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) |
||||
Device (see Table 1) |
Distance (m) |
Detector/Bandwidth Type | |||||
2.1 | 30 to 230 | OATS/SAC | 10 | Quasi-peak/120 kHz | 40 | ||
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 | ||
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 | ||
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 | ||
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)
|
||
Device (see Table 1) |
Distance (m) |
Detector/Bandwidth Type | |||
3.1 | 1 000 to 3 000 | FSOATS | 3 | Average/1 MHz | 56 |
3 000 to 6 000 | 60 | ||||
3.2 | 1 000 to 3 000 | Peak/1 MHz | 76 | ||
3 000 to 6 000 | 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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