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Autotest
Autotest Results for Coaxial Cable
3
3-25
Resistance
The resistance test measures the loop resistance of the cable and the terminator. If
a terminator is not connected or if the cable is open, the resistance value is
reported as
OPEN
. If the cable or the terminator is shorted, the resistance value is
reported as near 0
Ω
. Resistance values over 400
Ω
are reported as
OPEN
.
Length
Note
Because a cable terminator eliminates signal reflections in coaxial
cable, the test tool cannot measure the length of a terminated coaxial
cable.
The length test measures the length of the cable when a terminator is not
connected. If a terminator is connected, the result of the length test is reported as
NO
REFLECTION
.
A
PASS
result means that the measured length is within the limit specified by the
selected test standard. A
FAIL
result means that the measured length exceeds the
limit.
Notes
Differences between measured and actual values of cable length can
be caused by variations in the cable’s NVP value. NVP values can
vary among cable types, lots, and manufacturers. To ensure
maximum accuracy of length measurements, perform an NVP
calibration as described in Chapter 6.
Anomaly
This result is shown at the bottom of the screen only if an impedance anomaly is
detected. The test tool reports an anomaly if 10% or more of the test signal is
reflected. The result shows the distance to the largest anomaly detected.
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