You clearly know what you are doing and have an extremely good reason for monitoring the AC Mains.
You need to see near instantaneous changes in the input and output. Very few people have that need.
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My comments were intended for 'normal' people with 'normal' needs not some kid with unclear needs.
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The only time I ever needed to monitor the AC Mains was to check the turn of noise burst of a TRIAC based main studio lighting grid. One dimmer produced obscene amounts of jittery noise that drove the TV camera control units nuts.
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I insisted on a 5 foot square of 3/8" Lexan, two isolation transformers for the scope and the fire department EMTs across the road to be present.
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120V on a 100A circuit still frightens me.?
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I ended up with the Lexan sheet and attenuator when they shut down our department.
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My 9K:1K attenuator is probably the safest, or least dangerous non transformer method to measure the AC mains.
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And the university bought the Lexan and resistors!
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