PMEL Forum

K Sections => K5/6 - Physical Dimensional => Topic started by: Hawaii596 on 08-19-2019 -- 13:19:16

Title: White Papers on SPRT Stem Correction Error
Post by: Hawaii596 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.
Title: Re: White Papers on SPRT Stem Correction Error
Post by: Mr M. 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.
Title: Re: White Papers on SPRT Stem Correction Error
Post by: Hawaii596 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. 
Title: Re: White Papers on SPRT Stem Correction Error
Post by: flew-da-coup 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.
Title: Re: White Papers on SPRT Stem Correction Error
Post by: silv3rstr3 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.