Finding resistance for NTC Thermistor @ 25C

[sighman]

1. Homework Statement

Find the resistance of an NTC thermistor @ 25C, given a B value of 3950 K, operating temperature of -55C - +125C, with resistance ranging 5-100 kohm.

Basically I framed this as a question from the thermistor's respective datasheet (found at http://www.chipcatalog.com/Cantherm/MF52A683J3950.htm).

Homework Equations

[URL]http://upload.wikimedia.org/math/5/f/5/5f5cad47a4ac763753cefb833e3dc877.png[/URL]
From wikipedia's B value section of the thermistor article.

3. The Attempt at a Solution

Since this is an NTC thermistor, I assume that resistance @ 125C is 5kohm. Using this as my reference, I have

R₀ = 5
B = 3950
T = 298.15
T₀ = 398.15

My answer is 139kohm is which ~2 the solution.

The correct solution is given as ~ 68k for the thermistor @ 25C.

 

[KataKoniK]

I would first check my calculations to see if there were any errors or mistakes. I would also double check the values given in the question to make sure they are accurate. Additionally, I would check the thermistor's datasheet to see if there are any specific equations or formulas that should be used for calculating resistance at different temperatures. If there are no errors in my calculations and the values given are accurate, I would consider the possibility that the thermistor may not behave exactly as predicted by the B value equation and may have some variation in its resistance at different temperatures. In this case, it may be helpful to consult with the manufacturer or conduct further experiments to determine the most accurate resistance at 25C for this specific thermistor.