Apparatus for and method of internally calibrating an electrical

Details Apparatus for and method of internally calibrating an electrical Apparatus for and method of internally calibrating an electrical

1987-01-29

1991-04-30

Baker, Stephen M.

Electricity: measuring and testing

Testing and calibrating electric meters

324115, 341120, 364482, 364483, 36457101, G01R 3500, G01R 1925, G01R 1512, H03M 110

Patent

active

050121812

ABSTRACT:
A calibrator supplying electric parameters (viz voltage, current and resistances) over plural ranges to a meter to be calibrated comprises internal components for deriving each parameter over the plural ranges, an internal voltage reference, a DAC, a memory, an analog comparator and analog-to-digital converter. The internal components are connected in circuit with the internal voltage reference, analog-to-digital converter, comparator and memory for writing data signals into the memory indicative of calibration correction factors for the internal components. The internal components are connected in circuit with the memory and DAC so the DAC responds to the stored data signals indicative of the calibration correction factors to enable the value of the parameter supplied to the device by the internal components to be modified and corrected in accordance with the calibration correction for the parameter.

REFERENCES:
patent: 4293916 (1981-10-01), Del Re et al.
patent: 4337517 (1982-06-01), Nickel et al.
1978 Wescon Technical Papers, Chellstorp et al., "New Concepts in Calibrators", Sep. 1978, pp. 26/4/1-12.
1981 Internaitonal Test Conference-Testing in the 1980's, Craven et al., "An 18-Bit Precision DC Measurement System", Oct. 1981, pp. 271-289.

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