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Brian.VK5VI I did try to reply to your email but it bounced ....looks like the server took the summer off 8)

normally I now just do the output caps as well as the one small cap in the high voltage area ( 47uf 63V IIRC )? Opinions vary of course but when you have done as many as I have you start adjusting to

Gidday All, Bill VK6II I just did My 8921A PSU and read the manual to see how to extract it. Slide off the cover to reveal the works inside, undo the nuts on the BNC connectors to the Spec An section

Hi again Mike Look at the groups file area, most of what you want is there including the 8920A CLIP. The assembly level service manual may not be, but was available on the Keysight web site, if not I

Hi Mike Yes do not try to remove the power supply without first removing the push rod, if you do you will certainly damage or destroy the push-rod, the instructions are in the service manual which is

Rick does a great job and picks up all the widely known issues. I shipped mine to him from the UK and back. His Retirement may not be so long away, don’t wait too long…. V 73, Colin G4CWH

So, my trusty 8920A decided to groan and stink now when it’s turned on versus booting into normal operating mode. Leads me to believe it’s cap replacement time and/or a few other parts. So,

Thanks to all who replied to my question. I had success setting the DAC's and running Per-Cal on my 8920A. It went from 2445 HZ off at 950MHZ to 6 HZ off. Neat capability! On Mon, Oct 10, 2022 at 9:24

My interest in all this was to be able to back up saved screen setups to my computer HD, but it seems I can only write them one at a time to a card, or to format a card (LIF?) with all the saved

Per_Cal means periodic calibration and Ref osc is one that should be checked every 6 mo. and maybe every couple of days at first to make sure everything is OK. Yes your GPSDO is fine so long as the

Jim, you GPSDO is fine for this. I turn mine on for a day or 2 before I intend to use it. Most come from CDMA cell sites so have to lock pretty quick for power supply cuts and such. I think PER_CAL

I would suggest you first find a stable signal source that will allow you to map the warmup characteristics of your instrument over time. It is easier to get an idea from a signal at 500Mhz as opposed

I have an HP 8920A that I would like to run the Per-Cal proceedure on but I don't have a good description about how to do it. The manual says very little about what all the steps are. I have another

Hi Ade, I have downloaded your Data.txt, and wondered how you did it ? I am also working my way through a the HP8921A. I also found C7 in the power supply blown. I bit the bullet and replaced all the

Photo of actual board with backup battery soldered in. Looks to be the original battery. Thanks Zl1cvd for your photos showing a battery holder. I was wondering if a holder would raise the overall

Hank, Thank you for the information. This should point me in the right direction. I'll post a photo of the memory board when I get it out. Seems like the CR2477 would be in a socket already, but of

From the same E3680A manual, here's the memory board location diagram attached. I just noticed the manual was mistitled upon upload making it hard to find so that's fixed now. E6380A Assembly Level

Rick, Thanks for the very helpful advice based on the actual experience of replacing that internal coin cell.? I'll eventually have to do this. For those that might be already planning a Digi-Key

Guys: I own an HP 6381A with the on-board back up battery on the memory board. Since these batteries are becoming increasingly difficult to find with the leads welded to the battery body, I recommend