How Digital Multimeter Works
How Digital Multimeter Works
As
the name suggests, multimeters are those measuring instruments which
can be used to calculate multiple circuit characteristics. Making them
digital gives highly precise outputs as unlike their analog
counterparts, there is no needle whose pointer is to be figured out. How
are the digital meters more advanced than their predecessor? What
internal circuitry is there to power such quick and rapid calculations?
Just simply hook it to the circuit and take readings on the fly?
Multimeter does that for us. So let us explore the Nitty Gritties of the
Multimeter that make it a jack of many (if not all) trades of
electrical measurements.
Outer Casing
The
image above depicts commonly used multimeter. Encased in a durable
plastic casing, this measuring and testing instrument comes with an
optional support to make it stand tilt for easy reading purposes.
Every
multimeter comes with a few specifications that define the functions
and range it can measure. For instance, the one in this insight can
measure DC voltage in the range between 400mV to 1000V and resistance
can be measured from 400Ohm to 400MegaOhm. Apart from measuring the
conventional measurements of current, voltage and resistance, the
instrument shown can also test logic, measure diode characteristics, and
test transistor for small current gain and even measure frequency. To
measure continuity, a buzzer is provided which makes a sound indicating
the circuit is working.
Accuracy
is one of the most critical aspects in the specifications. This degree
of closeness of the measured result to the actual one should be as high
as possible. Lesser the deviation margin, higher would be the accuracy.
For instance, a multimeter measuring voltage with +/-0.6V accuracy would
be more precise in its reading when compared to +/- 0.8V. Often quality
of multimeters is judged on the basis of accuracy.
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