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Autofunction voltmeter

  • US 4,520,310 A
  • Filed: 06/18/1982
  • Issued: 05/28/1985
  • Est. Priority Date: 06/18/1982
  • Status: Expired due to Fees
First Claim
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1. In a measuring device for an input voltage, which device has an input voltage means for receiving the input voltage, an AC to DC converter means for providing a DC output voltage, and a measurement and display means;

  • a circuit structure for changing operating function between AC and DC measuring and display modes, which circuit structure is operatively connected with the input voltage means, the AC to DC converter means, and the measurement and display means, the circuit structure comprising;

    comparing means connected for comparing a portion of the input voltage with a first reference voltage and for providing an output signal having states indicative of the result of the comparison,controlled switching means responsive to the output signal of said comparing means for connecting and disconnecting the output voltage of the AC to DC converter means to and from, while at substantially the same time disconnecting and connecting the input voltage from and to, the measurement and display means,whereby input voltages are automatically measured and displayed as AC voltages with AC to DC conversion whenever the input voltages have an AC component of a particular relation to the first reference voltage.

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