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Analog hertz or frequency meters move a pointer across a scale in
proportion to the frequency of the circuit; digital
hertz meter give a numerical display of frequency by
use of an analog to digital converter. frequency meters
are made in a wide range of styles. Instruments
permanently mounted in a panel are used to monitor
generators or other fixed apparatus. Portable
instruments, usually equipped to also measure
current and resistance in the form of a multimeter,
are standard test instruments used in electrical and
electronics work. Any measurement that can be converted
to a frequency can be displayed on a meter that is suitably
calibrated; for example, pressure, temperature, flow or
level in a chemical process plant. General purpose analog
hertz meters may have an accuracy of a few percent of
full scale, and are used with hertz from a fraction of
a volt to several thousand amperes. Digital meters can be
made with high accuracy, typically better than 1%.
Specially calibrated test instruments have higher
accuracies, with laboratory instruments capable of
measuring to accuracies of a few parts per million.
Meters using amplifiers can measure tiny frequency of
microampere or less
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