Generally, there are four bolts on the shunt, two large and two small. Two large bolts are used to connect the shunt in series to the circuit of the current signal to be measured. Two small bolts are connected to the signal input end of the instrument. Pay attention to the polarity of the signal. The end where the current flows into the shunt is the positive end and connects to the positive input end of the signal input end of the instrument; the end where the current flows out of the shunt is the negative end, which is connected to The negative input terminal of the instrument signal input terminal.