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The radio interference of electric equipment allows a value
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One, home appliance (GB4343-84)
.15-30Mhz (dBuv)
Frequency paragraph home appliance is dynamoelectric tool
<700w <1Kw <2Kw
.15-.20 70 70 70 76
.2-.5 66 66 70 76
.5-5 60 60 64 70
5-30 66 66 70 76
30-300Mhz (dBpw)
Frequency paragraph home appliance is dynamoelectric tool
<700w <1Kw <2Kw
30-300 45-55 45-55 49-59 55-65(is linear)
Annotations: Above all is to point to permanent power, right intermittent interference should increase value 20log(30/N) , among them.2<N<30 is led for sound of cough up Li.
Add 44dB to be successive interference when N>30 when N<.2
2, semiconductor regulating unit
.15-30Mhz (dBuv)
Frequency paragraph power source carries laden end to assist end
.15-.5 66 80 80
- 5 60 74 74
- 30 60 74 74
3, absoluteness use frequency paragraph (MHz)
6.765-6.795 13.553-13.567 265.957-27.283 40.660-40.700