Re: Keithley 197 troubleshooting

"DaveM" <masondg4499@xxxxxxxxxxxxx> wrote in message
news:Z6adnXeiDNYyvGrYnZ2dnUVZ_veinZ2d@xxxxxxxxxxxxxx
"Dan Lenski" <dlenski@xxxxxxxxx> wrote in message
news:1173818867.579488.73980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi all,
I have a disabled Keithley 197 DMM. This is an older model, but it
has a nice GPIB interface, so I'd like to get it working.

When turned on, it displays the message "cErr". According to the
manual (http://www.tnw.utwente.nl/onderwijs/practica/doc/app/
keithley197.pdf) this means that there's a problem with the NVRAM that
stores the calibration data. I've tried bypassing this error by
pressing the buttons as recommended on page 5-9 of the manual, however
the cErr reappears.

The NVRAM chip is a little 8-pin DIP chip apparently. I'm having
trouble identifying it. It's labeled:

X2443P
8432ES

Anybody know what this chip is, or can give me any other advice in
getting this DMM working? Thanks,

Dan


The X2443P is a Xicor NMOS nonvolatile static RAM, 16 bits X 16 words,
tristate, 750ns, Vcc = 5V

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
(http://www.acecomponents.com/) but no price, so you're at their mercy.

Cheers!!
--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Life is like a roll of toilet paper; the closer to the end, the faster it
goes.



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