22 Copper tests
ARGUS 152
317
Wire types (6):
The absolute VoP value must always be less than 1. However, ARGUS always displays
this in percent. In a wire with a VoP value of 0.7, a signal propagates at 70 % of the speed
of light (c
0
).
For many cable types, the pulse time is also specified in V/2: V/2 = VoP [%] * 1.5. In this
example, the V/2 value would come to 95.5 m/µs for a VoP of 0.637 resp. 63.7 %.
A typical patch cable has e.g. a VoP of 0.667 resp. 66.7%, which corresponds to a V/2 of
exactly 100 m/µs.
To measure e.g. building wiring precisely, it is important to set the correct VoP
value. You can determine the correct VoP using a reference cable of known length
before the measurement.
Impedance (8):
Using the impedance setting, it it possible
to adjust to the optimal impedance level.
We recommend the setting especially for
short cables to prevent selfreflections.?
Default:
135
Ω
This option is only available with the
option Advanced TDR.
Averaging (9):
The average value is formed from up to 20
single measurements. Averaging
eliminates irregularities caused especially
at high gains and disturbed lines. It helps
to interpret test results much better.
