How to calculate multiple of ammeter after using shunt
Motor test measurements often require ammeters to be equipped with multiple shunts to solve the problem of ensuring the required measurement accuracy over a larger measurement range.
At this point, all shunts used must have a voltage drop rating that matches the ammeter (e.g. 75 mV).
So, after selecting a shunt, the entire range of the ammeter is the rated current value of the selected shunt, and the multiple of the ammeter (i.e. the current per dial scale) is the rated current of the shunt divided by the Thing. The total number of ticks on the dial scale.
There are slotted and non-slotted shunts for DC current measurement. The shunt has manganese-nickel-copper alloy resistance bars and nickel-coated copper tape.
The rated voltage drop is 60mV, but is also available for 75, 100, 120, 150 and 300mV. Slot type shunts are rated for 5A, 10A, 15A, 20A and 25A. Standard pitch for non-slotted shunts is 30A to 15kA.
