The main limitations of rectifier instruments
are,
1- These are calibrated interms of r.m.s. value of
purely sinusoidal waveform hence the reading causes errors if waveform is other
than sinusoidal.
2- The reading gets affected due to rectifier
resistance.
3- Due to semiconductor nature of diodes, it is
temperature sensitive as diode characteristics are temperature dependent.
4- The rectifier capacitance may affect the
reading as frequency changes