If there's interest and we can agree on a charter, I would be happy to
create a "measuring-nuts" (or similar) list at febo.com.
If so, I'd like the charter to be along the lines of "high
signal-to-noise ratio discussion at the serious-amateur level of
scientific measurement tools and techniques," though the words are open
for discussion.
My point is that I don't deal with the size and noise level of a general
science list, but focusing on measurement tools and techniques fits in
well with the other -nuts lists.
Let me know what you think.
John
----
Frank Stellmach said the following on 01/27/2013 09:10 AM:
Hello Chris,
I don*t know a good scientific forum, either. But I would also be
interested, at least to have some ideas, what to do try out with those
high precision gadgets, I have collected already ;-)
For the question about low temperature measurements, I recommend sensors
following a standard curve, which gives about 0.5K accuracy, or
calibrated ones, which might give 0.1..0.2K for relatively low budget.
Fuddling around with a temperature bath is not necessary, normally.
At university, I have checked my set of sensors with liquid nitrogen,
pure liquid oxygen and He(4).
Today, liquid nitrogen might be accessible, where electronic
manufacturing is done. (The gas is used for reflow process)
I have used PT100 sensors down to pumped liquid nitrogen at 63k, and
much less.
A good 4 wire Ohm DMM with Offset Compensation is required, or a
precise, switchable 1mA DC source.
The most versatile sensor was a standard table Si diode, e.g. the DT-470
from Lake Shore; it works between 1.4K and room temperature, but
requires a precise 10µA external current source, (easy and inexpensive
to build on your own) but no offest compensation.
http://www.lakeshore.com/products/Cryogenic-Temperature-Sensors/Silicon-Diodes/Pages/Model-Landing.aspx
1% grade NTCs are fine for temperatures down to -55°C.
Frank
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