Level and frequency measuring recorder

Details Level and frequency measuring recorder Level and frequency measuring recorder

1978-08-31

1980-10-14

Hartary, Joseph W.

Recorders

Combined with external recorder operating means

Well logging

179 1N, 324 77CS, 346 76R, 346113, 346136, G01D 938

Patent

active

042284392

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.

REFERENCES:
patent: 2464708 (1949-03-01), Moseley
patent: 2563384 (1951-08-01), Bekesy
patent: 2629000 (1953-02-01), Olson
patent: 2967749 (1961-01-01), Strickler
patent: 3908641 (1975-09-01), Judson

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