METREL MI 3250, Instruction Manual

Page: 26 / 37

MI 3250 MicroOhm 10A Main menu
26
Example:
 
C temp amb
C temp ref
Al C ppm
m R
temp amb
 
 
 
 
40 _
25 _
) ( / 4100
44 . 118
_

   
 
 
 
 
 
 
   
   
  
 
 
 
m
C C ppm
C C ppm
m
temp amb
temp ref
R R
temp amb temp ref
18 . 112
) 40 / 4100 ( 1
25 / 4100 1
44 . 118
_ 1
_ 1
_ _


 
 

m R
C
18 . 112
25
Measurement window shows the compensated value.
Figure 4.13: Compensated result example
This table shows the
temperature coefficient of various materials at 20 °C (68 °F)
Material Symbol Temperature coefficient
 
C ppm

/

Resistivity
 
m

Aluminium Al 4100
2,82×10
−8
Copper Cu 3930
1,68×10
−8
Gold Au 3715
2,44×10
−8
Iron Fe 5671
1,0×10
−7
Nickel Ni 5866 6,
99×10
−8
Platinum Pt 3729 1,
06×10
−7
Silver Ag 3819 1,
59×10
−8
Zinc Zn 3847 5,
90×10
−8
Table 4.1: Temperature coefficient and resistivity