Evaluation Engineering - 8

INSTRUMENTATION

Rohde & Schwarz EMC testing equipment in an
EMC testing chamber.

SPECIAL REPORT

CISPR COMPLIANCE,
REAL-TIME ANALYSIS
DRIVING INNOVATION IN
EMI/EMC INSTRUMENTS
By Mike Hockett, Editor-in-Chief
The fields of electromagnetic interference (EMI) test and electromagnetic
compatibility (EMC) test go hand-in-hand,
providing measurements, debugging, precompliance, and full compliance testing
for a wide variety of electronics. EMI/EMC
testing is a vital stage in a product's lifecycle, ensuring that products function as
intended, and that testing is done on instrumentation ranging from benchtop
oscilloscopes, to modest sized chambers,
to large test chambers for aircraft.
To learn what factors are driving innovation in EMI and EMC testing, we at
Evaluation Engineering asked a pool of
electronic test & measurement vendors
and partners about the trends, challenges,
and customer demands they're seeing, as
well as what newer EMI/EMC test solutions they've put on the market. Here's
what they told us.

8

EVALUATION ENGINEERING JULY 2019

What's trending?
What new or ongoing trends are vendors
seeing among EMI/EMC receivers and
amplifiers?
Dylan Stinson, RF products manager,
and Alex Krauska, RF products system
engineer at Tektronix: "While CISPR 16
compliant receivers are necessary for
complying with EMI compliance standards, customers can get away with using non-CISPR 16 compliant real-time
spectrum analyzers (RTSA) when performing their own in-house precompliance EMI testing. This allows product
developers to rest assured knowing that
their product is going to pass compliance in its first attempt through the
compliance lab-reducing the chances
of costly late-stage redesigns and trips
to the test house.

"The advantages of an RTSA is the ability to capture RF pulses as short as 15 us,
digital modulations, and other pulsing or
fast-changing signals. In addition, they can
capture and process data much faster than
traditional swept EMI receivers or spectrum analyzers-there's no need to wait
seconds or minutes to capture a spectrum,
even when using detectors at narrow resolution bandwidths (RBW). This allows for
very fast troubleshooting, since you can see
the result of fixes immediately. Tektronix
RTSAs also feature EMI precompliance
and troubleshooting software that walks
the user through the process of performing FCC, CISPR, or MIL-STD radiated or
conducted emissions tests.
"Most of the high-risk EMI tests are
easily performed with low-cost RTSAs.
The cost savings by performing troubleshooting and precompliance at your own
facility can amount to hundreds of thousands of dollars and weeks or months of
product delays. RTSAs have already
proven to be invaluable for EMI debug
and troubleshooting. Advanced spectral
analysis will be especially important as
mobile devices continue to shrink and
more products incorporate wireless and
other advanced digital modes."
Jeremy Cline, product manager at Rohde
& Schwarz North America: "The need for
more insight into the source of potential
interferer continues to grow, and simple
pass/fail results are no longer sufficient.
EMI receivers today also need to provide
capabilities that help the developer to
diagnose the signals and their origins.
Real-time spectrum analysis allows for
detailed investigation of disturbances.
Persistence mode also allows identifying
signals within signals, where narrowband
interferers can be seen despite an overlaying broadband interferer. FFT-based time
domain scan enables ultrafast measurements, which now allows designers to run
their tests many times over and optimizing their design between tests. EMI receivers also continue to improve their RF
performance and measurement accuracy.



Evaluation Engineering

Table of Contents for the Digital Edition of Evaluation Engineering

Editorial: Following up on "brain drain" in test engineering
By the Numbers
Industry Report
Special Report: EMI/EMC Recievers and Amplifiers
Special Report: Semiconductor Test
Compliance: Recent developments in EMC legislation
Components: MEMS technology is transforming high-density switch matrices
Design for Test: DFT that gets AI chips to market faster
Wireless Test: Q&A: simulation's vital role in wireless testing
Tech Focus
Featured Tech
Industry Events Preview
Wearable Electronics: Putting on the future
Evaluation Engineering - Cover1
Evaluation Engineering - Cover2
Evaluation Engineering - 1
Evaluation Engineering - 2
Evaluation Engineering - 3
Evaluation Engineering - By the Numbers
Evaluation Engineering - 5
Evaluation Engineering - Industry Report
Evaluation Engineering - 7
Evaluation Engineering - Special Report: EMI/EMC Recievers and Amplifiers
Evaluation Engineering - 9
Evaluation Engineering - 10
Evaluation Engineering - Special Report: Semiconductor Test
Evaluation Engineering - 12
Evaluation Engineering - 13
Evaluation Engineering - 14
Evaluation Engineering - 15
Evaluation Engineering - Compliance: Recent developments in EMC legislation
Evaluation Engineering - 17
Evaluation Engineering - 18
Evaluation Engineering - Components: MEMS technology is transforming high-density switch matrices
Evaluation Engineering - 20
Evaluation Engineering - 21
Evaluation Engineering - Design for Test: DFT that gets AI chips to market faster
Evaluation Engineering - 23
Evaluation Engineering - 24
Evaluation Engineering - Wireless Test: Q&A: simulation's vital role in wireless testing
Evaluation Engineering - 26
Evaluation Engineering - Tech Focus
Evaluation Engineering - Featured Tech
Evaluation Engineering - 29
Evaluation Engineering - Industry Events Preview
Evaluation Engineering - 31
Evaluation Engineering - Wearable Electronics: Putting on the future
Evaluation Engineering - Cover3
Evaluation Engineering - Cover4
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