Good afternoon!
On Wed, 9 Feb 2022 00:50:58 -0500
Illya Tsemenko <[email protected]> wrote:
> Any improvement on your 3458A results? I've got L&N 4040-10k resistor
> and logged it for a bit last night. This standard was just random ebay
> special, nothing fancy.
After a few months of measurment I can report the following things:
My HP 1kΩ and the L&N 100Ω resistor both behave like they should
in terms of temperature coefficient (within the bounds of my
measurement accuracy) and in terms of DELAY, APER and NPLC.
The L&N 10kΩ resistor, while its tempco seems to be about right,
has a long settling time. Even with a 10s DELAY, and a 1s APER
measurement, the measured resistance still varies by about 0.3ppm
when changing DELAY +/-1s. While the HP 1kΩ and L&N 100Ω do not
show any such behaviour.
Does that mean that my L&N 10kΩ is defect? Or is this a general
problem with that type of resistance standards?
Or in other words: Would it be worth it to get another L&N 10kΩ
off ebay or would I face the same problems with that one as well?
Other 10kΩ resistance standards seem to be quite rare or so
expensive that I'd rather buy a new one from Fluke or IET.
Another interesting tidbit is, that the first resistance measurement
after an ACAL (a complete one) can be off by as much as 10ppm in
either direction. All subsequent ones are within the expected
noise band. At least with APER, haven't done enough measurements
with NPLC to say anything about that.
Attila Kinali
--
The driving force behind research is the question: "Why?"
There are things we don't understand and things we always
wonder about. And that's why we do research.
-- Kobayashi Makoto
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