I'm considering purchase of an HP3457A for use in metrology, primarily for setting DC voltage with 7.5 digits of precision. It seems that I can purchase an HP3457A for a few hundred dollars, calibrated. I've reviewed the datasheet, and the operating manual, I can't see how it extracts the last extended digit in what appears to be a 6.5 digit meter in all stated specifications.
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I realize that the counting speed is very low at that high resolution, and there may be better quality or faster choices. I'm on a budget for this one, I have bought discounted Solartron meters in the past and am quite happy with that value as well.
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Bottom of the test equipment market here, could a HP3457A be made to display 7.5 digits in DC volts as-is?
