[Test-Equipment] CORRECT BATTERY VOLTAGE AND TYPE FOR HP3586A SLA

[J. Forster]

The battery powers a single RAM chip when the main power is off. It is noted as 2.5 V on the print. There is a circuit that controls the CE (chip enable) from the battery  and the +5 VDC supply.

I didn't look up the part but it's virtually certain it's a 2 cell NiCd battery, with the cells end to end.  Try Digi-Key as I said some days ago..

The battery is charged by an about 10 ma current source (23 V @ 2.7K)

-John


garyschafer at comcast.net wrote:

> Hi J,
>
> I have a 3586C that has a bad battery. It had leaked on the board and caused power supply problems. I cleaned all the residue from the battery off the board and it worked ok. I am now operating it without any battery at all. I don't know what the voltage is supposed to be or what it is for. I am guessing it is for memory of some of the front panel settings.
>
> Regards
> Gary  K4FMX