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LANGER
EMV-Technik
DE-01728 Bannewitz
[email protected]
www.langer-emv.de
E1
Example for case 1:
Structural metal parts, shielding, metal housings, etc. are located directly alongside the electronic module
in the device under test. Disturbance voltage differences may occur between the metal parts and the
ground system if these parts are not solidly connected to the ground system of the electronics (Figure 30).
The disturbance voltage differences generate electric fields which act on the surface of the module. High-
resistance networks with pull-up or pull-down resistors in the range of 1 – 10 kΩ are especially sensitive to
these electric fields. The connections of quartz crystal circuits, reset or all pull-up/pull-down arrangements
are some practical examples.
Test set-up for case 2:
Figure 30: Practical example of a module which is affected by the electric field of a neighbouring
structural part.
Figure 31: Injection with the ES 00 field source.
Attention: Moving your hand or
metallic objects towards the
measurement set-up will
influence the measurement
result!
