These modulations are usually the undesirable result of the 50 or 60 Hz power source and are not necessarily sinusoidal. Some of the important specifications follow.
Internal amplifier provides linear phase response.
50 mA each External equipment required 1. Digital storage oscilloscope with signal-averaging capability. 2.Carrier source with hum modulation levels lower than the levels that are to be measured. 1 dB for carrier and modulation levels specified above Software Software interfaceable. Automated measurement software available.