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Cable measuring example

TransmitterTransmitter

R3R4

20m

40m

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Step 1 Signal Delay Factor of Used Cable

Use the Signal Delay Factor that is specified by the

manufacturer of the cable.

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30m 20m

R1=30m

R2=30+20=50m

R3=20m

R4=20+40=60m

40m

20m

20m

30m

Step 2 Measure the Cable Lengths

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R1=30 * 5.6 = 168ns

R2= 50 * 5.6 = 280ns

R3=20 * 5.6 = 112ns

R4=60 * 5.6 = 336ns

Step 3 Cable lengths * Cable Delay Factor

(Example)Cable Signal Delay

=5.6 ns/m

R4=60 * 5.6 = 336ns

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Step 4 Calculate Delay Switch Positions

(336 – 168) / 33 = 5.39

Switch Position =

(Max. Signal Delay – Delay Rx) / 33

(336 – 280) / 33 = 1.69

(336 – 336) / 33 = 0

(336 – 112) / 33 = 6.78

5

2 0

7

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Cable measuring example

End of section