Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-03-25
1977-08-02
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 30R, G01N 2742
Patent
active
040399338
ABSTRACT:
A continuous automatic calibration system and fault detection method for analytical instruments of the kind used for measuring constituents of a fluid sample which system includes a memory for storing reference information, a comparator circuit for continuously comparing the instrument output to the stored reference information, and a sample-and-hold circuit charged positive or negative by the comparator, depending whether or not the instrument output exceeds the value of the reference information. The output of the sample-and-hold circuit in turn is coupled to the instrument continuously to adjust its output to correct value. Where the maximum allowed corrective range of the sample-and-hold circuit is exceeded by the signal from the comparator circuit beyond a predetermined time period, the system displays fault, warning the operator.
REFERENCES:
patent: 3095535 (1963-06-01), Jaffe et al.
patent: 3781677 (1973-12-01), Hagen
patent: 3889255 (1975-06-01), Pettersen
patent: 3934197 (1976-01-01), Pettersen
Dacey G. Eugene
Instrumentation Laboratory Inc.
Tokar M.
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