between two features is to be made in ZOOM mode, position cursors at the relevant positions,
then ZOOM and make any fine adjustments as necessary. The readout is always the distance
between the cursors, even if one is not on the screen. Since expansion takes place around the
live (solid) cursor, the ZOOM facility can be activated by either the left or right cursor by moving
the relevant cursor and thereby making it solid.
7.7.3 RESETTING THE LH CURSOR
The LH cursor may be reset to `0' for normal measurements by switching the unit off and on.
Note that the instrument is calibrated such that cable lengths are measured from the co-ax
socket. Due to the internal wiring of the instrument, this may result in the left hand cursor being
set a short distance into the displayed transmit pulse, especially on the short pulses. This is
correct and ensures accurate cable length measurements.
7.8 FIND FAULT – ENSURE RANGE SETTING IS FULL AND NOT EXPANDED (ZOOM)
The “FIND FAULT” function is a means whereby the unit will automatically scan a cable and
locate the nearest significant feature and configure the parameters of the unit to optimally
display the feature.
Pressing the key a second or subsequent time locates the next significant feature along the
cable.
It is essential that the PVF is set to the value appropriate to the cable type in order that distance
measurements are accurate (see Section 7.4).
Radiodetection Ltd. 00901209-6
T631 OPERATING MANUAL 30
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