[volt-nuts] Power consumption of 3458A reference board / fitting one in a 3457A

[Dr. David Kirkby (Kirkby Microwave Ltd)]

On 23 September 2017 at 18:03, Tom Knox <actast at hotmail.com> wrote:

> If you want I will send you a few to play with for a few months.
>

Thank you very much. I'd like to have a play. I sent you a private email.

Someone suggested using the DCV:DCV ratio mode to look at two references,
but I don't see this facility on the 3457A. I think the only way to compare
two of them would be to put them in series, but back-to-back to subtract
the voltages, and look at the difference on the 3457A.


>
> Thomas Knox
>

It's odd there's someone selling LTZ1000A chips on eBay at $50 each.

http://www.ebay.com/itm/1x-LTZ1000ACH-Ultra-Precision-Reference-LTZ1000A-/111325506311

It looks like they have been removed from PCBs with a sledge hammer - they
are heavily scratched and/or dented. The sellers seems to have sold quite a
few, yet the chips are only marginally more expensive if bought new from
the manufacturer.

Dave