7.
OPERATING INSTRUCTIONS
7.1
GENERAL
For correct operation the cable under test should be taken out of service with all sources of
supply removed. If this is not possible and the cable is energised or likely to become energised
then the blocking filter accessory should be used.
RF signals present on telecommunications cables may corrupt the display.
7.2
SWITCH-ON
Power the unit from previously charged internal batteries or from the AC adaptor, or external DC
source.
Press the on button and the display should appear.
Rotate the contrast control if necessary to obtain a well defined trace.
On receipt from the factory the unit will power up in the LIVE cable mode, on the 6 m range, with
the distance read out in metres, a propagation velocity factor (PVF) of 0.667 and impedance 75
Ω
.
The left hand cursor, (dotted), will be at the start of the transmitted pulse (0 m). The right hand
cursor, (solid), will be approximately one third of the way across the display.
T631 OPERATING MANUAL
21
Radiodetection Ltd. 00901209-6
