That's assuming that one bit is one mil, yes? I've seen Protel measure mils up to 3 or 4 decimal places.
That would make a difference.
Indeed. As was pointed out, this won't explain the issue, but the assumption would be that one bit is on microinch, not 1 mil. And, indeed, one bit might be a smaller positional value. And measurements might be made to more accuracy than the positional data, perhaps at least one more decimal place, i.e., a tenth of a microinch. However, 99SE performance is pretty flaky in the microinch region, so I don't think it would be far beyond a microinch. DXP may have changed this. It could be tested... I don't have the time. If anyone is sufficiently interested, asking the question on the DXP list would probably be the easiest way to get the truth from the proverbial horse's mouth.
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