[volt-nuts] Stabilising resistors

[Will]

The HP calibration set that I used had cheap SMD chip resistors (!)
inside, which behave nicely up to several hundred MHz. The overall
high frequency performance is determined by the layout and connections
which are critical.

The resistors drifted a lot as expected and were checked before every
calibration with a 3458A. The high frequency behaviour was assumed to
be constant (enough) and the small parasitic inductance and
capacitance were taken from the HP calibration certificate.


2015-08-16 10.06 UTC+03.00, Dr. David Kirkby (Kirkby Microwave Ltd)
<drkirkby at kirkbymicrowave.co.uk>:

> Is there realistically anything I can do to stabilise these resistors? I
> don't want to go to the expense of adding Peltier temperature controllers
> to them.
>
> I suspect the fact that they are several years old means that they are as
> stable as they are going to be, but I just wanted to check if there is any
> improvement that I could make. I expect thermally cycling these in an oven
> and fridge would do more harm than good,  but perhaps I am wrong.