GOM-804 & GOM-805 User Manual
56
Temperature Conversion
Background
The Temperature Conversion function allows you to
determine the temperature change of a DUT at any given
resistance, if the initial temperature, the inferred zero
resistance temperature for the DUT and the initial
resistance of the DUT are known. The displayed result
can also be the extrapolated to calculate the final
temperature (T) or the extrapolated temperature
difference (
△
T)*.
Temperature Conversion function works on the following
formula:
1
0
2
0
1
2
t
t
t
t
R
R
Where:
R
2
= resistance @ temperature t
2
R
1
= resistance @ temperature t
1
t
0
= inferred zero resistance temperature in
º
C**
t
1
= temperature at R
1
t
2
=temperature at R
2
The temperature conversion function is can be used to
determine the temperature of transformer windings,
electric motors, or other materials where it may not be
practical to embed a temperature sensor.
*(T) Final temperature = t
2
=
△
T +T
A
(T
A
) Ambient temperature = Ambient temperature when
R
2
is measured. T
A
can either by manually measured with
the PT-100 sensor or it can be manually set.
(
△
T) Extrapolated temperature difference = T - T
A
**“Constant” setting on the panel display is equivalent to
the absolute value of the inferred zero resistance
temperature.
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