Hioki RM3542 - Appendix 9 Zero Adjustment (cont.); To perform zero adjustment using 9454 Zero Adjustment Board

Appendix 9 Zero Adjustment
A19
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 consists 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 connection
methods: connecting Pin Type Lead to zero adjustment board, and connecting that to
a metal board or similar object. Table 1 (a) indicates the connection using zero
adjustment board, resulting in 0 V between H
POT
and L
POT
. However, Table 1 (b) is
the connection using a metal board or similar object, so that 0 V is not obtained
between H
POT
and L
POT
.
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 equivalent
circuit
As connection
method for zero
adjustment
Correct Wrong