Radiated Emissions Testing

Ensuring your product does not exceed test limits (FCC, CISPR, etc) is the manner incorporated in North America to minimize RF interference among electronics.

Testing for radiated emissions is done in a couple formats. Primary, is by using antennas to measure what is emitted directly from the product under test. Secondary, is to measure power and data lines using clamps around the cables to measure emissions emitted down power or data lines.

EMC RADIATED EMISSIONS TESTING

Performing precompliance EMC testing for radiation emissions is common to do throughout the design process. While replicating an EMC test lab is a challenge, most of our customers will setup an RF tent to isolate noise while testing their product. After setting up a directional antenna and connecting to a spectrum analyzer, they are off and rolling. Test standards can provide specifics regarding spacing, insulation, placement , etc... We have found that in most cases, these aren't detrimental pieces to getting reliable emissions measurements. Most EMI software will have the test levels pre-programmed for common radiated emissions test standards.

Ensure to take baseline measurements to ensure you are identifying issues emitted by your product and not an external factor in your lab.

For FCC Part 15, your test frequency range is determined by the fastest clock speed of your product. Beyond 1 GHz, your limit will be the same.

Taking radiated emissions measurements on very large equipment such as industrial machinery or other equipment that is already installed - see In-Situ Testing

Radiated emissions testing on small products can be performed in small benchtop enclosures. See the video section for an example.

• FCC Part 15
• CISPR 11
• CISPR 16
• CISPR 25
• CISPR 32
• MIL-STD-461
• IEC/EN 61000-6-3
• IEC/EN 61000-6-4
• IEC 60945

MORE RESOURCES

• EMC Precompliance Testing
• Radiated Emissions Test Systems & Equipment
• FCC Part 15B Rental Package
• Radiated Emissions GTEM Package
• CISPR 25 Test Setup