By Kenneth Wyatt, Wyatt Technical Services LLCMore of my clients are starting to use small third-party DC-DC converters to provide the multitude of voltages required for today’s processor and DDR RAM ICs. While these are convenient to drop onto a circuit board, they can be quite a source of radiated and conducted emissions – especially those that switch in the MHz range.I … [Read more...]
CISPR 35 – How does it compare with CISPR 24?
After 15 years of work in CISPR Subcommittee I, the IEC Central Office published CISPR 35 Edition 1.0 on Tuesday, August 16, 2016. The IEC webstore link is https://webstore.iec.ch/publication/25667. In the US, ANSI has the standard available on their website as well. Go to www.ansi.org and type in CISPR 35 in the search window for standards. You must purchase a copy of the … [Read more...]
EMC & Its Role In Reliability
EMC and Its Role In Reliabilityby Ken Javor, EMC ComplianceTotally anecdotal, but this just happened to me.My wife uses a powered wheelchair. A very high end, high quality chair. We were on vacation driving north and had just crossed the 45th parallel in the state of Michigan. The 45th parallel anywhere is halfway between the equator and the North Pole. In Michigan it’s also … [Read more...]
Britain after Brexit, with the accent on EMC
Editor's Note (Updated June 27, 2016): Britain has voted to leave the European Union, a monumental decision that’s triggering some serious alarm bells throughout the country. As it stands, many UK laws and regulations are determined by EU legislation and it’s not immediately clear what the EMC standards ramifications in Britain will be during the two year … [Read more...]
Our Top Five Articles
Hi Everyone! I wanted to introduce myself as the new senior technical editor for Interference Technology. I spent the early part of my career in the aerospace industry as a design engineer and the last 20+ years as an EMC engineer, test center manager, and EMC lead for Hewlett-Packard and later the spin-off, Agilent Technologies. In 2008, I “retired myself” early and started a … [Read more...]
Troubleshooting EMI Seminar with Lee Hill: Interview
By Senior Technical Editor, Kenneth Wyatt. This interview was conducted on Dec 9th, 2015 in anticipation of the upcoming Troubleshooting EMI with Lee Hill: Identify, Characterize, and Prevent Interference Problems Seminar Tour hosted by Rohde & Schwarz and Interference Technology. The tour is running from March 10-24, 2016 in five different cities - Austin, TX; Irvine, CA; … [Read more...]
The Simplified Method and the Near-Field Catastrophe
The simplified method, and in particular the system base-RF-power determination used in the simplified method equation, only applies to far-field data. Why? Well, as an example, the radiation polar-plot provided by antenna suppliers is far-field data and in no way represents how the field-strength varies with angle close to the antenna.So where exactly is the near-field / … [Read more...]
Incorporating Antenna VSWR Loss into the Simplified Method
The Simplified Method of Establishing the RF Power Required by a RF Immunity System Continued...Previously we presented the novel idea that the RF power required by a RF immunity system is a base RF power level (determined entirely by constants), minus the gain of the antenna. The basic principle is shown pictorially in Figure 1. The picture says the system RF power requirement … [Read more...]
Use of Commercial Items
The use of commercial items (CI) or commercial-off-the-shelf (COTS) equipment presents a dilemma between imposing military E3 standards and the desire to take advantage of existing commercial systems, and accept the risk of unknown or undesirable electromagnetic interference (EMI) characteristics. Regardless of the pros or cons of using COTS, any procured equipment should meet … [Read more...]
Beamwidth Loss and Why Test Staff and dB Notation should be Friends
Please Note: - This blog entry continues the thinking behind the creation of the AH Systems webinar on selecting antennas for today’s test requirements. Supporting notes on the webinar can be found on the AH Systems website.(Hint - click the ‘Tech Notes’ Tab and simply select the first document listed on the main page itself).In the last entry we introduced a method that … [Read more...]
- « Previous Page
- 1
- …
- 14
- 15
- 16
- 17
- 18
- …
- 26
- Next Page »