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A bar graph of 6 red LED's on the RHS of the unit is used in both FIND and
VAC functions to display the signal strength.
1.3. Low Battery:- If the battery voltage is lower than a pre-set level of
6.9V the Green status LED flashes every 500ms. The battery should be
replaced (see section 4.1).
1.4. Push -button Switch:- Used to activate the following functions:-
1.5. Activation of test signal in VAC function.
1.6. Automatic threshold mode – in FIND function hold down push-button
for 2 seconds.
Auto mode bar graph centring – momentarily press to set the bar graph
indication to the centre of the scale when using the FIND function.
Deactivation of battery power down – hold down while switching from OFF
to FIND or VAC.
Manual mode threshold – momentarily press to set a new threshold when
using the FIND function in presence of signal.
Resetting sensitivity threshold - When out of signal range momentarily
press to set the sensitivity threshold to the power-up default level when
using the FIND function.
3.3.3 Using in Manual Threshold Mode
Hold the FD650/R receiver in close proximity to the box suspected of
housing the fuse or circuit breaker being sought. If the signal is present an
audible tone will be emitted from the FD650/R.
Hold the FD650/R against the first fuse or circuit breaker of the box as
shown in figure 4. The orientation of the FD650/R in relation to the fuse /
breaker must be as shown in figure 4 and it should be held in the centre of
the fuse or circuit breaker.
Depending on the signal strength the bar graph may be activated. Press
the SET button to set the sensitivity and the lower 3 to 4 segments of the
bar graph will be illuminated.
Move along the row of fuses/circuit breakers, stopping at the centre of each
fuse/circuit breaker and noting the signal strength on the bar graph display.
Every time this signal causes the bar graph to exceed 3 to 4 segments,
press the SET button to set the new sensitivity threshold.
Be sure to check all the fuses/circuit breakers, and then go back over all
the fuses/circuit breakers. Only one fuse/circuit breaker should now show a
signal strength indication on the bar graph. If this is not the case then
repeat the above procedure, until only a single fuse/circuit breaker causes
an indication.
Switch off/remove the fuse/circuit breaker that shows the maximum signal
strength and check that the FD650/R bar graph is no longer illuminated and
the audible tone is no longer present when the fuse / circuit breaker
location is re-checked.
Go to the transmitter, if the correct fuse/circuit breaker has been switched
off/removed then the red ON indicator should no longer be illuminated.
3.3 Using the FD650/R and FD500/T or FD600/T as a
Fuse Finder
Ensure you have read the precautions (Section 3.1) before proceeding.
3.3.1 Pre-Check of the FD650/R and FD500/T or FD600/T
Plug the FD500/T or FD600/T transmitter into a known socket and ensure
the red ON indicator is illuminated.
Switch the FD650/R receiver to FIND and verify the green battery indicator
is continuously illuminated. If the green battery indicator is flashing the
battery is low and should be replaced (see section 4.1).
Hold the FD650/R in close proximity to the transmitter and verify
illumination of the FD650/R SIGNAL bar graph and that an audible tone is
present. The number of illuminated segments of the bar graph will depend
on the FD650/R position and orientation with respect to the transmitter.
Do not use if the pre-check fails.
3.3.2 Locating a Fuse or Circuit Breaker
Plug the FD500/T or FD600/T into a socket of the circuit to be traced and
ensure the red ON indicator is illuminated. If you are using the FD600/T
with TL83 or TL88 leads refer to section 3.3.5.
Switch the FD650/R to FIND and verify the green battery indicator is
continuously illuminated.
When switched to FIND, the FD650/R defaults to the manual threshold
mode (see section 3.3.3). The FD650/R can alternatively be operated in the
automatic threshold mode (see section 3.3.4).
N.B. The unit defaults to Manual Mode when switched on (see
sections 3.3.3 and 3.3.4).
9
10
11
12
Figure 4. Correct
The receiver must be held
in this orientation in relation
to the breaker to find the
correct fuse/circuit breaker.
If the individual breakers
were
horizontal,
the
receiver would have to
rotated through 90° (in
either direction).
Figure 5. Wrong
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