A-2
12704A Resistivity Chamber Operation Manual
A.1
How to Calculate Volume and Surface Resistivities
A.1 How to Calculate Volume and Surface Resistivities
Formulas to calculate volume and surface resistivities are described below:
Volume resistivity:
Rv
t
4
d
v
2
-------
(1)
Surface resistivity:
Rs
d
D
)
d
D
(
s
-------
(2)
The electrode diameters of the 12704A are as follows:
Figure A-1 Electrode Diameter
The following formulas are obtained by substituting these values for formulas (1) and (2).
Volume resistivity:
t
Rv
63
.
19
v
[
cm]
------- (3)
Surface resistivity:
Rs
84
.
18
s
[
]
-------
(4)
By substituting measured values for formulas (3) to (4), the volume resistivity and the surface
resistivity can be obtained.
v : volume resistivity [
cm]
s : surface resistivity [
]
Rv : volume resistance [
]
Rs : surface resistance [
]
: circumference ratio=3.14
t
: sample thickness [cm]
D : guard electrode inner diameter [cm]
d
: main electrode diameter [cm]
Main electrode
Guard electrode
Sample
Opposed electrode
Main electrode diameter: 50 mm
Guard electrode inner diameter: 70 mm
Guard electrode outer diameter: 80 mm
Opposed electrode outer diameter: 83 mm
JIS-K6911 - compliant
Summary of Contents for 12704A
Page 2: ......
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Page 5: ...1 1 12704A Resistivity Chamber Operation Manual 1 Introduction Chapter 1 Introduction ...
Page 14: ......
Page 23: ...4 1 12704A Resistivity Chamber Operation Manual 4 Specifications Chapter 4 Specifications ...
Page 25: ...A 1 12704A Resistivity Chamber Operation Manual APPENDIX APPENDIX ...