Hioki IM3533, Instruction Manual

Page: 383 / 400

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
t

C and
t
0

C.
Example
If a copper test object (with resistance temperature coefficient of 3930 ppm) measures 100

at 30

C, its
resistance at 20

C 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
t t
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
t
0
R
1
1

t
0
t t
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.