Conducted Emissions Testing

What is RF emission testing?

Conducted RF emissions are electromagnetic currents generated by electrical devices. Testing the emissions of a device helps engineers understand the level of energy and strain a device puts on the electrical supply and grid.

Testing Partners aims to minimize the amount of interference that a device can feedback to the power supply. Our laboratories calculate these emissions at ranges between 150 kHz and 30 MHz to ensure they are below defined limits.

The process ensures that the local electricity source is reasonably clean and that the system has little to no effect on surrounding devices and equipment.

What is LISN?

A LISN is a low-pass filter that is established between an alternating and direct current power source for the device that is being tested. It has a specific impedance and RF noise measuring port that connects to a measuring receiver or spectrum analyzer.

Maximized emissions testing

For each device that we test we will determine its maximization. This process will help us determine the highest amplitude of the product’s emissions. Once we’ve identified the highest emission frequencies, we’ll run a maximization process in a specialized 10m EMC chamber.

The frequency range 150 kHz to 30 MHz is used for most conducted emissions standards. However, in rare instances, this range could change.

While different devices may have specifications that require different frequency ranges and impedances, LISN suppliers usually have products that meet these criteria.