Kevin Wood G7BCS
3. The DC Restorer circuitry is not working properly. Kevin, I'mYep, that's it. You can regard it as a network that turns the Z axis
signal (let's say it varies from 0-100V for the sake of argument. I'm not
sure on the exact range) into an AC signal with an amplitude of 0-100v.
That signal is then coupled into the cathode circuit where it's rectified
again, so it appears as a -2000V to -2100V signal. C855 bypasses it to
improve the transient response.
So here's my dilemma: The manual lists a bunch of equipment needed to
Based on the above assumptions I've ordered a Fluke 80k-6 probe to checkI wouldn't say so at this stage. The DC restorer just needs the diodes and
resistor values around it checked. That can be done with the fluke.
Only thing that might be handy is another scope to check for ripple on the
power supply circuitry although if the ripple is not present when
measuring the calibrator signal it makes me wonder if it's the ground
connection in your probe that's the problem.