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In radiated emission testing, based on the measurement of the total radiated power by using reverberation chambers and TEM devices, the e-field strength is correlated with the radiated power by assuming the maximum directivity of the equipment under test (EUT). For small EUT, the directivity of a short dipole is often used. This work describes how the emission e-field strength of small EUT was measured by using the substitution method in a reverberation chamber. These results were compared with those obtained using a GTEM-cell and an anechoic chamber. The experimental results showed an error caused by the assumption of the directivity in the correlated e-field strength; however, the reverberation chamber effectively measured the total radiated power. The total radiated power of the EUT with the directivity of a dipole measured by using a GTEM-cell was shifted 6 dB lower than that measured with a reverberation chamber.