Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-01-27
1976-08-03
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
340253B, G01R 3102
Patent
active
039731847
ABSTRACT:
An improved thermocouple circuit condition detector for use in a measuring system requiring simultaneous analog trend recording and analog to digital conversion is disclosed. For analog to digital conversion the circuit testing period must be very short to fit in the time interval between conversions. For analog trend recording there should be no interruption of the analog circuit during the testing period and there should be no analog errors introduced by the testing circuit. All of these requirements are achieved by a novel pulse comparison circuit wherein a pulse by way of a direct path is applied as one input to a differential amplifier while that same pulse by way of the input terminal of the measuring amplifier which is connected to the ungrounded thermocouple lead, is applied to the other input of the differential amplifier. The detector alternately checks for open circuit and short circuit conditions.
REFERENCES:
patent: 2793343 (1957-05-01), Wagner
patent: 3284705 (1966-11-01), Dobson
patent: 3431490 (1969-03-01), Kwap et al.
patent: 3468164 (1969-09-01), Sutherland
patent: 3486499 (1969-12-01), Yen
patent: 3559051 (1971-01-01), Mazurek
patent: 3590370 (1971-06-01), Fleischer
patent: 3699438 (1972-10-01), Webb
patent: 3713020 (1973-01-01), Kohler
patent: 3760265 (1973-09-01), Hutch
patent: 3812303 (1974-05-01), Stewart
Leeds & Northrup Company
MacKay Raymond F.
Strecker Gerard R.
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