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peak-to-peak value below is 620V,Press [MENU] to enter the menu page and
select measurement,Select RMS (root mean square), press the [[OK] button,At
this time it is the 220V vo ltage that is often said,The mains voltage RMS
fluctuates between 180~260V,So the peak-to-peak value is in the range of
507~733V.
11.Why the measured mains 220V waveform is not a very standard
sine wave,Is there distortion?
Answer:There is generally pollution in the mains grid,Contains more high-order
harmonic components,When these harmonics are superimposed on a sine wave,
a distorted sine will appear.normal phenomenon,Generally, the mains
waveform is distorted,Has nothing to do with the oscilloscope itself.
12.Why is there no signal input,The position of the baseline (0V) and
the left arrow (0V indication) on the screen are different,Is there a
relatively large offset?
Answer:Please unplug the probe wire,Press [MENU] to enter the menu
page,Select (calibrate) and press OK to calibrate.
13.Why is the signal voltage above 5MHz attenuated
significantly?Feel the bandwidth is only 5MHz?
Answer:When measuring above 5MHz,Need to move the probe to the 10X
gear,And the oscilloscope should also be set to 10X input mode,Because the
probe cable of the oscilloscope itself has a capacitance of up to 100~300pF,"It's
a big capacitor for high-frequency signals!The signal has been greatly
attenuated after passing the probe to the input end of the oscilloscope.The
equivalent bandwidth is 5MHz,So in order to match the hundreds of pF of the
probe line,Attenuate 10 times at the input end of the probe cable (switch at 10X
gear),So these hundreds of pF capacitors are just used for impedance
matching,The bandwidth at this time is 100MHz,Note that only the matching
100MHz probe can be used.
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