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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

Shane, Please take at least one picture of that board when you pull it out.? We don't have any picture of it now. Hank

Just found out the E6380A (electroluminescent version of 8935) has a coin cell for the internal backup battery, not a cylindrical like the 892X series. It's a beefy one rated 1 amp hour: CR2477.

Hi Shane, I am working on reviving a HP 8921A, that has the memory battery of 3V that is PCB mounted LIPO type. These batteries will supply quite a bit of current. The AAA Battery may be too much

Hello all, Just obtained an HP 8935 test set that has been sitting unused for several years. Upon power up the display indicated "AA memory battery low. See HELP menu" I removed the rear cover and

What is the Hi-Stab option module in the 8924C?? Does it power only the oven in stby or the osc. too? I was hoping to provide the capability in my 8920a with a 08920-61035. I haven't found a CLIP for

I tried a second A16 board. This one gives the same "Calibration checksum incorrect. Writing to default values" message, but continues to boot. At the completion of booting, it says something about

Not to Hijack, but what is the module in the 8924C?? Does it power the oven only or the osc. too? Actually, I have also kept an old IFR with analog meters and TCXO calibrated at room temp after 5

ERROR 223 error is not caused by the power supply PSU, it should b

thanks for the info but unfortunately my power supply put on another 8920 works correctly (at least when I tested it a while ago) now I also have other problems and, perhaps because of me. I am angry

On Tue, Aug 9, 2022 at 06:00 PM, @DonBox wrote: > > On Tue, Aug 9, 2022 at 05:34 PM, zl1cvd wrote: > >> I have seen 2 causes for this type of fault. >> * Faulty power supply - check all power rails