
- D.C. voltages and currents may be measured using digital or analogue meters
- The commonly used analogue meter movement is the moving coil meter – a small current in the coil sets up a magnetic field that causes the meter to rotate; the rotation is opposed by the spring, so that deflection is proportional to the average value of the current
- The sensitivity of the meter is defined by the current flow for full scale deflection (fsd)
- Moving coil meters start at about 50μA fsd