Keysight Labs | Radiated and Conducted Emissions Testing - The ABCs of EMC (E02) @KeysightLabs | Uploaded September 2018 | Updated October 2024, 7 hours ago.
Learn what EMC is and why it matters for all electronic devices.
1-Click Subscribe: bit.ly/Labs_Sub
Download "Making Conducted and Radiated Emissions Measurements:" bit.ly/2GvH46D
Watch the previous episode of 'The ABCs of EMC' Series here: youtu.be/1p7kq1UjkQQ
Like our Facebook page: facebook.com/keysightrf
Check out our blog: bit.ly/RFTestBlog
Check out the EEs Talk Tech electrical engineering podcast:
eestalktech.com
Twitter: @DanielBogdanoff twitter.com/DanielBogdanoff
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.
While we mentioned CISPR, or the International Special Committee on Radio Interference, in the last episode, CISPR’s standards only represent the foundation for emissions tests we’ll be discussing in this ‘ABCs of EMC’ series.
CISPR is not representative of all EMC regulatory standards across the world and therefore it is important to be familiar with your local standards.
Classifications for a product range from – automotive, communication and so forth – as seen on the table that is now on screen.
Only once you understand your local compliance standards can you conduct Pre-compliance EMC tests accurately.
For pre-compliance conducted emissions testing you’ll need a EMI reciever or spectrum analyzer with an EMC application, a transient limiter, and a line impedance stabilization network – or LISN.
For pre-compliance radiated emissions testing you’ll need an EMI reciever or spectrum analyzer with an EMC application and a calibrated EMI antenna. Here's what our radiated emissions testing looks like.
You’ll need a large area away from other electronic equipment to avoid electromagnetic interference that can disrupt your testing and lead to inaccurate test results.
Your device most commonly will be placed at a distance of 3 meters away from the antenna which is connected to the EMI reciever or spectrum analyzer outside the chamber.
Stay tuned for the next episode of The ABCs of EMC series where we’ll perform a EMC pre-compliance test on our device.
In the meantime, to learn more about how you can do your own emissions testing, check out the “Making Conducted and Radiated Emissions Tests” application note linked in the description below.
Don’t forget to subscribe to our Keysight Labs channel and follow us on our RF Facebook page.
Thanks for watching, and see you next time!
Learn what EMC is and why it matters for all electronic devices.
1-Click Subscribe: bit.ly/Labs_Sub
Download "Making Conducted and Radiated Emissions Measurements:" bit.ly/2GvH46D
Watch the previous episode of 'The ABCs of EMC' Series here: youtu.be/1p7kq1UjkQQ
Like our Facebook page: facebook.com/keysightrf
Check out our blog: bit.ly/RFTestBlog
Check out the EEs Talk Tech electrical engineering podcast:
eestalktech.com
Twitter: @DanielBogdanoff twitter.com/DanielBogdanoff
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.
While we mentioned CISPR, or the International Special Committee on Radio Interference, in the last episode, CISPR’s standards only represent the foundation for emissions tests we’ll be discussing in this ‘ABCs of EMC’ series.
CISPR is not representative of all EMC regulatory standards across the world and therefore it is important to be familiar with your local standards.
Classifications for a product range from – automotive, communication and so forth – as seen on the table that is now on screen.
Only once you understand your local compliance standards can you conduct Pre-compliance EMC tests accurately.
For pre-compliance conducted emissions testing you’ll need a EMI reciever or spectrum analyzer with an EMC application, a transient limiter, and a line impedance stabilization network – or LISN.
For pre-compliance radiated emissions testing you’ll need an EMI reciever or spectrum analyzer with an EMC application and a calibrated EMI antenna. Here's what our radiated emissions testing looks like.
You’ll need a large area away from other electronic equipment to avoid electromagnetic interference that can disrupt your testing and lead to inaccurate test results.
Your device most commonly will be placed at a distance of 3 meters away from the antenna which is connected to the EMI reciever or spectrum analyzer outside the chamber.
Stay tuned for the next episode of The ABCs of EMC series where we’ll perform a EMC pre-compliance test on our device.
In the meantime, to learn more about how you can do your own emissions testing, check out the “Making Conducted and Radiated Emissions Tests” application note linked in the description below.
Don’t forget to subscribe to our Keysight Labs channel and follow us on our RF Facebook page.
Thanks for watching, and see you next time!
