The Temperature 2 Pressure Probe (T2P): Technical Manual

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PART 1:CDAQ AND THE SOFTWAREVersion 1.0 Page 409/21/2012
1.1. CDAQ & SOFTWARE OVERVIEWThe Integrated Ocean Drilling Program (IODP) built the CDAQ to be a flexible system for use with variabledownhole tools and data types. For this reason, they included a generic code for a data logging program(IODP1D.run). That code was modified to interface with the two pressure transducers and one thermistor onthe T2P. The CDAQ was also modified electrically. The user should become familiar with the physical CDAQand the proper operation of the system as a data logging program (T2PLOGGR.run).1.2. CDAQ DESCRIPTIONThe CDAQ (Fig. 3) is composed of a Persistor, a voltage source, and a circuit board, which houses twoanalog-to-digital converters. The cable emanating from the 15-pin mdm connection can take many formsand serve different purposes. The cable is a necessary component for the utilization of the CDAQ, but is nottruly a part of the system.1.2.1. PERSISTORFigure 3: CDAQ System (voltage source excluded)The Persistor is an open-market, single board computer (www.persistor.com). It contains a flash memorycard for storage of executables and data files, a microprocessor for interface with peripherals, and the abilityto execute programs. We use the CF-2 Persistor model with modifications made by the manufacturer. Theflash cards were originally removable, but are now directly attached to the rest of the board because thereare space constraints. The data logging program developed by UT, T2PLOGGR.run must be uploaded toany new Persistor purchased.1.2.2. CIRCUIT BOARDThe circuit board for the CDAQ (Fig. 3) contains all the necessary wiring between peripheral components,the Persistor, and internal elements. The main components on this board are the ADC chips (see below), anaccelerometer, and a low pass filter. The low pass filter is set to limit signal input in excess of ~52 kHz.Version 1.0 Page 509/21/2012
Page 1 and 2: The Temperature 2 Pressure Probe (T
Page 3: INTRODUCTIONThe University of Texas
Page 7 and 8: 1.3. OPERATION OF CDAQ1.3.1. KEY CO
Page 9 and 10: Figure 6: Command-Based PicoDos Sys
Page 11 and 12: CMD:17:42:45.04, 1327432.000 25.8 9
Page 13 and 14: 1.5. EXAMPLE OF LOGGING SESSIONThe
Page 15 and 16: 5. The file is ready to be received
Page 17 and 18: 8. The command starts data logging
Page 19 and 20: 11. The file is ready to be sent, b
Page 21 and 22: 15. The CDAQ data cable can be remo
Page 23 and 24: 1.6. CALIBRATIONCalibration of the
Page 25 and 26: 200000018000001600000S/N 13S/N 14S/
Page 27 and 28: 1.7. POST-PROCESSING OF DATATo acco
Page 29 and 30: 1.9. TEMPERATURE EFFECTSIn previous
Page 31 and 32: 1.10. SOFTWARE MODIFICATIONS TO IOD
Page 33 and 34: APPENDICESVersion 1.0 Page 3309/21/
Page 35 and 36: #8 nylon spacers 1/2" nylonCDAQCDAQ
Page 37 and 38: Greene Tweed wiring assembly15 pin
Page 39 and 40: 19 pin Fischer receptacleBack side1
Page 41 and 42: Drive tube wiring cable (straight)1
Page 43 and 44: End Cap Connector Plate3 pin Fische
Page 45 and 46: Version 1.0 Page 4509/21/2012
Page 47: IV. REFERENCESFlemings, P.B., Germa

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