发明名称 |
Remotely calibratable instrument system |
摘要 |
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.
|
申请公布号 |
US4849754(A) |
申请公布日期 |
1989.07.18 |
申请号 |
US19880151626 |
申请日期 |
1988.02.02 |
申请人 |
DREXELBROOK CONTROLS |
发明人 |
MALTBY, FREDERICK L.;HALL, RICHARD G.;KRAMER, JONATHAN L.;HOOPES, HOWARD S.;PETERSEN, STEVEN R. |
分类号 |
G01D18/00;G08C19/02 |
主分类号 |
G01D18/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|