On Tue, 25 Jun 2019 at 13:02, Mitch Van Ochten <[email protected]>
wrote:

> Do you know that YOUR resistor has 2 ppm/deg C drift, or is that the
> maximum
> allowable for the part number?  Many times they perform BETTER than
> specified.


I believe 2 ppm/deg C is the specification. I am not even 100% sure of
that, as I only have a Keysight part number 0699-3404 <0699-3404%20400>

https://www.keysight.com/my/faces/partDetail.jspx?partNumber=0699-3404

If 400 k ohm was not such an obscure value I would have fitted a higher
specification resistor, but there’s very little choice in 400 k ohm.

There is a service note on this instrument that indicates the 400 k ohm
resistor drifts, in some serial numbers. My instrument is missing the
serial number, so I purchased a resistor just in case mine is fitted with a
dodgy resistor.

Dave.

-- 
Dr. David Kirkby,
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