User Manual
108
t
1
– DUT temperature at the start of the thermal test.
t
a
– Ambient temperature at the end of the thermal test.
k
– Variance ration of the temperature coefficient when the conductor is at 0 °C.
Example:
A copper DUT is measure before operation:
R
1
is 100 mΩ,
t
1
is 20 °C. A second measurement is taken
after operation and power is removed:
R
2
is 105 mΩ,
t
a
is 25 °C.
k
is 234.5.
The temperature change is calculated:
The DUT’s temperature (
can be estimated be adding the ambient and change in temperature.
The
k
constant can be calculated for a material with a temperature coefficient α
t0
at a given
temperature t
0
with the following formula.
The copper k constant can be calculated where α
t0
= 3930ppm at
t
0
= 20 °C.
4.2.6 Analog Input
Tap the T.SENS soft key to select the temperature input type. AnLG_In is analog input and the
corresponding formal is: