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36
Se
c
tion 3
BASI
C
OPE
RATION
ZJ-SD
User’s Manual
Section 3
Correcting the Measurement Reference Voltage
Correcting the Measurement Reference
Voltage
More accurate measurement results can be obtained by correcting the potential used as a
reference in taking measurements (i.e., resetting zero).
As shown below, zero is reset by using a recommended reference detection object that is
grounded.
• Accurate measurements may not be possible if the object being used as the reference detection
body carries a static charge because there is a charged object nearby or because the plate is not
grounded properly.
• The same measurement results can be obtained with a jig or other object as long as the
conditions given for the reference detection object are met.
■
Linearity (Reference Values)
The linearity shown in the following graph can be obtained by resetting zero as
described above.
A
B
Material: Conductive metal plate
Dimension A
≥
5L
1
Dimension B
≥
5L
1
Thickness (t)
≥
1 mm
Conditions for Recommended Reference Detection Object
Reference detection object
L
1
A and B must be at
least 5 times the
installation distance L
1
Linearity
−
5.0
−
4.0
−
3.0
−
2.0
−
1.0
0.0
1.0
2.0
3.0
4.0
5.0
−
6 kV
−
4 kV
−
2 kV
0 kV
2 kV
4 kV
6 kV
Set voltage [kV]
[%FS]
Note: The graph shows measurement data with n = 8.
operation2.book Page 36 Wednesday, November 29, 2006 2:56 PM