EM TEST
UCS 500 Series
Operating Manual
V 3.05
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9.4.2.
Capacitive coupling clamp
- The coupling clamp is not matched by 50 ohm. If the clamp is matched there exists an additional magnetic
coupling, which may cause completely different test results.
- The clamp should be placed in a distance of 0.5m to the equipment under test. When using shorter distances,
the EUT may be influenced by radiation.
- If the EUT is built up by two different equipment, the test should be conducted on each single equipment with
the required distance.
Generator
UCS 500
EUT 1
EUT 2
Signal
Signal
Ground reference
Capacitive coupling clamp
100 pF
Decoupling
network
Coupling to signal lines or lines where no galvanic
contact is possible (e.g. shielded lines)
0.1m
Decoupling network
Net
Net
0.5m
0.5m
9.5.
Burst Test Setup
- The test generator and the coupling network should be connected to the reference ground plane (acc. to high
frequency requirements).
- The equipment under test must be isolated from the reference ground plane. The distance should be 10cm.
Being part of the EUT, these requirements are also recommended for all connected cables. The EUT should
only be grounded if this is recommended by the installation guideline. For safety reasons, the test without any
ground connection should be conducted as well (at 100MHz 1m ground cable has an impedance of about 600
ohm)
- Whenever possible the test set-up and the cabling should always be the same; e.g. for testing power lines it
would be possible to fix the cables on the test table for all tests in the same way.
- Lines under test and all other lines should be decoupled strictly.
Generator
UCS 500
EUT
Ground reference
Coupling to power supply lines
>Net
<= 1 m
Coupling Network
Ck
Z
L1 L2 L3
N
PE
10cm
