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Old 23-03-2010, 18:54   #16

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Bill, how come the mastec rolls over on "6"x ranges, rather than 1.999 like most meters? Odd, isn't that?

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Old 23-03-2010, 20:21   #17
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Hmmm.....dunno. Maybe it has something to do with the internal clock rate or the sampling rate chosen for this design.


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Old 23-03-2010, 21:58   #18
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Yes, I was a bit too quick with that link. I got the meter out and it is model DSA-540A. It does both AC and DC amps, but I see it's at the $95.- price level. It's commonly available.

A Fluke 113 @12V DC has a precision of 2% + 3 so I think the Sperry isn't too bad. For most work, more precision isn't needed.

Yes, the good old 180 series @ 0.025% + 5 accuracy. It will be accurate to within 1/100 of a volt. But we're talking $400-$500 now.

If you look at a 0.8% +3 or so accuracy, what can you do with that which isn't possible with a 1.6% +3?

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Old 24-03-2010, 08:31   #19
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Ken, getting back to the original problem, have you made any progress?

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