Operation; Description Of Led Indicators; Use Of Test Prod Shrouds - MARTINDALE VI13800 Instruction Manual

voltage indicator forward of the finger guards while applied to
hazardous voltages.
While taking all required safety precautions connect the test prods
across the test points where a voltage difference may be present.
The polarity and voltage level of any voltage present between the
test points will be indicated by the illumination of the voltage
indicator LED's.
3.6 Interference (Phantom) Voltage
It is possible for wiring that is 'dead' to indicate the apparent
presence of voltage at power frequency.
If wiring that is live is running in close proximity to the 'dead' wiring
being tested, there can be capacitive or inductive coupling
between the two, thereby causing interference (phantom) voltages.
Voltage indicators that draw a relatively low current (the VI13800
draws below the safety limit of 3.5mA) when testing for hazardous
live voltages may not be able to suppress the interference voltage
sufficiently to avoid indicating the presence of a hazardous live
voltage when none is present.
The VI13800 will not suppress typical levels of interference voltage
as defined by the test for interference voltage in the standard EN
61243-3:2010.
If there is any doubt as to whether a voltage indication is
hazardous live or interference, then an alternative voltage indicator
capable of distinguishing between the two should be used, or
alternative tests should be performed.
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3. OPERATION

3.1 Description of LED Indicators

Voltage thresholds:
Polarity indication:
When connected across a DC voltage source either the + or –
LED will illuminate dependant on polarity. The prods are marked
red (positive input) and black (negative input).
When connected across an AC voltage source both the + and –
LED's will illuminate.
The polarity LED's will illuminate when the voltage source is
approx. 12V AC rms or DC.
Voltage thresholds:
The voltage threshold LED's will illuminate when the magnitude of
the voltage source is at a value approaching or greater than the
corresponding marked voltage. For example if the voltage source
is 55V AC rms then only the 50V LED will illuminate, if 450V AC
rms all four LED's will illuminate.

3.2 Use of Test Prod Shrouds

The shrouds around the test prods are normally sprung forwards
to IP 2X rating and are retractable.
Polarity
indication:
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