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CableIQ Qualification Tester
Users Manual
60
Calibrating Length Measurements
The tester uses an NVP value (nominal velocity of
propagation) and the signal delay through the cable to
calculate length. The tester’s default NVP values are
usually accurate enough to verify length; however, you
can increase the accuracy of length measurements by
adjusting the NVP to a specified or actual value.
The default NVP values are 70 % for twisted pair cable
and 82 % for coaxial cable.
Note
NVP values can vary among cable types, lots,
and manufacturers. In most cases, these
differences are minor and may be disregarded.
Setting the NVP to a Specified Value
To enter the NVP value specified by the manufacturer:
1 Disconnect twisted pair and coaxial cables from the
tester.
2 Turn the rotary switch to SETUP.
3 Use D to highlight Length Calibration; then press
H or J.
Note
You may disregard the message “Cabling too
short” when setting the NVP to a specified
value.
4 To set the NVP for coaxial cable, press K c.
5 Press H or J; then use D A to set the NVP
value.
6 Press H to save the NVP value.
70


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