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LRS SCINTREX AUTOGRAV CG-6 Operation Manual

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CG-6
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Autograv
Gravity Meter
OPERATION MANUAL
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CG-6 Operation Manual p/n 115370001 Rev A

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Summary of Contents for LRS SCINTREX AUTOGRAV CG-6

  • Page 1 CG-6 Autograv Gravity Meter OPERATION MANUAL CG-6 Operation Manual p/n 115370001 Rev A...
  • Page 2 Description of Rev. Date of Issue Change Initial Release 7113 July 19, 2016 CG-6 Operation Manual p/n 115370001 Rev A...
  • Page 3 SCINTREX LIMITED 222 Snidercroft Road Concord, ON, Canada L4K 2K1 Telephone: +1 905 669 2280 Fax: +1 905 669 6403 e-mail: scintrex@scintrexltd.com www.scintrexltd.com Copyright@SCINTREX Limited 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form, or by any means, electronic, mechanical, photo-copying, recording, or otherwise without prior consent from SCINTREX Limited.

  • Page 4: Table Of Contents

    Table of Contents Chapter 1 Instrument overview ................1—1 Chapter 2 Getting started ..................2—1 Chapter layout ....................... 2—1 Symbols ........................ 2—1 Unpacking the instrument ..................2—2 Location of the CG-6 Autograv sensor .............. 2—4 Overview of the components ................. 2—4 Assembling the batteries ..................

  • Page 5: Chapter 1 Instrument Overview

    Chapter 1 Instrument overview Figure 1-1 The CG-6 Autograv Gravity Meter The CG-6 Autograv is an automated gravity meter that has a worldwide measurement range of over 8,000 mGals and a reading resolution of 0.0001 mGal. This enables the user to operate in both, detailed micro-gravity surveys and large scale regional or geodetic surveys.
  • Page 6 The two internal Li-ion rechargeable batteries provide sufficient power to operate the CG-6 Autograv throughout a normal survey day. An external tablet computer allows the user to easily setup the CG-6 Autograv store the setup settings as well as plan and store the survey points. The tablet is pre- loaded with the LynxLG Land Gravity software that allows the user to quickly set up and plan the upcoming survey, remote recording and continuous monitoring of both gravity and tilt signals, and gives access to locational maps among its many functions.

  • Page 7: Chapter 2 Getting Started

    Getting started Chapter 2 Getting started Chapter layout Chapter Description 1. Overview Description of the instrument Gives an overview of the manual and 2. Getting started describes the instrument’s components. Tells how to set up your CG-6 3. Setting up Autograv for a survey.

  • Page 8: Unpacking The Instrument

    Getting started Figure 2-1 The CG-6 Autograv Gravity Meter and its transportation case Important: During shipment, the batteries must be removed from the instrument and stored separately. If you have just received your CG-6 Autograv , the batteries will have a charge of approximately 30% and be disconnected from the instrument.
  • Page 9 Getting started Figure 2-2 Location of the pressure release valve on the transportation case 4. Open the CG-6 Autograv transportation case by lifting the lid. 5. Remove the CG-6 Autograv from the transportation case by pulling directly upward on the black rubber handle and visually inspect for any physical damage that may have occurred during transportation.

  • Page 10: Location Of The Cg-6 Autograv

    Getting started Location of the CG-6 Autograv sensor The following picture shows the location of the CG-6 Autograv sensor. PROOF MASS POSITION 118.96 4.683 Figure 2-4 The CG-6 Autograv sensor location Overview of the components The following picture shows an overhead view of the all the components that are supplied with a standard CG-6 Autograv in its transportation case.
  • Page 11 Getting started CG-6 Autograv , a minimal amount of assembly is required to attach the battery holder assembly (p/n 126370001) to the smart batteries (p/n 0221029). The following pictures illustrates the assembly procedure: Note: The Allen screwdriver illustrated in the fourth frame (see next page) is supplied with the CG-6 Spare Parts Kit (p/n 888025).

  • Page 12: Overview Of The Console And Keypad

    Getting started Overview of the console and keypad The following picture shows the front panel of the instrument. It is comprised of a display for viewing menus and results; keypad for entering parameters and recording data. Bluetooth /GPS External GPS Antenna Mounting Point Enter Button...

  • Page 13: Powering Up The Cg-6 Autograv Tm

    Getting started Warm-up period: after you power up the CG-6 Autograv , it requires a 2 hour warm- up time in order to reach the operating temperature. Stabilization period: the instrument requires a 24 hour period after you power up to stabilize.

  • Page 14: Charging The Cg-6 Autograv

    Getting started Figure 2-9 The CG-6 Autograv and batteries If the batteries are in place when the external power supply is connected, the power supply will power the unit and also charge the batteries if necessary. When the batteries are fully charged the supply powers the unit so that the batteries maintain their full charge.

  • Page 15: Chapter 3 Setting Up Your Cg-6 Autograv

    Setting up Chapter 3 Setting up your CG-6 Autograv Setting up the CG-6 Autograv The CG-6 Autograv is supplied with a tablet computer (p/n 140148) that allows the user to quickly set up and plan the upcoming survey using the LynxLG Land Gravity software which is pre-loaded in the tablet.

  • Page 16: Putting In To Sleep Mode; Shutting Off The Main Display

    Setting up The inclination of the X axis in arcseconds is displayed on the left-hand-side and the inclination of the Y axis in arcseconds is displayed on the right-hand-side. Putting in to sleep mode; shutting off the main display The CG-6 Autograv can be put into sleep mode;...
  • Page 17 Setting up Figure 3-3 The settings screen Adjusting the system settings To access the System screen, move your cursor to SYSTEM and press the Enter button. The following screen will appear: Figure 3-4 The system screen Adjusting the backlight The backlight of your screen can be set to ON or OFF. To adjust the backlight, move the cursor to Backlight and press the Enter button.
  • Page 18 Setting up Figure 3-5 The backlight screen The backlight can be set to On or Off. Move your cursor to either 1 or 2 and press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button. Adjusting the buzzer volume The volume of the buzzer can be set to either low, medium, high or disabled.
  • Page 19 Setting up Figure 3-7 The level window size editing screen Note: The level window size is the threshold under which the leveling arrows will appear as green. For instance, if the threshold is set to 20 arseconds, then once the tilt of one of the axes is within ± 20 arcseconds, then the leveling arrow for this axis will appear green.
  • Page 20 Setting up Figure 3-8 The auto contrast screen To set the auto contrast to On or Off. Move your cursor to either 1 or 2 and press the Enter button. Note: The auto contrast function should generally be left on at all times. The contrast will automatically be adjusted based on the lcd screen temperature.
  • Page 21 Setting up Note: If you enter a very high contrast offset value, you screen will be very dark. To enter the contrast offset value, move the cursor to the chosen character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.
  • Page 22 Setting up Figure 3-11 The year editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button. To clear the last character that was entered, move the cursor to the Backspace field and press the Enter button.
  • Page 23 Setting up To enter the day, move the cursor to Day and press the Enter button. The following screen will appear: Figure 3-13 The day editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.
  • Page 24 Setting up You will be returned to the system time editing screen. To enter the minutes, move the cursor to Minute and press the Enter button. The following screen will appear: Figure 3-15 The minute editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.

  • Page 25: Survey Settings

    Setting up field and press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button. You will be returned to the system time editing screen. To accept the new value of time, move the cursor to Accept and press the Enter button To return to the Settings screen, move the cursor to BACK and press the Enter button Survey settings To access the Survey screen, move your cursor to SURVEY and press the Enter button.
  • Page 26 Setting up The Survey Name can be any combination of 31 alphanumeric characters. To type the Survey Name, move the cursor to the chosen character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button. To clear the last character that was entered, move the cursor to the Backspace field and press the Enter button.
  • Page 27 Setting up Figure 3-20 The cycles screen Note: The number of cycles is defined as the number of times you successively repeat a reading at a given station. The Number of Cycles can be any value you choose between 1 and a large number of your choosing.
  • Page 28 Setting up Figure 3-21 The measure length screen The measurement length can be set to either 30 seconds, 60 seconds or 120 seconds. To exit this screen, move the cursor to CANCEL and press the Enter Entering a record delay value You can enter a record delay value, in seconds, which will delay the start of the recording of data.

  • Page 29: Viewing The Instrument Parameters

    Setting up You can choose to record the raw tsf file. Move the cursor to Record Raw tsf and press the Enter button. The following screen will appear: Figure 3-23 The tsf recording screen Move your cursor to either 1 or 2 and press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button.
  • Page 30 Setting up Figure 3-25 The GCAL1 editing screen The GCAL1 value is set at the factory and should not changed under normal circumstances. If however you choose to fine tune the GCAL1 value of your CG-6 Autograv , please refer to Chapter 7 Theory of Operation. To enter the new GCAL1 value, move the cursor to the chosen character and press the Enter button.
  • Page 31 Setting up press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button. Changing the temperature coefficient parameter To edit the temperature coefficient parameter, move the cursor to TEMP COEFF and press the Enter button. The following screen will appear: Figure 3-27 The temperature coefficient editing screen The temperature coefficient is a negative number between -0.1 and -0.2.
  • Page 32 Setting up The X Level scale can be any number between 0.025 and 0.035. To enter the X level scale value, move the cursor to the chosen character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button. To clear the last character that was entered, move the cursor to the Backspace field and press the Enter button.
  • Page 33 Setting up Figure 3-30 The Y level scale editing screen The Y Level scale can be any number between 0.025 and 0.035. To enter the Y level scale value, move the cursor to the chosen character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.
  • Page 34 Setting up Changing the value of your drift rate Warning: Changing the drift rate or the drift start time will result in a step in your data. To edit the value of your drift rate, move the cursor to DRIFT RATE and press the Enter button.
  • Page 35 Setting up Figure 3-33 The drift start time editing screen To enter the year, move the cursor to Year and press the Enter button. The following screen will appear: Figure 3-34 The year editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.
  • Page 36 Setting up Figure 3-35 The month editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button. To clear the last character that was entered, move the cursor to the Backspace field and press the Enter button.
  • Page 37 Setting up To enter the hour, move the cursor to Hour and press the Enter button. The following screen will appear: Figure 3-37 The hour editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.

  • Page 38: Instrument Corrections

    Setting up You will be returned to the drift start time editing screen. To enter the seconds, move the cursor to Second and press the Enter button. The following screen will appear: Figure 3-39 The seconds editing screen Move the cursor to the chosen field character and press the Enter button. To clear the entire field, move the cursor to the CLEAR field and press the Enter button.
  • Page 39 Setting up Figure 3-40 The instrument corrections screen Enabling or disabling the temperature correction To enable or disable the temperature correction, move the cursor to Temperature and press the Enter button. The following screen will appear: Figure 3-41 The temperature correction screen To set the temperature correction to On or Off.
  • Page 40 Setting up Figure 3-42 The drift correction screen To set the drift correction to On or Off. Move your cursor to either 1 or 2 and press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button. Enabling or disabling the tide correction To enable or disable the tide correction, move the cursor to Tide and press the Enter button.

  • Page 41: Performing A Drift Test

    Setting up Figure 3-44 The tilt correction screen To set the tilt correction to On or Off. Move your cursor to either 1 or 2 and press the Enter button. To exit this screen, move the cursor to CANCEL and press the Enter button. To return to the Settings screen, move the cursor to BACK and press the Enter button.
  • Page 42 Setting up Figure 3-45 The drift test screen Level your CG-6 Autograv as per Leveling the CG-6 Autograv on page 4-5. Once the leveling arrows are both green, you can proceed with the drift test. To start the drift test, move your cursor to START and press the Enter button. The CG-6 AutogravTM is now in the drift test mode.
  • Page 43 Setting up Figure 3-47 The drift test active screen following the first cycle To terminate the drift test, you can either let your CG-6 Autograv complete the drift test by itself after having completed the number of cycles, or move the cursor to END TEST and press the Enter button.
  • Page 44 Setting up Once your drift test has been completed, a drift file (with extension .drift) is automatically created. To retrieve this file please refer to Retrieving your data on page 4-7 for more details. The following caption illustrate the drift file in the memory of your CG-6 Autograv Figure 3-50 The drift file root folder The following caption illustrates a typical drift file:...
  • Page 45 Setting up To access the Tilt test screen, move your cursor to TILT CAL and press the Enter button. The following screen will appear: Figure 3-52 The level calibration test screen Level your CG-6 Autograv as per Leveling the CG-6 Autograv on page 4-5.
  • Page 46 Setting up Figure 3-54 The level calibration test screen in collecting mode, point 1 Your CG-6 Autograv is now collecting data. At the end of the cycle (30 seconds), the following screen will appear: Figure 3-55 The level calibration test screen at the end of the point 1 Level your CG-6 Autograv to 200 arcseconds on X and 0 arcseconds on Y and press the Enter button.
  • Page 47 Setting up Your CG-6 Autograv is now collecting data. At the end of the cycle (30 seconds), the following screen will appear: Figure 3-57 The level calibration test screen at the end of the point 2 Level your CG-6 Autograv to -200 arcseconds on X and 0 arcseconds on Y and press the Enter button.
  • Page 48 Setting up Figure 3-59 The level calibration test screen at the end of the point 3 Level your CG-6 Autograv to 0 arcseconds on X and 200 arcseconds on Y and press the Enter button. The following screen will appear: Figure 3-60 The level calibration test screen in collecting mode, point 4 Your CG-6 Autograv is now collecting data.
  • Page 49 Setting up Level your CG-6 Autograv to 0 arcseconds on X and -200 arcseconds on Y and press the Enter button. The following screen will appear: Figure 3-62 The level calibration test screen in collecting mode, point 5 Your CG-6 Autograv is now collecting data.
  • Page 50 Setting up Figure 3-64 The level calibration test screen in collecting mode, point 6 Your CG-6 Autograv is now collecting data. At the end of the cycle (30 seconds), the following screen will appear: Figure 3-65 The level calibration test screen at the end of the point 6 To accept the new tilt offset and scale values, move the cursor to ACCEPT and press the Enter button.

  • Page 51: System Information Of Your Cg-6 Autogravtm

    Setting up Figure 3-66 The level calibration file root folder The following caption illustrates a typical drift file: Figure 3-67 The level calibration file System information of your CG-6 Autograv To access the system information screen, move your cursor to INFO and press the Enter button.
  • Page 52 Setting up The system information screen displays the following: serial number of your CG-6 Autograv , the firmware version, the percentage of memory in use and the sensor temperature (in degrees C). Important: The factory menu is only accessible to Scintrex engineers. You have now completed the setup of your CG-6 Autograv 3—38 CG-6 Operation Manual p/n 115370001 Rev A...

  • Page 53: Chapter 4 Operating The Cg-6 Autograv

    Operating Chapter 4 Operating the CG-6 Autograv in the field By now you have familiarized yourself with your CG-6 Autograv and have properly configured it for your upcoming survey. This chapter reviews the basic steps required to carry out a survey. They include the following: •...
  • Page 54 Operating Figure 4-2 The station screen From this screen, you can create a new station or gravity point, which will have a station name, a latitude value, a longitude value, an elevation value as well as an instrument height value; used for the free air correction during the processing stage. Creating the station name The Station Name can be any combination of 31 alphanumeric characters.

  • Page 55: Retrieving The Pre-Set List Of Stations

    Operating Retrieving the pre-set list of stations The LynxLG Land Gravity software allows you to create a pre-set list of stations. Please refer to LynxLG Land Gravity software operation manual (p/n 115370002) for more details. From the main screen, move your cursor to STLIST and press the Enter button. The following screen will appear: Figure 4-3 The station list screen To choose a given station, move your cursor to the selected station and press the Enter...
  • Page 56 Operating The GPS status will appear as “SEARCHING”. Once a sufficient number of satellites is obtained, the Latitude, Longitude, Time, Date and Elevation fields will automatically be populated. The following screen will appear: Figure 4-5 The GPS active screen You can also refresh the current position of your CG-6 Autograv by moving your cursor to GET POS and pressing the Enter button.

  • Page 57: Taking A Measurement With The Cg-6 Autograv Tm

    Operating Figure 4-8 The GPS screen with locked time To exit this screen, move the cursor to BACK and press the Enter button. Taking a measurement with the CG-6 Autograv Placing the CG-6 Autograv on its tripod Place the CG-6 AutogravTM on its tripod as illustrated below. Figure 4-9 Placing the CG-6 Autograv on its tripod Leveling the CG-6 Autograv...

  • Page 58: Taking A Measurement

    Operating When the instrument is first placed on the tripod, the level arrows will likely be red or orange, depending on how far off-level the instrument is sitting. To level the instrument, rotate the adjustable knobs on the tripod in the direction indicated by the arrows until the lights turn green.

  • Page 59: Recalling Your Data

    Operating The duration of the reading is determined by the measurement CYCLE LENGTH and NUMBER OF CYCLES. If this has not yet been set up, please proceed immediately to Survey settings. Once the measurement cycle length and number of cycles have been reached, the leveling arrows will flash magenta and your data will automatically be stored in the flash memory of your CG-6 Autograv Note:...

  • Page 60: Retrieving Your Data

    Operating Retrieving your data Connect your USB-A to USB-B cable (p/n 200239) between the USB-B connector on your CG-6 Autograv and any UBS-A connector on your laptop or tablet. Figure 4-12 The CG-6 Autograv USB-B port From the main screen, move your cursor to USB and press the Enter button. The following screen will appear: USB Device Mode EXIT...
  • Page 61 Operating The file structure of your CG-6 Autograv is illustrated by the diagram below. Figure 4-14 File structure of a CG-6 Autograv Filtered Data File (.DAT) Filtered data file stores the filtered gravity readings and other measurements (standard deviation, X/Y levels, sensor temperature, etc.) at the frequency specified by the measurement cycle length you selected (30s, 60s or 120s).
  • Page 62 Operating Figure 4-15 Sample Filtered Data File from a CG-6 Autograv Raw TSF File (.tsf) A raw tsf file is a file that keeps the raw readings during your measurement. Each line of the file has a time stamp 10 raw gravity readings (ADC unit) raw X and Y level readings (ADC unit) raw temperature reading (ADC unit) tide correction (mGal)
  • Page 63 Operating Drift Test (.drift) and Tilt Calibration (.level) file A drift test file or tilt calibration file will be recorded during your drift test or tilt calibration. They have the same format as the filtered data file (.DAT), and can be found under your CG-6 root directory.

  • Page 64: Chapter 5 Maintaining Your Cg-6 Autograv

    Maintenance Chapter 5 Maintaining your CG-6 Autograv and troubleshooting Important: Care must be exercised in handling your CG-6 Autograv . Excessive shocks and vibrations should be avoided. Troubleshooting Despite the fact that your CG-6 Autograv is a very reliable instrument, there can be circumstances where problems may occur.

  • Page 65: Chapter 6 Reference Information

    Reference Chapter 6 Reference information CG-6 Autograv technical specifications Tablet and CG-6 Autograv specifications are subject to change without notice Sensor Type Fused quartz using electrostatic nulling Reading Resolution 0.1 microGal Standard Deviation <5 microGal Operating Range World-wide (8,000 mGal without resetting) Residual Drift <10 microGal/day Uncompensated Drift...
  • Page 66 Reference Shipping weight and dimensions 97cm x 60 x 55 (H) (38in x 24 x 22 (H)), 26 kg, (60 lb). Available Options and Accessories High-Temperature (HT) Meter Upgrade Cold Weather Survey Accessories Seco Backpack Spare Meter Batteries Spare Tablet Batteries Trident Gradient Tripod Spare Battery Holder Assembly Extended Legs Tripod...

  • Page 67: Instrument Parts List

    Reference Instrument parts list CG-6 Autograv Standard Accessories Item Description Part Number CG-6 Autograv includes: 101370001 CG-6 Autograv 129370005 Meter Tripod 126370037 Computer Tablet 140148 Battery Pack (x2) 0221029 Battery Holder Assembly (x2) 126370001 AC to DC Power Supply 128370015 Smart Battery Charger 0221020 USB-B to USB-A Cable...

  • Page 68: Repair

    Reference Repair When to ship the unit Please do not ship your instrument for repair until you have communicated the nature of the problem to our Customer Service Department by e-mail, telephone, facsimile or mail. Our Customer Service Department may suggest certain simple tests or steps for you to do, which may solve your problem without the time and expense involved in shipping the instrument back to Scintrex for repair.

  • Page 69: Chapter 7 Theory Of Operation

    Theory of Operation Chapter 7 Theory of operation XXXX 7—1 CG-6 Operation Manual p/n 115370001 Rev A...
  • Page 70 INDEX Gravity Reference, 3—16 Adjusting Auto contrast, 3—5 Instrument corrections, 3—24 Backlight, 3—3 Instrument parameters, 3—15 Buzzer volume, 3—4 Contrast offset, 3—6 Level screen window size, 3—4 Auto contrast, 3—5 Keypad, 2—5 Backlight, 3—3 Latitude, 4—2 Batteries, 2—4 Entering, 4—2 Battery Level calibration test, 3—30 Capacity, 3—1...
  • Page 71 Retrieving your list of stations, 4—3 Taking a measurement, 4—5 Technical Specifications, 6—1 Temperature coefficient, 3—17 Scintrex Temperature correction, 3—25 Office, 6—3 Tide correction, 3—26 Sensor Tilt correction, 3—26 Location, 2—4 Time, 3—1 Setting up, 3—1 Trouble Shooting, 5—1 Settings, 3—2 tsf file, 3—14 Drift test, 3—27 Level calibration test, 3—30...

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