Campbell TDR100 Manuel d'instructions télécharger pdf (Page 4)

TDR100 Table of Contents

5.8 Soil Probes ............................................................................................. 17

5.8.1 Determining Probe Constant, K

, using PCTDR.......................... 18

6. Datalogger Instructions for TDR Measurements ....18

6.1 CR10X and CR23X Datalogger Instruction 119 ................................... 18

6.2 Discussion of TDR Instruction Parameters (Instruction 119)................ 19

6.2.1 Parameter 1: SDM address.......................................................... 19

6.2.2 Parameter 2: Output Option ........................................................ 19

6.2.3 Parameter 3: Multiplexer and Probe Selection............................ 20

6.2.4 Parameter 4: Waveform Averaging............................................. 20

6.2.5 Parameter 5: Relative Propagation Velocity ............................... 21

6.2.6 Parameter 6: Points...................................................................... 21

6.2.7 Parameter 7: Cable Length (meters)............................................ 21

6.2.8 Parameter 8: Window Length (meters) ....................................... 21

6.2.9 Parameter 9: Probe Length (meters)............................................ 21

6.2.10 Parameter 10: Probe Offset (meters)......................................... 22

6.2.11 Parameter 11: Input Location.................................................... 22

6.2.12 Parameter 12: Multiplier ........................................................... 23

6.2.13 Parameter 13: Offset.................................................................. 23

6.3 CR1000 Datalogger Instruction “TDR100”........................................... 24

7. TDR Principles ...........................................................26

8. Cable Length and Soil Electrical Conductivity

Effect on Water Content Determination................27

8.1 Cable Length Effect on Water Content Measurement ........................... 27

8.2 Soil Electrical Conductivity Effect on Water Content Measurement .... 28

9. Programming Examples............................................30

9.1 CR10X/CR23X Program Example ........................................................ 30

9.2 CR1000 Program Example .................................................................... 44

10. References................................................................47

Figures

3-1 Waveform of a CS610 in water ............................................................... 5

3-2 Waveform of CS610 in water after changing Start and Length parameters

to display relevant portion of reflected signal ..................................... 6

4-1 PCTDR waveform for CS610 in water.................................................. 10

5-1 TDR System Components ..................................................................... 11

5-2 Terminal Strip Adapters for Connections to Battery............................. 12

5-3 SDMX50 signal attenuation .................................................................. 16

5-4 Location of Address Jumpers on SDMX50........................................... 17

1 2 3 4 5 6 7 8 9 ... 55 56

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Campbell TDR100 Manuel d'instructions Page 4