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EMI Pre-Compliance Guide RIGOL Technologies
RIGOL Technologies CO., LTD. 09.09.2021
On the other side, the DUT might be affecting a complete different independent system with
EMI interferences which are inter-system disturbances. For example, at a radio it could be
happened that a specific noise is hearable over the speaker when a mobile phone is ringing.
Interferences could be coupled by:
- Galvanic coupling (G-C): when two electric circuits using same impedance (e.g. same
GND)
- Inductive coupling (I-C): when two (or more) conductor loops with current flow
influence each other with magnetic field
- Capacitive coupling (C-C): when two electric circuits have different voltage potential
- Electromagnetic coupling (EM-C): Wavelength is smaller than the geometry and EM
wave radiated to environment of DUT and / or other sections of DUT.
To find a root cause coupling path in a DUT is very difficult, because coupling path could also
be a combination of different couplings (e.g. G-C and C-C. at the same time). To find a solution
for a detected coupling path is comparatively simple.
The next part of this document describes the test tool RSA5000N with the new EMI mode
which is the tool for pre-compliance analysis.
EMI Mode of Real Time Spectrum Analyzer RSA5000N / RSA3000N
The RSA5000N / RSA3000N are multifunctional spectrum analyzer including a general
purpose spectrum analyzer [GPSA], a real time analyzer [RTSA], a vector signal analyzer
[VSA], vector network analyzer [VNA] and an EMI mode for pre-compliance tests. Therefore
these devices are the best combination of high performance and flexibility and an optimal
test solution for EMI pre-compliance analysis. For some EMI measurements, the real time
mode could be a big benefit for some analysis to get a better overall picture of the problem
or see more behavior of DUT. The GPSA mode could be used to measure single components
of a DUT like an amplifier and with VSA mode, the modulation quality or BER of an RF output
could be measured e.g. during susceptibility stress.
The new EMI mode offers a lot of new functionalities and advantages for pre-compliance tests
and will be described in detail:
Scan Table
During the conformity check (conducted and radiated emission / susceptibility), a test
receiver [TR] is generally used in a test laboratory. However, a TR has several disadvantages.
It is a very expensive test tool and only usable in the field of EMC. A spectrum analyzer [SA]
on the other hand, measures faster and can be used for different applications and is
significantly cheaper, especially at RIGOL. However, a TR has significant advantages in EMC
measurements comparing to an SA. TR using a pre-selection which allows to use a different