DSP-4000 Series
Users Manual
3-26
Resistance
The resistance test measures the loop resistance of the cabling and the terminator.
If a terminator is not connected or if the cabling is open, the resistance value is
reported as OPEN. If the cabling 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
cabling, the test tool cannot measure the length of terminated coaxial
cabling.
The length test measures the length of the cabling 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 cabling 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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