The BA8100 is designed to test batteries using a sophisticated alternating current measurement technique known as electrochemical impedance spectroscopy (EIS). Through this technique, the BA8100 extracts the internal impedance of a battery over a wide frequency range. The resulting data are used to display a graphical representation of the electrochemical processes occurring in the battery.

The BA8100 applies a small amplitude AC signal to the battery under test and compares it to the corresponding AC voltage signal. The applied alternating current signal is called the disturbance signal and in the BA8100 this signal is superimposed on a DC signal originating from the battery. EIS experiments involving both a constant and an alternating signal are considered dynamic EIS (DEIS). This is in contrast to steady-state EIS (SEIS), which is usually just called EIS and does not include the DC aspect. DEIS provides the advantages of capturing transient impedances and reducing overall test time compared to SEIS.

Using the included frequency response analysis software, the BA8100 can perform EIS tests with a frequency range of 50 mHz to 10 kHz. The impedance spectrum can be evaluated using the Nyquist and Bode plot tools to determine the effective series resistance (ESR) and track battery health. The included self-diagnostic gadget is used to check the operation of the instrument or to compensate for the resistance introduced by the test leads.

Fixed frequency measurements from the front panel
Variable frequency using included software
Maximum input voltage 80 V
Programmable DC and AC settings
EIS frequency range from 50 mHz to 10 kHz
Measurements of impedance Z, phase angle θ, voltage and current
A simple four-wire test connection
Standard LAN, USB (COM) and RS232 interfaces

A self-test fixture (model TLC81) is available to check the performance of the BA8100 and to compensate for the resistance of the test lead.

B&K Precision Corp., 22820 Savi Ranch Pkwy, Yorba Linda, CA 92887, (714) 921-9095,

Tester evaluates internal battery electrochemical and electrical properties

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