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    • 9. 发明授权
    • Measuring attachment connectible to a multimeter for measuring earth
resistances
    • 可连接万用表测量接地电阻的测量附件
    • US4590421A
    • 1986-05-20
    • US549457
    • 1983-11-07
    • Daniel ArnouxJean BousquetClaude Genter
    • Daniel ArnouxJean BousquetClaude Genter
    • G01R27/20G01R27/02G01R27/26
    • G01R27/20
    • The invention provides a measuring attachment connectible to a multimeter for measuring earth resistances, comprising a casing having a first group of terminals for a measurement signal and a second group of terminals for electrical connection of the attachment to a multimeter, and electric circuits housed in the casing and comprising generator means for generating an AC current of constant value but of a frequency different from that of the mains and its harmonics, said generator means having an output connected to first and second terminals of said first group of terminals, and a synchronous detector having a measurement signal input which is connected to said second terminal and to a third terminal of said first group of terminals, a control input which is connected to said generator means and an output which is connected to first and second terminals of said second group of terminals.
    • 本发明提供了可连接到万用表测量接地电阻的测量附件,包括具有用于测量信号的第一组端子的壳体和用于将附件电连接到万用表的第二组端子,以及容纳在该测量信号中的电路 壳体并且包括用于产生恒定值但是与电源及其谐波不同的频率的AC电流的发电机装置,所述发电机装置具有连接到所述第一组端子的第一和第二端子的输出端,以及同步检测器 具有连接到所述第二端子和所述第一组端子的第三端子的测量信号输入端,连接到所述发生器装置的控制输入端和连接到所述第二组端子的第一和第二端子的输出端 终端。