2011 EMC Directory & Design Guide - Interference Technology

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testing & test equipment Troubleshooting Radiated Emissions oscillator with fast edge speeds, the harmonic content can be estimated with the formula in Equation 1. Equation 1. Maximal RE frequency estimate, where f = EMI frequency (Hz) and t r = risetime (seconds). For example, with 1 nsec logic, the harmonic content may be centered around 300 MHz. Another rule of thumb is that for frequencies below about 300 MHz, the problem is most likely due to common-mode emissions from cables and above that; the problem is most likely radiation from slots or seams in the metal chassis or circuit board radiation. Figure 2. Examples of DIY antennas for radiated emissions troubleshooting. The “rabbit ears” are resonant from 65 to 200 MHz, while the bowtie works well from 300 to 800 MHz. I installed a television-style balun to better match to 50-ohm coax for the bowtie. Dimensions The dimensions of physical structures are also an important factor in troubleshooting an emissions problem. Recall that the wavelength (m) of a resonant wire at frequency, f, in free space is: likely the coupling path is radiated. The lower the frequency, the more likely the path is conducted. In fact, the common break frequency during compliance testing is 30 MHz. Below that, we measure conducted emissions (CE) – above that we measure RE. If your product uses a high-frequency crystal 8483 Retlif EMC_ITEM ad 2/3/11 2:36 PM Page 1 Equation 2. Wavelength of a wire in free space, where c = speed of light in m/s and f = frequency in Hz. The dimensions of physical structures, like circuit boards, must be reduced by the velocity factor of the board mate- On-site, or in one of our three laboratories, Retlif is ready, willing and able to provide EMC/EMI testing and engineering support. We’re ready…with state of the art equipment in all our labs. We’re willing…with a dedicated, highly trained staff. We’re able…with in-house engineering support. Count on Retlif’s testing leadership for EMC and Lightning testing services to national and international standards. Trust your equipment and systems to Retlif for shielded Effectiveness testing, EMP, high level radiated susceptibility testing and low noise level emissions testing. Leading military, aerospace, commercial and industrial companies have, for over 30 years. ■ FULLY ACCREDITED TO OVER 350 EMC TEST METHODS. Put us to the test SM 795 Marconi Avenue • Ronkonkoma, NY 11779 TEL: (631) 737-1500 • FAX: (631) 737-1497 • www.retlif.com Additional Locations in New Hampshire, North Carolina, Pennsylvania & Washington D.C. 14 interference technology emc Directory & design guide 2011
CPI: Powering your world. TWTAs for EMC applications 1.0 -18.0 GHz up to 1000 W CW (10 kW available over select bands) 18.0-40.0 GHz up to 150 W (2.0 kW over select bands) 40.0 – 50.0 GHz up to 80 W Full Pulsed Amplifier Suites to 8 kW (megawatts pulsed power capability) Meet the new automotive and military EMC standards with CPI high-powered TWT amplifiers. EMC facilities worldwide depend on CPI amplifiers for superior performance, reliability, and quality. CPI has a proven track record of consistent performance, service, and support. For EMC testing, CPI is the only manufacturer of both the TWT and the amplifier, ensuring quality designs and smooth operation. CW and pulsed amplifiers are available from 1 to 95 GHz, with power levels exceeding 2 kW over selected frequencies. For more information please contact: Communications & Power Industries Canada,Inc. 45 River Drive, Georgetown, Ontario,Canada L7G 2J4 For Sales offices worldwide please e-mail: marketing@cmp.cpii.com Or look us up on the Web at: www.cpii.com/emc
Page 1: TM 2011 EMC Directory & Design Guid
Page 6: contents2011 Interference Technolog
Page 10: from the editor A look back — and
Page 14: testing & test equipment sions is a
Page 20 and 21: testing & test equipment Troublesho
Page 22 and 23: testing & test equipment Troublesho
Page 24: testing & test equipment Wir e l e
Page 27 and 28: Viol e t t e testing & test equipme
Page 29 and 30: Viol e t t e testing & test equipme
Page 32: testing & test equipment M e a s ur
Page 35 and 36: H o o l ih a n testing & test equip
Page 38 and 39: testing & test equipment O n t h e
Page 40 and 41: New Military Product Highlights IFI
Page 42: testing & test equipment O n t h e
Page 45 and 46: R o drigue z testing & test equipme
Page 47 and 48: R o drigue z testing & test equipme
Page 49 and 50: EMC EMI EMP EMR EMV ESD EMCON HERF
Page 51 and 52: R a da s k y testing & test equipme
Page 60: testing & test equipment N e w EMC
Page 63 and 64: B o r g s t r o m testing & test eq
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B o r g s t r o m testing & test eq
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B o r g s t r o m testing & test eq
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Facility Solutions Facility Solutio
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EMI/RFI Shielding Solutions Our ext
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JAVOR standards wire of our test se
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JAVOR Between 0 and d/2 along the r
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JAVOR is measured. Since the potent
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JAVOR standards Figure 7a. “Reali
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shielding / cables & connectors Num
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S c h o e m a n, Ja k o bu s shield
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adiated emissions G o ing from A n
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K e e bl e r, Berge r and identify
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K e e bl e r, Berge r radiated emis
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surge & transients A Risk A s s e s
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surge & transients A Risk A s s e s
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filters A c c ur at e F e e d t hr
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filters M e a s ur e m e n t s a b
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H o f f m a nn, Br aun, Frech, Rus
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design EMI Sources and Their Most S
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Cover_DDG10.indd 1 TM EMC Design ..
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standards recap HBM ESD parameters
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standards recap International Organ
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standards recap noise from power li
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standards recap quality on selected
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standards recap including to addres
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professional societies Every year,
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professional societies of TechAmeri
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professional societies education, s
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government emi/emc directory Mr. Ro
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government emi/emc directory Ms. Ja
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government emi/emc directory Chief:
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products & services index products
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products & services index Electrost
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products & services index Lightning
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products & services index York EMC
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company directory company directory
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company directory AR Tech Engineere
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company directory DARE!! Instrument
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company directory DNK Metric A/S...
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company directory Instruments For I
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company directory Metal Textiles Co
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company directory Protocol Data Sys
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company directory Spira Manufacturi
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company directory VPT, Inc. .......
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