Electronics > Beginners
Safety Caps and ESR
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wraper:

--- Quote from: dmills on February 14, 2019, 10:34:43 pm ---
--- Quote from: wraper on February 14, 2019, 05:44:11 pm ---Many ESR meters don't go above 20 ohm or so.

--- End quote ---

You need better gear!
The venerable HP 4192A never mind its more modern equivalents from HP/Agilesight, Boonton and the rest will all measure ESR to many k ohms. Also, most of the old school manual bridges would get it done, this ESR meter with naff all range is a very modern thing.

This is an excuse to get your gear buying hat on!

Regards, Dan.

--- End quote ---
But it's completely unsuitable tool to use for everyday repair. And you need to pray god you won't accidentally stumble across some charged cap. As for actual repair, ESR meter usually is better than proper LCR meter. Works faster and cares less about components connected in parallel.
T3sl4co1l:
Infinite ESR would read zero capacitance. Think about it. :)

Safety (Y type) caps are usually employed between mains, and ground or output.  They are rarely bigger than 4.7n, due to ground leakage current.

Tim
Cliff Matthews:
Welcome! Feedback is often via optocoupler (like PC817) or inductor straddling over the PCB isolation area. Since you don't have schematics, can you post a picture and/or some part numbers? and also what tests you've done on the secondary side.
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