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    Economical practical three-phase rectified voltage meter ----- DC Voltmeter

     

    Economical practical three-phase rectifier voltmeter, DC Voltmeter Keywords: voltmeter circuit diagram Buy an electrically low voltage DC voltage meter in the market with a range of ranges. Find a larger potentiometer RP (500kΩ or so) is connected in series with the voltmeter, and the RP is adjusted to the maximum; with a rectifier bridge (breakdown voltage should be ≥1000V), the AC input side is connected to the inverter The output terminal, the DC output side is connected to the series circuit of the voltage meter and the potentiometer, as shown in the figure below; the inverter is turned on, and the output frequency is adjusted to 50 Hz. At this time, the output voltage of the inverter should be displayed as 380V; the slight adjustment potentiometer RP, the maximum amount of the pointer of the voltage meter, the maximum voltage of the voltage meter is 380V; the resistance of the potentiometer is measured, and a fixed resistance is replaced with a fixed resistance. Potentiometer and load it into the table.

     

     

     

     

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