Appendix
Appendix9 Temperature Correction Function (TC)
A13
Temperature correction employs the temperature coefficient of a material to convert its resistance measured
at one temperature to the value it would have at any other temperature, for display. Because resistance is fun-
damentally temperature-dependent, measuring it without considering the temperature can provide meaning-
less results.
Resistances
R
t
and R
t0
below are the resistance values of the test object (having resistance temperature
coefficient at
t
0
C of
t0
) at tC and t
0
C.
Example
If a copper test object (with resistance temperature coefficient of 3930 ppm) measures 100 at 30C, its
resistance at 20C is calculated as follows:
For more information about how to configure the temperature correction function, see below:
See "4.3.1 Configuring the Temperature Correction Function" (p. 81)
Appendix9 Temperature Correction Function
(TC)
R
t
R
t
0
1
+
t
0
tt
0
–=
R
t
: Actual measured resistance []
R
t0
: Corrected resistance []
t
0
: Reference temperature [C]
t : Ambient temperature [C]
t0
: Temperature coefficient at t
0
[1/C]
100
1 3930 10
6–
30 20–+
-------------------------------------------------------------------------=
96.22=
R
t0
R
1
1
t0
tt
0
–+
-----------------------------------------=
• The temperature probe detects only ambient temperature; not surface temperature.
• Before measuring, allow the instrument and temperature probe to warm up com-
pletely, place the temperature probe as close to the test object as possible, and allow
sufficient time for them to stabilize at ambient temperature.
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