[volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Jan 24 17:16:32 EST 2016

In message <CANX10hCkNSnxczJx8gccd2-T0J-jOm7yBMncGDviS9iC3yVJjQ at mail.gmail.com>
, "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:

>The SRAM actually gets about 4.8 V
>when on mains, so even a fresh Lithium Thionyl Chloride cell, which would
>be more than 3.6 V off load, would not be too much for the SRAM. So I think
>I am safe for now, but given the cell is at least 11 years old (probably
>much older), it is living on borrowed time.

The one footnote to that is that some SRAMs go into a special "hibernate"
state when VCC drops below a certain threshold.  If this SRAM has that,
you want to make sure the threshold is above the battery voltage.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at 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.

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