Radiated and Conducted Emissions Testing - The ABCs of EMC (E02)

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Transcript: You already know that EMC testing is important to do, but where do you even begin?

Hi everyone – my name is Matt and I’m an engineer here at Keysight and welcome to the ‘The ABCs of EMC’. Emissions testing refers to the amount of electromagnetic energy your device is emitting. Its important to ensure your device does not unintentionally interfere with neighboring devices. There are several compliance tests that your device will need to pass at a certified test facility before it can be brought to market. These EMC tests range from radiated and conducted emissions to power line surge and electrostatic discharge immunity. Today we’ll discuss 2 tests that are often failed by devices – conducted and radiated emissions.

In the last episode we defined EMC, or electromagnetic compatibility, and also talked about how important it is to be familiar with your local compliance standards. If you haven’t checked it out already, I highly suggest doing so before watching this episode by clicking on the card above or the link in the description below.

Radiated emissions tests characterize unintentional electromagnetic energy released over the air. Basically, a radiated emissions test searches for signals broadcast by the DUT through the air. Since radiated emissions are one of the most frequently failed tests, it’s imperative that you spend time measuring your device’s radiated emissions.

Conducted emissions tests, on the other hand, characterize unintentional electromagnetic energy released via conductive material like cables. So, with this kind of test, you’re testing for electromagnetic disturbances that are conducted outside the device along its interconnecting cables –like power, signal, or data cables. Conducted emissions tests focus on the unwanted signals generated through to the AC mains connection of a device. These emissions sources can include, but are not limited to, switches, regulators and low frequency clocks.

In order to know what standards you're testing against you need to know your product's classification and where it will be sold.

Before doing any sort of EMC testing it is very important that you’re familiar with your local compliance standards.

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