Discussion
Which verification follows isolation of a high voltage system?
Answer: A
The meter is proved on a known source, used to confirm zero volts, then proved again. A visual check alone is insufficient because capacitors hold charge. Resistance measurement on a live system is dangerous and meaningless. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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