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

Tom Knox actast at hotmail.com
Sun Sep 24 12:52:06 EDT 2017

Hi Dave;

I am not sure I saw you email, please contact me again off list to work out details.


Thomas Knox
Sr Test and Measurement Engineer
Ascent Concepts and Technology
4475 Whitney Place
Boulder Colorado 80305
actast at hotmail.com

From: volt-nuts <volt-nuts-bounces at febo.com> on behalf of Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk>
Sent: Sunday, September 24, 2017 10:10 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Power consumption of 3458A reference board / fitting one in a 3457A

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.


1x LTZ1000ACH Ultra Precision Reference LTZ1000A | eBay<http://www.ebay.com/itm/1x-LTZ1000ACH-Ultra-Precision-Reference-LTZ1000A-/111325506311>
400°C/W Thermal Resistance for LTZ1000A Reduces. Insulation Requirements. Low Noise RF Oscillators. Standard Cells. | eBay!

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.

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