A9
Zero Adjustment
Constant-current power supply
Voltmeter
SOURCE-H
SENSE-H SENSE-L
SOURCE-L
E
I
0
R
SEH
R
SOH
R
SOL
R
SEL
R
Short
I
E
=(
I
0
×
R
SEL
)+(
I
0
×
R
SEH
)
=(0×
R
SEL
)+(0×
R
SEH
)
=0 [V]
Figure. Conditions where a pseudo 0
Ω
is connected
To properly carry out the zero adjustment:
“Table. Connection Method” illustrates the correct connection method and the incorrect connection method.
The resistances in the gure show the wiring resistances, and these are ignored if they are less than several
Ω
respectively.
As shown in (a), when connecting respectively SENSE-H and SENSE-L, and SOURCE-H and SOURCE-L,
and then connecting the SENSE and the SOURCE with one path, there is no voltage potential difference
produced between SENSE-H and SENSE-L, and thus, a voltage of 0 V is applied. This connection method
performs the correct zero adjustment.
However, as illustrated (b), when connecting respectively SENSE-H and SOURCE-H, and SENSE-L and
SOURCE-L, and then connecting the Hi-side and the Lo-side with one path, there is a voltage potential
difference of
I
×
R
Short
between SENSE-H and SENSE-L. Thus, the connection method does not create
conditions where a pseudo resistance of 0
Ω
is connected, and thus, does not perform the correct zero
adjustment.
10
9
8
7
6
5
4
3
2
1
Appx. Ind.
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