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    • 1. 发明授权
    • Automatic balancing DC comparator voltmeter
    • 自动平衡直流比较电压表
    • US3928799A
    • 1975-12-23
    • US47148274
    • 1974-05-20
    • CANADIAN PATENTS DEV
    • KUSTERS NORBERT LMACMARTIN MALCOLM P
    • G01R17/06G01R29/20
    • G01R29/20G01R17/06
    • An apparatus for measuring potentials with great accuracy using a self-balancing current comparator. The comparator includes a variable primary winding and a secondary winding wound on a magnetic core. The primary is fed a constant current I2 and the secondary is fed with a direct current such that ampere-turns balance is achieved between the windings. A resistor R1, to which the unknown potential Vin is connected, is in turn connected to the secondary winding. An operational amplifier is connected to the junction between the resistor and the secondary winding. The output of the amplifier adjusts the turns in the primary winding and as a result when the potential across the amplifier is zero, the unknown voltage Vin R1.N2/N3. I2 where N2 and N3 are the turns in the primary and secondary windings respectively.
    • 一种使用自平衡电流比较器以高精度测量电位的装置。 比较器包括可变初级绕组和缠绕在磁芯上的次级绕组。 初级线圈馈送恒流电流I2,二次线路馈送直流电,使得绕组之间实现安培匝数平衡。 连接未知电位Vin的电阻器R1又连接到次级绕组。 运算放大器连接到电阻和次级绕组之间的结。 放大器的输出调节初级绕组中的匝数,因此当放大器两端的电位为零时,未知电压Vin = R1.N2 / N3。 I2,其中N2和N3分别是初级和次级绕组的匝数。