Applied Physics Systems 751 User Manual
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Applied Physics Systems 751 User Manual

Natural gamma sensor
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DOC PN: 260-0222
MODEL 751

NATURAL GAMMA SENSOR

USER MANUAL

DOC DESC: Model 751 User Manual
CONTACT US
HEADQUARTERS
425 Clyde Avenue Mountain View, CA 94043
OFFICE
650.965.0500
EMAIL
info@appliedphysics.com
APPLIEDPHYSICS.COM
1
APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM
JULY 2022. REVISION: 03

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Summary of Contents for Applied Physics Systems 751

  • Page 1: Natural Gamma Sensor

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 MODEL 751 NATURAL GAMMA SENSOR USER MANUAL CONTACT US HEADQUARTERS 425 Clyde Avenue Mountain View, CA 94043 OFFICE 650.965.0500 EMAIL info@appliedphysics.com APPLIEDPHYSICS.COM APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM...

  • Page 2: Copyright

    DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 COPYRIGHT Copyright 2014 - 2022 Applied Physics Systems Incorporated. All Rights Reserved. The contents of this manual may not be reprinted in part or whole without permission. The contents of this manual are subject to change without notice.

  • Page 3: Table Of Contents

    36 HEX) ......... 16 6.2.2 - ASCII ACCELEROMETER COMMAND (KEYBOARD COMMAND 7, 0 37 HEX) ..... 16 6.2.3 - ASCII SEND 751 CONFIG DATA COMMAND (KEYBOARD COMMAND R, 0 72 HEX) 17 6.3 - MODEL 751 CONFIGURATION COMMANDS ..................18 7 - CORRECTIONS TO THE GAMMA COUNT RATE FOR USE IN MWD SYSTEMS ......
  • Page 4 Table 5. Binary Count Command Format Example Key ............... 13 Table 6. Rate Command Format Example Key ................... 14 Table 7. Model 751 Send Command Format Example Key ............17 Table 8. Model 751 Operation Configuration Commands ............18 Table 9. NET Packet Key ............................. 24 Table 10.

  • Page 5: Introduction

    (such as shales). The Model 751 gamma sensor can be used as either a standalone system or in conjunction with Model 750, 760, or 850 directional sensors: When used as a standalone system, communication with the Model 751 •...

  • Page 6: System Specifications

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 2 - SYSTEM SPECIFICATIONS This section describes the system specification for the Model 751 Gamma Sensor. Table 1. Model 751 Gamma Sensor Specifications Electrical Input Voltage Range...

  • Page 7: Mechanical Features

    JULY 2022. REVISION: 03 3 - MECHANICAL FEATURES A drawing of the Model 751 Sensor is shown in Figure 1. When used in pulser or EM MWD systems, usually the Model 751 is mechanically connected directly to a Model 750, 760, or 850 directional sensor and mounted in a cylindrical pressure barrel.

  • Page 8: Figure 2. Model 751 Mating Connector

    DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 Figure 2. Model 751 Mating Connector The drawing below is an assembly drawing of a Model 751 gamma sensor. Figure 3. Model 751 Sensor Assembly Drawing APPLIED PHYSICS SYSTEMS, INC. | APPLIEDPHYSICS.COM...

  • Page 9: Electrical Interface

    Not used Communication with the Model 751 is accomplished via the TTL-level serial communications lines. The Model 751 can be connected to a PC for testing if a TTL-to-RS232 conversion box is inserted in the communication lines between the Model 751 and PC. TTL-to-RS232 conversion systems can be supplied by Applied Physics Systems or other vendors.

  • Page 10: Data Interface

    9600 using 8-bit data words with one stop bit and no parity bit. An easy method of communicating with the Model 751 is to use a PC running a terminal emulator program such as Windows HyperTerminal or ProComm. When...

  • Page 11: Model 751 Gamma Sensor Commands

    • Configuration commands • To send a data request command to the 751 system, enter the command token <Ctrl/F> (pressing the Ctrl key and the f key simultaneously) followed by one of the keyboard commands listed in Table 3. Press Enter to send the command.

  • Page 12: Model 751 System Binary Data Request Commands

    0x74 Send temperature data 0x21 Send software version 6.1 – MODEL 751 SYSTEM BINARY DATA REQUEST COMMANDS This section describes the binary commands (keyboard commands 0, 1, and 2) in Table 3. 6.1.1 - ID COMMAND (KEYBOARD COMMAND 0, 0x30 HEX) The data in this command is the ASCII string "01Gamma 004"...

  • Page 13: Binary Count Command

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 Table 4. ID Command Format Example Key Contents Description 06 30 Header is the token and echoed command 30-61 This sequence spells out 01Gamma ASCII space 30 30 34...

  • Page 14: Binary Rate Command

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 00 00 01 D2 The count. 00 00 01 D2 Hex = 466 Decimal, so the rate is 466/14.74=31.61 Counts/sec. 01 01 Two maximum accelerations recorded since receipt of the last command.

  • Page 15: Binary Transmission Decoding Convention

    <Token>s result from expanding the <Token> in the CRC and the third represents the “real” token which indicates the end of the packet. 6.2 – MODEL 751 SYSTEM ASCII DATA REQUEST COMMANDS This section describes the ASCII commands (keyboard commands 6, 7, r, and so on) in Table 3.

  • Page 16: Ascii Rate Command (Keyboard Command 6, 0 36 Hex)

    273 so the rate is 273/10.2=26.8 cps. When the ASCII rate command is received the 751 sensor responds by sending the time and number of counts since the last ASCII rate command. The time and count values are then zeroed so that time and count accumulation can restart.

  • Page 17: Ascii Send 751 Config Data Command

    T_X2:+0.00002500 T_X1:-0.00350000 T_X0:+1.07000005 TempScale(degree/count):+0.12130 TempOffset(degree c):+273.0 Cal:+25.0 Pulseout mode: Uncorrected The table below explains the contents: Table 7. Model 751 Send Command Format Example Key Contents Description APS SNG0001 APS Gamma serial number Gamma Autosend Delay Autosend inter-packet delay time...

  • Page 18: Model 751 Configuration Commands

    Enter key. The Model 751 system has 22 configuration commands. Many of these commands should only be used during the calibration of the Model 751 system. See Appendix A - MODEL 751 CONFIGURATION COMMAND REFERENCE for a complete list of configuration commands.

  • Page 19: Corrections To The Gamma Count Rate For Use In Mwd Systems

    7 - CORRECTIONS TO THE GAMMA COUNT RATE FOR USE IN MWD SYSTEMS When the 751 sensor is used in drilling applications it is generally mounted in a beryllium copper pressure vessel and deployed in a (usually nonmagnetic) drill collar. In addition, drilling fluids (“drilling mud”) is present in the borehole being drilled.

  • Page 20: Pressure Barrel Correction (Pb Correction)

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 7.1 - PRESSURE BARREL CORRECTION (PB CORRECTION) The following two graphs show pressure barrel correction factors using inch and centimeter units. Figure 5. Pressure Barrel Correction Factors in Inches...

  • Page 21: Drill Collar And Drilling Fluid Correction (Cm Correction)

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 Figure 6. Pressure Barrel Correction Factors in Centimeters If a pressure barrel is manufactured with a metal other than beryllium copper (density 8.2 gram/cm³) then the PB correction factor should be multiplied by the ratio of the density of the new metal divided by the density of beryllium copper.
  • Page 22 DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 Collar ID (cm), cid Collar OD (cm), cod Bit diameter (cm), bit Mud density (gram/cm), md Collar density (gram/cm), cd The BF is given by the following equation: BF=(7 + (md * (cid-4.445)/2)) + (cd*(cod-cid)/2) +(md*(bit-cod)/2)

  • Page 23: Net Systems

    CM*PB = 6.53 8 - NET SYSTEMS The Applied Physics Systems .NET protocol is based on a polled protocol and is implemented by means of a two-wire serial data link, which is connected in parallel to all auxiliary sensors. Information is transmitted in packets, which carry both data and an identification of the sensor from which the data comes.

  • Page 24: Net Packet Description

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 baud using a ten bit word consisting of one start bit, eight data bits and one stop bit. To enable NET operation, the Model 760 or Model 850 system mode must be configured for autosend NET operation.

  • Page 25: Net Protocol

    DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 This string of bytes is transmitted as: <0x01> <0x73> <0x06> <0x06> <0x19> <0x06> <0x06> <0x06> <0x06> <0x56> Note that the double token becomes four tokens, each pair in the transmitted string representing one token in the original message.

  • Page 26: The Crc Program

    An example of a command response from the Model 751gamma sensor is shown below. The data request command sent by the NET master (usually a directional sensor) to the 751 system is two bytes: <06> <0x31>. The response is of the form: <0x06> <0x31> <Time> <Count> <mx> <my> <CRC> <0x06><0x04>...
  • Page 27 DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 CRC itself is used to update the CRC being computed. If there are no errors the resulting CRC should be 0. The program can be written as a single-line C program: void CalcCRC16(char c) crc = ((WORD)((crc >>...

  • Page 28: A - Model 751 Configuration Command Reference

    DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 A - MODEL 751 CONFIGURATION COMMAND REFERENCE A complete listing of the Model 751 configuration commands is shown in Table 11 below. Table 11. Model 751 Configuration Commands Keyboard Command Result...
  • Page 29 DOC PN: 260-0222 DOC DESC: Model 751 User Manual JULY 2022. REVISION: 03 There are two Help commands, ch and wh. Below are samples of the Help output: • Configuration Command Help With Config Parameter, Command: 'contrl+f''c''x''parameter' (contrl+f means hold down control key and type f key)

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