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The maximum frequency is an important specification for an instrument used to perform
Electrochemical Impedance Spectroscopy (EIS). The majority of EIS manufacturers specify a
maximum frequency of 1 MHz. Some manufacturer's specifications, however, misrepresent
true system performance. Many EIS instruments specified to measure impedance at 1 MHz
can apply a 1 MHz signal and measure a response -- but have huge errors when they do so.
This document is a protocol to quickly assess the performance of any EIS instrument. You can
use it as an easy and effective comparison between systems. You should test before you buy!

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