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  • Measuring instruments designed to measure the frequency of electric signals in one or more different ranges from a few hertz to several gigahertz. These instruments usually consist of an electronic unit including controls, a display, and attached cables and probes appropriate to perform the measurement. The counters may also include computerized capabilities to process the signals and outputs that permit recording, printing, and/or further processing of the results. Frequency counters are also used to measure time and/or the period of the signals as an inverse relationship to frequency.
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