To accurately balance this op amp circuit at high frequencies,
add a small trimmer capacitor across the 10k feedback resistor.
We've used this circuit in research on HV switching power converters,
and it can work quite well, if carefully constructed.
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Where is the scope probe grounded? What is the voltage difference between that point and the chassis? That voltage will be present on the chassis.
Isolation transformers are great for removing hum loops. They do not prevent dangerous high voltages from being dangerous high voltages.
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