[volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter
Dr. David Kirkby (Kirkby Microwave Ltd)
drkirkby at kirkbymicrowave.co.uk
Sun Jan 24 17:20:36 EST 2016
On 24 January 2016 at 22:16, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 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
> >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.
Thank you. That is certainly important if that's the case. I can't seem to
find a data sheet on the exact SRAM in my 3457A (Toshiba TC5564PL-15), so
difficult to know.
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