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Bryan Yarborough

Components and Methods for Current Measurement

Bryan Yarborough
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Victor Lorenzo
Victor Lorenzo
2/7/2016 9:32:52 AM
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The extremes
Thanks for the nice post, Bryan.

Two more important parameters to take into account in current measurement are dynamic range and bandwidth. They, when combined, limit the number of sensors and sensing methods available for one specific application.

Two of my current applications go from one extreme to the opposite: measure pA/nA currents with multi-MHz bandwidth and measure lightning impact impulse currents in the range from 100A up to 200kA and bandwidth from near-DC to below 10MHz.

A "simple" 5mOhm shunt resistor capable of measuring 10/350us current impulses of 100kA peak current weights more than 5kg and has a special construct, both the electric and magnetic fields generated by the current impulse must also be taken into account. These resitors have a very careful shield design.

The final installation location for the current measuring setup also puts constraints, e.g. you can install a 15kg 200kA shunt resistor in a communications tower or building basement, but don't try it in a wind turbine blade.

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alexvidal
alexvidal
2/4/2016 2:10:08 PM
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Re: Similar Themes
Nice coverage. It helps me. Thanks

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antedeluvian
antedeluvian
2/4/2016 9:06:47 AM
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Similar Themes
Bryan

Nice coverage. I took a slightly different slant in several blogs. In case someone is trying to gather more information on the topic, here they are:

Current Measurement Part 1 and Part 2.

RMS Measurement

and I discussed transistor measurement in Using MCUs: Intelligent Digital Power Outputs.

 

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