Keithley 197 troubleshooting

The X2443P is a Xicor NMOS nonvolatile static RAM, 16 bits X 16 words, tristate,

I searched briefly for anything that would be a good sub for it, but came up empty. Maybe you can do better.

I forgot to mention that the X2443 is a serial 16x16 RAM. I did happen to find one web site that lists the X2443 in stock

Cheers!!

Thank you, Dave! Sounds like it's a pretty obsolete part :-) Maybe someone makes a pin-compatible serial RAM in a larger size?

I think I'll do the other tests on the device to make sure everything else is working, then try to track down this part.

By the way, how'd you find out what it is? Alldatasheet.com and Google weren't much help to me.

Dan

I found it at

Cheers!!!

basic

We scanned several Xicor data books for our datasheet site but didn't realize they were scanned at the wrong resolution. The books were sent for recycling before we realized. This is one of those scans which gives some detail on X2443.

It's almost unreadable but here it is anyhow.

Regards DatasheetArchive.com

Thanks for the follow-up!!! Very kind of you to post those pages. Databooks going to a recycler!!!!???? ACKKKKKK!!!!!!!!!!!!!!!

Perhaps it needs to be calibrated and the error will disappear.

Yeah, I've tried to go through the calibration procedure but it won't go into it... as soon as it begins it puts up the "cErr" message. I think this means the NVRAM is actually dead, not just blanked.

Dan

Dan, I still think it needs calibration. Does the unit have a rear panel cal enable switch or an internal jumper for cal enable. You need a manual if you don't have one. Keithley website may have a downloadable version. When you power up and get the "cErr", press one of the soft keys (rel, db, sto or rcl). That will bypass the error and let it operate with a flashing "c" indicating cal constants lost. The manual i have indicates different cal procedures for the different firmware versions. You need a manual. BTW the soft keys (previously mentioned) need cleaning or they don't makle contact. Good Luck, Kevin

Kevin, thanks for the tips. I do have the manual, and have tried this. Unfortunately, when I press one of the soft keys it flashes all zeroes (like when just turned on), and then returns to the cErr message in about 0.5 seconds.

The manual doesn't say what to do in this case, although it says to try replacing the NVRAM IC if the cErr persists...

Dan

Damn it's a good meter too, lots of digits. If you really need it, Keithley always provided good service at reasonable rates. I don't know if they will service that model. I have a Keithley 197 on my bench at work. I keep it for the min-max function to "trap" intermittent problems. Good Luck, Kevin

And, they do sell parts... Peter