I'm trying to get my head around the AC cal procedure for the HP 3456A -- there is no full-scale cal, just some extremely finicky tweaks for the bottom ends of three of the four ranges. I really don't understand how this is supposed to work, especially since it is very accurate on all DC ranges (up to 500V -- above that some heating of the divider R seems to occur and it loses accuracy as the voltage increases). But on AC, the tweaks don't result in anything like an accurate level reading compare to my 3458A -- at 10VAC it is off by hundreds of ppm. Anybody shed any light on this? Is there a way to get full scale cal points in AC mode? Any mods to fix this -- lovely meter otherwise; I much prefer it to the 34401A I used to have, except for the overall bigness....
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