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    • 5. 发明授权
    • Test instrument for the display of electric voltages
    • 用于显示电压的测试仪器
    • US5293113A
    • 1994-03-08
    • US960952
    • 1992-10-15
    • Christian BehaMartin Schwartz
    • Christian BehaMartin Schwartz
    • G01R19/257G01R31/02G08B21/00
    • G01R19/257
    • A testing device for single-pole voltage testing comprises, between a test electrode (1) and a ground electrode (2), a high impedance dropping resistor (R1) and a measurement resistor (R2) connected in series. The ground electrode (2) is capacitively coupled to earth through the body of the user. The value of the dropping resistor (R1) is at least 10 times greater than the maximum variation which occurs in the capacitively coupled reactance (C1, C2) of the user relative to the ground, so that the total impedance is almost constant. The voltage drop across the measurement resistor (R2) is amplified, rectified and compared in a comparison circuit with predetermined reference voltages in order to control a light emitting diode indicator (D2, D3, D4, D5) corresponding to the measured voltage. The test device can also be constructed for contactless voltage testing or can also be used as a continuity tester.
    • 用于单极电压测试的测试装置包括在测试电极(1)和接地电极(2)之间,串联连接的高阻抗降压电阻器(R1)和测量电阻器(R2)。 接地电极(2)通过使用者的身体与地电容耦合。 下降电阻器(R1)的值比在用户相对于地面的电容耦合电抗(C1,C2)中发生的最大变化大至少10倍,使得总阻抗几乎恒定。 测量电阻器(R2)上的电压降被放大,整流,并在比较电路中与预定的参考电压进行比较,以便控制对应于测量电压的发光二极管指示器(D2,D3,D4,D5)。 测试装置也可以用于非接触式电压测试,也可以用作连续性测试仪。