WR14 / WR50-12/13 Winding Resistance Meter Instruction Manual
The correction formula:
π
π
= π
π
π
π
+ π
π
π
π
+ π
π
Rs Resistance corrected
Rm Measured resistance
Ts Desired reference temperature
Tm The temperature at which resistance was/is measured
Tk 234.5 for copper
225.0 for aluminum
(aluminum may be as high as 240)
Alternative: Correction with βalpha25β to calculate Tk with the formula:
π
π
=
1
πππβπ25
β 25
When temperature correction is activated, the Main Test Screen appears as below:
The βTβ in the measuring channel box shows that
the displayed resistance value is corrected. In this
example it is corrected to 25 Β°C using Tk of Copper
and referring to Temperature probe 1.
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