2
Cable Fault Location System Aerial Fault Location QR V 1.2
Receiver Setup
1.
Connect the DHC-100 or other compatible hand coil, to the receiver.
2.
Turn on the receiver and select
Aerial [F1]
or
[F3]
Aerial SP
from the main
screen.
3.
Select
[F1]
to highlight
Freq
on the display if needed. Use
↓
[F2]
or
↑
[F3]
to
select the frequency matching the transmitter.
4.
Place the coil on the cable at least ten feet from the transmitter. Press
[F1]
to
select
Gain
and use
↓
[F2]
or
↑
[F3]
to adjust the gain and obtain a reading of
70% to 90%, as indicated on the display. Adjust the transmitter power
[LEVEL]
setting, if necessary, to obtain this reading. A different frequency
[FREQ]
may
also be used if needed.
5.
Adjust
Volume
to a comfortable level. A headphone may also be connected if
desired.
6.
Press
[F3]
for Natural or Simulate Sound. Select the Sound that is the most
desirable to the user.
L
OCATING THE
F
AULT
1.
Sample the cable at intervals. With the hand coil on the cable, scan a 3’ to 4’ area
and find the peak signal.
2.
Monitor the signal amplitude on the receiver display and sound from the speaker.
The signal indication/volume will rise and fall as the hand coil is moved along the
cable. This is due to the twist in the cable. The fault location is indicated by a
significant
DECREASE
in signal after passing the fault for a SHORT or CROSS. A
SPLIT produces a significant
INCREASE
in signal when passing the fault.
3.
If the signal is present and no significant change in strength, move to the next
location closer to the fault.
4.
The hand coil can be moved back to the transmitter side to confirm the fault
location.
5.
If the fault cannot be identified, repeat the location process with the next lower
frequency on the transmitter and receiver and/or increase the power level at the transmitter or use the Aerial SP
mode.
6.
In addition to the indications described above, when using
Aerial SP
mode, use
the
PS:
indication,
arrows
, and the
blocks
at the bottom of the graph as an
additional aid for determining fault location.
a.
Before the fault:
PS:
≤
80,
↓
, and no blocks along the bottom of the graph.
b.
After the Fault:
PS:
≥
85,
↑
, and block along the bottom of the graph.
