1141-A: Difference between revisions
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|class=frequency standards and meters | |class=frequency standards and meters | ||
|summary=Frequency meter | |summary=Frequency meter | ||
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|caption=General Radio 1141-A Audio-Frequency Meter | |caption=General Radio 1141-A Audio-Frequency Meter | ||
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GR 1141-A Front.jpeg | |||
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[[Category:Frequency Standards and Meters]] | [[Category:Frequency Standards and Meters]] | ||
Revision as of 14:05, 18 March 2025
The General Radio 1141-A Audio-Frequency Meter was introduced in Catalog L (1948) and remained available through Catalog M (1951).
The 1141-A is an analog direct-reading frequency meter "completely covering the usual audio-frequency range and extending somewhat beyond that range in both directions". It makes use of the Wien bridge circuit, along with an external detector such as a pair of high impedance headphones, to measure the input frequency. The operator selects the frequency range and turns the frequency dial to minimize the signal at the detector. The input frequency is then read from the range selection multiplier the setting of the frequency dial.
The 1141-A may also be used as a band-elimination filter, or to measure total harmonic distortion.