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Unformatted text preview: reverse polarity. Analog meters can also bias, or turn on,
semi-conductors and change the circuit
by allowing current to flow to other
portions of the circuit.
Most digital meters have a low voltage
setting which will not bias semiconductors and a higher voltage setting
for testing semiconductors. The
information displayed on a digital meter
in the diode test function differs from one
meter brand to another. Some digital
meters will display a value which
represents the perceived resistance
of the diode in forward bias. Other meters
will display the forward bias voltage drop
of the diode.
Digital ohmmeters do have one
limitation. Due to the small amount of
current they pass through the device
being tested, they cannot check some
semiconductors in circuits, such as a
clamping diode on a relay coil. You should note that ohmmeters do little
good in low resistance, high currentcarrying circuits such as starters. They
cannot find points of high resistance
because they only use a small amount of
current from their int...
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