DC Shunt

1. Method of selecting shunt

(1) Select the rated voltage drop specification of the shunt (75mV or 45mV is commonly used) according to the mV number marked on the dial of the ammeter (or current and voltage dual-purpose meter) used. If the current meter 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.

meter (mV)= current at full scale of ammeter (A)× internal resistance of ammeter (Ω)/1000

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

(3) Connect the two current ends of the selected shunt to the power supply and the load respectively, and connect the potential end to the ammeter. Pay attention to the DJ623-8 polarity of the terminals of the ammeter, and the range of the ammeter will be expanded to the current value calibrated on the shunt.

2, the use of the shunt after the current meter multiple calculation method.

For motor test measurement, an ammeter is often equipped with multiple shunts to solve the problem of ensuring the required measurement accuracy in a large measurement range. At this time, it is required that the rated voltage drop of all shunts used is consistent with the equipped ammeter, for example, 75mV. In this way, after the shunt is selected, the full scale of the ammeter is the rated current value of the selected shunt, and the multiple of the ammeter (I. e. the number of currents per dial scale) is the total number of rated currents of the shunt divided by the dial scale.

Shunt for DC current measurement is available in both slot and non-slot types. The shunt has a manganese-nickel-copper alloy resistance bar and a copper strip, and is plated with a nickel layer. Its nominal voltage drop is 60mV, but it can also be used as 75, 100, 120, 150 and 300 mV.

Slot Shunt Current Rating: 5 A, 10 A, 15 A, 20 A and 25 A

non-slot shunts are available at standard intervals from 30 A to 15 kA.