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OPERATION METAL/VOLTAGE
DETECTION PROCEDURE
METAL/VOLTAGE DETECTION PROCEDURE:
1. Hold the unit as shown (fig.3) and turn the adjusting dial fully
downwards.
2. Move the selector switch to VOLTAGE/METAL DETECTOR
position. The GREEN ‘ON’ light emitting diode will come on
immediately. Make sure that the unit is well away from any metal
or current carrying conductor.
3. Turn the adjusting dial upwards until the indicators come on
(RED and GREEN LED lights and BUZZER sounds). Reverse the
adjusting dial gently until the RED indicator just goes off. The
unit is now ready for use.
4. Hold the unit as shown (fig.4) and move it sideways (in
horizontal position), across the wall. The RED LED and a
continuous buzzer tone will come on when a metal object is in
the vicinity. Current-carrying conductor will be shown with a
RED blinking LED and beeping sound of BUZZER (fig.5).
5. If the indicators do not go on, or won’t go out, after the set has
been switched on, the unit needs to be adjusted. For details,
please refer to ‘UNIT ADJUSTMENT’(see section on
“Accuracy/Calibration”).
SAFETY:
When the unit gives a ‘NO VOLTAGE’ reading (no blinking motion
of RED LED and beeping sound of BUZZER when touching the
conductor), check the unit on a known source BEFORE touching
any conductor.
CAUTION:
It will not detect shielded conductors, i.e. those in metal conduit,
it only shows presence of METAL.
NOTE:
1. Some walls may contain metallized fibre for fireproofing, this
will spread the area of voltage pick-up. Placing your free hand
on the wall may cancel the effect.
2. Rubbing or banging the unit on the wall, may generate static
electricity and cause a false reading.
3. The wearing of rings and other hand jewellery may cause a false reading.
LEAKAGE CURRENTS:
Because of the extremely small current required to cause a reading on the unit, apparent false
readings may be seen in some situations, i.e. a conductor with poor insulation touching a damp
wall, will show a voltage on the wall. In this situation, the unit is indicating a potential hazard which
should be checked with a voltmeter.
Fig.3.
Fig.4
.
Fig.5.
