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Author Topic: White Papers on SPRT Stem Correction Error  (Read 273 times)

Offline Hawaii596

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White Papers on SPRT Stem Correction Error
« on: 08-19-2019 -- 13:19:16 »
Anyone know of good white papers on SPRT stem correction error?  I need good details on tests/evaluation  and including them in uncertainty budgets.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

Offline Mr M.

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Re: White Papers on SPRT Stem Correction Error
« Reply #1 on: 08-19-2019 -- 17:42:49 »
From basic to most useful.
http://download.flukecal.com/pub/literature/4137185A_w.pdf
https://www.isotech.co.uk/assets/uploads/Technical%20Articles/Temperature%20Calibration-Depths%20of%20Immersion.pdf
https://www.govinfo.gov/content/pkg/GOVPUB-C13-4f56caf02b22c4ad8773a6b51df0c78a/pdf/GOVPUB-C13-4f56caf02b22c4ad8773a6b51df0c78a.pdf
I really like the discussion in the last pub on page 22 for Table 9, the vertical temperature differences over the length of the re-entrant well of the fixed-point cells. You can try this with a TPW cell but since the ambient to TPW difference is relatively small it may be difficult to see.
Hope some of this helps, good luck.

Offline Hawaii596

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Re: White Papers on SPRT Stem Correction Error
« Reply #2 on: 08-22-2019 -- 18:40:57 »
Thank you. Got them all.  I already have Self-Heating pretty mastered and have a built in calculator added to some of my budget spreadsheets, and getting a lot of the math nailed down in developing uncertainty contributions for Stem/Immersion Error. 
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

Offline flew-da-coup

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Re: White Papers on SPRT Stem Correction Error
« Reply #3 on: 08-23-2019 -- 14:39:48 »
Thank you. Got them all.  I already have Self-Heating pretty mastered and have a built in calculator added to some of my budget spreadsheets, and getting a lot of the math nailed down in developing uncertainty contributions for Stem/Immersion Error.

Hey, when you have it down are you willing to share your work ( spreadsheets )? I am just starting to work on this myself.
You shall do no injustice in judgment, in measurement of length, weight, or volume.Leviticus 19:35

Offline silv3rstr3

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Re: White Papers on SPRT Stem Correction Error
« Reply #4 on: 08-26-2019 -- 17:16:47 »
Thanks for posting those links.  I hadn't read through the NIST SPRT publication before.  Lots of good information. 
“They are in front of us, behind us, and we are flanked on both sides by an enemy that out numbers us 29:1. They can’t get away from us now!!”
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