BRS BIM1 User Manual

Battery Impedance Meters
BRS Messtechnik GmbH
Page 12 of 36
Version 1.7 / April2015
4 Measurement Functions
4.1 Functional principle of the impedance measurement
The measurement device loads the battery with
an alternating current (I
AC
) which is considerably
smaller than the load current, and measures the re-
sulting voltage (U
AC
), which is in the mV range.
The measurement of alternating voltage is carried
out selectively and synchronously, with the results
by real part and imaginary part. Dividing the alternat-
ing voltage by the alternating current yields the complex impedance Z
AC
. The real
part represents the ohmic components, the imaginary part represents the capacita-
tive (or inductive) components. A negative imaginary part means capacity, a positive
part means inductance.
4.2 Overview
The device is operated using a graphical user interface (GUI). Settings can be ad-
justed and the results shown using this interface.
All setting and results can also be remote controlled using a proprietary communica-
tion protocol.
4.3 Settings
a) Measurement range
The measurement ranges depend on the instrument version:
1mΩ
3mΩ
10mΩ
30mΩ
100mΩ
300mΩ
1Ω
3Ω
10Ω
30Ω
100Ω
300Ω
BIM1
BIM2
BTC1
BIM300
3
AC current
(mA
ss
)
2000
1000
200
100
20
10
5
2
1
0,2
0,1
0,05
DC current
(mA)
1000
500
100
50
10
5
2,5
1
0,5
0,1
0,05
0,025
If the expected impedance is known, then the closest range can be set. If not, it is
best to start at the highest level (1Ω) and reduce it as necessary.
3
The 300Ω range can be used up to 500Ω.
U
AC
I
AC

BRS BIM1 Specifications

General

Brand	BRS
Model	BIM1
Category	Measuring Instruments
Language	English