Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Self-calibration
Patent
1973-12-03
1976-01-20
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Self-calibration
324 30R, G01R 102
Patent
active
039341976
ABSTRACT:
An automatic calibration system for pH meters includes a digital counter and a digital-to-analog converter which produces an output voltage connected to compensate the zero offset DC voltage of the pH measurement system. During a calibration operation a switch is closed to reset the binary counters and to thereafter supply clock pulses to the counters. As these clock pulses are counted, the digital-to-analog converter produces a staircase output voltage. This is applied to one input of a difference amplifier and the measuring voltage of the pH probe is applied to the other input. A detector stops the application of clock pulses to the counter when the staircase voltage equals the DC offset voltage of the pH measuring probe.
REFERENCES:
patent: 3784912 (1974-01-01), Aken
Cohen et al. "Self-Balancing System for Medical and Physiological Instrumentation", IEEE TRANS on Bio-Medical Engineering, Vol. BME-18, No. 1, Jan. 1971.
Pettersen Aage
Schulkind Herbert
Corning Glass Works
Hille Rolf
Kurtz Richard E.
Patty, Jr. Clarence R.
Rolinec R. V.
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