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If you where building using a PIC, of course, you could replace the oscillator with an output from the PIC and have your test frequency set by software... if you wanted.
I use a scope because that tells me the whole picture.
There are a number of problems with that though
1) It's far more expensive.
2) It's far larger.
3) Far slower to use.
4) (and most important) it can only be used on equipment that actually works.
I do use the scope method occasionally though - mostly when you can't easily get to the bottom of the board - and while you can't usually get to the caps with a scope from the top, you can usually get to at least 'some' of the rectifiers.
But you can't be a service engineer in the 21st century (or later part of the 20th) without an ESR meter.
Long Life are usually 105'C rated vs lower temp. (85'C)
I was busy soldering up a board to try out some ideas on. Been reading here found away to get .4 volts and 5 mA to 150 mA some what of a sine wave from the pic's pwm and a small hand full of parts. By looking at some done with a arduino.Hi Burt!!!
Are you still there..... Your thread seems to be going sideways...
If it can be done with an AVR, I think its more than possible with a PIC... There are many circuits on the net for PIC ESR meters..