Generating the AC isn't a problem. For 60 hz, a variac is fine. For higher frequencies, an audio transformer, for example, a plate transformer, and a signal generator will do the job. You don't need any power since a DVM has a high input impedance. You only need the voltage with enough drive to handle the circuit capacitance. A plate transformer run backwards will do the job.
You still must have a standard to compare to. It should be between 3x and 10x the accuracy of the instrument you're testing. One of my favorites for this role is the Fluke 8800 5.5 digit DVM. This is an oldie but a goodie. It was one of the premiere meters in its era and so there were a lot of 'em in use. That means that there are a lot of 'em surplus now. I have several in my lab and I've never paid more than $50 for one, usually a lot less. My experience over several decades is that the 8800 holds its calibration as well as any non-microprocessor instrument I've ever worked with. John On Tue, 25 Dec 2007 14:01:02 -0800 (PST), Randy Leifer <[EMAIL PROTECTED]> wrote: >I don't need super accuracy, just within reason to >ease my mind. I have some decent gear already: >http://i5.photobucket.com/albums/y177/Midiot/DSCN2695.jpg >...and a few units, what I believe to be close to >"secondary references". >Frequency intrigues me, but my main hobby is to test >my DIY hi'end audio gear. So, I have: audio distortion > meters, AC voltmeters, low distortion audio freq >generators....that I'd like to check if they are close >to their factory specs. And I have most of their >manuals/cal instructions too. > >(btw, when I said "power amplifier" in my original >post, I am refering to an audio power amplifier.) > >=Randy= -- John De Armond See my website for my current email address http://www.neon-john.com http://www.johndearmond.com <-- best little blog on the net! Tellico Plains, Occupied TN What do you call 4 Blondes in an Abrams? Air Tank. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
