Re: 2445 “A” sweep Issue
Hey Chris,toggle quoted messageShow quoted text
it'd be mighty useful to see pictures of how your scope behaves, as I'm not
sure what "the start of the “A” sweep is off the CRT to the left" means. If
you input the calibrator signal to a channel and trigger on it, you should
be able to position the start of the sweep off the right and left edges of
the CRT as I recall. Does the horizontal position control work?
If you enable both A and B sweeps, do they start at roughly the same point
on the CRT?
Also note that the calibrator has a fairly precise frequency that adjusts
with the sweep speed you select to maintain 5 cycles of the square wave on
the CRT (up to point). You can therefore use the calibrator to assess
whether your sweeps are reasonably calibrated and whether they're linear.
The 2445 is all drive by wire, where control voltages generated on the A5
board are used to set the sweep timing and the vertical gain of the scope.
The horizontal position control is one of those control signals, though it
should apply to both sweeps equally.
Sweep timing is also governed by control signals that are set through
calibration, so it's possible that some or all of your A sweep timings are
So far you're not giving us a whole lot of information to point you in
profitable direction though.
On Thu, Sep 10, 2020 at 11:09 PM <email@example.com> wrote: