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A meter is any device built to
accurately detect and display an electrical quantity in a
form readable by a human being. Usually this "readable form"
is visual: motion of a pointer on a scale, a series of
lights arranged to form a "bargraph," or some sort of
display composed of numerical figures. In the analysis and
testing of circuits, there are meters designed to accurately
measure the basic quantities of voltage, current, and
resistance. There are many other types of meters as well,
but this chapter primarily covers the design and operation
of the basic three.
Most modern meters are "digital" in design,
meaning that their readable display is in the form of
numerical digits. Older designs of meters are mechanical in
nature, using some kind of pointer device to show quantity
of measurement. In either case, the principles applied in
adapting a display unit to the measurement of (relatively)
large quantities of voltage, current, or resistance are the
same.
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