Hioki RM3545, Instruction Manual, Page: 322 / 364

Appendix 6 Zero Adjustment
A10
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 meth-
ods: 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 SENSE A and SENSE B. However, Table 1 (b) is the connection
using a metal board or similar object, so that 0 V is not obtained between SENSE A and
SENSE B.
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