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Entry  Mon Jun 6 09:45:58 2022, Radhika, DailyProgress, Emissivity estimation, Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate 6x
    Reply  Wed Jun 8 12:15:06 2022, Radhika, DailyProgress, Emissivity estimation, Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate 
       Reply  Thu Jun 9 10:42:26 2022, Radhika, DailyProgress, Emissivity estimation, Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate MS_cooldown_2022-06-02_data.pdf
          Reply  Fri Jun 10 09:47:07 2022, Radhika, DailyProgress, Emissivity estimation, Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate hmfile_hash_88f68a98.png
             Reply  Fri Jun 10 16:23:04 2022, rana, DailyProgress, Emissivity estimation, Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate 
Message ID: 2785     Entry time: Fri Jun 10 16:23:04 2022     In reply to: 2784
Author: rana 
Type: DailyProgress 
Category: Emissivity estimation 
Subject: Megastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate 

From the plot, it seems like the slop is ~50 Ohms / 120 K. So a difference of 5 K corresponds to ~2 Ohms.

It could be that your measurement of the resistance is off slightly due to the lead resistances, etc. Are you using a 3-wire or 4-wire probe?

You can get a higher accuracy relative calibration by dunking all the RTDs together in ice water and then in boiling water.

https://us.flukecal.com/literature/articles-and-education/temperature-calibration/application-notes/how-calibrate-rtd-or-pla

 

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