1141-A

General Radio 1141-A Audio-Frequency Meter

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.