[volt-nuts] ...a guide to buying the HP/Agilent 3458A

[Poul-Henning Kamp]

In message <BLU125-W1344CCFFC33888237BDCA0CE0F0 at phx.gbl>, Mark Sims writes:

>If the batteries go,  you will need to replace the chips and do a full cal.
>  If your chips are old and you are having a full cal done,  it would be be
>st to replace them.  A full cal will set you back around $500.  The chips s
>hould be around $50...  cheap insurance.

...or provide them with an external backup-supply higher than 3.0 and lower
than 4.5 Volts.

At 4.5 Volts the chips go into Read-Only mode and the internal backup battery
is a 3V lithium.

I have not tried this on the 3458A yet, but I have used this trick in
other kit.

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