Level and frequency measuring recorder
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United States of America Patent
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-
Oct 14, 1980
Grant Date -
N/A
app pub date -
Aug 31, 1978
filing date -
Sep 5, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An audio-frequency generator applies signals to a unit under test. The output of the tested unit is applied selectively through either an amplifier having a linear or a logarithmic characteristic to a push-pull output stage driving a rotary coil measuring instrument. The latter drives a recording stylus. An electronically controlled paper drive is coupled to the wiper arm of a potentiometer. The voltage picked up by the wiper arm is applied to the audio-frequency generator to control the frequency thereof.
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