Hioki RM3545, Instruction Manual, Page: 337 / 364

Appendix 10 Detecting the Location of a Short on a Printed Circuit Board
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ppend
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Comparing the resistance values at multiple locations provides a useful way to infer the
location of a short on an unpopulated printed circuit board. Short patterns X and Y as
described below:
Example
(1) 20 m
Ω
(2) 11 m
Ω
(3) 10 m
Ω
(4) 11 m
Ω
Based on the above measured values, the short can be inferred to be near (3).
Appendix 10 Detecting the Location of a Short on
a Printed Circuit Board
1
Connect SOURCE A and SOURCE B to their respective patterns.
2
Connect SENSE A to a point near SOURCE A, and SENSE B to location (1).
3
Observe the measured values as you move SENSE B from (1) to (2), (3), and (4).
Higher resistance values indicate greater distance from the short location. Nar-
row down the short location by moving the SOURCE B and SENSE B terminals.
SENSE B
(1) SENSE B
(2) (3) (4)
SOURCE B
SOURCE A
SENSE A
i
Pattern X
Short
Pattern Y