In today's rapidly expanding and increasingly intricate power grid, the importance of conducted emissions testing cannot be overstated. Fortunately, the setup for this testing process is relatively straightforward and provides valuable insight into the device's electromagnetic compatibility (EMC). Conducted emissions refers to signals transmitted through cables, gauging the device's emissions via its power supply to other devices connected to the grid.
The device under test, or DUT, is placed on a non-conductive table. In order to assess its emissions, it is connected to a line impedance stabilization network (LISN)
. This device establishes a known impedance, overruling normal power fluctuations and the impedance variations inherent in different outlets. By standardizing the power source, the LISN allows technicians to identify that any abnormalities in the electricity are caused by the DUT. An EMI receiver
or spectrum analyzer
then displays graphical results that can be compared to limit lines based on certain test standards.
Advanced Test Equipment prides itself on providing a comprehensive range of testing components essential for achieving either pre-compliance or full compliance with industry standards such as CISPR, IEC, or MIL. Our rental service provides both the necessary tools and the solutions to conduct thorough testing and address EMC-related concerns before they become problems.
Conducted Emissions Standards
The most common standard is IEC CISPR. Click each link to learn more about the specific standard.
- CISPR 11 (Industrial, scientific, and medical equipment; also called ISM)
- CISPR 14-1 (Household appliances, electric tools, and similar)
- CISPR 15 (Lighting equipment)
- CISPR 25 (Automotive)
- CISPR 32 (Multimedia)
Another widely used standard is the military & aerospace standard, called MIL-STD-461G
. Like CISPR, it includes several components.
A different aspect of conducted emissions is harmonics and flicker testing, regulated by the IEC. Flicker is one of the oldest EMC tests, and a harmonics and flicker analyzer
ensures each device connecting to the power grid won't cause a large interrupt in the existing power supply and improves overall efficiency.
Types of Conducted Emissions Test Equipment
- Comb generator
- EMI receiver
- Harmonics & flicker analyzer
- Spectrum analyzer
- RF current probe
- Transient limiter