EMI test receivers

Navigate the complexity of EMC testing with confidence - from first measurements to final certification

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Q: What is an EMI test receiver and how does it fit into EMC testing?

An EMI test receiver is used to measure unwanted electromagnetic emissions from electronic devices. It is the core of EMC emissions testing following standard requirements for resolution bandwidths, detectors (quasi-peak, CISPR Average, CISPR RMS), measurement routines and – as most important – the demanding dynamic range to measure high interference amplitudes while achieving a low noise floor and high sensitivity. A full compliant EMI receivers fulfills all CISPR, FCC, EN, ISO, MIL-STD or other global standard requirements while precompliance EMI receivers allow economic precertification with a high certainty.

Q: What is the difference between an EMI receiver and a spectrum analyzer?

An EMI receiver is designed specifically for EMI testing with best dynamic range even in presence of wideband interferences. This is achieved by dedicated preselection filters and low noise components. A spectrum analyzer is more general-purpose instrument with a focus on widest bandwidths and highest digital signal processing capabilities. Another important difference is the EMI receivers scanning vs. the spectrum analyzers sweeping, showing different behavior particularly for intermittent interference testing. Spectrum analyzers offer great value for general EMI analysis or debugging.

Q: How does FFT-based time-domain scanning improve EMI testing speed?

FFT-based time-domain scanning processes thousands of frequency points simultaneously, enabling measurement speeds much faster than the traditional stepped scan. This helps engineers improve reliability for emission detection, provides better insight into transient signals and significantly shortens compliance test cycles.

Q: What is the difference between compliance and pre-compliance EMI testing?

Compliance testing requires compliant instruments and accessories that are also accredited calibrated to regularly verify compliance to international standards. Pre-compliance testing uses pre-compliance receivers with similar detector types but relaxed tolerances. It helps identify potential failures early at best during the development of the product to reduce redesign loops and lower certification costs.

Q: How can pre-compliance EMI testing support product development?

Pre-compliance receivers (e.g., R&S®ESRP or R&S®EPL) allow developers to detect emission problems early in the development stage. At this point, changes are easier to adapt to reduce development cost and shorten the time-to-market. The final stage of the certification process will then be a compliance test to achieve certification, ideally without additional rejection loops thanks to pre-compliance testing before finalizing the product.

Q: What software tools support EMI measurements with Rohde & Schwarz EMI test receivers?

R&S®ELEKTRA automates complete EMC test workflows, including limit line comparison, sequencing, conducted/radiated test execution, and reporting. It improves accuracy, reduces manual effort, and enables integration into automated test systems. R&S®ELEKTRA offers solutions for all EMC standards as well as other testing requirements typically performed in the same testing environment.

EMC testing can feel like a dense jungle of standards and setups. Rohde & Schwarz EMI test receivers clear the path with rigorous emission detection, precise analysis and workflows aligned to every major standard. They support commercial, automotive and military EMI standards from all leading standard authorities, including IEC, CISPR, CENELEC, ETSI, FCC, ANSI, RTCA and MIL-STD.

Fast FFT-based time-domain scans make testing many times faster than conventional frequency scans. The instruments cover all required frequency ranges up to 44 GHz, with measurements up to 500 GHz supported by external mixers. Choose full-compliance receivers for certification or precompliance receivers for development and EMI troubleshooting – both implement bandwidths, limits and detectors defined by the standards. All EMI receivers also include a full signal and spectrum analyzer in the same instrument.

At a glance:

Standards coverage: IEC, CISPR, CENELEC, ETSI, FCC, ANSI, RTCA, MIL-STD
Speed: FFT-based time-domain scan for significantly faster test cycles, optional FFT bandwidth extensions up to 970 MHz
Frequency: up to 44 GHz native, up to 500 GHz via external mixers
Efficient Workflows: automated tests and compelling reports to save you time while ensuring accuracy
Instrument options: full compliance or precompliance, real time spectrogram, click rate analysis and much more

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Three pillars of confidence

Proven precision you can rely on

Expertise you can rely on

Our EMI receivers are the market reference. They deliver speed, accuracy, reliability and reproducibility across every relevant EMC standard. With clear detectors, limit lines and reporting, you can trust your results will match what you see in the chamber.

Confidence at every stage of EMC testing

Consistent performance from bench to chamber

From early debugging to precompliance and final certification, our portfolio supports you at every step. You start with the right tool on the bench, keep the same approach in the lab, and finish with full compliance in the chamber. This consistency helps you find issues earlier and avoid late surprises.

Consistency that pays off

Long-term reliability that keeps projects on track

Future-proof instruments that last and prevent surprise failures and roadblocks. Designed to reduce retests and delays, they offer a return on investment that is as reliable as the measurements themselves.

Trade-in your old EMI compliance receiver

Save up to 25% trade-in credit for R&S®ESR or R&S®ESW

The R&S®ESW and R&S®ESR test receivers enhance the user experience by offering a bigger touch screen, dramatically improved measurement speed, the possibility of real-time spectrum analysis and the overall ability to take on more tasks. Save now and experience improved options of the EMI test receivers.

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EMI test receivers FAQ

What is an EMI test receiver and how does it fit into EMC testing?

What is the difference between an EMI receiver and a spectrum analyzer?

How does FFT-based time-domain scanning improve EMI testing speed?

What is the difference between compliance and pre-compliance EMI testing?

How can pre-compliance EMI testing support product development?

What software tools support EMI measurements with Rohde & Schwarz EMI test receivers?

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