TD series single phase solar power inverter
1. Usually, the voltmeter can be modified by a microammeter (a type of ammeter) or a sensitive ammeter.
2. Under the condition that the full bias current and internal resistance of the microammeter are constant, as long as a sufficiently large resistor is connected in series, the voltage that it can withstand at both ends will also increase. It is advisable to set the full bias current as I, and The internal resistance of the microammeter is r, and the resistance of the series resistance is R, then the range of the modified voltmeter is I*(R+r). The larger the R, the larger the range. This can be used as a voltmeter Why should it be connected in series One of the reasons for a large resistance.
3. When the voltmeter is working, it is connected in parallel with the circuit or resistance to be measured. At this time, the voltages at both ends of the voltmeter and the circuit are equal. If the resistance of the voltmeter cannot be ignored, the total resistance of the parallel circuit is composed of the voltmeter and the resistance to be measured. Value: 1/R and = 1/R to be measured + 1/R voltmeter
If and only when the internal resistance of the voltmeter is infinite, it can be considered that 1/R voltmeter = 0, then the resistance value of the parallel circuit can be considered to be the resistance value of the resistance to be measured, and the current through the voltmeter can be considered to be 0, It is considered that both ends of the voltmeter are not involved in the circuit.
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