Vanguard TRM-20_40 User Manual

Page 85

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REV 1 TRM-20 AND TRM-40 USER’S MANUAL

81

3.17 Converting Resistance Measurements

The TRM can convert the resistance reading of the device under test at its present temperature
to the equivalent resistance value at a different temperature. The conversion is accomplished
by the following formula:

Rs = Rm (Ts + Tk) / (Tm + Tk)

Where:
Rs is the resistance at desired temperature
Rm is the measured resistance
Ts is the desired reference temperature
Tm is the temperature at which the resistance was measured
Tk is the constant used for the winding material

Tk = 234.5 for copper

Tk = 240.0 for aluminum

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