Unformatted text preview: f each.
Before using a meter, read the
manufacturer's operating instructions.
Reading analog meters usually requires
simple mental calculations. For example,
a meter might have three voltage ranges:
4.0 V, 20 V and 40 V, but only two scales:
4.0 V and 20 V. In order to use the 40 V
range, you need to multiply the needle
reading on the 4.0 V scale by 10 (or for
that matter, the 20 V scale by 2).
Digital meters are usually simpler to
read and many will adjust to the proper
range required for the circuit or device
they are Voltmeters measure voltage or voltage
drop in a circuit. Voltage drop can be
used to locate excessive resistance in the
circuit which could cause poor
performance or improper operation. Lack
of voltage at a given point may indicate an
open circuit or ground. On the other
hand, low voltage or high voltage drop,
may indicate a high resistance problem
like a poor connection.
Voltmeters must be connected in parallel
with the device or circuit so that the
meter can tap off a small amount of
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