How to Check a Capacitor and Measure Capacitance with a Digital Multimeter

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Language: en

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Welcome To G-TV! Today I will be showing you
how to measure capacitance with a digital
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multimeter. Capacitance is measured in a unit
called farads and the capacitors used in circuitry
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are measured using sub units of microfarads,
nanofarads, and picofarads. Many digital multimeters
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will display the reading with one of these
sub units. Testing with a multimeter is the
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safest way to measure capacitance with the
capacitor removed from any voltage source.
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There is a method that can be used while the
capacitor is connected to a power supply,
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but this should only be done by a qualified
electrician that has had experience in checking
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capacitors. Instead of focusing on this method,
I will be showing two other ways to measure
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capacitance with a multimeter. Some digital
multimeters have a capacitance measurement
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feature. Capacitance could be represented
by the letter C, or CAP, or the electrical
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symbol for capacitor. When the dial is turned
to one of these, the sub unit of farad should
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be indicated within the screen. I will connect
my red probe to the bottom port that has the
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represented symbol for capacitance and also
connect my black probe to the common. My red
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test lead will connect to the positive side
of the capacitor as my black test lead will
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need to connect to the negative side. The
reading on the screen should be similar to
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the value found on the side of the capacitor.
The value may not be exact, but if there is
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a significant difference then your capacitor
may need to be replaced. The other method
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with a digital multimeter is used for multimeters
that do not have a capacitance test function.
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I will instead set the multimeter to the Ohm
range to test for resistance. I will make
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sure that my red and black test leads are
placed in the correct ports. Once I place
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the test leads on my capacitor, a number should
quickly appear before switching to OL. I will
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repeat this a few times and I should be getting
the same number each time before OL. The consistency
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tells me that this is a good capacitor. If
no reading appears each time, the capacitor
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may need to be replaced. Multimeters along
with thousands of products and services are
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available at galco.com. Also, don't forget
to sign up for our newsletter by following
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