On Tue, Dec 19, 2017 at 5:19 PM, NigelP <nigel-pritchard@...> wrote:
So, further investigation demonstrates more of what I've already noted. Scenario: 7904AI've just tried this on my 7904A and I also get some readout bounce,
but very little. If I position two traces in ALT mode, one at the top
and one at the bottom of the screen, so they're only just not visible,
the readout bounces a very tiny amount (timebase at 10ms/div), much
less than 0.05 divisions. You really have to look carefully to see it.
If I crank the Y position knobs to their maximum possible extents, I
can get the bounce up to about 0.1 divisions, but that's the extreme.
This 7904A hasn't been refurbished other than a slight tweak to the Y
gain and to one of the thermal compensation adjustments. I use it in
my work almost every day and the readings it gives appear to be
accurate when compared with other instruments I use. It doesn't have
traceable calibration but I'd say it was within spec.