Frequency range, f | Lower action value for electrical field strength (E) [Vm ^{-1}](RMS) | Lower action value for power density (S) [Wm^{-2}] |
---|---|---|

1 Hz ≤ f < 25 Hz | 2.0 x 10^{4} | – (Value not given in the Directive, but can be calculated based on E. S=E ^{2} /120π) |

25 Hz ≤ f < 3 kHz | 5.0 x 10^{5} /f | – |

3 kHz ≤ f < 3.59 MHz | 170 | – |

3.59 MHz ≤ f < 10 MHz | 6.1 x 10^{8} /f | – |

10 MHz ≤ f < 400 MHz | 61 | – |

400 MHz ≤ f < 2 GHz | 3,0 x 10^{–3} f^{1/2} | – |

2 GHz ≤ f ≤ 300 GHz | 140 | 50 |

^{2}. The local maximum power density, calculated as the mean value for 1 cm

^{2}, should not exceed 20 times 50 Wm

^{-2}. The power density from 6 to 10 GHz is calculated as the mean value for a six-minute period. Above 10 GHz, the power density is calculated as the mean value over a 68/f

^{1.05}-minute-period (where f equals the frequency in GHz) to compensate for a gradual decline in penetration depth as the frequency increases.