Frequency
Cycles per second, the axis that determines which limit applies, which meter can see the signal, and which shielding works.
Symbol fSI unit Hz
Last verified 12 August 2026.
Also searched as: Hz, GHz, MHz
- Symbol
- f
- SI unit
- Hz
- Units in use
- Hz, kHz, MHz, GHz
What it measures
Signal repetition rate. EMF work splits at roughly 100 kHz: below it, effects and limits are about nerve stimulation and fields are treated as electric and magnetic separately; above it, limits are about energy absorption and the two components are linked.
Units
Multiplier to the SI unit (Hz).
- Hz (hertz)
- 1 Hz = 1 Hz
- kHz (kilohertz)
- 1 kHz = 1,000 Hz
- MHz (megahertz)
- 1 MHz = 1,000,000 Hz
- GHz (gigahertz)
- 1 GHz = 1 × 10^9 Hz
Sources
- nist-si The International System of Units (SI), NIST Special Publication 330 — National Institute of Standards and Technology. government, link checked 2026-08-12.
- icnirp-2020 Guidelines for Limiting Exposure to Electromagnetic Fields (100 kHz to 300 GHz) — International Commission on Non-Ionizing Radiation Protection, 2020. guideline, link checked 2026-08-12.
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