Milliohm Meter 16502 User’s Manual
8-2
A165015 temperature probe
8.2 Operation for Temperature Measurement
Temperature measurement function calculates the value of unknown temperature by the
condition of known temperature and resistance values. It is often used to calculate the change
of transformer or motor coil.
The milliohm meter is for measuring tiny resistance value, thus the customer can measure
DCR of transformer or motor coil by temperature measurement function. Because the copper
wire is with temperature coefficient (the type is +3930PPM), its’ resistance value will increase
by temperature increment. By using the feature of resistance value variation to calculate that
of temperature for getting the change of transformer or motor coil.
Ususlly the below formula is used for calculation.
R1 235+T1 R1 is a resistance value as temperature equals to T1.
R2 235+T2 R2 is a resistance value as temperature equals to T2.
Then the inference is by above formula, the below temperature conversion function can be
obtained.
8.2.1 Conversion Function
Conversion formula:
Δtn = rt / r0 *(T + t0)-(T + t)
(Δtn): Temperature variation (°C)
(r0): Initial resistance value
(t0): Initial temperature
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