Hioki BT3554-51 - Page 172

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E󰀨ects of Current Density
To avoid these e󰀨ects, detect voltage across the two points located
the inside of the two current injecting points using a four-terminal
test lead such as the Hioki 9453 Four Terminal Lead. The current
distribution is generally considered to become stable at a distance
equivalent to the width or thickness or more inwardly away from the
current injecting points.
Inject
current
Inject
current
Figure 1: Equipotential lines on a metal plate, showing the current
distribution at 50 µV intervals when a current of 1 A is injected
from the distal points of the plate (W300 × L370 × t0.4)
As shown in Figure 2, it is preferable to place the SENSE terminals
at the points a distance equivalent to the width or thickness inwardly
away from the SOURCE terminals are placed.
SOURCESOURCE SENSE SENSE
Greater or equal to W or t
Greater or equal to W or t
W
t
Figure 2: Contact locations when the object under measurement is wide
or thick
HIOKI BT3554F961-00HIOKI BT3554F961-00