7.5 CONNECTING TO CABLE UNDER TEST
Connect the cable under test directly to the BNC socket or via the test lead supplied.
Unless the LH cursor is movedto coincide with theend of the test lead, thedistance read out will
include the length of the test lead which must be subtracted from the reading obtained.
7.6 LOCATING A CABLE FAULT
Set the DIEL appropriate to the cable type (see Section 7.4). Select a RANGE to cover the full
cable length. Use “AUTO” Pulse Width selection unless a specific pulse width is preferred.
Adjust the AMP controls until the fault reflection is observed.
If the fault reflection is less than halfway across the screen select a shorter range and a
narrower pulse width for optimum results.
If there is no fault reflection there are two possibilities.
1. The cable length is longer than its recorded length.In this case increase the range until a
reflection is seen.
2. The fault is very close to the position at which the instrument is connected. In this case
reduce the range until a reflection is seen. In both cases, use may be made of the auto
fault find facility (see Section 7.8).
T631 OPERATING MANUAL 27
Radiodetection Ltd. 00901209-6
To Next Page