FIELD: electricity.
SUBSTANCE: meter contains two magneto resistive bridges (5, 6), placed equidirectionally, and two conductors (3, 4), united in such a way that the measured current flows into them from the input to the output for installed over them bridges in opposite directions. The outputs of bridges are connected to the inputs of instrument amplifiers (7, 8). The outputs of amplifiers are connected to the amplifier-subtractor (9). Bridges are powered by a constant voltage source. In the supply circuit of the bridges a resistor (10) is additionally introduced. The voltage on resistor is fed to the instrument amplifier (11) with a specified offset and gain. The output of instrument amplifier (11) is connected to the input of reference voltage of ADC (12). A difference voltage of the amplifier-subtractor (9) is fed to the measuring input of ADC.
EFFECT: increase the sensitivity of current meter, compensates for the effect of external magnetic field and temperature on the results of current measurement.
1 dwg
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