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FSD= Full Scale Deflection. Apologies. I'm old and my references are perhaps stuck in the past. I built mine from a schematic I found on the web but I no longer have it and it disappeared long ago. I just used my cheap Chinese tester and it gives the ESR of film caps, too. I have this one and its also useful for checking through junkbox transistors. The price has now increased a little in the 2 years since I got mine;
https://www.ebay.co.uk/itm/192891876192
I get what olddawg is saying. My experience is different overall though and I still like my ESR meter and it works for me. I agree that where I'm seeing high ESR on a board of SMD electrolytics I do replace all the ones of that type, sometimes the whole lot. When I see those little 2uf electrolytic coupling caps in 70s Peaveys, the same thing - a few will read high if you did care to measure them, but through exprerience you know that they will all need changing as they're always either bad or heading that way. Again, it comes down to your personal preference and what works for you.
https://www.ebay.co.uk/itm/192891876192
I get what olddawg is saying. My experience is different overall though and I still like my ESR meter and it works for me. I agree that where I'm seeing high ESR on a board of SMD electrolytics I do replace all the ones of that type, sometimes the whole lot. When I see those little 2uf electrolytic coupling caps in 70s Peaveys, the same thing - a few will read high if you did care to measure them, but through exprerience you know that they will all need changing as they're always either bad or heading that way. Again, it comes down to your personal preference and what works for you.
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