Functions in the channel menu
35
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© 2010 Thorlabs
2.2.8.2 Exponential method
The dependency between resistance and temperature of an NTC (thermistor) can be
described by the formula:
val
val
T
T
B
B
R
R
T
T
B
R
T
e
R
T
R
val
+
=
⇔
∗
=
−
)
ln(
*
*
)
(
)
(
0
0
0
)
1
1
(
0
0
with: R(T) Thermistor
resistance at a given temperature T
R
0
:
Thermistor nominal resistance at temperature T
0
T
0
:
Nominal temperature (typ. 298.15 K = 25°C)
B
val
: Energy
constant
(temperatures in Kelvin)
For R
0
, T
0
and B
val
, please refer to the data sheet of the thermistor.
To change the three parameters select them one by one and change them to the
desired value.
Refer to the data sheet of the thermistor.
To change the three parameters(R
0
, B, T
0
) select them one by one and change them
to the desired value.
Pressing
will make every setting valid.
2.2.8.3 Steinhart-Hart method
A further way to represent the relation between temperature and thermistor
resistance is the method according to Steinhart-Hart
3
))
(ln(
3
)
ln(
2
1
/
1
R
C
R
C
C
T
∗
+
∗
+
=
with the three parameters C
1
, C
2
and C
3
.
To change the three parameters select them one by one and set them to the desired
value.
Press
to confirm each input.
Содержание ITC8 Series
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