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Electrochemical Impedance Spectroscopy (EIS) is one of
the most powerful and popular techniques in the modern electrochemical
laboratory. When evaluating an EIS system to purchase, we trust
the manufacturer to accurately publish the performance specifications
for their system. That may be a mistake.
An accurate EIS measurement depends on the accurate application of an AC
signal and accurate measurement on an AC response. For most
manufacturers, the maximum frequency is specified to be 1 MHz (1
Megahertz). That's one million cycles per second. That's
very fast and it is not easy. Several manufacturers of EIS systems
misrepresent the ability of their instruments to make an accurate EIS
measurement at 1 MHz.
Our Application Note
"Quick Check of EIS System Performance" details a procedure for
checking the maximum frequency of any EIS System using a range of
commonly-available resistors. It's easy to do and you can quickly
determine the true performance of your EIS System at high frequencies.
If you'd like Gamry to send the 100 Ω, 1 kΩ, and 10
kΩ resistors to you to test your EIS System, just drop us an email at
info@gamry.com and we'll ship them
to you at no charge.
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