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CAMPBELL SCIENTIFIC

TDR SOIL MOISTURE MEASUREMENT

SYSTEM MANUAL

REVISION: 2/92

COPYRIGHT (c) 1991, 1992 CAMPBELL SCIENTIFIC, INC.

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Summary of Contents for TDR

Page 1: ...CAMPBELL SCIENTIFIC TDR SOIL MOISTURE MEASUREMENT SYSTEM MANUAL REVISION 2 92 COPYRIGHT c 1991 1992 CAMPBELL SCIENTIFIC INC...

Page 2: ...r warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential dam...

Page 3: ...INSTRUCTION 100 6 5 CALIBRATION FOR WATER CONTENT 7 6 PROGRAMMING EXAMPLES 8 6 1 Example 1 Measure and Record Every Hour 8 6 2 Example 2 Hourly Average Using Topp s Calibration 9 6 3 Example 3 TDR Mea...

Page 4: ...Module The Tektronix 1502C will also work but cannot use the PS1502B for controlling power 1 2 PROBES AND CABLES The simplest soil probe consists of two parallel rods inserted into the soil These are...

Page 5: ...onnection between datalogger and multiplexers 21X or CR10 The datalogger communicates with the 1502B and multiplexers with the SDM interface using control ports 1 3 and single ended channel 1 on the 2...

Page 6: ...ess is 1 greater than that of the SDM1502 All level 2 multiplexers have the address set to that of the SDM1502 plus 2 and all level 3 multiplexers have the address set to that of the SDM1502 plus 3 Th...

Page 7: ...enclosure by removing the handle the required Allen wrench is included with the ENC TDR and installing as shown in Figure 3 3 3 3 DATALOGGER WIRING 3 3 1 SDM Wiring Figure 3 4 shows the wiring of the...

Page 8: ...ed to control port 4 3 4 SOIL PROBES The PB30 consists of two 30 centimeter stainless rods and a twinlead cable The probes are shipped without the cable attached The rods are attached with the supplie...

Page 9: ...s probes to be measured or to measure separate groups of probes on a single multiplexer Options in instruction allow finding a soil moisture probe automatically or specifying the distance to the probe...

Page 10: ...robe or 1502B cursor Enter 0 and the datalogger will automatically search for the soil probe This length is not the actual length as measured with a meter stick it is the distance the 1502B measures u...

Page 11: ...on the first pass when finding the probe and 15 to 20 seconds each on subsequent measurements The program must be written so that analog measurements output intervals other time based decisions take t...

Page 12: ...ows the coefficients for the polynomial to be scaled so all significant digits can be entered in the polynomial Instruction 55 1 Table 1 Programs 01 900 Sec Execution Interval Every 15 minutes 01 P92...

Page 13: ...ed interval even while the TDR measurements are made in Table 2 because Table 1 can interrupt Table 2 01 P End Table 1 2 Table 2 Programs 01 60 Sec Execution Interval 01 P92 If time is 01 0 minutes in...

Page 14: ...ng Soil Moisture Measurement by Time Domain Reflectometry Soil Science Society of America Journal 54 1 6 Ledieu J P DeRidder P DeClerck and S Dautrebande 1986 A Method of Measuring Soil Moisture by Ti...

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