Download Space engineering Electromagnetic compatibility

ECSS-E-20-07A Draft
4 April 2008
c.
3.
Verify the AC current level, as measured with the probe by comparison with
the voltage on the T derivation.
4.
Scan the measurement receiver for each frequency in the same manner as a
normal data scan, and verify that the data-recording device indicates a level
within ±3 dB of the injected level.
5.
If readings are obtained which deviate by more than ±3 dB, locate the source
of the error and correct the deficiency prior to proceeding with the testing.
Test the EUT by determining the conducted emission from the input power leads,
hot lines and returns separately, and from each interconnecting bundle (common
mode), including the ones with power leads, as follows:
1.
Turn on the EUT and wait until it is stabilized.
2.
Select a lead or a bundle for testing and clamp the current probe into position.
3.
Scan the measurement receiver over the frequency range, using the
bandwidths and minimum measurement times specified in Table 5-2, clause
5.3.9.1.
4.
Repeat 5.5.3.4.c.2 and 5.5.3.4.c.3 for each power lead or for each bundle.
Measurement
receiver
Oscilloscope
50Ω input
Signal
generator
Data
recorder
50Ω coaxial
load
Current probe
inside jig
6dB
T-connector
LISN
To power source
Figure 5-7: Conducted emission, measurement system check
Measurement
receiver
Data recorder
Current
probe
LISN
EUT
To power source
Figure 5-8: Conducted emission, measurement setup in differential mode
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