The three-phase digital voltage meter is assembled from a sensitive galvanometer plus a resistor. They are all based on the magnetic effects of currents. The watch has a magnet and a conductive coil that rotates when the magnet is energized. The larger the current that passes, the greater the magnetic force that occurs and the greater the swaying of the hands of the watch. This is the head of the ammeter and three-phase digital voltage meter.
Because of the sensitive ammeter, the current that is allowed to pass through is small, and the voltage that can be received by both ends is also small. Therefore, to make the ammeter and three-phase digital voltmeter able to measure the current and voltage in the practice circuit, it must be connected in parallel/series. Resistance of resistance. Has achieved diversion / partial pressure effect.
Modified three-phase digital display voltage meter:
Three-phase digital voltage meter is a sensitive current meter with a resistance of larger resistance in series, the resistance of the series play a voltage divider effect. In this way, even if a large voltage is applied to both ends, large and small voltages are applied to the large resistor in series, and the voltage on the meter head will be very small. The resistance R of the series resistance can be calculated according to the formula: U=Ig(Rg+R) (In the meantime, U is the maximum range of the three-phase digital voltmeter, Rg is the internal resistance of the meter, and Ig is the full bias current. R is the resistance that should be connected in series).
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