Auto-Power On/Off; Torch; Low Battery Check; Removable Probe Tip Covers - MARTINDALE VT25 Instruction Manual

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Removable probe tip covers

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Probe tip protective cover
Polarity indicators
When connected to a DC voltage source
either the + or – polarity LED's 13 will
illuminate dependant on polarity. The positive
probe 2 is on the main body and is marked
with L2 and +.
When connected to an AC voltage source
both the + and – polarity LED's will
illuminate.
The polarity LED's will illuminate when the
voltage source is 12V AC rms or DC.
Voltage threshold indicators
The voltage threshold LED's 12 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 the 24V and 50V LED's will
illuminate, if 690V AC rms all voltage
threshold LED's from 24V to 690V will
illuminate.
ELV warning and single pole test
indicator
If the batteries are low or exhausted a
hazardous live voltage will not be indicated
by the polarity or voltage threshold LED's,
but an indication of a voltage above the ELV
limit (50V) will continue to be indicated by
the ELV LED 9 .
The ELV LED also indicates the presence of
AC voltage when the unit is used as a single
pole phase detector.
Continuity indicator
The continuity RX LED 10 will illuminate to
indicate continuity of a circuit under test.
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Buzzer
The buzzer will sound when:
Voltage above the ELV threshold (50V) is
present,
or AC voltage is detected when used as a
single pole phase tester,
or circuit continuity is detected.

3.2 Auto-power On/Off

The voltage tester automatically powers on
when it detects continuity, AC or DC voltage
>10V approx. or a live phase on probe L2
(single pole test).
The voltage tester will automatically power off
5 seconds after ceasing to detect voltage or
continuity.

3.3 Torch

Pressing the torch button 5 will turn on the
torch and power up the voltage tester.
The torch will automatically power off after 10
seconds.

3.4 Low Battery Check

Before and after each use short the test
probes of the voltage tester together.
On the VT25, check for an audible tone and a
bright RX LED indication.
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If there is no audible tone or the RX LED is
faint the batteries need to be replaced (see
section 4.1 Battery Replacement).
On the VT28 if the batteries need replacing
will be displayed in the top left corner of
the LCD.
Do not use the unit if the batteries need
replacing.
3.5 Removable Probe Tip Covers
The probes are fi tted with removable probe
tip covers 14 allowing the probes to comply
with GS38.
Where access to test points may require
extended probe tips, the probe tip covers may
be removed.
Where possible is advisable to keep these
shrouds fi tted. If removed, great care must be
taken when using the voltage tester on CAT
III and CAT IV installations to avoid the risk of
shorting high energy circuits and arc fl ash.
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