4.8 Typical Cable V.P and Impedance Values
Type
Vp
Z
Type
Vp
Z
Cat5 STP
72
100
T/Pair Jelly PE
64
100
Cat5 UTP
70
100
T/Pair PE
67
100
Coax Air
98
50/75
T/Pair PTFE
71
100
Coax Air Space
94
50/75
T/Pair PVC
58
100
Coax Foam PE
82
50/75
T/Pair Paper 72nF
88
100
Coax Solid PE
67
50/75
T/Pair Paper 83nF
72
100
4.9 How to determine Vp settings
If the TDR TX Ranger is to be used with a cable type for which the Vp is
unknown, this must first be determined.
1.
Take a sample of the cable at least 100m or 300ft long.
2.
Measure the actual length of cable using a rule or tape
measure, or some other reliable method.
3.
Connect the TDR TX Ranger and adjust the Vp setting such
that the tester gives a correct reading of the sample length.
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Summary of Contents for TX RANGER
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