Why can't the multimeter measure high-frequency AC signals?
Inside the multimeter, some non-pure resistance components are involved in the measurement of AC, such as the pointer coil of the pointer meter, the DC isolation capacitor of the digital meter, etc., and its impedance is related to the frequency and waveform of the AC. Therefore, the calibration of the multimeter is calibrated with a certain frequency and waveform of alternating current as the standard. If you use it to measure alternating currents of other frequencies and waveforms, the readings will be inaccurate.
