WTB: HP monitor 82912A (82913A)

[Paul Berger (Canada)]

(03-31-2015 08:27 PM)Dave Frederickson Wrote:  

(03-31-2015 08:02 PM)Marcus von Cube Wrote:  Jitter may be the result of the power supply frequency being different from the refresh rate of the video interface. If you have a 50 Hz video signal on a display connected to 60 Hz power you may see a constantly wobbling image. This is my experience from the late 70s when monitors were essentially cheap TV sets without a tuner.

Thanks, Marcus. The 82163 is an "A" so both the refresh rate and power line frequency are 60Hz. I was going to try the TV Out to see if it was jittery, too. Any suggestions would be greatly appreciated.

Dave

Nearby transformers will will also cause waving and jitter on a CRT it does not take a lot either, I have seen power cube for a portable CD player mess up the image on a 19" Sony CRT. Nearby motors both universal and synchronous will do that too. I remember taking a call where a customer complained her CRT was wavey and when I arrived at her desk I spotted a small air cleaner beside her terminal so I turned it off and asked her if that was better, and of course it was. The oddest one was a desk that was adjacent to a wall with an elevator shaft on the other side, the CRT would go nuts when the elevator car went by.