FIELD: measuring techniques; flow measurement devices.
SUBSTANCE: device consists of alternating voltage source, differential transmitter, differential and summing amplifiers and synchronous detector. The alternating voltage source is connected to the input of the differential transmitter. The output of the differential transmitter is connected to the input of the differential and summing amplifiers. The output of the differential and summing amplifiers is connected to the input of the synchronous detector. The device has an extra null device, positive feedback block and a low-pass filter. The input of the positive feedback block is connected to the output of the null device, while the output is connected to its non-inverting input. The low-pass filter is connected between the output of the synchronous detector and the input of the null device.
EFFECT: increase in measurement accuracy and operation reliability.
2 cl, 2 dwg
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