| 摘要 |
1,267,245. Programmed control of testing. BRITISH STEEL CORP. June 26, 1970 [June 26, 1969], No.32448/69. Heading G3N. An instrument is calibrated for use in controlling a dynamic process by applying to that instrument n different levels of input on n-1 occasions in a sequence that on each application of an input level it is immediately preceded by a different input level which is itself different from that proceding each of the other of said n-1 1 applications and measuring the output of the instrument and calculating the mean of the output values measured at each input level. In an embodiment, a pressure transducer exhibiting an hystersis effect with rise and fall of input signal is calibrated by the random application of a range of pressure valves and the resultant electrical output signals are analyzed to derive a 'best-fit' calibration line and a pair of parallel lines defining the accuracy and repeatability of the calibrated transducer. The resulting calibration is employed in a computer-controlled process to correct the readings of the transducer. It is stated that a resistance thermometer can be calibrated by a substitution technique and a programme for control of a process can be arranged to effect recalibration of the instruments monitoring the process at predetermined intervals.
|
