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EMC

Index | CISPR 25 ECE R10 EN 55032 / CISPR 32 FCC Part 15
CE RE

FCC Part 15 Radiated Emission (RE) Limits

FCC Section 15.109 – Radiated Limits

Quick reference for FCC Part 15 limits (Section 15.109 Radiated Emissions). View Class A (10m) and Class B (3m) digital device field strength limits in μV/m and dBµV/m.

Class B (3m distance)

Frequency of emission (MHz) Field strength (μV/m) Field strength (dBµV/m)
30 - 88 100 40.0
88 - 216 150 43.5
216 - 960 200 46.0
Above 960 500 54.0

Class A (10m distance)

Frequency of emission (MHz) Field strength (μV/m) Field strength (dBµV/m)
30 - 88 90 39.1
88 - 216 150 43.5
216 - 960 210 46.4
Above 960 300 49.5

FCC Part 15 Radiated Emission Overview

FCC Part 15.109 specifies the radiated emission limits for unintentional radiators. These limits are designed to prevent electromagnetic interference with licensed communications services.

Measurement Distance: The limits for Class B devices are typically specified at a measuring distance of 3 meters. The limits for Class A devices are typically specified at a measuring distance of 10 meters. If measurements are made at a different distance, an extrapolation factor (typically 20 dB/decade) must be used.

Calculations: The standard specifies field strength in microvolts per meter (μV/m). For engineering convenience, this page also provides the values converted to decibel microvolts per meter (dBµV/m) using the formula: dBµV/m = 20 * log10(μV/m).