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Entry  Thu Mar 21 16:56:42 2024, Tyler, Update, DAQ, RTD Parameter Calibration RTD_Calib-2.pngIMG_8569.jpg
    Reply  Mon Mar 25 10:55:33 2024, Tyler, Update, DAQ, RTD Parameter Calibration RTD_Calib_nobeta.png
       Reply  Tue Mar 26 13:51:56 2024, Tyler, Update, DAQ, RTD Parameter Calibration Screenshot_2024-03-26_at_1.23.27_PM.png
       Reply  Mon Jul 29 13:39:16 2024, Tyler, Update, DAQ, RTD Parameter Calibration RTD_Recal_params.pngRTD_recal_plots_fin.png
Message ID: 355     Entry time: Tue Mar 26 13:51:56 2024     In reply to: 354
Author: Tyler 
Type: Update 
Category: DAQ 
Subject: RTD Parameter Calibration 

Another re-fit, but this time the quadratic coefficient (beta) is set to 1.003e-6:

       R_0 (ohm)   Alpha (1/C)

RTD 0   79.7386   0.001863

RTD 1   78.6248   0.002359

RTD 2   81.3254   0.002211

RTD 3   74.6127   0.003509

RTD 4   80.6652   0.001988

RTD 5   78.5450   0.002127

RTD 6   77.0144   0.002268

RTD 7   83.0204   0.002288

Quote:
Refitted RTD calibration, neglecting quadratic term:

       R_0 (ohm)   Alpha (1/C)

RTD 0   79.3962   0.002031

RTD 1   78.2874   0.002530

RTD 2   80.9775   0.002381

RTD 3   74.2947   0.003684

RTD 4   80.3199   0.002157

RTD 5   78.2106   0.002297

RTD 6   76.6825   0.002438

RTD 7   82.6645   0.002458


Measurements taken can be found here. An uncertainty of 1 C was assumed for temperature.

Quote:
[Jon,Tyler]

We noticed that the RTD temperature readings given on the Cymac were off, and traced the issue to miscalibration in the relationship between the resistance and temperature of each RTD (Callendar-Van Dusen eqn). Below is the table of values inferred from independent measurements of temperature and resistance to rectify this problem. This data was then fitted to better determine the coefficients present in the temperature-resistance relation:

       R_0 (ohm)   Alpha    Beta

RTD 0   80.8674   0.001315   4.273e-6

RTD 1   79.5704   0.001887   3.7873e-6

RTD 2   81.7334   0.002014   2.1724e-6

RTD 3   74.3060   0.003677   3.6022e-8

RTD 4   81.1350   0.001761   2.3598e-6

RTD 5   77.9610   0.002423   -7.5192e-7

RTD 6   78.7980   0.001373   6.2909e-6

RTD 7   83.8616   0.001890   3.3529e-6

 

 

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