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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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Содержание PS1502B

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

Страница 2: ...er 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 damages Products may not be returned without prior authorization To obtain a Returned Materials Authorization RMA contact CAMPBELL SCIENTIFIC INC phone 435 753 2342 After an applications engineer determ...

Страница 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 Measurements in Table 2 with Analog Measurements in Table 1 10 TABLES 3 1 SDM Addresses 4 4 1 Waveform Resolution Determined by Probe Length 7 FIGURES 2 1 TDR System Components 2 3 1 Address Switch on S...

Страница 4: ...l 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 attached directly to twin lead cable The two rod probe and the twin lead cable that attaches to it carry a balanced signal the signal travels on both leads The 1502B has a 50 ohm coax connector coax...

Страница 5: ...connection 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 21X An additional control port is used to switch power to the 1502B ENC TDR Enclosure to hold 1502B and datalogger The ENC TDR includes a transient suppressor and cabling for connecting the power supp...

Страница 6: ...ress 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 The addresses are in base 4 Table 3 1 for example if the SDM1502 address is 22 the addresses for level one level two and level three multiplexers are 23 30 and 31 respectively The address for the SDM15...

Страница 7: ...R 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 SDM communication cables from the SDM1502 and SDMX50 to the datalogger With the 21X the C1 connection from the SDM1502 must be wired into analog input 1H with a 10 kilohm resistor to C1 This resisto...

Страница 8: ...ted 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 supplied screw and star washer Figure 3 5 The two rods of the probe are pressed into the soil with the rods parallel The cable leads allow the common 5 centimeter rod spacing The cable on the probe has a BN...

Страница 9: ...as 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 calculating water content or storing raw waveform data the starting point and time resolution of the raw waveform Instruction 100 may also be used to step through the multiplexers while manually con...

Страница 10: ...probe 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 using a propagating velocity of 0 99 the speed of light Vp 0 99 When capturing the waveform for raw output or calculating water content the cursor start of probe is placed 1 division into the 1502B di...

Страница 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 this into account Switching power to the 1502B is valuable not only for the conservation of batteries it also allows the 1502B to be reset if it should bomb If the 1502B or 1502C does not respond corr...

Страница 12: ...lows 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 If time is 01 0 minutes into a 02 60 minute interval 03 10 Set high Flag 0 output 02 P77 Real Time 01 110 Day Hour Minute 03 P86 Do 01 44 Set high Port 4 04 P22 Excitation with Delay 01 1 EX Chan 02 ...

Страница 13: ...led 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 into a 02 30 minute interval 03 30 Then Do 02 P92 If time is 01 0 minutes into a 02 240 minute interval 03 11 Set high Flag 1 03 P86 Do 01 44 Set high Port 4 04 P100 SDM 1502 01 22 Address 02 0 Moistur...

Страница 14: ...ing 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 Time Domain Reflectometry Journal of Hydrology 88 319 328 Topp G C J L Davis and A P Annan 1980 Electromagnetic Determination of Soil Water Content Measurements in Coaxial Transmission Lines Water Reso...

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