Remotely calibratable instrument system
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United States of America Patent
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-
Feb 2, 1988
Grant Date -
N/A
app pub date -
Oct 25, 1985
filing date -
Oct 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-wire, admittance-responsive instrument system in which a transmitter, receiver and calibrator are connected by a two-wire transmission line is disclosed. The calibrator repetitively transmits a calibration enabling signal causing the transmitter to increment a reference admittance for comparison to a sensed admittance corresponding to a known physical condition. The calibrator monitors the bistable output signals transmitted by the transmitter in the calibration mode, which changes state when the incremented reference admittance bears a predetermined relationship to the sensed admittance. The calibrator may then transmit additional calibration enabling signals causing preload to be established for transmitter operation.
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