Ammeter Shunt Calculations
Amp meters can be used to measure different current ranges, to do this
the meter must have a shunt resistor fitted in parallel with the measuring
circuit. The formula to determine the shunt resistor for an ampere meter is as follows: Rs = Rm / (n  1) Where Rs is the shunt resistor, Rm is the meters internal resistance and n is the multiplier (Current to be Measured). For a full range of Panel Meters 


Table showing shunt resistance values (Rs) for a 0  200mV Digital Panel Meter to enable it to measure current. 


Table showing resistance values for R1 and R2 for a 0  200mV Digital Panel Meter to enable it to measure higher voltages. 
ESR Electronic Components Ltd Cullercoats Tyne and Wear NE30 4PQ