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Mystery47

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  1. I'd like to ask OMNI a question (if he's still alive). He wrote his answer in 2007 and I'm asking in 2021. Anyway Omni, you recommend using a GFCI for safety. Then, you also recommend having a Variac and an isolation transformer. I understand having a Variac. When powering up an unknown condition piece of electronics like an old Tektronix oscilloscope it would be best to slowly raise the input voltage slowly in case there was a bad short in the scope. But I've been reading pros and cons about using an isolation transformer especially if the device under test and the test equipment are all plugged in to the same isolation transformer. I've got the idea that the only time to use an isolation transformer is when working on a device (like an old ham radio or TV) that does NOT have a power transformer. That is, a device with a hot or live chassis as some old time appliances used to have. And then, I would think, only plug the hot chassis device into the isolation transformer and plug the test equipment into a regular outlet or the GFCI. Am I correct? I'm trying to set up my bench so I don't kill myself before the time chosen by the Lord.
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