What should I pay attention to when measuring current with a multimeter?

Before measuring the current, you must first clarify whether it is DC current or AC current, turn the conversion switch to the DC current range or AC current range; select the appropriate range; connect the device in series to the circuit; the measured current value is:

i = range/full scale × pointer index

When measuring current, please note: If measuring DC current, the positive and negative poles of the meter probe cannot be connected reversely; the meter must be connected in series to the circuit.