My 8568B display section has developed a fault, on which I would appreciate some where to start looking advice. The SA powers up fine and trace is normal. After a couple of minutes the display brightness starts flashing and I have to turn up the intensity to see the data as well as the graticule. A little later, the graticule and data gradually expand so that they are overscanned by maybe 100%, suggesting, perhaps, an EHT fault. If I switch off and let the instrument cool right down, the same sequence repeats. The display and RF section prefixes are 2601, 2542, suggesting that I have the display with the 18kV PDA. Having to make all measurements in a 2 minute time window is a bit of a restriction, so any advice gratefully received.
dou you have a aux monitor output on your HP8566 ??If yes connect a TFT screen on it and look if the same problems are on that TFT screen , if no problem you CRT have some problems.
grts Dirk
Thanks for your advice. I have looked at the XY outputs and the display is fine and stable, pointing, as you say, to an EHT fault. The question is where to start diagnosis on this assembly?
Regards,
Alwyn