How to use a Multimeter
The basics or instructions of how to use a multimeter, including how to use an analog
or analogue multimeter, or a digital multimeter, DMM, and using multimeter their
best advantage.
Multimeters are one of the most commonly used pieces of electronics test equipment.
Although basic operational multimeter instruction may be given when the test meter
is bought, details of how to use the multimeter to test circuits and gain the maximum
use from them are not always available.
Although there are major differences between the internal circuits within analogue
and digital multimeter, the way in which they are used is comparatively similar.
However separate sections are given below with instructions on how to use a digital
multimeter and how to use an analogue multimeter.
How to use a digital multimeter
The operation of a DMM, digital multimeter, itself is normally very straightforward.
With a knowledge of how to make voltage, current and resistance measurements (see
the "Related Articles" on the left hand side of this page for further details) it
is then a matter of putting the multimeter to use. If the meter is new then it will
obviously be necessary to install a battery to power it. This is normally simple
and straightforward and details can be found in the operating instructions for the
DMM.
How to use an analogue multimeter
The operation of an analogue multimeter is quite easy. With a knowledge of how to
make voltage, current and resistance measurements (see the "Related Articles" on
the left hand side of this page for further details) it is only necessary to know
how to use the multimeter itself. If the meter is new then it will obviously be necessary
to install any battery or batteries needed for the resistance measurements.
Follow a number of simple steps:
1. Insert the probes into the correct connections - this is required because there
may be a number of different connections that can be used. Be sure to get the right
connections, and not put them into the ones for a low current measurement if a high
voltage measurement is to be made - this could damage the multimeter.
2. Set switch to the correct measurement type and range for the measurement to be
made. When selecting the range, ensure that the maximum for the particular range
chosen is above that anticipated. The range on the multimeter can be reduced later
if necessary. However by selecting a range that is too high, it prevents the meter
being overloaded and any possible damage to the movement of the meter itself.
3. Optimize the range for the best reading. If possible adjust it so that the maximum
deflection of the meter can be gained. In this way the most accurate reading will
be gained.
4. Once the reading is complete, it is a wise precaution to place the probes into
the voltage measurement sockets and turn the range to maximum voltage position. In
this way if the meter is accidentally connected without thought for the range to
be used, there is little chance of damage to the meter. This may not be true if it
left set for a current reading, and the meter is accidentally connected across a
high voltage point!
Summary
Multimeters are very easy to use, and they are the most essential piece of test equipment
that is needed if any electronics construction work is to be undertaken. Fortunately
the multimeter instructions of how to use them are straightforward, and they should
give many years of good service is treated well. Additionally it is possible to use
a multimeter to perform many types of test. Even the older analogue meters can be
used in a variety of ways, and digital multimeter often have many measurement capabilities
beyond the basic amps volts and ohms measurements.
