Compilation of emission and radiation requirements for class A devices in Vietnam

18:32, 11/07/2024

The Ministry of Information and Communications of Vietnam recently issued Circular 08/2018/TT-BTTTT on the National Technical Regulation on electromagnetic compatibility for multimedia equipment - Emission requirements.

Depending on the frequency above or below 1 GHz, different emission and radiation requirements in Vietnam will be applied for various Class A devices. To be specific:

Radiated Emission Requirements at Frequencies Up to 1 GHz for Class A Devices

Clause	Frequency Range (MHz)	Measurement			Class A Limit dB(µV/m)
Clause	Frequency Range (MHz)	Device (see Table 1)	Distance (m)	Detector/Bandwidth Type	Class A Limit dB(µV/m)
2.1	30 to 230	OATS/SAC	10	Quasi-peak/120 kHz	40
2.1	230 to 1 000	OATS/SAC	10	Quasi-peak/120 kHz	47
2.2	30 to 230	OATS/SAC	3	Quasi-peak/120 kHz	50
2.2	230 to 1 000	OATS/SAC	3	Quasi-peak/120 kHz	57
2.3	30 to 230	FAR	10	Quasi-peak/120 kHz	42 to 35
2.3	230 to 1 000	FAR	10	Quasi-peak/120 kHz	42
2.4	30 to 230	FAR	3	Quasi-peak/120 kHz	52 to 45
2.4	230 to 1 000	FAR	3	Quasi-peak/120 kHz	52
Apply clause 2.1 or 2.2 or 2.3 or 2.4 of Table 2 across the entire frequency range

Radiated Emission Requirements at Frequencies Greater Than 1 GHz for Class A Devices

Clause	Frequency Range (MHz)	Measurement			Class A Limit dB(µV/m)
Clause	Frequency Range (MHz)	Device (see Table 1)	Distance (m)	Detector/Bandwidth Type	Class A Limit dB(µV/m)
3.1	1 000 to 3 000	FSOATS	3	Average/1 MHz	56
3.1	3 000 to 6 000			Average/1 MHz	60
3.2	1 000 to 3 000			Peak/1 MHz	76
3.2	3 000 to 6 000			Peak/1 MHz	80
Apply clauses 3.1 and 3.2 of Table 3 across the entire frequency range from 1 000 MHz to the highest required measurement frequency taken as per Table 14

For further Class B device emission requirements, refer to Circular 08/2018/TT-BTTTT effective from July 1, 2019.

- Thanh Lam -

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