Hi Xing Weibing:
> 2. supply the SMPS from an isolating transformer where
> both supply conductors are isolated from ground.
> 3. connect secondary's ground and primary 's ground (neutral and ground
> are connected together)
This is the correct connection for measuring the
primary-to-secondary voltage.
> What I mean originally is what waveform of primary and secondary for SMPS
> should be :
> Switching waveform , sin waveform moduated by high-frenquency switching
> waveform or other .
The correct SMPS waveform between primary and
ground (i.e., grounded secondary) is a switching
waveform superimposed on a (mains-frequency) sine
wave.
Best wishes for the New Year,
Rich
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