Evaluation Engineering - 26

EMC TEST

a stub probe and is sensitive to electric
fields. The loop probes have integrated
electrostatic shields, providing isolation
from common-mode signals. As a result,
these probes deliver excellent repeatability. The different loop sizes allow the user
to select the optimum probe for a given
frequency, providing the optimum sensitivity and spatial resolution."
Saelig Co. Inc. also offers EMC test
equipment from a variety of manufacturers, including spectrum analyzers from
Aaronia, Aim-TTi, Rigol, Siglent, and
Triarchy; fieldmeters and probes from
EMC Test Design LLC; shielded enclosures from Ramsey Electronics; probes,
amplifiers, LISNs, and TEM cells from
Tekbox; radiation measurement systems
from MegiQ; and EMI test enclosures
from Select Fabricators. Applications
include near-field probing for EMC precompliance test1 and immunity testing
using a TEM cell2 .
As this article was being prepared for
publication, organizers of the 2020 IEEE
EMC + SIPI Symposium were still planning to hold the live event July 27-31 in
Reno. Commenting on the issue, Landers
at AR RF/Microwave Instrumentation
said, "We plan on attending and will be
showcasing our AA Series and other test
systems, emcware 5.0, and a full chamber
setup from our partner Comtest."
Anritsu plans to highlight the Radio
Communication Test Station 8000A
and Radio Communication Analyzer
MT8821C. "These solutions enable a
range of regulatory and compliance testing, including EMC certification for FCC,
ISED, and EU RED, on 5G NR devices,"
said Yasami.
Gauss plans to demonstrate its
TDEMI ULTRA and its automation software EMI64k, according to Braun. Hu
at Keysight said the company plans to
highlight its N9048B PXE EMI receiver
with its Time Domain Scan/Accelerated
Time Domain Scan and Real Time Scan
capabilities. Gross at Rohde & Schwarz
said the company plans to highlight
products including R&S ELEKTRA, the
fast TDS function for the R&S ESW, R&S
AdVISE v5 with optical character recognition (OCR) for text and numbers as well
as image stabilization, the R&S ESW-K58

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Multi CISPR APD measurement option
for the R&S ESW test receiver, and the
R&S FPL1-K54 EMI measurement option
for the R&S FPL1000 spectrum analyzer.

Features and challenges
Several contributors to this report elaborated on challenges of EMC test and features that can help engineers meet those
challenges. "Many companies are trying
to overcome the EMC hurdle without a
deep understanding of the physical issues
involved, and who can blame them?" said
Chonko at Siglent. "Electromagnetics is
not trivial, and designs are becoming increasingly complex. Most EMC-targeted
instrumentation is also expensive. Since
many companies are trying to achieve
compliance certification without breaking the bank, Siglent's goal is to provide
tools that get the job done with minimal
cost. Quasi-peak detector capability,
multitrace viewing, spectrum/waterfall
charting, on-screen limit lines, and realtime spectrum acquisition are all features
that help lower EMC test time, and Siglent
delivers them at affordable prices."
Gross at Rohde & Schwarz said customers look for easy-to-handle test software for pre-compliance tests during
the product development, as well as for
automated compliance tests. "To meet
these needs, Rohde & Schwarz will successively replace its well-known R&S
EMC32 automation software," he said.
"The new R&S ELEKTRA EMC test suite
facilitates interactive and/or fully automated measurements for pre-compliance
and certification tests for both electromagnetic interference (EMI) and electromagnetic susceptibility (EMS) for all
relevant standards."
Gross also noted that engineers are
starting their EMC investigations earlier
in the development process, adding that
Rohde & Schwarz helps with spectrum
analyzers suitable for these tasks. "In
combination with the new R&S FPL1-K54
EMI measurement option, the R&S
FPL1000 all-round spectrum analyzer
measures emissions in line with CISPR
and MIL standards and makes fast pass/
fail decisions," he said.
"The spectrum analyzer remotely controls LISNs, and has the corresponding

correction factors built-in. For pure debugging tasks, the R&S FPC1000 spectrum
analyzer together with the high-quality
R&S HZ-17 near-field probe set and the
R&S HM6050-2 LISN is a good choice. This
combination allows developers to detect
both radiated and conducted interference."
The R&S ELEKTRA EMC test software
supports analyzers as well as other instruments and accessories, he added.
Mologni at Ansys commented that the
company's simulation tools are used in
the early stages of a development cycle.
The tools, "...empower engineers to tackle
different problems such as signal integrity, power integrity, EMI, and radiofrequency interference (RFI)."
He added that many electrical and
thermal issues that affect PCBs-EMI,
crosstalk, power integrity, overheating,
etc.-adversely impact the overall signal
integrity of electronic devices. Automated
techniques combine the best attributes
of two solvers-in this case, the accuracy of HFSS and the speed and capacity of SIwave-to mitigate SI problems of
high-speed data channels in complex and
dense printed circuit boards.
"Automatic adaptive mesh refinement
techniques in Ansys EM tools accurately
model complex PCB, IC, and package
designs for DCIR analysis to predict the
power integrity of these designs," Mologni
said. "Design-rule checkers in Ansys tools
identify potential problems in high-speed
electronic systems prior to running simulations, saving time and effort which may
otherwise be spent in making costly design changes late in the development
cycle. These simulations eliminate errors
and reduce PCB re-spins."
vanEijkelenburg at Pacific Power commented that for final test, full compliance
to the applicable standard is of paramount
importance. "This also implies that measurements must be both repeatable and
reproducible," he said, adding that other
important issues are the ability to test a
wide range of products in terms of power
level and phase modes with as much sharing of test hardware resources as possible
to manage test system cost. "Finally, report generation that documents compliance of the product is important for audit and verification purposes," he added.

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