N2100 Series Fuel Cell Impedance Meter
N2100 series impedance meter is specially developed by NGI for fuel cell testing. According to different output capacities of the fuel cell stack, N2100 can test the DUT with maximum current 1000A or maximum power 500kW, matching with NGI N62400 series electronic load or N6900 series electronic load. It can display the AC impedance distribution state of fuel cell stack at each frequency point. The frequency range is from 10mHz to 20kHz. Equipped with PC application software, it can display I-V characteristic graph and Cole-Cole plot. The test results can be exported in the formats of EXCEL and JPG.
■ Voltage range: 40V/120V/600V/1000V
■ Matching with N62400 series or N6900 series DC electronic loads
■ Current interrupt method test
■ AC current measurement range: DC current 0.1%~10%, maximum 60A AC
■ The test value can be changed by changing the DC load current value while keeping the customized percentage of AC current unchanged.
■ Multiple protection: OCP, OVP, OPP, OTP
■ Intelligent fan control
■ Communication interfaces: RS485/LAN
I-V characteristic test
By controlling the load current variation, the voltage variation is observed. With the current as horizontal axis and the voltage as vertical axis, the I-V characteristic graph can be displayed on the application software.
CC characteristic test
Constant current test is an important indicator of fuel cell durability test. By setting a fixed load current value to test the voltage variation of a single cell or stack, users can observe the response speed of cell or stack voltage variation, when the load current changes.
The electrodes, electrolytes, diaphragms and other components of the fuel cell stack are equivalent to electrical equivalent circuit. By using AC impedance method or current interrupt method, various data of each component of the equivalent circuit can be analyzed according to the test results.
AC impedance method is to measure the ac impedance of the fuel cell electrode by controlling the ac voltage of the fuel cell electrode and then calculate the electrochemical parameters of the electrode. When the fuel cell outputs direct current, a small sinusoidal signal is superimposed on this basis. By measuring the frequency of dynamic sinusoidal signal, a series of impedance data varying with frequency can be measured. Based on the impedance Z and φ values, the software can automatically calculate and display the complex impedance curve varying with temperature, time, bias, frequency, and can also obtain Cole-Cole plot.
Current interrupt method is to suddenly disconnect the external circuit of the MFC with stable discharge, and measure the voltage varying with time between the anode and the cathode through a high-frequency sampler to obtain the instantaneous voltage ΔU during current interruption. The current is I before the circuit is disconnected. Therefore, the ohmic resistance R =ΔU/I.
Users can perform I-V characteristic test, CC characteristic test, AC open circuit test, AC impedance sweep test on the application software, and can obtain I-V characteristic graph and Cole-Cole plot. Office-like interface, independent display of each channel, supporting voltage and current waveform generation, and result display in tabular form make this professional software multifunctional and easy-to-use.
N62400 Series Low Voltage High Current DC Electronic Load
Low voltage & high current, LCD screen, auto test, fuel cell test, LAN/CAN/RS232