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User’s Manual
BIM1000 Series
Appendix
Four-Terminal Measurement Method
This product uses a four-terminal measurement method to eliminate unnecessary resistance and measure
the actual internal resistance of batteries. At the same time, it also measures DC voltage.
The following figure shows the inner measurement structure of the product.
Because hardly any current flows through the test leads connected to the SENSE connector, r2 and r3 can
be ignored. The resistances r1 and r4 of the test leads connected to the SOURCE connector does not
affect the voltage measurement of the DUT, so they can be ignored. This makes it possible to ignore the
test lead resistances and measure the voltage across the DUT, which allows the internal resistance to be
measured accurately.
DUT
DC voltmeter
Constant AC
current source
AC signal
sampling
SOURCE
LOW
SENSE
LOW
SENSE
HIGH
SOURCE
HIGH
BIM1000 Series
r1
r2
r3
r4
Summary of Contents for BIM1000 Series
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