Appendix 8 Zero Adjustment
A13
Appendix
To perform zero adjustment using 9454 ZERO ADJUSTMENT BOARD
When performing zero adjustment, you cannot use a metal board or similar
object to replace 9454 ZERO ADJUSTMENT BOARD.
9454 ZERO ADJUSTMENT BOARD is not just a metal board. Its structure con-
sists of two layers of metal boards screwed at one point. The zero adjustment
board is used when performing zero adjustment of 9465 PIN TYPE LEAD.
Table 3 shows cross sectional diagrams and equivalent circuits of the two con-
nection methods: connecting PIN TYPE LEAD to zero adjustment board, and
connecting that to a metal board or similar object. Table 1 (a) indicates the con-
nection using zero adjustment board, resulting in 0 V between SENSE-H and
SENSE-L. However, Table 1 (b) is the connection using a metal board or similar
object, so that 0 V is not obtained between SENSE-H SENSE-L.
Table 3: Pin type lead connection methods in zero adjustment
Connection method
If connection is made using
9454 ZERO ADJUSTMENT BOARD
If connection is made using
metal board or similar object
Tip of lead
Equivalent circuit
Deformed equiva-
lent circuit
As connection meth-
od for zero adjust-
ment
Correct Wrong
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