Hioki RM3542-50, Instruction Manual

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Appendix 9 Zero Adjustment
A
19
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 metal
boards screwed together 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 meth-
ods: connecting Pin Type Lead to zero adjustment board, and connecting that to a metal
board or similar object. When using the zero adjustment board, connection will be as shown
in Table 1 (a), resulting in 0 V between H
POT
and L
POT
. However, Table 1 (b) shows the con-
nection using a metal board etc., and 0 V is not obtained between H
POT
and L
POT
.
Table 3: Pin type lead connection methods in zero adjustment
Connection Methods
If the connection is made using a
9454 Zero Adjustment Board
If the connection is made
using a metal board etc
Tip of lead
Equivalent circuit
Deformed equivalent
circuit
As connection
method for zero
adjustment
Correct Wrong