EMI Countermeasure Services

To address the increasingly stringent domestic and international regulations on electromagnetic interference (EMI), significant investment in large-scale testing facilities and advanced technical expertise is required. However, this poses considerable challenges for small and medium-sized enterprises. While some may rely on the infrastructure of certified testing agencies, the associated costs remain a substantial burden.

To support such needs, TNC Co., Ltd. offers free EMI countermeasure services, focusing on conducted emissions (CE) and radiated emissions (RE). Backed by our high-quality line filters and a team of specialized EMI experts, we provide reliable and comprehensive solutions to help customers achieve full compliance.

Targets of EMI Testing

Currently, countries around the world enforce regulations on electromagnetic interference (EMI), including those established by CISPR, FCC, EN, and VCCI. In particular, FCC and EN standards have become increasingly applicable to various types of electronic equipment. If these standards are not met, exporting such products to those respective countries may be impossible.

Purposes of Electromagnetic Regulation

Electromagnetic Compatibility (EMC) Testing

It refers to a device’s ability not to cause electromagnetic interference (EMI) to surrounding equipment or environments, and at the same time, to operate reliably in the presence of external electromagnetic influences.
In other words, the device complies with emission standards that prevent its electromagnetic emissions from affecting other devices, and with immunity standards that ensure it remains functional when exposed to EMI from external sources—thereby meeting the electromagnetic protection criteria.

Electromagnetic Compatibility (EMC)

Electromagnetic compatibility (EMC) testing refers to two types of emission tests and six types of immunity tests.

EMI countermeasure methods

To reduce electromagnetic interference (EMI), there are four main methods

Grounding

The purpose is to direct leakage current from the device to the ground in order to protect both equipment and human safety, while also minimizing electromagnetic interference (EMI) caused by electromagnetic coupling of disruptive signals.

Filtering

To minimize the noise flowing through a line, it is filtered according to the required frequency range.

Wiring

To minimize noise along its transmission path (the line), the conductor should be made thicker and shorter to reduce impedance, and the noise source should be physically separated from susceptible components to limit electromagnetic coupling.

Shielding

To minimize noise intrusion from the surrounding space, the device is enclosed in metal or conductive materials. This technique effectively blocks electromagnetic waves from entering, reducing the impact of radiated noise.

List of Equipment Owned by Our Company