Improving diagnostic measurements during operation of electrolyzers

An electrochemical system comprising:

• a cell designed to produce an output based on an internal chemical reaction upon supplying of a direct current (DC) power;
• a DC power source to supply said DC power to said cell to cause production of said output by said cell;
• a test source to apply an alternating current (AC) signal across said cell to perform measurement of a diagnostic parameter of said cell;
• and
• a filter located in a path between said DC power source and said cell, said filter designed to block said AC signal when said AC signal is applied across said cell,
• whereby said test source is operable to perform said measurement during said production of said output while said filter prevents the diversion of said AC signal to said DC source.

A non-transitory machine-readable medium storing one or more sequences of instructions for performing diagnostic measurements in an electrochemical system, wherein execution of said one or more instructions by one or more processors contained in a control system associated with said electrochemical system causes said control system to perform the actions of:

• controlling a DC power source to supply DC power to a cell in said electrochemical system to cause said cell to produce an output based on an internal chemical reaction;
• concurrently injecting an AC signal across said cell;
• and
• measuring, based on a response to said AC signal, a diagnostic parameter of said cell.