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LANGER
DE-01728 Bannewitz
mail@langer-emv.de
EMV-Technik
www.langer-emv.com
3 Practical procedure
3.1 Measuring with ESA1
The measurements carried out with the ESA1 are relative measurements. Thus it is important to
define a measurement set-up and document the initial state first.
Measuring results from previous measurements under standard conditions provide crucial
information on critical frequency ranges and the extent of necessary improvements. First analyze
the measurement set-up required for these measurements:
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How have the PCBs been installed in the unit under test?
Which connected cables are possible decoupling paths?
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How do these cables run inside and/or outside the unit under test? (e.g. cable harness in the
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car in the immediate vicinity of a large metal surface)
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Which metal parts such as housing, shielding, stud bolts, water pipes etc. are in the immediate
vicinity (capacitive coupling)?
These considerations help determine modules and parts of modules as potential RF sources and
find the paths by which the high-frequency currents are possibly emitted. This information allows
you to design a measurement set-up so that the decisive emitted currents can be measured.
To confirm the measurement set-up, compare your measurement results with the results obtained
in far-field measurements. There will be deviations of course. However, it is crucial in this
comparison to find critical frequencies from far-field measurements with the chosen measurement
set-up and thus to prove the existence of the suspected sources and associated decoupling paths.
3.2 ChipScan-ESA software
ChipScan-ESA is a universal tool in the development of electronic modules which allows the
developer to manage the disturbance emission data measured with a spectrum analyzer.
The software enables:
a quick and easy configuration of spectrum analyzers
the logging of measured data for a quick comparison and for documentation
the linear/logarithmic plotting of measured data in 2D/3D diagrams
the storage of measured data for subsequent evaluation and comparison with further
measured data if necessary
the export of measured data as an image for publication, documentation, etc.
the export of measured data as a .csv file for further processing in Excel, Matlab,
Origin, R, etc.
Hereafter the software's characteristics are described in detail.
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ESA1
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