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2.1.1 Requirements for the common mode impedance
Main parameter of the CDNs is the common mode impedance |Z
The standard IEC/EN 61000-4-6 specifies the performance of CDN for the frequency
range from 150 kHz to 80 MHz.
Frequency range
|Zce|
Table 1
2.1.2 Test level
U
0
in r.m.s., typical test levels are 1 V, 3 V or 10 V. The test level is set at the EUT port of
the coupling network. For immunity testing, this signal is 80 % amplitude modulated
with a 1 kHz sine wave to simulate actual threats.
Using the set-up in Figures 3 or 4, the test generator shall be adjusted to yield the
following reading on the measuring equipment.
U
mr
U
mr
NOTE 1:
U
0
equipment. To minimize the testing error, the output level of the test generator is set by
setting U
NOTE 2:
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 G to 50 G adapter terminated by the 50 G measuring equipment.
Operating Manual 1309.8978.14-01
Requirements for |Zce|
is the open-circuit test level (e.m.f.) of the unmodulated interfering signal, expressed
= U
/6 ± 25 %, in linear quantities, or
0
= U
– 15.6 dB ± 2 dB in logarithmic quantities.
0
is the specified test level and U
with a 150 G load and not by setting U
mr
150 kHz – 26 MHz
150 G ±20 G
is the measured voltage of the measuring
mr
.
0
Operation
| at the EUT port.
ce
26 MHz – 80 MHz
150 G +60 G/-45 G
8
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