如何满足EN61000-4-6:2009 6.4.1 条款 Seting of the output level at the EUT port of the coupling device，即输出到耦合器EUT端信号能量设定验证的要求？
yvxC/Jo4 Yf:utCvv The test generator is connected via a 6 dB attenuator to the RF port of the coupling device. The EUT port of the coupling device is connected in common mode through the 150 ohm to 50 ohm adapter to a power meter with 50 ohm input impedance. the AE port is terminated with 150 ohm. The setup for level setting (also called calibration) is shown as an example in the figure below:
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+^+wS`Y ke>\.|HT} Using the above-mentioned set-up, the test generator shall be adjusted to yield the following reading on the measuring equipment.
RQ,(?I*8\ Umr = U0/6 ± 25 %, in linear quantities, or
oz5o=gt7 Umr = U0 – 15,6 dB ± 2 dB in logarithmic quantities.
YY!(/< VI R~*Y@_oD U0 is the test voltage specified in Table 1
and Umr is the measured voltage as defined in 3.11. The factor 6 (15,6 dB) arises from the e.m.f. value specified for the test level. The matched load level is half the e.m.f. level and the further 3:1 voltage division is caused by the 150 Ω to 50 Ω adapter terminated by the 50 Ω measuring equipment. Following equivalent circuit diagram will help you understand it clearly:
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\wRr6-!_ |>3a9] l !AZ$IV Bhq(b V According to above principle, measured voltage in Vmr and measured power in dBm are calculated as follows:
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pWx3l5)R b<( W}$x 1 0.1667 -2.55
;ZqFrHI M` C95,!q 3 0.5 6.99
9bNI aC*M y*(YZ zF 10 1.667 17.45
!xc7~D@om( K?tk&0 4AM*KI 0@Ijk(| If take CDN as an example, test level setting procedure is explained by following figure:
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Sf=[>z =eqI]rVj^ wF uh6!J The calibration setup always refers to the type of CDN. Let me give out more details about test setup calibration with CDN M016 (switchable M2/M3).
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