The main function of the shunt is to extract a voltage signal to the ammeter as an indication of the main circuit current. The shunt is connected in series in the main power supply circuit, and the external terminal leads to a voltage signal as an indication of the main circuit current. The ammeter used is actually a voltmeter with a full scale of 75mV. When the current of the main circuit reaches the rated value of the shunt, a voltage of 75mV is generated on the shunt. Use the mV number marked on the dial of the ammeter (or current and voltage dual-purpose meter) to select the rated voltage drop specification of the shunt (generally 75mV or 45mV is commonly used). If the ammeter used does not have this value, use the following formula to calculate the voltage limit of the meter, and then select the rated voltage drop specification of the shunt. The voltage limit of the meter (mV) = the current (A) when the ammeter is full scale × the internal resistance of the ammeter (Ω)/1000.
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