Campbell TDR Spezifikationen PDF herunterladen (Seite 17)

Appendix A. Discussion of TDR Probe Offset and a Simple Laboratory Method for Calculation

• converting waveform index to apparent distance

thWindowLeng

1datapoints

start

:start

index

distance

⋅

−

thWindowLeng

1datapoints

end

:end

index

distance

⋅

−

65.0start

distance

4.3end

distance

(

)

distancep

endV

distance

startLa

:obeOffsetPr

−

⋅

−

tProbeOffse

086.0

TABLE A-1. Dielectric permittivity

values for range of temperatures.

From equation [A5].

Temperature (°C)

Dielectric

Permittivity

15 82.23

15.5 82.04

16 81.85

16.5 81.67

17 81.48

17.5 81.29

18 81.1

18.5 80.92

19 80.73

19.5 80.55

20 80.36

20.5 80.18

21 79.99

21.5 79.81

22 79.63

22.5 79.44

23 79.26

23.5 79.08

A-5

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 25 26

TDR Probes CS605, CS610 1
CS630, CS635, CS640, CS645 1
Warranty and Assistance 2
TDR Probes Table of Contents 3
List of Tables 4
List of Figures 4
CS635, CS640, CS645 5
3. Specifications 6
4. TDR Probe Description 6
4.2 Installation 7
Conductivity 9
6. References 11
This is a blank page 12
Connecting Cables 14
() () () ( 15
() () () () 16
B.1 Description of Method 19
Shorted 20
B.2.2 Determining K 20
35.095.001.0 σ∗+σ∗+=σ 21
Values 22

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