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Discussion of precise voltage measurement

3458A NVRAM

David C. Partridge

Tue, Dec 19, 2017 1:27 PM

I'm looking at the A5 board in my 3458A.

The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should likely be
replaced. I think the Ramtron FM1608-120-P is a direct "drop-in"
replacement in this application for the DS1230Y. Is that right? If so I'll
get some in from eBay.

Is there an FRAM direct replacement for the DS1220Y-150? Or should I use a
FM16W08 on a 28 way SOIC to DIP adapter as per
https://xdevs.com/fix/hp3458a_u4/#fram

Thanks
Dave

I'm looking at the A5 board in my 3458A. The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should likely be replaced. I *think* the Ramtron FM1608-120-P is a direct "drop-in" replacement in this application for the DS1230Y. Is that right? If so I'll get some in from eBay. Is there an FRAM direct replacement for the DS1220Y-150? Or should I use a FM16W08 on a 28 way SOIC to DIP adapter as per <https://xdevs.com/fix/hp3458a_u4/#fram> Thanks Dave

Poul-Henning Kamp

Tue, Dec 19, 2017 1:32 PM

In message 000401d378cd$31568960$94039c20$@perdrix.co.uk, "David C. Partridge" writes:

I'm looking at the A5 board in my 3458A.

Make sure to read out a backup copy of the NVRAM via GPIP before you start
desoldering the CALRAM, there seems to be about 25% chance that it looses
contents during desoldering.

See the function "nvram" here for details:

https://github.com/bsdphk/pylt/blob/master/hp3458a.py

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

-------- In message <000401d378cd$31568960$94039c20$@perdrix.co.uk>, "David C. Partridge" writes: >I'm looking at the A5 board in my 3458A. > >The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should likely be >replaced. I *think* the Ramtron FM1608-120-P is a direct "drop-in" >replacement in this application for the DS1230Y. Is that right? If so I'll >get some in from eBay. Make sure to read out a backup copy of the NVRAM via GPIP before you start desoldering the CALRAM, there seems to be about 25% chance that it looses contents during desoldering. See the function "nvram" here for details: https://github.com/bsdphk/pylt/blob/master/hp3458a.py -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.