FIELD: electrical measurement.
SUBSTANCE: device has reference resistance standard made in form of three resistors connected in parallel. Resistors have non-standardized error and can be disconnected from measuring circuit and transformation factor of reference resistance standard can be changed. Dc shunt error is measured by means of double-turn dc potentiometer which has terminal of the first turn to be connected with potential terminals of resistance reference standard and terminals of the second turn to be connected with potential terminals of tested shunt. Shunt is connected in parallel with resistor which simulates resistance of measuring device and standard resistance coil to provide disconnection of both units from measuring circuit. Rated value of resistance of the third resistor of reference resistance standard which have larger resistance equals to rated value of resistance of the resistor which simulates resistance of measuring device.
EFFECT: improved precision of calibration testing; simplified design.
1dwg
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