DEVICE FOR MEASURING COMPLEX RESISTANCE OF BRIDGE CIRCUIT

摘要

FIELD: electrical measurement equipment.;SUBSTANCE: invention relates to electrical engineering, and particularly to AC bridge methods of measuring arm complex impedance parameters, and can be used in devices for measuring amount of fuel, in particular for devices for measuring fuel consumption of manned spacecraft to measure low flow rates. Device measuring complex impedance of bridge circuit comprising an adjustable amplifier imbalance element constant frequency generator, a phase shifter, first and second comparators, amplitude, phase sensitive lock first amplifier measuring a bridge transformer filter. Constant frequency generator is connected via a second amplifier and a transformer to input terminals of input transformer measuring bridge diagonal, midpoints of which are connected and grounded. Second input of first amplifier is connected to output terminal of second bridge diagonal of measuring transformer. Between first input of first amplifier and mid-point of bridge transformer there is a measuring resistor. Controlled amplifier and imbalance element are connected in series and connected between second input of first amplifier and mid-point of measuring bridge transformer. Using claimed device for its implementation reduces guarantee reserves of fuel components in tanks of aerospace hardware, thus increasing weight of useful output load of launch vehicles.;EFFECT: broader functional capabilities by enabling measurement of fuel consumption under zero gravity and at low costs and high measurement accuracy.;1 cl, 2 dwg