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3. OPERATION
Caution
Always make sure the precautions and limitations of the unit being
tested are observed. If necessary refer to the specification of the unit
being tested.
Also refer to the graph of typical output voltage under various load
conditions at the rear of these instructions.
3.1 Proving Unit LED indications
LED
High Voltage
Low Battery
3.2 Proving a Test Lamp, Voltage Tester/ Indicator, DMM etc.
Place one probe of the unit under test into the left hand socket of the
proving unit until it makes contact with the terminal. Place the other probe
into the right hand terminal of the proving unit and gently press down.
Observe that the required indicators on the unit under test illuminate,
then withdraw the probe from the right hand terminal first, and then
the left.
The voltage LEDs will illuminate according to the output voltage. This
will start at the maximum voltage for about 4s and then ramp down to
50V over about 4s. The voltage will be held at 50V for about 2s after
which the output voltage will fall to zero and a low resistance will
appear across the terminals verifying the continuity function on two
pole testers.
4
Proving unit model No.
All models
All models
LED illumination indicates
High voltage output at proving
unit terminals
Proving unit batteries are low
Replace batteries
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