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LANGER
DE-01728 Bannewitz
mail@langer-emv.de
EMV-Technik
www.langer-emv.com
1 Measurement procedure
The ESA1 is suitable for carrying out comparative measurements of disturbances emitted by
modules directly at the developer's workplace. Since the effect of any changes to the module
becomes evident immediately, the time needed to optimize the unit under test can be dramatically
reduced.
Measuring with the ESA1 development system is based on the following considerations:
In most cases, it is not a component or conductor track of a unit under test that directly emits any
disturbances, rather the entire metal system of the unit under test is excited through electric or
magnetic coupling (i.e. in the near field). This metal system comprises the PCB itself and all
connected cables and metal parts such as housings, shielding plates etc. in its immediate vicinity.
The system in its entirety acts as an antenna and a source of emission. This excitation is roughly
equivalent to the disturbances emitted by the unit under test. To determine this excitation, measure
the exciting currents that flow, for instance, from a PCB to any cables connected.
The measurements are performed with a conductive ground plate to reduce any influences of the
measurement set-up, cable positions and local fields. Inject all exciting currents through short
capacitive coupling into the ground plate so that you have a small reproducible set-up (Figure 1).
Figure 1
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ESA1
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