1. How to use the shunt

Select the rated voltage drop specification of the shunt according to the mV number marked on the dial of the ammeter (or current-voltage dual-purpose meter) used (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 table, and then select the rated voltage drop specification of the shunt. The voltage limit of the meter (mV) = the current (A) at the full scale of the ammeter × the internal resistance of the ammeter (Ω) x 1000.

Select the rated current specification of the shunt according to the current range to be expanded.

Connect the two current terminals of the selected shunt to the power supply and the load respectively, and connect the potential terminal to the ammeter. It should be noted that the polarity of the terminals of the ammeter should be connected, and the range of the ammeter will be expanded to the current value calibrated on the shunt.

2. How to connect the shunt

In general, there are four bolts on the shunt, two large and two small, and the two large bolts are used to connect the shunt in series to the circuit of the current signal to be measured. The 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 is connected 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. The negative input terminal of instrument signal input terminal.

Pin 1 is connected to the positive input terminal of the load signal under test (the positive terminal of the load does not need wiring).

Pin 3 is connected to the positive signal input terminal of the load (the wiring of the negative terminal of the load does not need to be changed).

Pins 6 and 7 are 4-20mA output for the transmission signal, only the models with (I) have this function.

8 feet and 10 feet are connected to the mains 220V, which is used as the working power supply of the instrument itself (applicable to the mainland, Hong Kong, and other regions).

9 feet and 10 feet are connected to the mains 110V, which is used as the working power supply of the instrument itself (applicable to Taiwan, the United States, and other regions).