DSP-100/2000
Users Manual
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 0Ω. Resistance values over 400Ω 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. To ensure maximum accuracy of length measurements, perform an NVP calibration as described in Chapter 6.
The length test limits include an extra 10% to account for variations in NVP.
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.
