Posted by lastcowboy32 on July 07, 2016 at 18:02:21 from (74.79.46.42):
In Reply to: Isolation Transformer posted by Moonlite37 on July 07, 2016 at 06:03:23:
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No floating is required anymore. O'scopes now have very good differential probes. I learned about floating scopes from a now-retired co-worker who designed TV flyback transformers back before I was even born. He always had a three prong to two prong " cheater" or isolation transformer in his toolkit for such things. Me? I either use differential probes, or two grounded probes and waveform math...or a newfangled battery powered scope\meter.
Isolation transformers are also not the best method of isolating noise from one circuit to another in all cases. Parasitic capacitance between windings will couple higher frequency noise right across. They may or may not be good noise filters. Depends on the spectral content of the noise and the magnetizing inductance, parasitic inductance and parasitic capacitance of the transformer...among other parameters.
Labs that do conducted emissions measurements and conducted immunity tests use a LISN or Line Impedance Stabilization Network to filter out noise from the device under test. There is usually an isolation transformer inline also to keep the phase to ground leakage current from the LISN's oversized "Y" (phase to ground) capacitors off of the building mains.
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