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profibus Radiated immunity problem

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ShuklaS

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I have design the profibus board and its falling in Radiated immunity test ,can anyboby suggest the reson the transiver is of TI
 

Changed my post because the answer was not to the point. FvM answer below is to the piont.
 
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Which error has been triggered in the immunity test (transmission error, controller reset ?). Do you observe a wide band succeptibilty or effects at discrete frequencies only? Did you try to place a RF bypass between isolated grounds? Are the optocouplers equipped with internal shields and qualified for PROFIBUS usage?
 

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