CNS 15936 Multimedia Equipment EMC Testing

CNS 15936 is Taiwan’s national EMC standard for multimedia equipment. It applies to audio and video products, information technology devices with multimedia functionality, and connected equipment that processes or outputs multimedia signals. While the standard is technically aligned with international frameworks such as CISPR 32, it remains a distinct regulatory requirement for products placed on the Taiwanese market.

Key features of the standard include:

• Testing frequency range: Typically from 150 kHz
  to 30 MHz or higher
• Product categories: Includes televisions, monitors, set-top boxes, audio systems, and other high-frequency electronic devices
• Test distance requirements: Specified test environments, often at 3m or 10m
• Emission limits: Clearly defined noise radiation thresholds to ensure safe operation and minimal interference

In addition, even when a product has passed EMC testing under EN 55032 or FCC Part 15B, Taiwan still requires an accredited laboratory to evaluate the product to CNS 15936. International alignment can support design decisions, but local compliance must be demonstrated through Taiwan-accepted testing and reporting.

CNS 15936 EMC Testing Overview

Compliance with CNS 15936 requires specific emission tests, thorough documentation, and procedural controls. Understanding these early helps manufacturers plan development and certification timelines effectively.

EMC Emission Scope

CNS 15936 assesses electromagnetic emissions from power connections and the product enclosure. Test labs measure conducted emissions on power and signal lines (150 kHz–30 MHz), while they measure radiated emissions as fields emitted into free space.

Test Environment & Distance

Testing occurs in shielded chambers or approved sites, following strict criteria for antenna height, polarization, and placement. Even minor setup deviations can invalidate results.

Documentation & Reporting

Compliant reports detail emission levels, methods, setup diagrams, equipment lists, calibration records, and environmental factors. Any deviations must be documented and justified.

Product Classes & Limits

Class A and B limits apply based on product use. Class B, for consumer environments, is more stringent. Proper classification before testing prevents retesting and redesigns.

Design Considerations

EMC compliance starts with good design, grounding, shielding, filtering, and PCB layout are essential for meeting emission limits and supporting product reliability and regulatory approval.

Industries and Devices Covered

CNS 15936 and related BSMI EMC regulations apply primarily to:

Product Categories:

• Televisions, monitors, projectors
• Audio amplifiers, home theater systems
• Set-top boxes, gaming consoles
• Multimedia laptops, desktop PCs
• Broadcast and studio equipment

Industries Affected:

• Consumer Electronics
• Broadcast & Media Production
• IT & Networking
• Medical Equipment (if multimedia features included)
• Industrial Automation

Any electronic product intended for the Taiwan market must comply with these EMC standards to receive BSMI certification.

Expert CNS 15936 Laboratory Testing

CNS 15936 EMC testing is crucial for any multimedia or audio/video product entering the Taiwanese market. By working with an ISO 17025 accredited BSMI EMC test lab, manufacturers can ensure regulatory compliance, avoid delays, and support smooth global exports.

Applus+ Keystone provides globally recognized test reports and the peace of mind that all your EMC and certification testing needs are met under one roof. Our professional engineers provide constant communication and troubleshooting assistance throughout the entire testing process. Ready to get started? Request a quote to see why manufacturers trust Keystone with their EMC compliance testing needs.

Comparison with Other Standards

While CNS 15936 is specific to Taiwan, it is technically harmonized with international EMC standards, such as: