Shenzhen IDUTEX Tech Co., Ltd
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Here is an example for this application.
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If you are following a short in the brake light circuit, you may know
that the wire must pass through the wiring harness at the door sill. Locate
the color-coded wire in the harness and expose it.
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Probe through the insulation with the probe tip, and depress the power
switch forward to activate and energize the wire.
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If the circuit breaker tripped, you have verified the shorted wire. Cut
the wire and energize each end with the probe tip. The wire end which
trips the circuit breaker again is the shorted circuit and it will lead you to
the shorted area.
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Follow the wire in the shorted direction and repeat this process until
the short is located.
3.10 Red/Blue Polarity LED
The Red/Blue Polarity LED lights up when the probe tip voltage matches
the battery voltage within ±0.8 volts. It is added information that could be
valuable to the technician.
If the circuit you are testing is not within a 0.8 volt (plus or minus) of supply
voltage, you will see the voltage reading on the LCD but you will not hear
a tone or see a red or blue LED. This tells you either you have a voltage
drop in excess of 0.8 volt from battery voltage or you are probing a circuit
that has an increase of a 0.8 volt or more over battery voltage.
To determine battery voltage, simply remove the tip from the circuit and
press the power switch forward. Battery voltage will then be displayed on
the LCD. The difference between the battery voltage and what is read on
the circuit is either voltage drop or voltage increase. This allows you to
determine a voltage drop without running back to check the battery. It
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just another one of time saving feature the tool has.