP-32II INSTRUCTION MANUAL ANALOG I/0 PANEL The Analog I/O Panel is located on the right side of the receiver. The small case GDP-32 configured for six-channel input and the large case for sixteen-channel input. Figure 2.7(a) shows the small case Analog I/O panel. Figure 2.7(b) shows the large case Analog I/O panel.
Page 26: System Start Up Start Up
16 C )..........2 ARGE UP TO HANNELS GDP-32 )..........3 MALL UP TO HANNELS 3.2 POWERING UP THE GDP-32 ..........4 3.3 SHUTTING DOWN THE GDP-32 ......... 5 ................... 5 OWER 3.4 CHARGING BATTERIES ............6 ................. 6 INGLE HARGERS UC-2 U ................
Page 27: Initial Receiver Check
Remove the receiver from its shipping case and inspect it for exterior damage due to shipment. If there is anything more than cosmetic damage contact Zonge Engineering immediately.
Page 28 3. Verify that each board is firmly mounted and that all cables are firmly connected to the appropriate boards. Verify that the retaining bar across the bottom of the card cage is firmly attached. NOTE: All 6-channel GDP-32 ’s are pre-wired for 6 channels regardless of how many channels were ordered.
Page 29: Powering Up The Gdp-32
GDP-32 INSTRUCTION MANUAL POWERING UP THE GDP-32 Turn the Crystal Oscillator ON 1. Locate the button on the Control I/O panel on the side of the GDP. POWER ON/OFF Press the button once. The “CRYSTAL ON” light on the front panel will turn ON.
Page 30: Shutting Down The Gdp-32
Cache Field Data validated. Cache memory approximately 11542 KB Timing board initialized. Calibration board initialized. Resetting analog boards. SHUTTING DOWN THE GDP-32 Turn Power Off Go to the first menu, press (Utilities), then (Turn Off Power). Wait until the ON/OFF logo appears on the screen.
Page 31: Charging Batteries
UC-2 UNIVERSAL CHARGER The UC-2 battery charger works with 85 to 264 VAC and 45 to 440 Hz. 1. Plug the charger cable into the port on the GDP-32 BATTERY CHARGER 2. Plug the UC-2 into a power outlet. 3. Turn the UC-2 on.
Page 32: Introduction
4. QUICK START 4.1 INTRODUCTION............... 2 4.2 RECEIVER START-UP ............3 4.3 ENTER SURVEY PARAMETERS .......... 5 4.4 CALIBRATION ................7 ..............7 NTERNAL ALIBRATION UMMARY .............10 XTERNAL ALIBRATION UMMARY 4.5 SYSTEM CHECK ..............11 ................11 YSTEM HECK UMMARY 4.6 SYNCHRONIZATION ............13 4.7 ACQUIRE FIELD DATA ............
Page 33: Introduction
More complete operating instructions are available for each topic in later sections of this manual. Simple menus make operating the GDP-32 straightforward. The easiest way to become familiar with the receiver operation is to try the various software options.
Page 34: Receiver Start-Up
QUICK START RECEIVER START-UP 1. Power Up the receiver by cycling the button on the Control I/O Power ON/OFF panel. This applies power to the oven-stabilized Crystal Oscillator and illuminates the Crystal Oscillator Power Light on the Front Panel. ON/OFF 2.
Page 35 GDP-32 INSTRUCTION MANUAL 4. Check the date and time. If the settings are incorrect, press ZONGE ENGINEERING 11.8 12 Jan 00 17:16:16 GDP32II320 to enter the “Set Date and Time” program. Press 1) Set Date and Time 2) Utilities NEXT FIELD...
Page 36: Enter Survey Parameters
QUICK START ENTER SURVEY PARAMETERS Each Field Survey Program has four primary screens where survey parameters are entered. 1. Initial Program Screen Enter the Array type, Mode, etc. (depending upon survey type), and press Enter 2. Operation Information Screen This screen displays semi-permanent data. Enter the value for OPERATOR, TX ID (Transmitter ID), A-SP (A-Spacing or Dipole Spacing), JOB, LINE, SPREAD (as needed) and press Enter...
Page 37: Calibration
GDP-32 INSTRUCTION MANUAL For CSAMT the numbers beside the H-field designators in the column Sta/Ant are coil serial numbers for coil calibrations. The last digit signifies the antenna type: A single channel ANT/1 CSAMT antenna ends in 0. A dual channel ANT/2 ends in for channel 1 or for channel 2.
Page 38: System Check
QUICK START CALIBRATION Calibrations are performed from the Data Acquisition Screen of the Survey Program to be calibrated. CAUTION: Performing a calibration overwrites any previous calibration data for that program. INTERNAL CALIBRATION SUMMARY 0151 RPIP0613 11.7 26 Jan 00 20:31:58 NOTE: The following summary is based Survey D-D on the TDIP, RPIP or CSAMT Survey...
Page 39 GDP-32 INSTRUCTION MANUAL 0151 RPIP0613 11.7 26 Jan 00 20:32:46 Survey D-D 700N 60, 5 1 Hx 16 Cycles Tx Curr 1) Internal 7. Press for “Internal” 2) External voltage source. (Press 1 – 2, ESCAPE): 0151 RPIP0613 11.7 26 Jan 00 20:33:14...
Page 40 QUICK START 9. Press The program Enter now sets all gains to 1, and 0151 RPIP0613 11.7 26 Jan 00 20:33:33 Survey D-D pauses to enable the operator to 700N 60, 5 Ical change gains and attenuator 1 Hz 16 Cycles Tx Curr settings.
Page 41 GDP-32 INSTRUCTION MANUAL EXTERNAL CALIBRATION SUMMARY 1. Connect the peripheral equipment to be included in the calibration. (See Figure 6.1 for an example of how to connect an Isoamp to the calibration circuit for referenced CR measurements.) 2. Set the frequency to the lowest frequency to be used in your survey. (e.g. 0.125 Hz) 3.
Page 42 QUICK START SYSTEM CHECK System checks are performed from the Data Acquisition Screen of the Survey 0151 RPIP0613 11.7 26 Jan 00 20:31:58 Survey D-D Program to be checked. 700N 60, 5 1 Hz 16 Cycles Tx Curr SYSTEM CHECK SUMMARY 1) Create new calibrate records 1.
Page 43 The program will go directly from automatic gain setting to data acquisition. 8. The GDP-32 receiver will now: Stack and average the calibrate signal Calculate a standard error of the mean (SEM) on the real- time parameter...
Page 44: Synchronization
QUICK START SYNCHRONIZATION The Utility program guides the user through instructions ZONGE ENGINEERING 11.8 04 Jan 18 16:38:23 GDP32II320 automatically set up the GDP-32 for a synchronization check. NOTE: You must have a good calibrate in FDCALS, since the RPIP program is used Turn on XMT and GDP.
Page 45 GDP-32 INSTRUCTION MANUAL 6. If a fast beep sounds while pressing any of the crystal adjust keys, no more adjustment 0575 SYNC0537 11.7 04 Jan 18 16:39:06 is avaliable on that particular Tx 2 Rx 3 N OUT Esys 8.35 v key.
Page 46: Acquire Field Data
QUICK START ACQUIRE FIELD DATA (For survey specific settings refer to the individual Survey Program sections). 1. Enter the appropriate Survey Program from the Program Menu, and enter the information required in each of the following screens. 2. Connect the field wires from the receiver electrodes to the input connectors for each channel.
Page 47: Data Transfer To A Computer
2. Open a data file in your computer by using HyperTerminal or other similar data transfer or terminal program. Configure the program to capture data as text. 3. On the GDP-32 press to enter Data Mode. 4. At this point it may be necessary to configure the serial port.
Page 48 5. ACCESSING PROGRAMS 5.1 THE MAIN PROGRAM MENU..........2 1 – S ..............2 PTION 2 – U ..................3 PTION TILITIES 9 - F ............ 4 PTIONS IELD URVEY ROGRAMS 5.2 FIELD SURVEY PROGRAM SCREENS ....... 5 ................6 NITIAL ROGRAM CREEN...
Page 49: The Main Program Menu
This section reviews the procedures for accessing the receiver functions. The Main Program Menu [MJR1]is the first operating selection the user makes, and is the main branching point for all receiver functions. ZONGE ENGINEERING 11.8 12 Jan 08 17:16:16 GDP32II320 1) Set Date and Time 2) Utilities...
Page 50 The Utilities Menu has eight choices: Utilities Option 1 - Set automatic startup This option allows the user to specify a ZONGE ENGINEERING 12.3 09 Dec 99 08:17:24 complete startup initialization routine for HAARP320 the receiver. This routine is executed each time the receiver is turned on.
Page 51 GDP-32 INSTRUCTION MANUAL Utilities Option 8 – GPS Status Displays the status of the internal GPS timing, if the GPS system is installed. Gives the number of satellites being tracked and whether or not the receiver is in time sync with the GPS system.
Page 52: Field Survey Program Screens
ACCESSING PROGRAMS FIELD SURVEY PROGRAM SCREENS Each Field Survey Program has four primary screens. Survey parameters are entered as described below or described by the specific Field Survey Program Section. Press to move to the next screen or to return to the previous screen. Enter Escape Screen 1 - Initial Program Screen...
Page 53 GDP-32 INSTRUCTION MANUAL INITIAL PROGRAM SCREEN The Initial Program Screen accepts the initial survey information. The first line of the screen displays the selected program, version, battery voltage, and current date and time. User Programmable Fields Not all fields listed are necessary for each Survey Program.
Page 54 ACCESSING PROGRAMS NOTE: Some values are not registered in computer memory until you exit the parameter field. An exception to this rule is the Hz (frequency) field.. Whenever you change the frequency it is automatically changed through the timing card. However, the anti-alias filter is not changed until just prior to data acquisition.
Page 55 GDP-32 INSTRUCTION MANUAL OPERATOR INFORMATION SCREEN Semi-permanent survey information is entered into the Operator Information Screen. This Field information will be changed infrequently and makes up header text preceding data in the Data Cache . (The RPIP Survey Program is used as the example for this discussion.)
Page 56 ACCESSING PROGRAMS CHANNEL PARAMETERS SCREEN Enter channel parameters as outlined in each Field Survey Program Section into the Channel Parameters Screen. User Programmable Fields Available channels are displayed on the 0810 RPIP0612 11.0 19 Jan 08 14:32:19 screen. For each channel (for the RPIP OPER dbf TX ID 1234 A-SP 6 Survey Program) set the channel parameter...
Page 57 GDP-32 INSTRUCTION MANUAL Note: A number (0810) is visible before the program designator (RPIP 0528). This number is the label of the last data block written to the data cache. The next time a block of data is written to the cache, it will be numbered 0811.
Page 58 Calibrations, System Checks, or Set Gains tools are accessed from the Data Acquisition Screen by pressing the corresponding Fixed Function Key. User Programmable Fields Transmitter location. Zonge Engineering recommends using the lowest numbered electrode of the dipole (or the electrode for a transmitting pole).
Page 59 GDP-32 INSTRUCTION MANUAL Frequency selection. NOTE: Most parameters are not registered in the computer memory until the field is exited. An exception to this rule is the Hz (frequency) field. Whenever the frequency is changed the new frequency is automatically changed through the timing card. However, the anti-alias filter is not changed until just prior to data acquisition.
Page 60: Scaling
ACCESSING PROGRAMS SCALING The following convention is used for all measured and calculated parameters: Voltage (magnitudes) – displayed in volts Current – displayed in amperes Phase – displayed in milliradians Apparent resistivity – displayed in ohm-meters Dipole spacings – displayed in meters or feet SP –...
Page 61 6. RECEIVER SETUP 6.1 CALIBRATION ................2 MT/AMT ............. 2 PECIAL NSTRUCTIONS ............. 3 NITIALIZING THE ALIBRATION ACHE ................. 5 TARTING A ALIBRATION ................6 UTOMATIC ALIBRATION ..........9 TOPPING A ALIBRATION HILE ROGRESS ....................9 YSTEM HECK .............. 11 UALITIES OF A ALIBRATION ...............
Page 62: Calibration
GDP-32 INSTRUCTION MANUAL CALIBRATION Calibration routines are generic for all Field Survey Programs. Calibrations are initiated from each Survey Program’s Data Acquisition Screen. Calibration data are stored in the survey program’s calibration cache and automatically applied to all acquired survey data.
Page 63 RECEIVER SETUP INITIALIZING THE CALIBRATION CACHE It is good field practice to initialize the Survey Program Calibration Cache before performing a calibration. This avoids confusion about the most recent calibration. For example: Yesterday, a calibration was run from 0.125 to 8192 Hz. Today, a calibration was run from 1 to 8192 Hz.
Page 64 GDP-32 INSTRUCTION MANUAL 5. Select the survey program calibration cache to be initialized. 6. The following warning appears: VER 320 Current:Field Data Remaining:3388KB WARNING: The contents of this calibrate Cache will be INITIALIZED To proceed, press Continue To abort, press Escape 7.
Page 65 Perform the calibration using that filter setting, and then acquire the field data with the same filter setting. If a different setting is required, either recalibrate at the new filter setting, or input new calibrations into the GDP-32 using a calibration data set stored previously on a field computer.
Page 66: Automatic Calibration
GDP-32 INSTRUCTION MANUAL AUTOMATIC CALIBRATION Ensure that the starting frequency is set at the desired values for the calibration. The calibration can be started at any frequency. 0151 RPIP0613 11.7 26 Jan 00 20:32:16 Zonge recommends beginning Survey D-D calibration at the lowest survey frequency...
Page 67 RECEIVER SETUP ANALOG I/O PANEL PATCH PANEL CALIBRATOR CASE CAL+ CAL- CASE INPUT CHANNELS 1-6 ANALOG I/O ISO/I Isolation Amplifier Figure 6.1 - Wiring for an external calibration – large case with Patch Panel using an isolation amplifier on the reference channel. Use an internal calibration for standard operations.
Page 68 This process is repeated until the maximum frequency has been calibrated. The program then returns to the starting frequency and exits the automatic calibration mode. Zonge recommends immediately performing a system check (see Section 6, page 10) at any frequency to spot-check the automatic calibration.
Page 69 RECEIVER SETUP STOPPING A CALIBRATION WHILE IN PROGRESS NOTE: To avoid confusion, Zonge strongly recommends that the entire calibration be performed in one continuous sequence, rather than in segments. If a problem arises that requires the calibration to be prematurely aborted, it is recommended that the entire sequence be repeated after resolving the issue.
Page 70 Watch the screen to see how it adjusts the gains. The program goes directly from automatic gain setting to data acquisition. 7. The GDP-32 receiver: Stacks and averages the calibration signal...
Page 71 2. Recalibrate the receiver, and dump this file to the personal computer (See Sections 6.1, 7.6). 3. Process the data through the Zonge SHRED program, and provide both the good and bad calibration files. SHRED will remove the bad calibration and renormalize the data with the good calibration.
Page 72 GDP-32 INSTRUCTION MANUAL Table 6.1 - Examples of Good RPIP Calibration Values Note: Values vary from board to board, depending upon components and filters. Magnitudes are normalized to the magnitude at the lowest calibration frequency; phases are in milliradians. NOTCH FILTER SELECTION...
Page 73 RECEIVER SETUP Initial State: signal frequency from Transmitter Controller receiver and controller crystals are different Receiver After Triming Oscillator: signal frequencies are now the same but are out of Phase by After Pressing RESET on XMT: receiver and controller divider chains are now at same frequency and in phase synchronization...
Page 74: Synchronizing Timing Circuits
INSTRUCTION MANUAL SYNCHRONIZING TIMING CIRCUITS FREQUENCY ADJUST AND SYNCHRONIZING OPERATIONS The timing circuits of the XMT-32 and the GDP-32 are comprised of an ultra-stabilized 4.980736 MHz oscillator and a digital counter chain providing a binary sequence of frequency divisions. Frequencies on the XMT-32 Transmitter Controller are selectable from a push-button panel switch.
Page 75 RECEIVER SETUP Figure 6.3 – Connecting the GDP-32 Receiver and XMT-32 Transmitter Controller for synchronization. Section 6, Page 15 May 2002...
Page 76 INSTRUCTION MANUAL ANALOG I/O PANEL CALIBRATOR CASE CAL+ CAL- INPUT CHANNELS 1-6 ANALOG I/O TRANSMITTER CONTROLLER Figure 6.4(a) - Wiring for verifying synchronization to a small case GDP-32 CAL+ CAL- CASE CALIBRATOR INPUT CHANNELS 1-8 CH 2 CH 1 ANALOG I/O...
Page 77 1. Disconnect the Battery Charger. 2. Connect the synchronization cable between the I/O port on the XMT-32 Transmitter Controller and the TRANSMITTER I/O port on the Control I/O panel of the GDP-32 receiver (Figure 6.3.) 3. Switch the PHASE/BATT switch to the BATT position to check the transmitter controller battery voltage.
Page 78 GDP-32 INSTRUCTION MANUAL 6. Press Enter ZONGE ENGINEERING 11.8 04 Jan 18 16:38:23 GDP32II320 Turn on XMT and GDP. Then wait 1 hour. Set XMT to 1 Hz and 100% DUTY CYCLE. 7. Continue follow screen instructions external ZONGE ENGINEERING 11.0 04 Jan 18 16:38:37 connections: (see Figure 6.4)
Page 79 RECEIVER SETUP 9. To electronically adjust the crystal frequency of the GDP-32 to match that of the XMT- 32 use the cursor control keys and follow the instructions on the display: While adjusting the frequency of either instrument, the XMT-32...
Page 80 The oscillator is properly adjusted if the needle drifts less than the distance between two meter marks over a 30 second interval. 7. If the PHASE needle does not stop after setting the crystal adjustment on the GDP-32 mid-range and manually trimming the XMT-32 oscillator, it is necessary to adjust the crystals in either the GDP-32 or XMT-32.
Page 81 Losing battery power to either the transmitter controller or the receiver Re-adjusting the OSC TRIM pot on the transmitter controller Malfunction of the timing chain, crystal heater, crystal, timing boards, etc. The GDP-32 or XMT-32 receives a sharp jolt Synchronization is NOT LOST under the following circumstances: Turning off the receiver using Utilities Menu Option 6 –...
Page 82 GDP-32 INSTRUCTION MANUAL Master Master Slave Receiver Controller Slave Slave Slave MULTI/SY-16 "Sync Box" Master Slave Master Slave Receiver Receiver Receiver Receiver adjust adjust oscillator oscillator Sync Box Sync Box Transmitter Transmitter Controller Controller Master Slave Receiver Receiver Sync Box...
Page 83 1. Obtain a MULTI/SY-16 Sync Box (Figure 6.5(a)) and extra synchronization cables (one per receiver) from Zonge Engineering. Designate one receiver as master and the rest as slave receivers. 2. Connect a synchronization cable between the Transmitter I/O port of the master GDP receiver and the transmitter controller's I/O port, as shown in Figure 6.5(b).
Page 84 GDP-32 INSTRUCTION MANUAL SC-8 Serial Input Transmitter I/O GDP-4 GDP-3 GDP-2 GDP-1 XMT-32S MULT/SY-32 Sync Box Transmitter Controller Figure 6.6 (a) - MULT/SY-32 Synchronization Box Figure 6.6 (b) - Synchronizing a system of multiple receivers May 2002 Section 6, Page 24...
Page 85 4. Using the selector switch on the MULT/SY-32 Sync Box, adjust the oscillator on each GDP-32 until the needle on the XMT-32 comes to rest. CAUTION: DO NOT PRESS RESET ON THE XMT-32 UNTIL ALL GDP-32 S ARE ADJUSTED! 5. After adjusting all receivers, press RESET. If the receivers and transmitter controller are connected correctly, the needles on the receivers’...
Page 86 RESET on the master controller.) Check the synchronization To check the synchronization of the two transmitter controllers and one GDP-32 receiver: 1. Enable three channels on the GDP-32 2. Connect the cal output on one transmitter controller to channel 2 on the receiver.
Page 87: Measuring Contact Resistance
(Refer to the different survey program sections for instructions on connecting wires to the receiver.) Zonge Engineering recommends measuring the contact resistance between the potential electrodes (pots) and the ground before acquiring data. A contact resistance measurement provides information on the status of the pots.
Page 88: Setting The Powerline Notch Filter
CuSO .) In dry ground, it may be necessary to use two pots hooked in parallel to lower the resistance. Zonge also manufactures potential electrode amplifiers (APOT) for use where the contact resistance cannot be reduced sufficiently by passive means.
Page 89: Gains
RECEIVER SETUP GAINS HOW GAINS ARE DEFINED There are two ways of expressing gains in the GDP-32 : as a multiplier, and as a binary gain number. Gains are expressed by the relation G = 2 (where “G” is actual multiplicative gain, and “g”...
Page 90 SETTING GAINS To set Gains, all receiving wires must be connected to the receiver. 1. Turn on the transmitter. 2. On the GDP-32 , enter the Data Acquisition Screen for the survey program. 3. Select the Frequency and set the Current level.
Page 91 RECEIVER SETUP Option 6 – Turn OFF (or ON) noisy gain mode Noisy Gain mode: (default setting – except for TEM) Works with automatic gain ranging Permits a maximum signal of ±1.0 volts (providing headspace for SP drift) Puts the Gains into the second stage first (G2) and then adjusts the Gain of the first stage (G1), if necessary.
Page 92 GDP-32 INSTRUCTION MANUAL Definition of Signal Voltage V a) Clean field signal b) Noisy field signal c) Very noisy field signal d) Signal with SP drift Figure 6.7 - Definition of signal strength for purposes of setting receiver gains. May 2002...
Page 93 RECEIVER SETUP OPTION 1 – FULLY AUTOMATIC GAIN-SETTING In the fully automatic gain-setting mode, the receiver automatically reviews all parameters and sets gains more efficiently and effectively than any other method. Always use this option for normal field surveys. Features Adjusts SP and sets Gains automatically, without specific instructions, each time frequency, transmitter current, Rx, Tx, N, station number, powerline notch filter or delay (for TEM) are changed and data collection is started.
Page 94 GDP-32 INSTRUCTION MANUAL Select . The receiver returns to the Data Acquisition Screen. If the receiver is NOT in fully automatic mode, Option 1 reads: 1) Turn on full automatic mode OPTION 2 – AUTOMATIC GAIN SETTING Automatic gain setting mode is used primarily to adjust the signal level without actually taking data.
Page 95 RECEIVER SETUP 8. Zero the SP (press 9. Manually gain the GDP-32 It is best not to manually adjust G1 without an oscilloscope. Confine adjustments to G2. Increment gain stage G2 until the signal level is just below ±2 volts (needle ±20 on meter), or until the maximum gain (64) is reached.
Page 96 GDP-32 INSTRUCTION MANUAL OPTION 4 – CLEARING GAINS AND SP In addition to automatic and manual gain setting, the operator can set all gains to unity with the gain-setting routine. 1. From the Data Acquisition Screen, press to view the gain setting menu.
Page 97 RECEIVER SETUP Press to enable NOISY gain mode. The receiver then returns to the Data Acquisition screen. The NOISY gain mode can be used with either the fully automatic or manually initiated automatic gain modes (Options 1 and 2.) The receiver adjusts gains automatically as in Options 1 and 2, but the maximum allowable signal is ±1.0 volt.
Page 98: Bits Of Resolution
GDP-32 INSTRUCTION MANUAL BITS OF RESOLUTION NOTE: This section is provided mainly for those operators that want to use the manual mode for setting gains. The automatic modes provide for maximum resolution in their algorithms. It is important to utilize as much of the 16-bit A/D resolution as possible when using the GDP- .
Page 99 RECEIVER SETUP Table 6.2 - Bits of Resolution of the GDP-32 Receiver B' = B + g0 + g1 + g2 + a B' is bits of resolution B is the unity-gain bits in this Table g0, g1 and g2 are binary gains of the three gain stages...
Page 100 7.7 INPUT ANTENNA CALIBRATION DATA ......16 ..............17 AMING NTENNA ALIBRATIONS 7.8 UP-LOADING PROGRAM FILES VIA NETWORK ..18 :..............18 RANSFER ERIES ILES 7.9 CONNECTING THE GDP-32 TO A LAPTOP VIA NETWORK ................19 GDP T : ..........19 ONNECT APTOP OMPUTER May 2002...
Page 101: Monitoring Analog Signals
Small, battery-powered oscilloscopes manufactured for field use are well suited for geophysical applications and are recommended for monitoring field noise. However, they are rarely needed in field operations. The GDP-32 measures noise and sets gains more efficiently than an operator.
Page 102: Viewing Data
DATA, FILE AND PROGRAM TRANSFER VIEWING DATA Limited data are displayed on the receiver's LCD, but the full data set is stored in memory and can be viewed at any time that the receiver is not actually taking data. Calibrations and various types of data are stored in specifically defined and protected areas in memory (data caches.) The data can be output to either a peripheral printer device via the parallel port, or to a personal or mainframe computer via the serial port or a LAN.
Page 103 GDP-32 INSTRUCTION MANUAL Zonge Engineering recommends maintaining a data inventory sheet to facilitate locating data block numbers. Additional data manipulation features Plot Data and Skip Flag are explained in the individual field program and plot manuals. Option 2 – Output Field Data Options 2 and 3 of the Field Data Main Menu output the data through the serial or parallel ports.
Page 104 Option 4 – Input Field Data Block(s) For training or demonstration purposes, additional data can be appended to the Field Data Cache. 1. Connect the GDP-32 serial port to an external computer with a serial cable. NOTE: The first data block number should be equal to the number of data blocks to receive.
Page 105 GDP-32 INSTRUCTION MANUAL DATA MODE MAIN MENU From the Field Data Main Menu, press to access the Data Mode Main Menu. Escape The following tasks are initiated from the GDP32II320 Main Menu Current: Field Data Remaining:3388KB Data Mode Main Menu:...
Page 106: Accessing Caches
DATA, FILE AND PROGRAM TRANSFER ACCESSING CACHES To access data caches from the Data Mode Main Menu press , Access Cache. This displays the list of available caches: Field Data Data Storage Freq Domain Cal RPIP / CSAMT Board Calibrations Time Domain Cal TDIP / TEM Board Calibrations Antenna Cal...
Page 107 GDP-32 INSTRUCTION MANUAL ACCESSING FIELD DATA Option 1 of the Access Cache Menu re-enters the Field Data Main Menu. (See Field Data Main Menu, page 3.) ACCESSING BOARD CALIBRATION CACHES For board calibration data, select option 2, 3, 5 or 7 from the Access Cache Menu. This accesses the corresponding Board Calibration Cache Menu.
Page 108 They must be output from the antenna calibrate cache. See Section 7.6 for outputting data. Inputting Antenna Calibrations is common method of inputting calibration values into the receiver's memory. Magnetic antenna calibrations are supplied by Zonge Engineering for inputting into the GDP-32 . See Section 7.7 for instructions.
Page 109: Initializing Caches
GDP-32 INSTRUCTION MANUAL INITIALIZING CACHES Initializing is used for erasing or modifying the contents of memory. This option is primarily used after all data in the cache is transferred to an external computer. CAUTION: Once a cache is initialized, data cannot be recalled. Read the menu instructions carefully.
Page 110: Configuring Ports
SERIAL I/O PARAMETERS Option 3 of the Data Mode Main Menu sets the protocols for transferring data to a computer via the RS-232 serial port. The GDP-32 uses a standard XON, XOFF software handshake protocol. For complete information on transferring data see Section 7.6 below.
Page 111 The current port status is displayed above the Data Mode Main Menu: Parallel Port Disabled NOTE: Before the parallel port can be enabled the GDP-32 must be connected to an on-line printer via the parallel port.
Page 112: Outputting Data
Before outputting data, be sure to check the Serial Port configuration (see Section 7.5 above) 1. Attach the Serial I/O Cable between the serial port of the GDP-32 and the serial port connector on your computer.
Page 113 14. Check the new file for garbled or missing data before assuming that this process is complete. Verification consists of noting the number of data blocks in the GDP-32 verifying that all blocks are transferred to the computer, and verifying that all blocks are readable, complete, and have a standard format.
Page 114 1. Turn OFF the GDP. 2. Connect the GDP-32 to the LAN using the multi-function interface cable. NOTE: This is a special cable supplied by Zonge Engineering (P/N: GDP-32/2- ACC). 3. Start the GDP and get into Windows. 4. The GDP-32II is configured by default to have no password. It is also set to obtain its IP address automatically.
Page 115: Input Antenna Calibration Data
CSAMT CR/HACSAMT AMT/MT The procedure to load the file is as follows. Please note that the order is important. 1. Connect the serial port cable from an external computer to the GDP-32 serial port. 2. Press to enter Data Mode in the GDP-32 3.
Page 116 DATA, FILE AND PROGRAM TRANSFER NAMING ANTENNA CALIBRATIONS Antenna numbers are comprised of two parts – the antenna serial number and the antenna or calibration type: NNNC antenna serial number channel number, antenna type, or calibration type. Values for C: Reserved for ANT/1 CSAMT antennas Reserved for dual axis AA antennas: 1 = channel 1, 2 = channel 2 Reserved for AMT/CSAMT antennas, ANT/3...
Page 117 1. Turn OFF the GDP. 2. Connect the GDP-32 to the network using the multi-function interface cable. NOTE: This special cable is supplied by Zonge Engineering (P/N: GDP-32/2-ACC). 3. Start the GDP and get into Windows. 4. The GDP-32 is configured by default with no network password. It is also set to obtain its IP address automatically.
Page 118: Connecting The Gdp-32 Ii To A Laptop Via Network
NOTE: This special cable is supplied by Zonge Engineering (P/N: GDP-32/2-ACC). 3. Use a CROSSOVER cable to connect the laptop to the GDP-32 4. The GDP-32 is configured by default with no network password. It is also set to obtain its IP address automatically.
Page 119 8. RESISTIVITY-PHASE INDUCED-POLARIZATION PROGRAM (RPIP) 8.1 INTRODUCTION............. 2 ..............2 ROGRAM ESCRIPTION ................2 REQUENCY ANGE ....................2 ILTER ................2 ALIBRATION ACHE ....................2 HASE 8.2 PROGRAM OPERATION ..........3 1 - I ..........3 CREEN NITIAL ROGRAM CREEN 2 - O ........5 CREEN PERATOR NFORMATION CREEN 3 - C...
Page 120: Introduction
GDP-32 INSTRUCTION MANUAL INTRODUCTION PROGRAM DESCRIPTION The Resistivity-Phase Induced Polarization (RPIP) program is an enhanced frequency domain program using synchronous stacking, averaging, and Fourier integration to improve signal to noise ratio. Refer to Section 6 – Receiver Setup for information concerning calibration, synchronization, generic screens and field parameters for all survey programs.
Page 121: Program Operation
RPIP PROGRAM 8.2 PROGRAM OPERATION Field Survey programs operate using several parameter entry screens. Press to move to Enter the next screen or to return to the previous screen. Escape For a complete description of each screen and generic fields refer to Section 5 – Accessing Programs.
Page 122 GDP-32 INSTRUCTION MANUAL Array Type SELECT UP SELECT DN Select one of the seven array types using the keys: Home Dipole-Dipole Pole-Dipole Schlumberger Gradient Pole-Pole Downhole Core Sample arrays are chosen, then two additional lines, Gradient Schlumberger appear in the menu. These are the transmitter current...
Page 123: Screen 2 - Operator Information Screen
RPIP PROGRAM SCREEN 2 - OPERATOR INFORMATION SCREEN Select a parameter or fill in the appropriate information each user programmable fields as described in Section 5 – Accessing Programs. 0192 RPIP0613 11.7 08 Jan 18 10:17:44 array is selected, the Y- GRADIENT OPER dbf TX ID 1234...
Page 124: Screen 4 - Data Acquisition Screen
Measuring Contact Resistance Reviewing Data Refer to Section 5 – Accessing Programs for more information on Survey Program Screen. Refer to Section 6 – Receiver Setup for information on setting up the GDP-32 receiver prior to gathering data. 0207 RPIP0613 11.7 08 Jan 18 13:47:24...
Page 125: Data Collection
RPIP PROGRAM 8.3 DATA COLLECTION Begin collecting data after setting up the receiver for an RPIP field survey. For complete information on receiver setup see Section 6. To begin, press from the Data Acquisition Enter Screen. DATA COLLECTION EXAMPLE The following example displays the screens and results of an RPIP Dipole - Dipole Field Survey. For this example the field parameters are set as follows: Initial Program Screen Survey type...
Page 126 GDP-32 INSTRUCTION MANUAL The Data Acquisition Screen below is displayed when: Channels 1 and 2 are turned ON. The battery voltage has been measured and the A/D converter automatically calibrated before each measurement cycle. Gains are set automatically (default). 0207 RPIP0613 11.7 08 Jan 18 13:47:24...
Page 127 RPIP PROGRAM Upon pressing , the program acquires four cycles of data for all enabled channels Enter (unless the key is pressed before completion) and the results will look similar to Escape the following for the real-time displays (while data are being acquired). 0207 RPIP0613 11.7 08 Jan 18 13:47:49 Survey D-D...
Page 128 GDP-32 INSTRUCTION MANUAL After the selected number of cycles have been acquired (or is pressed), the final Escape display appears: 0207 RPIP0613 11.7 08 Jan 18 13:50:16 Survey D-D Stacks 1/ 1 1 Rx 3 N OUT .125 Hz 4 Cycles Tx Curr φ...
Page 129 RPIP PROGRAM Upon pressing to save the data (or to discard the data), the screen Enter Escape appears as follows. The only difference in screens is the change in last block number (0095) and the bottom command line. 0208 RPIP0613 11.7 08 Jan 18 13:58:31 Survey D-D Stacks 1/ 1...
Page 130: Viewing Data
GDP-32 INSTRUCTION MANUAL VIEWING DATA Press to display the last stack. The data display is in the following format: The SEM, SP and contact resistance values have been saved, but are off the screen to the right. To view these numbers press several times.
Page 131: Sample Data Blocks
RPIP PROGRAM SAMPLE DATA BLOCKS Data are exported to a computer in the following format: These data were acquired using an RC network and a constant current laboratory transmitter. Program Data Header Dipole-Dipole array used Card status: Passed or Failed 0003 QC test TDIP0528...
Page 132: Field Configurations
Common mode effects are caused by lack of a reference voltage or level (floating ground), or a reference level that exceeds common mode limits of the input amplifiers. The maximum permissible common mode level for the standard configuration of the GDP-32 ±10 volts. With isolation amplifiers, this level can extend to several thousand volts, but the tradeoff is higher noise and lower overall frequency response.
Page 133: Receiver Setup
Electrodes PPE / 1 Wires from BR12W or BR12WR Signal Input through IO 32/8 meter/connection panel CASE GND, COM ANALOG I/O Side panel GDP-32 Geophysical Data Processor GDP-32 Porous Pot Reference Electrode Electrode PPE/1 Section 8, Page 15 January 2003...
Page 134: Receiver Setup Using The Roll-Along Cable
GDP-32 INSTRUCTION MANUAL RECEIVER SETUP USING THE ROLL-ALONG CABLE Receiver Setup for Resistivity, Time Domain IP, Resistivity / Phase IP, and Non-Reference Complex Resistivity Using the Roll-Along Cable Connectors IPX XXX Cable Section Takeout Porous Pot Electrode PPE / 1...
Page 135: Transmitter Setup
RPIP PROGRAM TRANSMITTER SETUP Tx Setup for Time Domain IP, Resistivity/Phase, and non-Reference CR VR-CN/6 Cable Voltage Regulator VR-1 Motor Generator ETS-9/40 ZMG-30 Switch Box GGT-30-PW ETS-IN/40 Cable XMT-32-CN/6 Cable Wire from Transmitter BRI2W or Controller PR/IW with PWI XMT-32 Aluminum foil or stake electrodes Section 8, Page 17...
Page 136: Full Reference Calibration
GDP-32 INSTRUCTION MANUAL FULL REFERENCE CALIBRATION CRIP Full Reference Calibration Wiring Diagram Breast Reels Communication wire GDP-32 I/O-16 Input/Output panel CHANNEL Output Output Case Ground Ground Channel 4 Transmitter I/O CASE GND CONTRAST " CAL- < > SPACE Battery Charge...
Page 137 9. TIME DOMAIN INDUCED POLARIZATION PROGRAM (TDIP) 9.1 INTRODUCTION............... 2 ..................2 ROGRAM ESCRIPTION ..................2 REQUENCY ANGE ......................2 ILTER ..................2 ALIBRATION ACHE 9.2 PROGRAM OPERATION ............3 1 - I ............3 CREEN NITIAL ROGRAM CREEN 2 - O ..........6 CREEN PERATOR NFORMATION CREEN 3 - C...
Page 138: Introduction
GDP-32 INSTRUCTION MANUAL INTRODUCTION PROGRAM DESCRIPTION The Time Domain Induced Polarization (TDIP) program uses cross-correlation methods to lock on to the transmitted signal when operating in the asynchronous mode, and standard phase-lock stacking and averaging for the synchronous mode. Refer to Section 6 – Receiver Setup for information concerning calibration, synchronization and generic screens and field parameters of all Survey Programs.
Page 139: Program Operation
TIME DOMAIN INDUCED POLARIZATION (TDIP) PROGRAM OPERATION Field Survey programs operate using several parameter entry screens. Press to move to Enter the next screen or to return to the previous screen. Escape For a complete description of each screen and generic fields refer to Section 5 – Accessing Programs.
Page 140 GDP-32 INSTRUCTION MANUAL Select or enter a parameter for each user programmable field. User programmable fields unique to TDIP are: Array Type SELECT UP SELECT DN Select one of the seven array types using the keys: Home Dipole-Dipole Pole-Dipole Schlumberger...
Page 141 GDP-32 .) This data acquisition method provides the best data quality under varied conditions. - This asynchronous mode is available for operators with a GDP-32 Non-ZERO Tx using a non-ZERO transmitter. This program first finds the frequency of the transmitter and locks on to the signal.
Page 142: Screen 2 - Operator Information Screen
GDP-32 INSTRUCTION MANUAL SCREEN 2 - OPERATOR INFORMATION SCREEN Select a parameter or fill in the appropriate information each user programmable fields as described in Section 5 – Accessing Programs. 0210 TDIP0613 11.8 08 Jan 18 15:04:01 If Gradient array is selected, the Y-...
Page 143: Screen 4 - Data Acquisition Screen
Measuring Contact Resistance Reviewing Data Refer to Section 5 – Accessing Programs for more information on Survey Program Screen. Refer to Section 6 – Receiver Setup for information on setting up the GDP-32 receiver prior to gathering data. Section 9, Page 7...
Page 144: Data Collection
GDP-32 INSTRUCTION MANUAL DATA COLLECTION After setting up the receiver for a TDIP Field Survey, press from the Data Acquisition Enter Screen to begin collecting data. For complete information on receiver setup see Section 6. DATA COLLECTION EXAMPLE The following example displays the screens and results of a TDIP Dipole - Dipole Field Survey.
Page 145 TIME DOMAIN INDUCED POLARIZATION (TDIP) This Data Acquisition Screen is displayed when: Channels 1 and 2 are turned ON. The battery voltage has been measured and the A/D converter automatically calibrated before each measurement cycle Gains are set automatically (default) 0210 TDIP0613 11.7 08 Jan 18 15:04:21 Survey D-D...
Page 146 GDP-32 INSTRUCTION MANUAL Upon pressing , the program acquires four cycles of data for all enabled channels (unless Enter key is pressed before completion) and the results will look similar to the following Escape for the real-time displays (while data are being acquired).
Page 147 TIME DOMAIN INDUCED POLARIZATION (TDIP) After the selected number of cycles have been acquired (or is pressed), the final display Escape appears: 0198 TDIP0613 11.7 08 Jan 18 11:36:42 Survey D-D Stacks 1/ 1 1 Rx 3 N OUT Isys 1 Hz 4 Cycles Tx Curr GGGA...
Page 148 GDP-32 INSTRUCTION MANUAL Upon pressing to save the data (or to discard the data), the screen appears as Enter Escape follows. The only difference in screens is the change in last block number (0095) and the bottom command line. 0212 TDIP0613 11.7 08 Jan 18 15:08:59...
Page 149: Viewing Data
TIME DOMAIN INDUCED POLARIZATION (TDIP) VIEWING DATA Press to display the last stack. The data display is in the following format: Block: 0212 Total: 0212 TDIP0613 2000-01-18 13:50:31 11.7v D-D 26.7% 30.0DegC 1 Rx 3 N OUT .125 Hz 4 Cycles Tx Curr rho GGGA 1 ON 0.9999...
Page 150 GDP-32 INSTRUCTION MANUAL Data Acquisition Options - Press to access the routines to plot decay curves. Plot Data - Pressing places an ' ' between the version number and the date in the Skip Flag header for the block being viewed. This flag is recognized by the plot routines and the flagged data is skipped when averaging multiple blocks for plotting.
Page 151: Sample Data Blocks
TIME DOMAIN INDUCED POLARIZATION (TDIP) SAMPLE DATA BLOCKS Data are exported to a computer in the following format: Program Data Header Dipole-Dipole array used Card status: Passed or Failed 0003 QC test TDIP0528 94-03-15 14:44:02 12.6v OPER TX ID 1 A-SP 100.0 Gain factors 91001...
Page 152 GDP-32 INSTRUCTION MANUAL These data were acquired using an RC network and a constant current laboratory transmitter. The RC network is as follows: 50 K 1 uF 50 K Block 0003 is the Program Data Header. A new Program Data Header is written to the data cache whenever the operator returns to the Operation Information Screen.
Page 153: Algorithms
T/1024 is , the digitization interval The following formula for M is used for the approximation of the Zonge Standard at 0.125 Hz (8 second period): M = (1.87 x 19 x 8) x (W4 + W5 + W6 + W7) / (1024 x 10) For frequencies up to and including 0.5 Hz (2 second period), 1024 points are sampled per cycle...
Page 154: Time Domain Window Timing Information
GDP-32 INSTRUCTION MANUAL TIME DOMAIN WINDOW TIMING INFORMATION 1024 1024 points per waveform at all frequencies turns 64 points Window 1 Window 2 averaged points 19 points 19 points for Vp skipped averaged averaged 58 points 83 points o thru 57...
Page 155: Field Configurations
The maximum permissible common mode levels for the standard configuration of the GDP-32 is 10 volts. With isolation amplifiers, this level can extend to several thousand volts, but the tradeoff is higher noise and lower overall frequency response.
Page 156: Receiver Setup
GDP-32 INSTRUCTION MANUAL RECEIVER SETUP Receiver Setup for Resistivity, Time Domain IP, Resistivity / Phase IP, and Non-Reference Complex Resistivity Porous Pot Electrodes PPE / 1 Wires from BR12W or BR12WR Signal Input through IO 32/8 meter/connection panel CASE GND, COM...
Page 157: Receiver Setup Using The Roll-Along Cable
IPC 50 = 50 m IPC 100 = 100 m etc. IPC/GDP Cable using channels 1 through 6 CASE GND, COM ANALOG I/O Side panel GDP-32 Geophysical Data Processor GDP-32 Porous Pot Reference Electrode Electrode PPE/1 Section 9, Page 21...
Page 158: Transmitter Setup
GDP-32 INSTRUCTION MANUAL TRANSMITTER SETUP Tx Setup for Time Domain IP, Resistivity/Phase, and non-Reference CR VR-CN/6 Cable Voltage Regulator VR-1 Motor Generator ETS-9/40 ZMG-30 Switch Box GGT-30-PW ETS-IN/40 Cable XMT-32-CN/6 Cable Wire from Transmitter BRI2W or Controller PR/IW with PWI...
Page 159 10. COMPLEX RESISTIVITY & HACSAMT PROGRAM 10.1 INTRODUCTION..............2 10.2 CR PROGRAM OPERATION..........3 10.3 GATHERING DATA............. 10 10.4 A NOTE ON PHASE ............. 16 10.5 A NOTE ON SCALING ............16 10.6 3-POINT DECOUPLING............17 10.7 SAMPLE DATA BLOCKS ........... 18 10.8 NOTES ON FIELD CONFIGURATIONS......
Page 160: Introduction
GDP-32 INSTRUCTION MANUAL 10.1 INTRODUCTION This Fourier transform based program forms the basic complex resistivity (CR) program for field and laboratory multifrequency IP measurements, and can also be used for harmonic CSAMT, frequency EM, MMR, and other programs using magnetic field sensors. This is an enhanced program using synchronous stacking and averaging, in addition to Fourier transform methods to improve the signal to noise ratio.
Page 161: Cr Program Operation
COMPLEX RESISTIVITY & HACSAMT PROGRAM 10.2 CR PROGRAM OPERATION MENU 1: In all of the following menu descriptions, the bold fields in the boxes are the parameters that can be changed by the operator. CR 0535 15 Mar 98 08:53:40 Survey type: Reference CR Array type: Gradient Shunt:...
Page 162 GDP-32 INSTRUCTION MANUAL We will use the Reference CR mode as the example of how to set up the receiver with the various menus in the following pages. SELECT UP SELECT DN type. Six types of arrays are selectable with the...
Page 163 COMPLEX RESISTIVITY & HACSAMT PROGRAM MENU 2: function key is active. By pressing the function key you can temporarily exit the data taking routine and look at data in the field data cache. See Section 7 GDP for more details. User defined identification number.
Page 164 GDP-32 INSTRUCTION MANUAL MENU 3: The following example is the setup for a 6-channel (N = 1 through N = 6) CR survey. 0094 CR 0535 15 Mar 98 08:53:50 OPERATOR 1 TX ID 1 A-SP JOB 89001 LINE 1.0 N...
Page 165 COMPLEX RESISTIVITY & HACSAMT PROGRAM MENU 4 Upon pressing after the parameters are set up in Menu 3 the following screen will be Enter displayed. This is a combination of Menu 3 and Menu 4. 0094 CR 0535 12.3 15 Mar 98 08:57:59 We have selected the Dipole-Dipole Survey D-D 1 Rx...
Page 166 GDP-32 INSTRUCTION MANUAL OUT. Powerline notch filter switch. You have two or three possible selections here, depending upon the configuration of your receiver. For this example, we have three options SELECT UP SELECT DN since we have both 50 and 60 Hz notch filters installed. Use to change.
Page 167 COMPLEX RESISTIVITY & HACSAMT PROGRAM Press this key to enter the automatic or manual gain setting and SP buckout routines. See Section 6.5 for more details. Pressing this key will automatically buck out any self-potential (SP) or amplifier offset, for any channel that is turned on. Press this key to enter the contact resistance measuring routine.
Page 168: Gathering Data
GDP-32 INSTRUCTION MANUAL 10.3 GATHERING DATA Upon pressing after the parameters are set up in Menu 4 the following screen display is Enter an example of what you will see with a signal connected to channels 1 through 7. The battery voltage is measured and the A/D converter is automatically calibrated before each measurement cycle.
Page 169 COMPLEX RESISTIVITY & HACSAMT PROGRAM Upon pressing , the program will acquire four cycles of data for all enabled channels Enter (unless the key is pressed before completion) and the results will look similar to the Escape following for the real-time displays (while data are being acquired). 0094 CR 0535 12.3 15 Mar 98 09:05:10 Survey D-D...
Page 170 GDP-32 INSTRUCTION MANUAL After the selected number of cycles have been acquired (or is pressed), the final display Escape will appear as follows: 0094 CR 0535 12.3 15 Mar 98 09:11:15 Survey D-D 1 Rx 3 N OUT .125 Hz 4 Cycles Tx Curr 3PTφ...
Page 171 COMPLEX RESISTIVITY & HACSAMT PROGRAM NOTES: 1. The Tx Curr has been changed to 0.56 amps, which was calculated from the voltage Ω input on the Ref channel with a 0.1 shunt value. This current is the square-wave equivalent current or what the operator would read off of the transmitter current display. 2.
Page 172 GDP-32 INSTRUCTION MANUAL To view all of the data, including the harmonic data, you must press the function key. It will display the last stack taken and stored. See Section 7 for explanations. The data display is in the following format: Block: 0095 Total:0095 CR 0535 98-03-15 09:13:17 12.3v D-D...
Page 173 COMPLEX RESISTIVITY & HACSAMT PROGRAM An example of the complete CR data set stored in the data cache follows. For viewing, it is divided into two or more screens both vertically and horizontally: SEM's Block: 0095 Total:0095 SP in millivolts CR 0535 98-03-15 09:13:17 12.3v D-D 24.7% 32.2 DegC 1 Rx...
Page 174: A Note On Phase
CR program is now used for CSAMT, FEM and MMR, as well as CR, the sign of the phase had to be made consistent with other programs. Positive IP responses will now have a negative phase value, just like the RPIP program. Please contact Zonge Engineering if this causes problems with your in-house data reduction programs.
Page 175: 3-Point Decoupling
COMPLEX RESISTIVITY & HACSAMT PROGRAM 10.6 3-POINT DECOUPLING When operating in low resistivity environments with large dipole spacings, as is common with dipole-dipole or pole-dipole surveys, electromagnetic coupling is often an overwhelming factor in IP measurements. The Complex Resistivity (CR) program provides for automatic removal of electromagnetic effects by using a 3-Point decoupling algorithm, which assumes that the IP effect at very low frequencies is relatively independent of frequency.
Page 176: Sample Data Blocks
GDP-32 INSTRUCTION MANUAL 10.7 SAMPLE DATA BLOCKS SHOWING DIFFERENCE BETWEEN REFERENCE AND NON-REFERENCE (HARMONIC RP/IP) OPERATION Dipole-Dipole array used 0005 CR 0535 98-11-03 14:44:02 12.6v D-D Card status:Passed or Failed QC test OPER 1 TX ID 1 A-SP 100 Sh 0.100 JOB 89001 LINE 1.0 N...
Page 177 COMPLEX RESISTIVITY & HACSAMT PROGRAM These data were acquired using an RC network and a constant current laboratory transmitter. The RC network is as follows: 50 K 1 uF 50 K Block 0005 is the program header and is written to the data cache only when the operator goes between Menu 2 and 3.
Page 178: Notes On Field Configurations
(floating ground), or a reference level that exceeds common mode limits of the input amplifiers. are ±10 volts. With Common mode levels for the standard configuration of the GDP-32 external isolation amplifiers, this level can be extended to several thousand volts, but in exchange one has to contend with higher noise and a lower overall frequency response.
Page 179: Sample Menus For "Labrox" Option
COMPLEX RESISTIVITY & HACSAMT PROGRAM 10.9 SAMPLE MENUS FOR "LABROX" OPTION MENU 1: CR 0535 15 Mar 98 08:53:40 Survey type: LABROX Array type: Core Sample is the value of the current Shunt Shunt: 100.0 KΩ measuring resistor (in the decade resistance Gain Mode: Noisy Units: Meters box - see the diagrams at the end of this...
Page 180 GDP-32 INSTRUCTION MANUAL MENU 3: 0094 CR 0535 15 Mar 98 08:53:50 OPERATOR 1 TX ID 1 A-SP JOB 89001 LINE 1.0 N SPREAD 1 Channels 1 and 2 are automatically set as N/Ant shown. Channel 1 (Ex) is the voltage...
Page 181 COMPLEX RESISTIVITY & HACSAMT PROGRAM L/A. By pressing the following menu appears: 0094 CR 0535 12.3 15 Mar 98 08:57:59 Survey LAB 1 Rx 3 N OUT 1 Cycle Tx Curr 1.0µ µ µ µ 1 Hz Length: 1.0 cm Area: 1.0 cm squared Shunt 100.0 KΩ...
Page 182: Sample Menus For "Hacsamt" Option
GDP-32 INSTRUCTION MANUAL 10.10 SAMPLE MENUS FOR "HACSAMT" OPTION MENU 1: CSHA 0535 15 Mar 98 08:53:40 Survey type: HA CSAMT Array type: AMT Gain Mode: Noisy Units: Feet Moving Average Filter: Enabled CONTINUE: Next menu, ESCAPE: Prev. menu MENU 2:...
Page 183 COMPLEX RESISTIVITY & HACSAMT PROGRAM MENU 3: The following example is the setup for a 6 E-field and 1 H-field harmonic CSAMT survey 0094 CSHA 0535 15 Mar 98 08:53:50 OPER 1 TX ID 1 A-SP JOB 89001 LINE 1.0 N SPREAD 1 Sta/Ant 1 Ex...
Page 184: Field Configurations
GDP-32 INSTRUCTION MANUAL 10.11 FIELD CONFIGURATIONS GDP SETUP: RESISTIVITY, TDIP, RPIP, NRCR Porous Pot Electrodes PPE / 1 Wires from BR12W or BR12WR Signal Input through IO 32/8 meter/connection panel CASE GND, COM ANALOG I/O Side panel GDP-32 Geophysical Data Processor...
Page 185: Gdp Setup With Roll-Along Cable: Resistivity, Tdip, Rpip, Nrcr
COMPLEX RESISTIVITY & HACSAMT PROGRAM GDP SETUP WITH ROLL-ALONG CABLE: RESISTIVITY, TDIP, RPIP, NRCR Section 10, Page 27 January 2003...
Page 186: Transmitter Setup: Tdip, Rpip, Non-Reference Cr
GDP-32 INSTRUCTION MANUAL TRANSMITTER SETUP: TDIP, RPIP, NON-REFERENCE CR VR-CN/6 Cable Voltage Regulator VR-1 Motor Generator ETS-9/40 ZMG-30 Switch Box GGT-30-PW ETS-IN/40 Cable XMT-32-CN/6 Cable Wire from Transmitter BRI2W or Controller PR/IW with PWI XMT-32 Aluminum foil or stake electrodes...
Page 187: Transmitter Setup With Current Reference
COMPLEX RESISTIVITY & HACSAMT PROGRAM TRANSMITTER SETUP WITH CURRENT REFERENCE VR-CN/6 Cable Breast Reel BRW2IC Voltage Regulator To GDP-32 VR-I ISO / I - IN / 3 Cable Iso Amp ISO/I Motor Generator ISO/I-IN ZMG-30 ETS-IN/40 ETS-9/40 Switch Box Transmitter...
Page 188: Complex Resistivity Receiver Setup With Current Reference
GDP-32 INSTRUCTION MANUAL COMPLEX RESISTIVITY RECEIVER SETUP WITH CURRENT REFERENCE Porous Pot Electrodes PPE / 1 Wires from BR12W REF-IN or BR12WR Signal Input through IO 32/8 meter / connection panel CASE GND, COM ANALOG I/O Side panel GDP-32 Geophysical Data Processor...
Page 189: Full Reference Calibration
COMPLEX RESISTIVITY & HACSAMT PROGRAM FULL REFERENCE CALIBRATION CRIP Full Reference Calibration Wiring Diagram Breast Reels Communication wire GDP-32 I/O-16 Input/Output panel CHANNEL Output Output Case Ground Ground Channel 4 Transmitter I/O CASE GND CONTRAST " CAL- < > SPACE...
Page 190: Laboratory Rock Measurement Setup
GDP-32 INSTRUCTION MANUAL LABORATORY ROCK MEASUREMENT SETUP LABORATORY ROCK MEASUREMENT SETUP Basic Circuit Note: Lab Tx ISO/1 Preamplifiers may be used at Decade Rock points labeled A & B. Channel 2 Channel 1 Transmitter I/O Common Channel 2 Channel 1...
Page 191: Alternate Laboratory Rock Measurement Setup
COMPLEX RESISTIVITY & HACSAMT PROGRAM ALTERNATE LABORATORY ROCK MEASUREMENT SETUP ALTERNATE LABORATORY ROCK MEASUREMENT SETUP Basic Circuit Current monitor shunt values: Lab Tx .001 - .01 mA 100K ohm LDT-10 current .01 - .1 mA 10K ohm monitor Rock .1 - 1 mA 1K ohm 1 - 10 mA 100 ohm Channel 2 Channel 1...
Page 192 11. CONTROLLED-SOURCE AUDIO-FREQUENCY MAGNETOTELLURICS 11.1 INTRODUCTION ..............2 11.2 FIXED FUNCTION KEYS ............. 3 11.3 CSAMT PROGRAM OPERATION ........4 11.4 GATHERING DATA ............. 11 11.5 A NOTE ON VARIABLE A-SPACING ......16 11.6 A NOTE ON PHASE.............. 16 11.7 A NOTE ON SCALING............16 11.8 RESTRICTIONS ..............
Page 193 GDP-32 INSTRUCTION MANUAL 11.1 INTRODUCTION Controlled Source Audio-frequency Magnetotellurics or CSAMT is an enhanced frequency domain EM program using synchronous stacking and averaging, and Fourier integral methods to improve the signal to noise ratio. The standard frequency range of the CSAMT program is 0.015625 (1/64) to 8192 Hz.
Page 194: Fixed Function Keys
CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 11.2 FIXED FUNCTION KEYS One of the differences between the GDP-32 and its predecessor, the GDP-32, is the addition of six fixed function keys located below the six soft function keys ( through ) at the bottom edge of the LCD.
Page 195: Csamt Program Operation
GDP-32 INSTRUCTION MANUAL 11.3 CSAMT PROGRAM OPERATION MENU 1: In all of the following menu descriptions, the in the boxes are the parameters bold fields that can be changed by the operator. CSAMT 0537 15 Mar 98 08:53:10 Grounded E field...
Page 196 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS MENU 2: CSAMT 0537 15 Mar 98 08:53:40 OPER JOHN.DOE TX ID Z-30 A-SP JOB 94007 LINE AJO ROAD N SPREAD 1 CONTINUE: Next menu, ESCAPE: Prev. menu key is active. User defined identification. Alphanumerics permitted. OPER.
Page 197 GDP-32 INSTRUCTION MANUAL MENU 3: The following example is for a single station vector setup - two E-fields and three H-fields. 0097 CSAMT 0537 15 Mar 98 08:53:47 OPER JOHN.DOE TX ID Z-30 A-SP JOB 94007 LINE AJO ROAD N SPREAD 1...
Page 198 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS Antenna Data is the antenna designator or serial number. is the channel number or NNNC NNN antenna type. For example: Two channel ANT/2, serial number 14, using channel 1 of two channels. Two channel ANT/2, serial number 14, using channel 2 of two channels. Single channel ANT/1, serial number 5.
Page 199 GDP-32 INSTRUCTION MANUAL MENU 3B 0097 CSAMT 0537 15 Mar 98 08:53:47 OPER JOHN DOE TX ID Z-30 A-SP JOB 94007 LINE AJO ROAD N SPREAD 1 External Amp External Amp 1 Ex 9 OFF 2 Hy 10 OFF 3 Ey...
Page 200 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS MENU 4: Upon pressing after the parameters are set up in Menu 3, the following screen will be Enter displayed. This is a combination of Menu 3 and Menu 4. 0097 CSAMT 0537 12.3 15 Mar 98 08:57:49 We have selected Grounded E-field Survey Grounded array...
Page 201 GDP-32 INSTRUCTION MANUAL - All notch filters bypassed. - 60 and 180 Hz notch filters enabled. - 60, 180, 300 and 540 Hz notch filters enabled. 60,5 Other standard selections are: - 50 and 150 Hz notch filters enabled. - 50, 150, 250 and 450 Hz notch filters enabled.
Page 202: Gathering Data
CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 11.4 GATHERING DATA Upon pressing after the parameters are set up in Menu 4 the following screen display is Enter an example of what you will see with a signal connected to channels 1 through 5. The battery voltage is measured and the A/D converter is automatically calibrated before each measurement cycle.
Page 203 GDP-32 INSTRUCTION MANUAL After the selected number of cycles have been acquired (or is pressed), the final display Escape will be one of the following: Display "A" 0097 CSAMT 0537 12.3 15 Mar 98 09:11:15 Survey Grounded 1 Rx 3 N OUT...
Page 204 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS By pressing (under the label), the following is displayed: Display "B" 0097 CSAMT 0537 12.3 15 Mar 98 09:11:15 Survey Grounded 1 Rx 3 N OUT 1 Hz 4 Cycles Tx Curr rho E φ φ φ φ - H φ φ φ φ Sta/Ant SEM GGGA 1 Ex...
Page 205 GDP-32 INSTRUCTION MANUAL NOTE: The data format is changed when the data are placed in the data cache. To obtain E - H phase for measurements which use more than one E-field for each H-field, you must manually subtract the H-field phase from the appropriate E-field phase.
Page 206 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS If you want to view the stored data, press the key. It will display the last stack taken. See Section 7.2, Viewing Data for an explanation of the data mode. The data display is in the following format: Block: 0098 Total:0098 CSAM0537 98-03-15 09:13:17 12.3v AMT...
Page 207: A Note On Variable A-Spacing
GDP-32 INSTRUCTION MANUAL 11.5 A NOTE ON VARIABLE A-SPACING When using variable A-Spacings, the key to getting the correct A-Spacing entered and used, is to remember two things: 1) the last field changed controls the A-Spacing value that is used, and 2) the A-Spacing that is used is ALWAYS the value in the Variable A-Spacing list.
Page 208: Restrictions
CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 11.8 RESTRICTIONS The only restrictions on setting up the channels and using this program are to make sure the E- field channels always precede the corresponding H-field channels. In calculating Cagniard resistivities, the program first looks for an E-field channel, and then matches it up with the first orthogonal H-field channel that it finds when going down the channel list.
Page 209 GDP-32 INSTRUCTION MANUAL 2. Four station scalar measurements, stations 1, 2, 3, and 4: Data displayed on LCD after acquisition: φ φ φ φ φ φ φ φ Sta/Ant SEM GGGA φ φ φ φ RHOxy 1 Station 1 φ φ φ φ...
Page 210 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 3. Two station vector measurements: Data displayed on LCD after acquisition: φ φ φ φ φ φ φ φ Sta/Ant SEM GGGA φ φ φ φ RHOxy 1 Station 1 φ φ φ φ RHOyx -Hx1 φ...
Page 211 GDP-32 INSTRUCTION MANUAL 4. Single station tensor measurements: Data displayed on LCD after acquisition: N OUT 16 Hz 256 Cycles Tx Curr φ φ φ φ φ φ φ φ Sta/Ant SEM GGGA φ φ φ φ RHOxy Data from Tx Antenna #1 φ...
Page 212 CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 11.9 SAMPLE DATA BLOCKS Grounded E-field dipole Card status: Passed or failed QC test. 0010 CSAM0537 98-03-15 14:51:55 12.6v AMT Gain factors for each card OPER 1 TX ID 1 A-SP JOB 89001 LINE 1.0 N SPREAD Analog card information DiffAmp Notch+60,3-50,3 S/N 185 Passed 1.00192...
Page 213: Notes On Field Configurations
(floating ground), or a reference level that exceeds common mode limits of the input amplifiers. Common mode levels for the standard configuration of the GDP-32 are ±10 volts. With isolation amplifiers, this level can be extended to several thousand volts, but in exchange you have to contend with higher noise and a lower overall frequency response.
Page 214: Field Configurations
Wires from BR12W or BR12WR Shield connected to Case GND Signal Input through IO 32/8 meter/connection panel CASE GND, COM ANALOG I/O Side panel GDP-32 Geophysical Data Processor GDP-32 Porous Pot Reference Electrode Electrode PPE/1 Section 11, Page 23 May 2002...
Page 215: Csamt Transmitter Setup
GDP-32 INSTRUCTION MANUAL CSAMT TRANSMITTER SETUP VR-CN/6 Cable Voltage Regulator VR-I Motor Generator ZMG-30 GGT-30-PW Cable Transmitter GGT-30 XMT-32-CN/6 Cable Wire from XMT-32 Transmitter BRI2W or Controller PR/I with PW/I Aluminum foil or stake electrodes May 2002 Section 11, Page 24...
Page 216: Magnetic Sensors Field-Check
CONTROLLED-SOURCE AUDIO FREQUENCY MAGNETOTELLURICS 11.13 MAGNETIC SENSORS FIELD-CHECK It is possible to field check the operation of an antenna by using the GDP calibrator as a signal source as follows: 1. Connect a 1 K ohm resistor between the Black and Red input terminals for channel 1. 2.
Page 217 12. TRANSIENT ELECTROMAGNETICS PROGRAM 12.1 INTRODUCTION..............2 12.2 FIXED FUNCTION KEYS ............. 3 12.3 TEM PROGRAM OPERATION ........... 4 12.4 POWERLINE NOISE REJECTION ........12 12.5 GATHERING DATA............. 13 12.6 A NOTE ON SCALING ............17 12.7 SAMPLE RATES AND ANTIALIAS FILTER DELAYS. 18 12.8 TEM WINDOW CENTERS FOR ZERO DELAY ....
Page 218 GDP-32 INSTRUCTION MANUAL 12.1 INTRODUCTION The transient electromagnetics or TEM program is a versatile electromagnetics program using standard phase-lock stacking and averaging methods for signal-to-noise enhancement. The standard frequency range (repetition rate) of the TEM program is from 0.0625 (16 second period) to 32 Hz (0.03125 second period).
Page 219: Transient Electromagnetics Program
TRANSIENT ELECTROMAGNETICS PROGRAM 12.2 FIXED FUNCTION KEYS One of the differences between the GDP-32 and its predecessor, the GDP-32, is the addition of six fixed-function keys located below the six soft function keys ( through ) at the bottom edge of the LCD.
Page 220: Tem Program Operation
TEM 0539 15 Mar 98 08:53:40 Display screen with regular analog cards Array type: In-loop installed: Duty cycle: 50% Window: Zonge Standard Receiver moment: 10000 Transmitter X, Y: 1 Turns: 1 Tx Delay 50 Antenna Delay...
Page 221 TRANSIENT ELECTROMAGNETICS PROGRAM function key is active. Program name and version. 0539. Date. 15 Mar Time. 08:53:40. This line shows up on the menu only when a high speed NanoTEM card is Program: installed, and the NanoTEM program is selected. The two selections are: Standard 30.5 µs sample time for 4 through 32 Hz rep rates ZeroTEM 1.2 or 1.6 µs sample time TEM.
Page 222 GDP-32 INSTRUCTION MANUAL Two different TEM options are accessed in Menu 1: Duty cycle. (default): bipolar 1/4 period on, 1/4 period off, standard time domain waveform. 100% Frequency domain waveform for LOTEM and experimentation. Three choices are available: Windows. Standard: logarithmic window spacings as shown in Sections 12.8 and 12.9 Zonge for TEM and Sections 12.23.1 and 12.23.2 for NanoTEM...
Page 223 TRANSIENT ELECTROMAGNETICS PROGRAM MENU 2: TEM 0539 15 Mar 98 08:53:45 OPER JOHN.DOE TX ID 1 A-SP JOB 94001 LINE 1 N SPREAD 1 CONTINUE: Next menu, ESCAPE: Prev. menu function key is active. User defined identification. Alphanumerics permitted. OPER. User defined identification.
Page 224 GDP-32 INSTRUCTION MANUAL MENU 3: For this example we will assume a 3-axis measurement at a single station. 0094 TEM 0539 15 Mar 98 08:57:47 OPER JOHN DOE TX ID 1 A-SP JOB 94001 LINE 1 N SPREAD 1 Station...
Page 225 TRANSIENT ELECTROMAGNETICS PROGRAM MENU 4: Upon pressing after the parameters are set up in Menu 3, the following screen will be Enter displayed. This is a combination of Menu 3 and Menu 4. 0094 TEM 0539 12.3 15 Mar 98 08:57:49 Survey INL We have selected the array...
Page 226 GDP-32 INSTRUCTION MANUAL Specify the number of cycles to average. Increments are in binary steps from 1 to Cycle. SELECT UP SELECT DN 16,384. Use to change. As the system acquires data, the cycle count will Home be updated in real-time to the left of the number input by the operator.
Page 227 TRANSIENT ELECTROMAGNETICS PROGRAM If the Transmitter Type is set to series, the display above will be blank, and the operator will not have control of the transmitter off/on states. Gain stages 0, 1 and 2. Initially all gain stages are set to unity gain. Upon G0, G1, pressing , the program will automatically set the gains and SP buckout if the auto-...
Page 228: Powerline Noise Rejection
GDP-32 INSTRUCTION MANUAL 12.4 POWERLINE NOISE REJECTION Field tests have demonstrated that in general the new binary crystals (4.980736 MHz) provide superior powerline noise rejection over the original 5 MHz crystals. The new crystals provide an exact binary frequency range so that stacking and averaging can be synchronous with the powerline frequencies.
Page 229: Gathering Data
TRANSIENT ELECTROMAGNETICS PROGRAM 12.5 GATHERING DATA Upon pressing after the parameters are set up in Menu 4 the following screen display is Enter an example of what you will see with a signal connected to channels 1, 2 & 3. The battery voltage is measured and the A/D converter is automatically calibrated before each measurement cycle.
Page 230 GDP-32 INSTRUCTION MANUAL Gain settings for stages 0, 1 and 2 (in powers of 2). For this example, gain stages GGGA. 0 and 2 = 2 = 1, gain stage 1 = 2 = 64 and the attenuator is locked OUT, unless enabled by the operator.
Page 231 TRANSIENT ELECTROMAGNETICS PROGRAM After the selected number of cycles have 0094 TEM 0539 12.3 15 Mar 98 08:57:49 Survey INL 1 Rx 32 Hz 128/ 128 Cycle Tx Curr been acquired (or is pressed), the Escape Window 1.549m Delay 122.1u Alias 26 u final display will appear as follows: Station...
Page 232 GDP-32 INSTRUCTION MANUAL Press the function key to view the data. It will display the last stack taken. See DATA Section 7.2, Viewing Data for explanations. The data display is in the following format: Block: 0095 Total:0095 TEM 0539 98-03-15 09:13:17 12.3v INL...
Page 233: A Note On Scaling
TRANSIENT ELECTROMAGNETICS PROGRAM Plot Data. By pressing you get into the plot routines. See Plot Routines, Section 14 for more information. Standard plots for this TEM program are transient voltage vs. time, and resistivity vs. image depth. Skip Flag. By pressing an 'x' is placed between the version number and the date in the header for the block being viewed.
Page 234: Sample Rates And Antialias Filter Delays
GDP-32 INSTRUCTION MANUAL 12.7 SAMPLE RATES AND ANTIALIAS FILTER DELAYS FREQ SAMPLE SAMP'S NYQUIST LOW PASS FILTER SAMPLE RATE /CYCLE Delay INTERVAL 26 µs 30.5 µS 32768 1024 16384 24.8 KHz 26 µs 30.5 µS 32768 2048 16384 24.8 26 µs 30.5 µS...
Page 235: Tem Window Centers For Zero Delay
TRANSIENT ELECTROMAGNETICS PROGRAM 12.8 TEM WINDOW CENTERS FOR ZERO DELAY WINDOW 32, 16, 8 .125 .0625 and 4 Hz 0.0 µs 0.0 µs 0.0 µs 0.0 µs 0.0 µs 0.0 ms 0.0 ms 30.5 61.0 122.0 244.1 488.3 976.6 1.953 61.0 122.1 244.1...
Page 236: Window Centers And Widths
GDP-32 INSTRUCTION MANUAL 12.9 WINDOW CENTERS AND WIDTHS 32, 16, 8 and 4 HZ REPETITION RATES WINDOW CENTERS WINDOW WIDTHS WINDOW POINTS 32, 16, 8 BEGINNING PER WINDOW and 4 Hz 0.0 µ sec 0.0 µ sec 0.0 µ sec 30.5...
Page 237: Sample Data Blocks
TRANSIENT ELECTROMAGNETICS PROGRAM 12.10 SAMPLE DATA BLOCKS IN-LOOP array used 0094 TEM 0539 98-03-15 08:57:47 12.3v INL OPER JOHN DOE TX ID 1 A-SP Duty Cycle JOB 94001 LINE SPREAD 50% RxM 10000 TxX 1 TxY 1 #T 1 Ref 0.113 Rx Moment Tx Delay 50 Antenna Delay...
Page 238: Field Setups And Magnetic Antennas
GDP-32 INSTRUCTION MANUAL 12.11 FIELD SETUPS AND MAGNETIC ANTENNAS The figures at the end of this TEM manual provide examples of receiver connections using the optional REFERENCE ELECTRODE or REFERENCE POT connected to both analog ground (COM) and case ground (CASE GND).
Page 239: Tem Receiver / Transmitter Arrays
TRANSIENT ELECTROMAGNETICS PROGRAM 12.13 TEM RECEIVER / TRANSMITTER ARRAYS In-Loop (INL) Coincident Loop (COL) Single or Dual Loop Fixed Loop (FXL) Moving Loop (MVL) LOTEM (LOT) Section 12, Page 23 October 2002...
Page 240: First Window Time Determination
GDP-32 INSTRUCTION MANUAL 12.14 FIRST WINDOW TIME DETERMINATION Assume for this example: Antenna delay 15 Fixed sample width = 30 µs Filter delay Current turn-off = 74 µs Total delays 39 µs Begin turn-off Current Transmitter current waveform with beginning...
Page 241: Field Configurations
FIELD CONFIGURATIONS TEM RECEIVER SETUP WITH Z-AXIS COIL TEM/3 TEM/3-OT Shield connected to ground (COM) ANALOG I/O Side panel XMT/32 - CN/6 GDP-32 Transmitter Control Geophysical Data Processor Cable to GGT or GDP-32 ZT Transmitters (optional) Porous Pot Electrode Reference...
Page 242 GDP-32 INSTRUCTION MANUAL TEM RECEIVER WITH 3-AXIS (X,Y,Z) COILS Shields connected to Analog Ground (COM) ANALOG I/O Side panel XMT/32-CN/6 GDP-32 Transmitter Control Geophysical Data Processor Cable to GGT or ZT GDP-32 Transmitters (optional) Porous Pot Electrode Reference PPE/1 Electrode...
Page 243: Zerotem Transmitter Setup (Standard)
TRANSIENT ELECTROMAGNETICS PROGRAM ZT-20 ZEROTEM TRANSMITTER SETUP (STANDARD) Loop wire from BR12W or PR / 1W with PW / 1 XMT/32 - CN/6 Cable Geophysical Data Processor GDP-32 II 12 V Batteries Transmitter ZT-20, ZT-30, or NT-20 Section 12, Page 27...
Page 244 GDP-32 INSTRUCTION MANUAL ZT-20 ZEROTEM TRANSMITTER SETUP (XMT-32) Loop wire from BR12W or PR/1W with PW/1 XMT/32 - CN/32 Cable Transmitter Controller XMT-32 12 V Batteries Transmitter ZT-20, ZT-30, or NT-20 October 2002 Section 12, Page 28...
Page 245: High-Power Tem Transmitter Setup
HIGH-POWER TEM TRANSMITTER SETUP VR-CN/6 Cable Voltage Regulator VR-1 Motor Generator ZMG-30 GGT-30-PW Cable Transmitter GGT-30 XMT/32 - CN/6 Cable (optional) XMT/32 - CN/6 Cable Wire from BR12/W or PR/1W with PW/1 To GDP-32 Section 12, Page 29 October 2002...
Page 246: Equal-Interval Mode Tem
12.16 EQUAL-INTERVAL MODE, TEM General A version of the TEM program that runs on the Zonge GDP-32 receiver permits TEM transients to be uniformly sampled and stored as time series to the hard disk. The window parameter may be toggled between...
Page 247 2. Turn on the GDP-32 and run Windows. 3. If using the LAN, you may have to re-configure the network parameters in the GDP-32 to be compatible with your network. 4. If using the serial port, HyperTerminal is the recommended program to use. You will have to ensure that the two serial ports are configured identically.
Page 248: Method To Field-Check Magnetic Sensors
GDP-32 INSTRUCTION MANUAL 12.17 METHOD TO FIELD-CHECK MAGNETIC SENSORS It is possible to field check the operation of an antenna by using the GDP calibrator as a signal source as follows: 1. Connect a 1 K ohm resistor between the input terminals.
Page 249: The Nanotem System
4 amperes. Two versions of the NanoTEM transmitter are available. The first, the NT-20, is an external transmitter system, and the second is the NT-32 that utilizes a transmitter integrated within the GDP-32 case. Operating instructions for the NT-20 transmitter are included in a separate manual included with the NT-20.
Page 250: Nanotem Hookup Directions
GDP-32 INSTRUCTION MANUAL 12.19 NANOTEM HOOKUP DIRECTIONS Using a 20 X 20 m Transmitter Loop and NT-20 or NT-32 Transmitter 1. Use the 1 K-ohm bridge that is supplied. Plug it into the input for the channel that has the NanoTEM card (channel 3 in this example), and connect the ground wire to COM.
Page 251: Transmitter System
TRANSIENT ELECTROMAGNETICS PROGRAM 12.20 NT-32 TRANSMITTER SYSTEM Setup of the NanoTEM system using the NT-32 transmitter is similar to the steps used when using all of the other Zonge Transmitter systems. TEM 0539 15 Mar 98 08:53:40 Menu 1 Program: NanoTEM Sample Rate: 1.2usec...
Page 252 GDP-32 INSTRUCTION MANUAL 0094 TEM 0539 15 Mar 98 08:57:47 Menu 3 OPER JOHN DOE TX ID 1 A-SP Menu 3, as with all of the data collection JOB 94001 LINE 1 N SPREAD 1 programs GDP-32 allows Station individual channels to be enabled, station...
Page 253 TRANSIENT ELECTROMAGNETICS PROGRAM 0094 NANOTEM 0610 12.3v 15 Mar 98 08:57:49 Gain/F10 SubMenu Survey In loop Stacks 1 Rx NT32 Battery: 12.0 V The setup menu for the NT-32 transmitter 32 Hz 128/ 128 Cycles NT32 Current: 1.1 Window 1.549m Delay 122.1u Alias can be accessed by pressing 8.
Page 254: Nanotem Turnoff Times
12.22 NANOTEM FIELD DATA CACHE At this time, all of the GDP-32 programs, except for the NanoTEM program, initialize the data cache according to the outline in Chapter 7.4. Initialize the NanoTEM data cache as follows: If you are in the NanoTEM program, get into the first menu and...
Page 255 TRANSIENT ELECTROMAGNETICS PROGRAM DOS PROCEDURE FOR NANOTEM CACHE INITIALIZATION: Press to get into DOS. The prompt will be displayed. C:\> Type: DEL NTDATA.CAC Type: and page through the files. should not be included. DIR /P NTDATA.CAC Type: MENU The LOGO screen will now be displayed. WINDOWS PROCEDURE FOR NANOTEM CACHE INITIALIZATION: Press to get into WINDOWS...
Page 256 5. Double click on the icon for NTCNVRT.EXE 6. The program will convert the file in the folder to an ASCII file NTDATA.CAC To use Zonge Engineering data processing software rename the file NTDATA.PRN. and begin the data processing with the programs SHRED.EXE and NTDATA.RAW TEMAVG.EXE.
Page 257: Nanotem Window Centers
TRANSIENT ELECTROMAGNETICS PROGRAM 12.23 NANOTEM WINDOW CENTERS SAMPLE PERIOD: 1.6 MICROSECONDS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 µ sec 0.0 µ sec 0.0 µ sec 10.4 11.2 13.6 12.8 14.5 16.8 16.1 17.7 20.8...
Page 258 GDP-32 INSTRUCTION MANUAL SAMPLE PERIOD: 1.2 MICROSECONDS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 µ sec 0.0 µ sec 0.0 µ sec 10.2 10.8 12.6 12.1 13.3 15.6 14.5 16.9 19.2 18.1 20.5...
Page 259: Sample Period: 1.2 Microseconds, Shallow Applications
TRANSIENT ELECTROMAGNETICS PROGRAM SAMPLE PERIOD: 1.2 MICROSECONDS, SHALLOW APPLICATIONS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 u sec 0.0 u sec 0.0 u sec 11.4 10.8 12.0 13.8 13.3 14.5 16.3 15.7 16.9 19.2 18.1...
Page 260: Nanotem Sample Data
GDP-32 INSTRUCTION MANUAL 12.24 NANOTEM SAMPLE DATA 0778 NANO0534 94-12-31 17:58:13 11.7v INL OPER SAU TX ID T-21 A-SP JOB 94118 LINE SPREAD 50% RxM 10000 TxX 1 TxY 1 #T 1 Ref 0.113 Tx Delay 1.5 Antenna Delay 2 Alias IN...
Page 261: The Nanotem Calibrate Box
BLACK provided with the calibrate box. 2. Plug the NT-I terminal connector (i.e., black double banana plug with single banana plug pigtail cable) into a GDP-32 input channel corresponding to a NanoTEM analog card. Plug the pigtail into the jack of the GDP-32 3.
Page 262: Nanotem Calibrate Setup
INPUT on GDP CHANNELS 1-6 2 - 1K ohm resistors in ANALOG I/O series with center tap Center NT CALIBRATE - GDP-32 Top view of plug Use this hookup for proper polarity. Date: 05-30-01 October 2002 Section 12, Page 46...
Page 263: Nanotem Calibrate Setup
TRANSIENT ELECTROMAGNETICS PROGRAM NT-32 NANOTEM CALIBRATE SETUP 60 cm twisted- pair cable NanoTEM Cal Receiver Transmitter GDP-32 10 cm jumper cables NT 32 NanoTEM Transmitter CAL+ TX OUTPUT CAL- 2 - 1K ohm resistors in CURRENT SENSE 1V/A series with...
Page 264: Nanotem Calibrator Decay Transient
GDP-32 INSTRUCTION MANUAL NANOTEM CALIBRATOR DECAY TRANSIENT A (top): 1.2 us sample interval, B (bottom): 1.6 us sample interval. October 2002 Section 12, Page 48...
Page 265: Nanotem Field Setup
INPUT on GDP CHANNELS 1-6 2 - 1K ohm resistors in ANALOG I/O series with center tap Center NT SETUP - GDP-32 Top view of plug Use this hookup for proper polarity. Date: 05-30-01 Section 12, Page 49 October 2002...
Page 266: Field Setup
GDP-32 INSTRUCTION MANUAL NT-32 FIELD SETUP October 2002 Section 12, Page 50...
Page 267: Equal-Interval Mode, Nanotem
12.27 EQUAL-INTERVAL MODE, NANOTEM General A version of the NanoTEM program that runs on the Zonge GDP-32 receiver permits NanoTEM transients to be uniformly sampled and stored as time series to the hard disk. The window parameter may be toggled between...
Page 268 2. Turn on the GDP-32 and run Windows. 3. If using the LAN, you may have to re-configure the network parameters in the GDP-32 to be compatible with your network. 4. If using the serial port, HyperTerminal is the recommended program to use. You will have to ensure that the two serial ports are configured identically.
Page 269 13. NATURAL SOURCE MAGNETOTELLURICS 13.1 INTRODUCTION ..............2 13.2 FIXED FUNCTION KEYS ............. 3 13.3 MT/AMT PROGRAM OPERATION........4 13.4 GATHERING DATA ............. 13 13.5 A NOTE ON VARIABLE A-SPACING ......17 13.6 A NOTE ON PHASE.............. 17 13.7 A NOTE ON SCALING............17 13.8 RESTRICTIONS ..............
Page 270: Amt
NATURAL SOURCE MAGNETOTELLURICS 13.1 INTRODUCTION Natural source magnetotellurics (MT) or audio-frequency magnetotellurics (AMT) is a frequency domain EM program that uses naturally occurring random noise as the signal source. This data acquisition system uses cascade decimation and stacking and averaging of Fourier transformed cross and auto-power spectra of the 6th and 8th harmonics, to obtain amplitude and phase measurements of the electric and magnetic fields.
Page 271: Fixed Function Keys
NATURAL SOURCE MAGNETOTELLURICS 13.2 FIXED FUNCTION KEYS One of the differences between the GDP-32 and its predecessor, the GDP-32, is the addition of six fixed function keys located below the six soft function keys ( through ) at the bottom edge of the LCD.
Page 272: Mt/Amt Program Operation
NATURAL SOURCE MAGNETOTELLURICS 13.3 MT/AMT PROGRAM OPERATION MENU 1: In all of the following menu descriptions, the bold fields in the boxes are the parameters that can be changed by the operator. AMT 0538 15 Mar 98 08:53:10 <— Robust processing menu for Vector AMT Remote Reference: ON Scalar and Vector only...
Page 273 Robust Processing: following parameters. This menu is displayed only for the vector mode of operation. Note: Robust processing is turned off in the GDP-32 at this time, while software modifications are being made. This is the coherency coefficient limit that can be manually Coherency Limit: .90.
Page 274 NATURAL SOURCE MAGNETOTELLURICS MENU 2: AMT 0538 15 Mar 98 08:53:40 OPER JOHN.DOE TX ID Z-30 A-SP JOB 94007 LINE AJO ROAD N SPREAD 1 CONTINUE: Next menu, ESCAPE: Prev. menu key is active. User defined identification. Alphanumerics permitted. OPER. User defined identification.
Page 275 NATURAL SOURCE MAGNETOTELLURICS MENU 3: The following example is for a single station tensor setup with remote reference. 0097 AMT 0538 15 Mar 98 08:53:47 OPER JOHN DOE TX ID Z-30 A-SP JOB 94007 LINE AJO ROAD N SPREAD 1 Sta/Ant 1 Ex 9 OFF...
Page 276 NATURAL SOURCE MAGNETOTELLURICS At this point, pressing the soft function keys in Menu 3 will result in the following: VarAsp. Pressing will put the operator in the variable A-spacing input routine as shown below: MENU 3A 0097 AMT 0538 15 Mar 98 08:53:47 OPER JOHN DOE TX ID Z-30 A-SP Ref.
Page 277 NATURAL SOURCE MAGNETOTELLURICS MENU 3C NOTE: For best results, always use an external signal conditioner with low 0097 AMT 0538 15 Mar 98 08:53:47 noise preamplifiers and frequency OPER JOHN DOE TX ID Z-30 A-SP bandwidth limiting capability, such as JOB 94007 LINE AJO ROAD N SPREAD 1 the SC-8 Signal Conditioning unit.
Page 278 NATURAL SOURCE MAGNETOTELLURICS MENU 4: Upon pressing after the channels are set up in Menu 3, the following screen will be Enter displayed: Tensor configuration selected with channels 6 and 7 used as remote reference 0097 AMT 0538 12.3 15 Mar 98 08:57:49 <–...
Page 279 NATURAL SOURCE MAGNETOTELLURICS SELECT UP SELECT DN to change. Home - All notch filters bypassed. - 60 and 180 Hz notch filters enabled. - 60, 180, 300 and 540 Hz notch filters enabled. 60,5 Other standard selections are: - 50 and 150 Hz notch filters enabled. - 50, 150, 250 and 450 Hz notch filters enabled.
Page 280 NATURAL SOURCE MAGNETOTELLURICS Sta/Ant. The Sta(tion) field (station numbers for individual E-fields) can be changed in Menu 4, but the Ant(enna) numbers are accessible only in Menu 3. In Menu 4, the cursor will skip over any channels labeled with an H-field designator. NOTE: Our standard data processing programs sort first on station number, second on Rx and third on Tx.
Page 281: Gathering Data
NATURAL SOURCE MAGNETOTELLURICS 13.4 GATHERING DATA Upon pressing after the parameters are set up in Menu 4 the following screen display is Enter an example of what you will see with a signal connected to channels 1 through 4. The battery voltage is measured and the A/D converter is automatically calibrated before each measurement cycle.
Page 282 NATURAL SOURCE MAGNETOTELLURICS DATA ACQUISITION COMPLETE now FILTERING, DECIMATING and FOURIER TRANSFORMING data: 0097 AMT 0538 12.3 15 Mar 98 09:08:02 Survey Vector AMT 1 Rx 3 N OUT .0938- 4 5 Stacks 6 Levels Point Count: 8285/ 8285 Sta/Ant G0 G1 G2 Atn GGGA 1 Ex 1 16 16 16 OUT...
Page 283 NATURAL SOURCE MAGNETOTELLURICS FINISHED TAKING DATA 0128 AMT 0538 12.3 15 Mar 98 09:15:22 was pressed): Escape Survey Vector AMT 1 Rx 3 N OUT .0938- 4 5 Stacks 6 Levels Point Count: 8285/ 8285 CC/φ φ φ φ Sta/Ant GGGA 1 Ex 1 6.2036u...
Page 284 NATURAL SOURCE MAGNETOTELLURICS If you want to view the stored data, press the key. It will display the last stack taken. See Section 7 for an explanation of the data mode. The data display is in the following format: Block: 0405 Total: 0498 Off Screen, use AMT 0538 94-03-24 09:10:11 12.1v VEC arrows to see...
Page 285: A Note On Variable A-Spacing
NATURAL SOURCE MAGNETOTELLURICS 13.5 A NOTE ON VARIABLE A-SPACING When using variable A-Spacings, the key to getting the correct A-Spacing entered and used, is to remember two things: 1) the last field changed controls the A-Spacing value that is used, and 2) the A-Spacing that is used is ALWAYS the value in the Variable A-Spacing list.
Page 286: Restrictions
NATURAL SOURCE MAGNETOTELLURICS 13.8 RESTRICTIONS The main restriction on setting up the channels and using this program is to make sure the E- field channels always precede the corresponding orthogonal H-field channels. In calculating Cagniard resistivities, the program first looks for an E-field channel, and then matches it up with the first orthogonal H-field channel that it finds when going down the channel list.
Page 287: A N Example Of Field Data
NATURAL SOURCE MAGNETOTELLURICS XAMPLE OF IELD AMT Vector array used Coherency Limit Window function 0384 AMT 0538 98-04-23 17:05:57 12.1v VEC Outlier rejection ON OPER KLZ TX ID A-SP 25.0 _____ ____ __________________ 9428 LINE SPREAD 1 CL 0.900 HANN Outlier 2.00 ON Remote OFF Chan 1 Robust OFF LoPass...
Page 288 NATURAL SOURCE MAGNETOTELLURICS XAMPLE OF CALAR IELD 0384 AMT 0538 98-04-09 18:38:39 11.8v VEC 1 Rx 4 N 60 32 Hz 32 Bursts 1 Stack 13.085u 0.907 10.73 023O -0.06 17.443u 0.978 20.56 023O 0.00 20.851u 0.940 28.22 023O 0.20 20.399u 0.976 28.04...
Page 289 NATURAL SOURCE MAGNETOTELLURICS XAMPLE ENSOR 0120 AMT 0538 98-04-09 16:19:12 12.1v TEN 1 Rx 3 N 60 32 Hz 32 Bursts 1 Stack 6.6429u 0.896 6.238 023O -0.02 34 1.6298u -404.6 231O -0.97 4.7596u 0.003 8.606u 031O 0.19 34 8.8842u 675.3 041O -2.74...
Page 290 NATURAL SOURCE MAGNETOTELLURICS XAMPLE ENSOR EMOTE EFERENCE 0226 AMT 0538 98-05-07 13:02:10 13.2v TEN OPER 1 TX ID 1 A-SP 1 LINE SPREAD 1 CL 0.900 HANN Outlier 2.00 ON Remote LoPass Notch+60,3-5,9 52 Passed 1.00069 LoPass Notch+60,3-5,9 31 Passed 1.00151 LoPass Notch+60,3-5,9 53 Passed 0.99986...
Page 291: Notes On Field Configurations
(floating ground), or a reference level that exceeds common mode limits of the input amplifiers. Common mode levels for the standard configuration of the GDP-32 are ±10 volts. With external isolation amplifiers, this level can be extended to several thousand volts, but in exchange you have to contend with higher noise and a lower overall frequency response.
Page 292: Cascade Decimation Overview
NATURAL SOURCE MAGNETOTELLURICS 13.10 CASCADE DECIMATION OVERVIEW For the upper three frequency bands (very high, high and medium bands), data are gathered in time series records of 4141 points each (4096 + 45 extra points used in the decimation filter). The data are then processed in 32 point records, for all of the data points for that level.
Page 293 NATURAL SOURCE MAGNETOTELLURICS Medium Frequency Band Sample Rate = 256 Hz Decimation Base Frequency Frequencies Levels Frequency Interval Obtained .5 Hz 3 - 64 Hz 64 Hz 24, 32 12, 16 High Frequency Band Sample Rate = 4096 Hz Decimation Base Frequency Frequencies...
Page 294: Data Dump Utility
A default file name is given to file as BLKxxxx.OUT, where is the xxxx next field data cache block number. Below is the data from the field data cache. The GDP-32 generated a time series file called BLK66.OUT. 0066 AMT 0533 94-10-28 13:30:49 11.5v TEN...
Page 295 Hz (log base 2 is 4), medium band's sample rate is 256 Hz (8), high band is 4096 (12), and the very high band has a sample rate of 32768 Hz (15). The second line contains the GDP-32 actual channel number minus 1 that this column of data represents.
Page 296: Time Schedule
NATURAL SOURCE MAGNETOTELLURICS 13.13 TIME SCHEDULE Three programs have an option for automatic data acquisition: MT/AMT, CSAMT, and TDCSMT. For MT/AMT, 0097 AMT 0538 12.3 15 Mar 98 08:57:49 the automatic time schedule can be entered Survey Tensor AMT 1 Rx 1 N OUT 384-8192 5 Stacks...
Page 297 NATURAL SOURCE MAGNETOTELLURICS There can be up to 8 individual time schedule entries as shown in the above display. All entries are executed in the order shown in the menu. The time entered here determines when the automatic time schedule for Start Time.
Page 298 NATURAL SOURCE MAGNETOTELLURICS SAMPLE TIME SCHEDULE SETUP: 0097 AMT 0538 12.3 15 Mar 98 08:58:49 AMT Time Schedule Auto-Power turn-0ff No Start Time 9:44:00 Total Time 0:22: 0 End Time 10:06:00 Freq Band Stacks Duration Levels 384-8192 48-1024 3- 64 .0938- 4 48-1024 48-1024...
Page 299 NATURAL SOURCE MAGNETOTELLURICS HAVING ACQUIRED DATA, WAITING FOR STOP TIME: 0146 AMT 0538 12.3 15 Mar 98 09:46:42 Survey Tensor AMT Stop Time 09:47:00 Here we have acquired the specified 1 Rx 1 N OUT number of stacks in the very high 384-8192 10 Stacks frequency band, as specified in the time...
Page 300 NATURAL SOURCE MAGNETOTELLURICS If the operator presses while the Escape 0097 AMT 0538 12.3 15 Mar 98 09:50:42 program is acquiring data, the prompt Survey Tensor AMT Stop Time 09:47:00 "Exit schedule" will be time 1 Rx 1 N OUT 384-8192 10 Stacks displayed as above.
Page 301: Field Configurations
NATURAL SOURCE MAGNETOTELLURICS 13.14 FIELD CONFIGURATIONS INGLE TATION Single station MT SC-8 Signal Conditioner kjiu kjiu lkuhiuyi7k dsiuyg kjiu kjiu iurtiufskuhkujhgfdf lkjoier poireyt iuh Section 13, Page 33 May 2002...
Page 302: Local Remote Reference Mt
NATURAL SOURCE MAGNETOTELLURICS OCAL EMOTE EFERENCE Local remote reference MT SC-8 Signal Conditioner kjiu kjiu lkuhiuyi7k dsiuyg kjiu kjiu iurtiufskuhkujhgfdf lkjoier poireyt iuh Up to 1 km May 2002 Section 13, Page 34...
Page 303: Local Remote Reference Mt
OCAL EMOTE EFERENCE Two or more tensor MT stations clock synchronization with any separation distance SC-8 Signal Conditioner Manual Filter Zonge Engineering & Research Organization Inc. Function Select Tucson, Arizona U.S.A. Any Distance SC-8 Signal Conditioner Manual Filter Zonge Engineering &...
Page 304: Mt Measurement Lusters
NATURAL SOURCE MAGNETOTELLURICS MT M EASUREMENT LUSTERS MT Measurement Clusters Along A Line clock synchronization with any separation distance SC-8 Signal Conditioner kjiu kjiu lkuhiuyi7k dsiuyg kjiu kjiu iurtiufskuhkujhgfdf lkjoier poireyt iuh Station 1 Station 2 Station 3 Any Distance SC-8 Signal Conditioner kjiu kjiu...
Page 305: Method To Field-Check Magnetic Sensors
NATURAL SOURCE MAGNETOTELLURICS 13.15 METHOD TO FIELD-CHECK MAGNETIC SENSORS It is possible to field check the operation of an antenna by using the GDP calibrator as a signal source as follows: 1. Connect a 1 K ohm resistor between the Black and Red input terminals for channel 1. 2.
Page 306 14. PLOTTING ROUTINES 14.1 INTRODUCTION ..............2 14.2 PLOT SUMMARY FOR DIFFERENT DATA TYPES..4 TDIP....................... 4 RPIP ....................... 4 CR........................4 CSAMT ......................4 TEM........................ 4 14.3 EXAMPLES OF OPERATION ..........5 14.4 ERROR MESSAGES ............... 6 May 2002...
Page 307: Introduction
GDP-32 INSTRUCTION MANUAL 14.1 INTRODUCTION The plotting routines for the liquid crystal display perform rudimentary but useful plots of the five types of data that may appear in the data cache. The PLOT function is invoked by pressing while viewing data in the FIELDATA cache. At no other time can the PLOT function be called.
Page 308 The GDP-32 assumes that there are valid data blocks in the range of blocks requested (excluding header blocks). If there is data within this range of a different type than the type of data in the ending block, the plot program will skip the non-conforming blocks.
Page 309 GDP-32 INSTRUCTION MANUAL 14.2 PLOT SUMMARY FOR DIFFERENT DATA TYPES TDIP Linear Decay Plot At least one block required Multiple blocks are averaged Error bars presented RPIP CP (complex plane) Plot At least two different frequencies required One data point plotted for each different frequency...
Page 310: Examples Of Operation
PLOTTING ROUTINES 14.3 EXAMPLES OF OPERATION EXAMPLE 1: The user is viewing TDIP data, block 513. This block has data for three channels. To plot data for this block for all three channels, one channel at a time, the user proceeds as follows: Ending Block: Enter Starting Block:...
Page 311: Error Messages
GDP-32 INSTRUCTION MANUAL 14.4 ERROR MESSAGES "Error in LOG data" There are negative values for either frequency or resistivity for CSAMT, TDCSMT and AMT only. It is difficult to get a negative frequency value, but the check is there. For TEM we take the absolute value of the decay value.
Page 312 15. MATHEMATICAL ALGORITHMS 15.1 STANDARD ERROR OF THE MEAN (SEM) ....2 15.2 3-POINT DECOUPLING............3 15.3 A NOTE ON RESISTIVITY CALCULATIONS ....4 15.4 RESISTIVITY CALCULATIONS......... 4 DIPOLE - DIPOLE..................4 POLE - DIPOLE.....................4 POLE - POLE ....................4 GRADIENT ....................5 SCHLUMBERGER ..................9 15.5 USEFUL CSAMT EQUATIONS..........
Page 313: Standard Error Of The Mean (Sem)
GDP-32 INSTRUCTION MANUAL 15.1 STANDARD ERROR OF THE MEAN (SEM) The standard error of the mean or SEM is the standard deviation divided by the square root of the number of cycles or bursts used to obtain the data: −...
Page 314: 3-Point Decoupling
For extreme coupling environments (e.g., 10 ohm-meter ground and using 300 m dipoles), we recommend that full frequency CR be used to permit more precise coupling removal. The formula used for 3-point decoupling in the GDP-32 is as follows: φ...
Page 315: A Note On Resistivity Calculations
(V ), so the square-wave current amplitude can be used directly. 15.4 RESISTIVITY CALCULATIONS Five types of arrays are defined in the GDP-32 programs for which resistivities are to be calculated. These are Dipole-Dipole, Pole-Dipole, Schlumberger, and Gradient. The parameters that are manually entered by the operator, and the values that are measured by the GDP-32 are bracketed [] in the description of parameters.
Page 316: Gradient
MATHEMATICAL ALGORITHMS GRADIENT Rx, Ry running survey west to east N= 1 West East Ax, Ay Bx, By N= -3 running survey east to west Rx, Ry where: π − − = √(Dy + Dx A = √(Dy + (Dx+N A = √(Dy + (Dx+N = √(Dy...
Page 317 GDP-32 INSTRUCTION MANUAL GRADIENT ARRAY NOTES The objective of this resistivity calculation scheme is to make it easy to input grid coordinates for gradient surveys. CAUTION: The LINE number in Menu 2 has been changed to Ay in this program as the Y- coordinate of the AB transmitter dipole.
Page 318 MATHEMATICAL ALGORITHMS An example of a GRADIENT array setup: NORTH Rx, Ry running survey west to east N= 1 West East Ax, Ay Bx, By SOUTH The AB transmitter dipole is set up on grid line 52,000 N, a-spacing = 50 m, the north-south baseline runs through the middle of the array, so that A is at -350 meters (350 W) and B is at +350 meters (350 E).
Page 319 GDP-32 INSTRUCTION MANUAL MENU 2 TDIP 0533 15 Mar 94 08:53:45 A-Sp = 50 m OPERATOR 1 TX ID 1 A-SP JOB 91001 52000 N SPREAD 1 = 52000 CONTINUE: Next menu, ESCAPE: Prev. menu 0094 TDIP 0533 12.3 15 Mar 94 08:57:59...
Page 320: Schlumberger
MATHEMATICAL ALGORITHMS SCHLUMBERGER Transmitter Rcvr mA = ½ (AB- Na) mB = ½ (AB+Na) π nA = ½ (AB+Na) − − nB = ½ (AB- Na) Where: a = [A-SP] = a-spacing (size of receiver dipole) in meters = Received voltage in volts [Measured]. = 4/π...
Page 321 GDP-32 INSTRUCTION MANUAL LINE number in Menu 2 is used by data processing programs as a grid coordinate, in a direction perpendicular to the survey line. The Tx and Rx fields are used as survey parameters by data processing programs.
Page 322: Useful Csamt Equations
MATHEMATICAL ALGORITHMS 15.5 USEFUL CSAMT EQUATIONS Cagniard Resistivity, ρ where: E = electric field in mV/km ρ (ohm-meters) H = magnetic field in gamma (γ) ⊥ or nanoteslas (nT) Phase difference,Φ : Φ = phase in milliradians φ φ φ (milliradians) −...
Page 323: Useful Tem Equations
GDP-32 INSTRUCTION MANUAL 15.6 USEFUL TEM EQUATIONS Apparent Resistivity, ρ , (late time) ρ (ohm-meters) × − 6 3219 Diffusion depth, d: ρ (meters) σ Equivalent depth of investigation, D: ρ (meters) σ where: = transmitter moment in square meters...
Page 324: Gdp-32
16. GDP-32 DESIGN 16.1 BASIC DESIGN CHARACTERISTICS ........2 16.2 RECEIVER LAYOUT..............4 16.3 CARD-PC MPU BOARD ............8 16.4 BD287 FRONT PANEL BOARD ..........8 16.5 BD183 ANALOG BOARD ............10 ..................10 ELAY UNCTIONS ................10 IFFERENTIAL MPLIFIER DAC..................
Page 325: Basic Design Characteristics
GDP-32 INSTRUCTION MANUAL 16.1 BASIC DESIGN CHARACTERISTICS A complete description of the external characteristics of the GDP-32 is located in Section 2 – Description of the GDP-32 Receiver. The GDP-32 case is divided into two sections: Analog and Digital. These sections are kept separate to minimize noise pickup and for ease in trouble-shooting and repair.
Page 326: Design
COM B ASIC Network Ext kb sw Controller Hard Flash PC104 Disk Disk Connecter Card-sized CPU module Floppy COM A 3.3v LCD Contrast 3.3v voltage LPT 1 Figure 16.1 (b) - GDP-32 Block Diagram 2 Section 16, Page 3 May 2002...
Page 327: Receiver Layout
An oven-stabilized 4.980736 MHz crystal oscillator is mounted directly to the timing board (BD244 or BD288) in the large case GDP-32 . In the small case GDP-32 , the crystal is mounted next to the battery compartment.
Page 328 QL8X12 ASIC Power Monitor (circuit 2543) Keyboard connector Relay Flash Disk Card PC PIC17C756 MPU Mother Board BD287 SRAM bat (LT7P) Display connector Zonge bus connector Shield Figure 16.2(a) - Explosion of Front Panel Assembly Section 16, Page 5 May 2002...
Page 329 GDP-32 INSTRUCTION MANUAL Figure 16.2 - Photo of Front Panel Assembly – (b) Back Side, (c) Front Side May 2002 Section 16, Page 6...
Page 330 GDP-32 DESIGN Figure 16.3 – BD287 including the flash disk (top) and the Card PC socket (below) Section 16, Page 7 May 2002...
Page 331: Card-Pc Mpu Board
LAN interface The flash disk retains data for extended periods of time even when the GDP-32 is turned off. The capacity of the flash disk is sufficient to hold many days of data under normal use. Time series data obtained while running the AMT/MT program are stored on the hard drive.
Page 332 GDP-32 DESIGN Figure 16.4 - Board diagram of the BD287 Front Panel Board Section 16, Page 9 May 2002...
Page 333: Bd183 Analog Board
INSTRUCTION MANUAL 16.5 BD183 ANALOG BOARD The small case GDP-32 T has an analog board capacity of 6 channels. The large case GDP-32 has an analog board capacity of 16 channels. The GDP-32 uses one board for each active channel. Boards are installed (up to case capacity) into sequential slots beginning with slot 1, the right-most slot of the analog card cage.
Page 334 GDP-32 DESIGN Cal + OFFSET D/A Field + x.125 Guard GO Gain x.125 1, 4, 16 Powerline Differential Notch Field - Amplifier Filter Attenuator Cal - Function Select (see inset below) To Front Panel To STD Bus Anti-Alias Converter Buffer...
Page 335 GDP-32 INSTRUCTION MANUAL BD192 (notch Filters) J2 Analog Input U/4 Serial Number PAL U/2 (A/D) Zonge Bus Connector Figure 16.5(b) - Analog Board, BD183D May 2002 Section 16, Page 12...
Page 336: Powerline Notch Filter
GDP-32 DESIGN POWERLINE NOTCH FILTER The Powerline Notch Filter can be set to reject the fundamental, 3rd, 5th and 9th harmonics, or any other combination of four harmonic power line frequencies desired. For example in a country with 50 Hz power mains, the standard filters supplied will reject 50, 150, 250 and 450 Hz.
Page 337: Analog-To-Digital Converter
GDP-32 INSTRUCTION MANUAL ANALOG-TO-DIGITAL CONVERTER The analog-to-digital converter (ADC) converts the received analog signal to a digital format that is stored in computer memory along with other card parameters. Before the analog voltage signals can be digitally processed, they must first be properly sampled and converted to digital format using an ADC.
Page 338 GDP-32 DESIGN Multiplexer +12v (DC Signal) Temperature Power 16 bit Battery Converter Calibrate (DAC) (ACSignal) Analog Boards Timing +12v Ohmeter Power ImA / 100 u A Inverter 2.490368 MHz BD244 or BD288 Duty Cycle 4.980736 MHz Crystal BINARY REAL TIME...
Page 339 GDP-32 INSTRUCTION MANUAL U1 - ASIC Serial No. U2 - ASIC Address Decode Real Time Clock U15/U4 - Calibration Signal D/A (two types possible) J6 - 4.98 MHz Output Frequency to Tx I/O Connector J5 - Sensor Board Crystal Connector...
Page 340 GDP-32 DESIGN Figure 16.6 (c) - Calibration and Timing Board, BD288 Section 16, Page 17 May 2002...
Page 341: The Calibration And Timing Board
The calibration section consists of an AC signal and a DC voltage level from a 16-bit DAC, and temperature and humidity sensors. All of these components are routed to each of the analog channels. Under the control of the GDP-32 software the calibration...
Page 342: Timing Section
Real-Time Clock A second ASIC has been added to BD244 and BD288, providing a real time clock driven by the 2.490368 MHz frequency. This clock is set by the GDP-32 firmware and thereafter, data are time-stamped with the time kept by BD244/288 rather than the less accurate time kept by the MPU board (running under ROM-DOS).
Page 343 GDP-32 INSTRUCTION MANUAL SMALL CASE INSIDE CASE LID Front Panel MPU Board Flash RAM Card cage Batteries for timing & & Crystal analog card Control I/0 Analog I/0 Figure 16.7 - Small Case May 2002 Section 16, Page 20...
Page 344 GDP-32 DESIGN LARGE CASE Inside CASE GROUND GROUND ZONGE ENGINEERING Output Output RESEARCH ORGANIZATION Case Lid TUCSON, ARIZONA USA Front Panel MPU Board Flash RAM Mother board & card cage for timing & analog cards Analog Control I/O Panel I/0 Panel Figure 16.8 (a) - Large Case...
Page 345 GDP-32 INSTRUCTION MANUAL LOWER CASE PANEL ANALOG CARDS, INSIDE GDP-32II 4 Pin MAIN CASE Molex Connector TIMING CARD & Foam Space for CRYSTAL, INSIDE Strip terminal block BATTERY COMPARTMENT FOAM LID Water Resistant Gasket Batteries B1,B2,B3,B4 BATTERY COMPARTMENT Figure 16.8 (b) - Large Case Battery Compartment...
Page 346: The Battery Compartment
4.980736 MHz quartz Crystal Oscillator (see footnote on page 16.19). The Crystal Oscillator is mounted directly to the calibration and timing board on the large case GDP-32 . On the small case GDP-32 T, it is mounted next to or on top of the battery compartment.
Page 347: Maintenance And Trouble-Shooting Maintenance
17. MAINTENANCE AND TROUBLE-SHOOTING 17.1 BOARD FUNCTIONS AND DIAGNOSTICS ...... 2 ................4 IAGNOSTICS ROGRAM .................. 8 IAGNOSTIC XAMPLES TEM D 194)..........12 IAGNOSTICS OARD 17.2 HANDLING BOARDS AND EPROMS....... 14 ............. 14 EMOVING AND NSERTING OARDS 17.3 DIGITAL BOARD PROBLEMS.......... 16 ............
Page 348: Board Functions And Diagnostics
GDP-32 INSTRUCTION MANUAL 17.1 BOARD FUNCTIONS AND DIAGNOSTICS The diagnostics routine is a powerful tool for testing and identifying problems on both the Analog Boards, and Calibrate and Timing Board. The diagnostics software allows the operator to manipulate all board functions that are controlled by the computer.
Page 349 MAINTENANCE DIAG 13 Mar 96 17:00:00 Freq 1 Hz SN 177 1024 Hz Power OFF Notch 50,3-5,9 DUTY 100% DiffAmp Xmitter ON Cal Pow OFF Atten Mux Pow OHM .000V Notch .000 V Gains Alias OUT LO Value Figure 17.2 (a) - Diagnostic Screen Output ANALOG + 100 uA...
Page 350 GDP-32 INSTRUCTION MANUAL THE DIAGNOSTICS PROGRAM Running Diagnostics: 1. From the Main Menu press , Utilities. 2. Press , Diagnostics. If the receiver has just been turned on and no Survey Programs have been started, the screen appears as shown above in Figure 17.2 (a).
Page 351 MAINTENANCE External Monitoring - The ADC convert command (sample rate) can be monitored on bus connector J1 pin A30, and EOC (end of convert) on pin A31. (Duty) Duty Cycle Changing this parameter allows the operator to select a duty cycle of 100% to generate a frequency-domain waveform, or a duty cycle of 50% to generate a time- domain waveform.
Page 352 GDP-32 INSTRUCTION MANUAL Atten IN Sets the Attenuator to IN or OUT. DAC 0 .000V The SP or Offset DAC voltages in counts and volts respectively. Enter either value and the other is automatically updated. Count values range from -32768 to 32767.
Page 353 MAINTENANCE The "y" value is a decimal representation of the most recent voltage conversion, taking into account all appropriate gains and attenuators. The "z" value represents the actual ADC count. The analog card must be turned ON to receive values on this line. To have the ADC take a reading, press Enter Note: The REFERENCE voltage should be 4.5 volts.
Page 354 GDP-32 INSTRUCTION MANUAL ACAL The ADC goes through an internal calibration each time the system is turned on, or before each measurement. This is normally done automatically during data acquisition. To implement ADC calibration manually press DIAGNOSTIC EXAMPLES Example using one analog channel Procedure to determine the temperature inside the case: 1.
Page 355 MAINTENANCE SELECT UP Move back to the field and press to display CAL. Put the channel selector Home switch on your lid panel to Channel 1. The needle will swing back and forth at a 1 Hz rate. This was the default frequency selected during turn-on, and you can read it since channel 1 is turned on and the relay is IN.
Page 356 GDP-32 INSTRUCTION MANUAL DIAG 13 Mar 96 17:00:00 Freq .125 Hz SN 177 128 Hz Power ON Notch 50,3-5,9 Timing DUTY DiffAmp Xmitter ON Analog Cal Pow OFF Atten Cards Mux Pow OHM -.003V Notch .000 V Gains 16 Calibrate...
Page 357 MAINTENANCE NEXT FIELD SELECT UP SELECT DN 16. Press to get to the second gain stage. Use to change it to 1. Pg Dn Home At this point you can now adjust the gains and DAC (SP) to watch the effect on the meter.
Page 358 GDP-32 INSTRUCTION MANUAL NANOTEM DIAGNOSTICS (FOR BOARD 194) The NanoTEM diagnostics program is an abbreviated form of the main diagnostics program, and is valid when a NanoTEM board is installed. DIAG 13 Mar 96 17:00:00 Freq 32 Hz 32768 Hz Power ON A/D 1.2 usec...
Page 359 MAINTENANCE Connect (IN) or disconnect (OUT) the ohmmeter connection for measuring contact resistance. Samp En Enable (ON) or disable (OFF) the sample rate circuit on the NanoTEM card. Used in conjunction with Trig. Trig TD Enable taking data upon transmitter turn-off (Time Domain - TD) or at the start of the positive cycle (Frequency Domain - FD).
Page 360: Handling Boards And Eproms
1. Locate the appropriate bus slot. The boards in the analog card cage of both the large and small case GDP-32 are oriented so that the board component side faces right as you look into the card cage.
Page 361 MAINTENANCE This Page Intentionally Left Blank Section 17, Page 15 May 2002...
Page 362: Digital Board Problems
Before trying to debug problems with any of the boards, call the Zonge Tucson Office, or send us a fax or email message with a description of the problem. Our staff is more than happy to help with any problems concerning our equipment.
Page 363 MAINTENANCE Analog signal cable (from Analog I/o panel) Cable label Jumper cable (to Analog board & calibrate board) Jumper cable (to Analog boards 3-8) Analog Signal Connector Nylon board guides Board Connection Clamp Analog Board 3 Figure 17.3 Jumper Cable connection to an Analog Board Section 17, Page 17 May 2002...
Page 364 GDP-32 INSTRUCTION MANUAL Figure 17.4 (a) - Wiring configuration for batteries in the small case GDP-32 +12v to Electronics (Red) From Battery Charger (Blue) (Black) Molex Connector (03-09-1042s/2042p 4-pin) Black Blue Fuse Terminal Block 6v batteries 4-each Yuasa NP10-6 10Ah Figure 17.4 (b) - Wiring configuration for batteries in the large case GDP-32...
Page 365 MAINTENANCE Black Black Figure 17.4 (c) – Soldered wiring configuration for batteries in the small case GDP-32 Molex Connector (03-09-1042s/2042p 4-pin) Black Fuse Blue Black Black Black 6v batteries 4-each Yuasa NP10-6 10Ah Figure 17.4 (d) – Soldered wiring configuration for batteries in the large case GDP-32...
Page 366: Battery And Power Problems
ON/OFF Press button on the front panel to see if the MPU board boots up and displays the Zonge logo. If the Zonge logo is displayed the circuit breaker is operating properly. This indicates that there is a problem with the Analog Card Cage Subassembly.
Page 367 Front Panel. If Crystal LED the MPU board is able to boot up and display the Zonge logo, then the front panel is probably okay (with the exception of the circuit breaker chip and, possibly R3) and the fundamental problem lies somewhere else.
Page 368 Zero battery voltage can indicate a disconnected battery cable or a blown fuse. Check the fuses and then enter the battery compartment and check for good connections at the terminals for each battery, the 3-pin white Molex connector, and at the terminal block (on the GDP-32 large case) as shown in Figure 16.8(b).
Page 369 MAINTENANCE Replacing Faulty Batteries - Small Case The batteries for the small case GDP-32 T are secured in the battery compartment accessible by removing the front panel. 1. Remove the 4 screws securing the lid to the battery compartment. 2. Lift each battery out and remove the spade lugs that connect the battery cable harness to the battery.
Page 370: Synchronization Problems
Crystal Oscillators Too Far Apart In Frequency If the Crystal Oscillator frequencies are far enough apart that the frequencies cannot be made identical by adjusting the electronic tuning circuit on the GDP-32 and the oscillator trim potentiometer on the XMT-32, the solution is to adjust the mechanical trim on either the GDP- or the XMT-32 crystals.
Page 371 Crystal Oscillators electronically first (Section 6.2). If mechanical adjustment is necessary, begin with adjusting the crystal on the XMT. NOTE: It is always best to contact a Zonge engineer before attempting to perform mechanical adjustments. Mechanical adjustment of the XMT-32 crystal...
Page 372 BATT/PHASE meter due to the frequency differences between the crystals. 12. Use the plastic trim tool supplied with the GDP-32 to adjust the mechanical trim pot inside the crystal can. Very carefully rotate the pot about 1/4 turn in one direction and then the other to determine which direction it should be turned to bring the two crystals into synchronization.
Page 373 The board is located in the left- most slot of the analog card cage, accessible by opening the battery compartment (bottom lid) of the GDP-32 . Follow the same procedure as indicated for the GDP-32 Section 17, Page 27 May 2002...
Page 374: Cold Weather Operation
GDP-32 INSTRUCTION MANUAL 17.7 COLD WEATHER OPERATION An optional LCD heater is used to heat the display when the ambient temperature is below -18° C (0° F). In particular it is used when the display response becomes too slow to be useful.
Page 375: Pinouts For Connectors
MAINTENANCE 17.8 PINOUTS FOR CONNECTORS Transmitter I/O Connector panel mount connector MS3II2EI4-I5P pin view, male view cable connector MS3II6FI4-I5S (solder view, female pins) J R N C PIN FUNCTION RESET RETURN COMMON TIME DOMAIN PERIOD (NOT USED) 5 MHz CLOCK (NOT USED) (NOT USED) RESET...
Page 376 GDP-32 INSTRUCTION MANUAL Parallel Connector panel mount connector MS3II2E16-26P pin view, male pins cable connector MS3II6BI2-26S (solder view, female pins) PIN FUNCTION PIN FUNCTION A SIG GND P SIG GND B (NOT USED) R SIG GND C SIG GND S SIG GND...
Page 377 MAINTENANCE Battery Charge Connector panel mount connector KPTO2EI2-3S (socket view, female pins) cable connector KPT O6BI2-3P ( solder view, male pins ) POSITIVE NEGATIVE (NO CONNECTION) Figure 17.7 Battery Charge Connector Figure 17.8 Analog Output Ports Section 17, Page 31 May 2002...
Page 378 GDP-32 INSTRUCTION MANUAL Serial Connector panel moount connector MS3II2E-I0P pin view, male view cable connector MS3II6B12-I0S (solder view, female pins) H A B G K J C F E D PIN FUNCTION (NOT USED) (NOT USED) TRANSMITTED DATA CLEAR TO SEND...
Page 379 MAINTENANCE Analog Input Connector Channel 1-8 panel mount c onnec tor MS3II2EI6-26S (s ock et v iew, male pins ) cable c onnec tor MS3II6J 16-26P (s older v iew, male pins ) W X Y Analog Input Connector Channel 9-16 panel mount c onnector MS3II2EI6-26S PIN FUN CTION PIN FUNCTION...
Page 380 GDP-32 INSTRUCTION MANUAL RESET BPERIOD RESET AGND BDUTYC HPB7 AGND HPB6 J4 (GPS) AGND AGND X5MHz AGND AGND BSCLK (KEY) 14/16 +CAL +CAL +CAL BLOAD -CAL -CAL -CAL GPULSE +CAL +CAL INTCAL+ BSHIFTIN -CAL -CAL INTCAL- BD183 BD194 BD288 BD288 &...
Page 381 MAINTENANCE Figure 17.12 Zonge Bus Section 17, Page 35 May 2002...
Page 382: Error Messages
GDP-32 INSTRUCTION MANUAL 17.9 ERROR MESSAGES Not completed at this time. See footnote: Page 16.23: GDP-32 Design, The Calibration and Timing Board, Timing Section, Frequency Generator. May 2002 Section 17, Page 36...
Page 383: Gdp-32
18. GDP-32 USERS NOTES This section of the manual is provided for users to add their own field operating notes as well as to compile notes sent out by Zonge Engineering concerning operation of the GDP-32 and other ZERO equipment.
Page 384: Use Of The Attenuator
1 ms. 18.2 RECALIBRATE WHEN REPLACING ANALOG CARDS With the ease in changing the configuration of the GDP-32 analog cards, clients have been moving cards between channel positions in the internal card rack when they suspect some kind of electrical problem.
Page 385: Connecting Peripherals To The Gdp-32
18.3 CONNECTING PERIPHERALS TO THE GDP-32 When connecting peripherals (computers, XMT-16 or XMT-32 controllers, printers, etc.) it is always best to connect the cable first to the peripheral and then to the GDP-32 . This will minimize any static shock effects that might occur.
Page 386 Calibrate output RS232 input for time sequence table FUNCTIONS Can be synchronized with GDP-32 Receiver for synchronous measurements. Capable of controlling GGT-series and ZT- and NT-series transmitters in both time and frequency domain. Continuous phase coherency between 1024 second period and 8192 Hz. 20 milliamp control signal for transmitter control.
Page 387: Transmitter Control Interface
GDP-32 USER'S NOTES 18.6 TRANSMITTER CONTROL INTERFACE The GGT series transmitters use a twenty milliamp control signal with a rise and fall time of less than one microsecond. There are two control signals used; Transmitter on/off and Polarity. 1. TRANSMITTER ON/OFF. This signal is used in the time domain mode to turn off the transmitter when needed depending on the duty cycle required.
Page 388: Resistance Of Standard Gauge Wire
GDP-32 INSTRUCTION MANUAL 18.7 RESISTANCE OF STANDARD GAUGE WIRE Wire Size Ohms per Ohms per 1000 ft 1000 m 1.04 1.65 2.62 4.17 13.7 METRIC WIRE 18.0 May 2002 Section 18, Page 6...
Page 389: Setup Instructions For Loadbank Lb2500
GDP-32 USER'S NOTES 18.8 SETUP INSTRUCTIONS FOR LOADBANK LB2500 6.25 Amperes maximum through any 25 Ω resistor. 225 Watts maximum though the 500 Ω resistor. 25Ω Ω Ω Ω 25Ω Ω Ω Ω 25Ω Ω Ω Ω 25Ω Ω Ω Ω...
Page 390: Antenna Designations
GDP-32 INSTRUCTION MANUAL 18.9 ANTENNA DESIGNATIONS Antenna numbers are comprised of two parts - the antenna serial number, and the antenna or calibration type: NNNC NNN antenna serial number channel number, antenna type or calibration type Values for C: Reserved for ANT/1 CSAMT antennas 1, 2 Reserved for dual axis AA antennas: 1 is channel 1, 2 is channel 2.
Page 391: Serial Port Data Transfer Using Hyperterminal
GDP-32 USER'S NOTES 18.10 SERIAL PORT DATA TRANSFER, HYPERTERMINAL Start HyperTerminal Click on the "Start" button. Move the mouse to "Programs", then “Accessories”, then click on “HyperTerminal”. Note: If HyperTerminal is not included, install it using your Windows installation CD.
Page 392: Local Area Network (Lan) Connection
18.13 OBSERVE PROPER TURN-OFF PROCEDURE To extend the life of the Liquid Crystal Display (LCD), please always use the proper turnoff procedure for the receiver. See Section 3 Page 5 of the GDP-32 Manual. May 2002 Section 18, Page 10...
Page 393: Fast Transient Electromagnetics Nanotem
ARALLEL 19.12 OUTPUTTING DATA............24 ................24 UTPUT TO A OMPUTER ................25 UTPUT TO A RINTER NETWORK..........26 UTPUT ERIES NOTE: Much of this information has been extracted from the GDP-32 Receiver manual, Section 7 DATA and Section 12 TEM. October 2002...
Page 394: The Nanotem System
4 amperes. Two versions of the NanoTEM transmitter are available. The first, the NT-20, is an external transmitter system, and the second is the NT-32 that utilizes a transmitter integrated within the GDP-32 case. Operating instructions for the NT-20 transmitter are included in a separate manual included with the NT-20.
Page 395: Nanotem Hookup Directions
FAST TRANSIENT ELECTROMAGNETICS PROGRAM 19.2 NANOTEM HOOKUP DIRECTIONS Using a 20 X 20 m Transmitter Loop and NT-20 or NT-32 Transmitter 1. Use the 1 K-ohm bridge that is supplied. Plug it into the input for the channel that has the NanoTEM card (channel 3 in this example), and connect the ground wire to COM.
Page 396: Transmitter System
GDP-32 INSTRUCTION MANUAL 19.3 NT-32 TRANSMITTER SYSTEM Setup of the NanoTEM system using the NT-32 transmitter is similar to the steps used when using all of the other Zonge Transmitter systems. NANOTEM 0610 15 Mar 98 08:53:40 Menu 1 Program: NanoTEM Sample Rate: 1.2usec...
Page 397 OPER JOHN DOE TX ID 1 A-SP Menu 3, as with all of the data collection JOB 94001 LINE 1 N SPREAD 1 programs GDP-32 allows Station individual channels to be enabled, station 1 Hz numbers to be entered for each channel,...
Page 398 GDP-32 INSTRUCTION MANUAL 0094 NANOTEM 0610 12.3v 15 Mar 98 08:57:49 Gain/F10 SubMenu Survey In loop Stacks 1 Rx NT32 Battery: 12.0 V The setup menu for the NT-32 transmitter 32 Hz 128/ 128 Cycles NT32 Current: 1.1 Window 1.549m Delay 122.1u Alias can be accessed by pressing 8.
Page 399: Nanotem Turnoff Times
The NanoTEM program has been used successfully in highly conductive as well as highly resistive environments. 19.5 NANOTEM FIELD DATA CACHE At this time, all of the GDP-32 programs, except for the NanoTEM program, initialize the data cache according to the outline in Chapter 7.4. Initialize the NanoTEM data cache as follows:...
Page 400 GDP-32 INSTRUCTION MANUAL DOS PROCEDURE FOR NANOTEM CACHE INITIALIZATION: Press to get into DOS. The prompt will be displayed. C:\> Type: DEL NTDATA.CAC Type: and page through the files. should not be included. DIR /P NTDATA.CAC Type: MENU The LOGO screen will now be displayed.
Page 401 5. Double click on the icon for NTCNVRT.EXE 6. The program will convert the file in the folder to an ASCII file NTDATA.CAC To use Zonge Engineering data processing software rename the file NTDATA.PRN. and begin the data processing with the programs SHRED.EXE and NTDATA.RAW TEMAVG.EXE.
Page 402: Nanotem Window Centers
GDP-32 INSTRUCTION MANUAL 19.6 NANOTEM WINDOW CENTERS SAMPLE PERIOD: 1.6 MICROSECONDS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 µ sec 0.0 µ sec 0.0 µ sec 10.4 11.2 13.6 12.8 14.5 16.8 16.1...
Page 403 FAST TRANSIENT ELECTROMAGNETICS PROGRAM SAMPLE PERIOD: 1.2 MICROSECONDS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 µ sec 0.0 µ sec 0.0 µ sec 10.2 10.8 12.6 12.1 13.3 15.6 14.5 16.9 19.2 18.1 20.5 24.0...
Page 404 GDP-32 INSTRUCTION MANUAL SAMPLE PERIOD: 1.2 MICROSECONDS, SHALLOW APPLICATIONS Zero Delay After Current Turnoff WINDOW POINTS WINDOW WINDOW WIDTHS PER WINDOW CENTERS BEGINNING 0.0 u sec 0.0 u sec 0.0 u sec 11.4 10.8 12.0 13.8 13.3 14.5 16.3 15.7 16.9...
Page 405: Nanotem Sample Data
FAST TRANSIENT ELECTROMAGNETICS PROGRAM 19.7 NANOTEM SAMPLE DATA 0778 NANO0534 94-12-31 17:58:13 11.7v INL OPER SAU TX ID T-21 A-SP JOB 94118 LINE SPREAD 50% RxM 10000 TxX 1 TxY 1 #T 1 Ref 0.113 Tx Delay 1.5 Antenna Delay 2 Alias IN Robust None LoPass...
Page 406: The Nanotem Calibrate Box
BLACK provided with the calibrate box. 2. Plug the NT-I terminal connector (i.e., black double banana plug with single banana plug pigtail cable) into a GDP-32 input channel corresponding to a NanoTEM analog card. Plug the pigtail into the jack of the GDP-32 3.
Page 407 INPUT on GDP CHANNELS 1-6 2 - 1K ohm resistors in ANALOG I/O series with center tap Center NT CALIBRATE - GDP-32 Top view of plug Use this hookup for proper polarity. Date: 05-30-01 Section 19, Page 15 October 2002...
Page 408 GDP-32 INSTRUCTION MANUAL NT-32 NANOTEM CALIBRATE SETUP 60 cm twisted- pair cable NanoTEM Cal Receiver Transmitter GDP-32 10 cm jumper cables NT 32 NanoTEM Transmitter CAL+ TX OUTPUT CAL- 2 - 1K ohm resistors in CURRENT SENSE 1V/A series with...
Page 409 FAST TRANSIENT ELECTROMAGNETICS PROGRAM NANOTEM CALIBRATOR DECAY TRANSIENT A (top): 1.2 us sample interval, B (bottom): 1.6 us sample interval. Section 19, Page 17 October 2002...
Page 410: Nanotem Field Setup
INPUT on GDP CHANNELS 1-6 2 - 1K ohm resistors in ANALOG I/O series with center tap Center NT SETUP - GDP-32 Top view of plug Use this hookup for proper polarity. Date: 05-30-01 October 2002 Section 19, Page 18...
Page 411 FAST TRANSIENT ELECTROMAGNETICS PROGRAM NT-32 FIELD SETUP Section 19, Page 19 October 2002...
Page 412: Equal-Interval Mode, Nanotem
INSTRUCTION MANUAL 19.10 EQUAL-INTERVAL MODE, NANOTEM General A version of the NanoTEM program that runs on the Zonge GDP-32 receiver permits NanoTEM transients to be uniformly sampled and stored as time series to the hard disk. The window parameter may be toggled between...
Page 413 2. Turn on the GDP-32 and run Windows. 3. If using the LAN, you may have to re-configure the network parameters in the GDP-32 to be compatible with your network. 4. If using the serial port, HyperTerminal is the recommended program to use. You will have to ensure that the two serial ports are configured identically.
Page 414: Configuring Ports
SERIAL I/O PARAMETERS Option 3 of the Data Mode Main Menu sets the protocols for transferring data to a computer via the RS-232 serial port. The GDP-32 uses a standard XON, XOFF software handshake protocol. For complete information on transferring data see Section 19.12 below.
Page 415 The current port status is displayed above the Data Mode Main Menu: Parallel Port Disabled NOTE: Before the parallel port can be enabled the GDP-32 must be connected to an on-line printer via the parallel port.
Page 416: Outputting Data
Before outputting data, be sure to check the Serial Port configuration (see Section 19.11 above) 1. Attach the Serial I/O Cable between the serial port of the GDP-32 and the serial port connector on your computer.
Page 417: S Oftware
Waiting is displayed as the software handshake takes over until the printer catches up. 8. When the transfer is complete, the data stops printing and the GDP-32 returns to the Data Mode Main Menu.
Page 418 2. Connect the GDP-32 to the LAN using the multi-function interface cable. NOTE: This is a special cable supplied by Zonge Engineering (P/N: GDP-32/2-ACC). 3. Start the GDP and get into Windows. 4. The GDP-32II is configured by default to have no password. It is also set to obtain its IP address automatically.
Page 419 GDP-32 GDP-32 Multifunction Receiver Multifunction Receiver OPERATION MANUAL OPERATION MANUAL...

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