RF testing is an essential part of the manufacturing process for wireless devices to ensure they meet safety standards and protect users from excessive exposure to RF energy. Usually, this is done with SAR testing, but as devices operating at higher frequencies are developed, compliance testing needs to change to accommodate this new technology. Power Density testing meets this need by evaluating the amount of RF power radiated over a surface area. This testing is critical for ensuring that high frequency devices comply with regulatory safety limits. 

Keep reading to learn more about the differences between these two types of testing and when each is needed for compliance.

What is SAR Testing?

SAR testing measures how much RF energy is absorbed when a wireless device is in use within 20 cm of the body. This testing is required for devices that operate below 6 GHz, because lower frequencies are more likely to be absorbed by human tissue. SAR testing ensures that the amount of energy absorbed stays within the limits set by regulatory bodies, reducing the risk of harmful exposure to RF energy.

SAR testing generally applies to devices including mobile phones, tablets, laptops, wearables, medical equipment, and more.

What is Power Density Testing?

It’s important to specify that SAR testing applies to devices that operate at frequencies of 6 GHz or below, because higher frequency devices require Power Density testing. 

Power Density testing measures how much RF energy is radiated over a specific area when a wireless device is in use. This testing determines how intense the energy of a wireless device is in order to avoid localized heating on the body. Although it is also performed on wireless devices, the technique differs slightly from SAR testing.

Additionally, while SAR testing applies to devices that are used in close proximity to or worn on the body, Power Density testing focuses on devices with different usage patterns, such as mounted or at a distance.

Emerging technologies like millimeter wave, 5G and newer cellular equipment, ultra wide bands, and other high-frequency technologies require Power Density testing to prove compliance with regulatory standards.

When Do You Need Each Test? RF Exposure Lab is Here to Help

RF Exposure Lab can help you determine whether SAR or Power Density testing is necessary for your products based on their operating frequency and other indicators. Our lab has Power Density testing equipment available to ensure that we can always meet our clients’ needs. 

Our expert team knows that the wireless device testing landscape is constantly changing, which is why we do the work of staying on top of it so our clients don’t have to. Through our unique expertise and commitment to our clients, we guarantee accurate testing and results.

We offer testing services for a variety of wireless devices including wireless modems, laptops, tablets, cell phones, medical products, and much more. If you’re looking for wireless device testing help provided with speed, accuracy, expertise, and integrity, contact us to get a quote or learn more about our services.