White Paper: Test & Measurement

Designing for EMI Testing


Today, R&D engineers face challenging time-to-market goals. Extending the product development schedule and delaying the product launch can prove to be extremely costly in terms of opportunity cost and lost market share. Nearly 50 % of products fail EMC compliance the first time.

Every day spent on debugging, isolating, and correcting the EMI problem increases the time to market. The time lost could have been used to work on another project or on improving the design instead.

To address these challenges, it makes sense to perform EMI tests during the product design cycle in order to reduce the possibility of failing EMC compliance, which typically comes at the end of the development cycle of a product. The cost of fixing EMI problems too late in the development cycle can prove to be expensive. Preventive measures integrated into design cycle checkpoints can help avoid costly project delays.

Most, if not all R&D engineers use oscilloscopes throughout their product design cycle to capture waveforms, verify serial buses, and debug unwanted signals. Adding the capability of using the oscilloscope to perform EMI testing would eliminate the need to purchase other equipment.

In the past, oscilloscopes were not commonly associated with EMI testing due to FFT limitations. However, that changed with the R&S®RTO/RTE digital oscil-loscopes which come with the industry-leading implementation of FFT digital downconversion and overlapping FFT.

This step-by-step guide leads you through three important steps to take advantage

of the unique features of the R&S®RTO/RTE digital oscilloscopes and perform EMI testing in the product design cycle: locating, capturing, and analyzing emissions with different correlations and tactics.

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