Recorders – Combined with external recorder operating means – Well logging
Patent
1987-07-22
1988-10-18
Goldberg, E. A.
Recorders
Combined with external recorder operating means
Well logging
128697, 128710, G01D 900
Patent
active
047791004
ABSTRACT:
Apparatus for detecting and displaying on a polygraph record chart any change in either the sensitivity or balance control of each polygraph electronic module. The apparatus includes a detector in the form of a differentiator for detecting a change in voltage on the wiper of the sensitivity or balance potentiometer that produces a signal indicative of the voltage change, and a display operatively connected to the detector for displaying a signal indicative of the adjustment of the potentiometer. The record chart display includes circuitry having a monostable multivibrator configured as a non-retriggerable one shot device responsive to the voltage change signal from the detector to provide a single pulse driving signal to a pen driving motor. The circuitry also includes a rectifier circuit in the form of comparators responsive to the voltage change signal for producing a positive trigger signal to the one shot device. The pulse amplitude and width of the waveform on the record chart display may be varied to indicate which polygraph channel and potentiometer was adjusted.
REFERENCES:
patent: 2235894 (1941-03-01), Lee
patent: 2655425 (1953-10-01), Wood
patent: 3908641 (1975-09-01), Judson et al.
patent: 3915156 (1975-10-01), Wastl et al.
patent: 4219028 (1980-08-01), Lencioni, Jr.
Goldberg E. A.
Lafayette Instrument Co., Inc.
Tran Huan H.
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