TrueData-EIS Controller for measuring the electrochemical Impedance Spectroscopy

TrueData-EIS Impedance Spectroscopy Analyzer

TrueData-EIS electrochemical impedance spectrometer is a high-capacity diagnostic tool to determine the impedance of fuel cells, membranes, MEAs, single cells, stacks, batteries and super capacitors. It uses a non-invasive method and allows the characterization of components during operation under different load conditions. The test item is stimulated with a small sinusoidal signal. The resulting signal response is measured with magnitude of impedance and phase over a larger frequency range.

The TrueData-EIS impedance spectroscopy analyzer is based on the single-sine-method and enables, together with the used 32 bit processor technology, high precision and an easy integration in automated test systems for fuel cells and batteries. Typically, the TrueData-EIS is applied together with the electronic load TrueData-LOAD. In addition, the TrueData-EIS is compatible with various other electronic loads, potentiostats and galvanostats.

The FuelCon TrueData-EIS allows impedance spectrums in a frequency range, which is particularyly interesting for the fuel cell development and manufactoring: from 200 µHz up to 100 kHz with a maximum DC current of 1,000 A. The complex circuitry design and sophisticated calibration performance ensure high reproducibility of measured data within the typically very low impedance values of fuel cells. A display with four keys allows a comfortable operation of the device.

Its optimum performance is achieved when using the TrueData-EIS combined with the FuelCon Evaluator test station and the software TestWork. While measuring, the test results are displayed as a frequency response diagram or Nyquist diagram.  At the same time, the parameters of fuel cell operation are specified on-line. This allows the fully automated recording of the impedance spectrum under different, reproducibly adjusted operating points for single cells, short stacks and complete cell stacks.  Therefore it is ideal for material screening.

The optional Multiplex-Module TrueData-MUX enables the easy and cost-optimized realization of multi-channel measurement. The TrueData-MUX is available with 12, 24 and 36 channels.

Data of TrueData-EIS

Impedance range5 µΩ to 15 Ω

Frequency range

200 µHz to 10 kHz,
200 µHz to 50 kHz,
200 µHz to 100 kHz

Frequency accuracy

± 1 %

AC current amplitude

up to 2.5 A

AC current accuracy

± 1 %

DC voltage maximum

10 V, 35 V, 70 V, 100 V

DC current maximum

100 A, 250 A, 500 A, 1,000 A

Load mode

Current (Galvanostat), Voltage (Potentiostat), Power, Resistance

Phase angle accuracy

± 1 °

Impedance accuracy

± 1 %

Online-Nyquist plot


Frequency Sweep


DC drift compensation



Ethernet, RS232

Color TFT-Display


Power supply

110 - 230 V AC, 100 W


19” housing, 3 HE

Dimensions (WxHxD)

485 mm x 135 mm x 440 mm (19” x 5.3” x 17.3”)


13.2 kg



 10 kHz50 kHz100 kHz
100 A EIS 100 A/ 10 V/50 kHz (23001200)
EIS 100 A/ 35 V/50 kHz (23001203)
EIS 100 A/ 70 V/50 kHz (23001205)
EIS 100 A/100 V/50 kHz (23001207)
EIS 100 A/10 V/100 kHz (23001300)
EIS 100 A/35 V/100 kHz (23001303)
250 A EIS 250 A/ 10 V/50 kHz (23001210)
EIS 250 A/ 35 V/50 kHz (23001213)
EIS 250 A/ 70 V/50 kHz (23001215)
EIS 250 A/100 V/50 kHz (23001217)
500 AEIS 500 A/ 10 V/10 kHz (23001130)
EIS 500 A/ 35 V/10 kHz (23001133)
EIS 500 A/ 70 V/10 kHz (23001135)
EIS 500 A/100 V/10 kHz (23001137)
EIS 500 A/ 10 V/50 kHz (23001230)
EIS 500 A/ 35 V/50 kHz (23001233)
EIS 500 A/ 70 V/50 kHz (23001235)
EIS 500 A/100 V/50 kHz (23001237)
1,000AEIS 1,000 A/ 10 V/10 kHz (23001150)
EIS 1,000 A/ 35 V/10 kHz (23001153)
EIS 1,000 A/ 70 V/10 kHz (23001155)
EIS 1,000 A/100 V/10 kHz (23001157)

TrueData-EIS Display Views

The device will be operated with 4 keys and a graphical display. The measured impedance values are presented in a table as shown.

TrueData-EIS display view

At the top of the display a state line shows the progress and the actual state of the impedance measurement.

TrueData EIS menu. Status line summarizes progress and current status of the impedance measurement.

The working points with the DC-values are presented in a separate display. The actual DC mode (current [galvanostat], voltage [potentiostat], power) is shown with the grey set point value to the left part of the display.

TrueData-EIS display. The results of the frequency sweep (impedance spectrum) is presented as Nyuist diagram or frequency response plot.

The results of the frequency sweep (impedance spectrum) is presented as Nyuist diagram or frequency response plot.

The results of frequency sweep (impedance spectrum) is presented as Nyuist diagram or frequency response plot.

The configuration of the device is supported by a clear tree structure of the parameters.

TrueData-MUX Impedance Multiplexer

The TrueData-MUX multiplexer, togehter with TrueData-EIS, allows the multi channel measurement of impedances. Typical applications are measurements of the impedances of the single cells inside a fuel cell stack or the impedances of the elements of a battery.

TrueData-MUX is available in three groups of 12 channels per group for either  12, 24 or 36 channel configurations. Each group has its own connector and LEDs for state information.

For further detailed information please read our technical data sheet, that is available in our download area.

Or just give us a call! We will be happy to discuss your requirements.