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  2. Frequency meter - Wikipedia

    en.wikipedia.org/wiki/Frequency_meter

    A frequency meter is an instrument that displays the frequency of a periodic electrical signal. Various types of mechanical frequency meters were used in the past, but since the 1970s these have almost universally been replaced by digital frequency counters .

  3. Frequency counter - Wikipedia

    en.wikipedia.org/wiki/Frequency_counter

    A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of cycles of oscillation or pulses per second in a periodic electronic signal. Such an instrument is sometimes called a cymometer, particularly one of Chinese manufacture. [citation needed]

  4. Absorption wavemeter - Wikipedia

    en.wikipedia.org/wiki/Absorption_wavemeter

    An absorption wavemeter is a simple electronic instrument used to measure the frequency of radio waves.It is an older method of measuring frequency, widely used from the birth of radio in the early 20th century until the 1970s, when the development of inexpensive frequency counters, which have far greater accuracy, made it largely obsolete.

  5. Frequency - Wikipedia

    en.wikipedia.org/wiki/Frequency

    Frequency (symbol f), most often measured in hertz (symbol: Hz), is the number of occurrences of a repeating event per unit of ... A resonant-reed frequency meter, an ...

  6. EMF measurement - Wikipedia

    en.wikipedia.org/wiki/EMF_measurement

    An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF). Most meters measure the electromagnetic radiation flux density (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.

  7. 10-meter band - Wikipedia

    en.wikipedia.org/wiki/10-meter_band

    The 10-meter band is a portion of the shortwave radio spectrum internationally allocated to amateur radio and amateur satellite use on a primary basis. The band consists of frequencies stretching from 28.000 to 29.700 MHz.

  8. Spectrum analyzer - Wikipedia

    en.wikipedia.org/wiki/Spectrum_analyzer

    The frequency halfway between the stop and start frequencies on a spectrum analyzer display is known as the center frequency. This is the frequency that is in the middle of the display's frequency axis.

  9. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    For a complete sound level meter check, periodic testing outlined in IEC61672.3-2013 should be carried out. These tests excite the sound level meter across the entire frequency and dynamic range ensuring compliance with expected design goals defined in IEC61672.1-2013.

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