I recently acquired for cheap an old HP 740A DC standard/voltmeter of
1960s vintage. It seems to be pretty clean inside and complete except
for missing a small bias cell. I'm trying to find a manual - found
the "B" version one so far at hparchive.
Before putting in much effort to fire it up, does anyone have
opinions on whether it's worth keeping and fixing - does it have
decent performance by today's standards, so to speak? There's a
sticker inside that showed that (sometime in the 1960s) the reference
deviation was no more than +/- 5 ppm recorded over a four week
period, under some kind of test conditions.
Ed
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