The moving-coil rectifier panel meter are suitable for measuring sinusoidal AC currents and voltages. The frequency range for voltmeters an milliammeters up to 600 mA is 25 to 10.000 Hz. For current higher than 1A – 5A, the frequency can not exceed 50 or 60 Hz. (On request: 400 Hz).
It is possible to measure higher currents and voltages connecting the instruments through suitable measuring transformers.