Fnirsi DSO-TC2, Manual

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A: The mains power grid is generally polluted and contains more high-order
harmonic components.The superposition of these harmonics on the sine
wave will show a distorted sine, which is a normal phenomenon.
Generally,the mains waveform is distorted and has nothing to do with the
oscilloscope itself
4: Why is the measured mains 220V waveform not a
very standard sine wave, with distortion ?
A: Please unplug the probe and USB cable.Press 【AUTO】 button to enter the
calibration confirmation interface,Then click the 【OK】 button to enter the
automatic calibration
5: Why is there no signal input,The baseline (OV) on the
screen and the arrow on the left (OV indicated) are not
the same, there is a relatively large offset ?
A: Because the turn-on or turn-off voltage of the MOSFET or IGBT is greater
than 5V (the maximum supply voltage of the chip)As a result, the MOSFET
or IGBT cannot be turned on or off normally.Therefore, only its equivalent
parameters can be measured
6: Why do the results obtained by measuring MOSFET
and IGBT are diodes, capacitors and other parameters?