Having obtained the display the parameters may then be altered if required.
This feature is intended for use on coaxial cables where the reflection from a fault may be quite
small, so the sensitivity used is quite high. On a power cable or twisted pair telephone cable,
mismatches due to joints, or change of cable type may give rise to many reflections which the
instrument will detect even though they are not faults.
7.8.1
OPERATION
The FIND FAULT function starts at the location of the RH cursor and searches to the right.
Therefore for a full search the RH cursor should first be placed just to the right of the transmit
pulse.
Pressing the FIND FAULT key will start the search. This may take several seconds. While
searching, “AFF” is displayed in place of the usual mode display.
Searching is carried out on all ranges from the one appropriate to the starting cursor position
(6 m range if the cursor starts on zero) to 12 Km. Gain and Pulse Widths appropriate to the
range are used.
When a fault is found, the unit will beep twice and place the RH cursor just before the fault. If no
fault is found the unit will beep 4 times, and return to the original conditions.
Pressing FIND FAULT again will cause the next fault to be found. Note that “FIND FAULT” may
change the machine settings.
T631 OPERATING MANUAL
31
Radiodetection Ltd. 00901209-6
