Taiwan: Emissions Testing for Information Technology Equipment, CNS 13438 Requirements

March 8, 2017

by Wayne Fisher, EMC Lab Manager,
NTS Silicon Valley

Manufacturers of Information Technology Equipment (ITE) intended for sale in Taiwan should take note that as of October 1, 2010 EMC testing requirements under emissions standard CNS 13438 have changed.

The Bureau of Standards, Metrology and Inspection (BSMI) requires radiated emissions both from 30MHz to 1GHz and conditions requiring testing upwards of 6GHz. Additionally, con­ducted emissions on telecommunication ports are required on all networking ports (IE: Ethernet).

The radiated emissions above 1GHz requirements are based on Amendment 1:2005 of CISPR 22:2005, which means testing is performed in a free space facility.

  • If the highest internal frequency source of the device under test is less than 108MHz radiated measurements are only performed up to 1000MHz.
  • If the device has an internal frequency source between 108MHz and 500MHz, the measurement shall only be made up to 2GHz.
  • If the frequency is between 500MHz and 1GHz, the measurement shall be only up to 5GHz.
  • If the frequency of the internal sources is above 1GHz the measurement shall be up to 5 times the highest frequency or 6GHz, whichever is less.

The Conducted Emissions on Telecommunication Ports requirements are the same as those in CISPR 22 with multi-speed ports operating at their highest data rate. Where there are many electrically identical telecommunication ports, multiple pre-scans may be required to determine the ‘worst case’ port for final evaluation.

The testing is performed with the device under test operating from line voltages consistent with Taiwan. For Class A devices, testing must be performed at both 110VAC and 220VAC or 230VAC, 60Hz. For Class B devices, testing need only be performed at 110VAC, 60Hz.

Products that were approved prior to October 1, 2010 will be accepted into the Taiwan market until their certificate is subject to renewal or if changes have been made to a product that needs re-certification after that date. At that point in time, products will need to demonstrate compliance with the new requirements.

New rules currently under draft may be implemented this year have indicated that all approvals must adhere to RoHS rules otherwise certificates will expire at the end of this year. Evidence of RoHS certification for the EU will be accepted by Taiwan towards this requirement.

Contact us at or call 800-270-2516 to know more about the steps you need to take to ensure compliance of your ITE products with the requirements of Taiwan.

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