Answers to IEC 61000-4-3 Test Standards Changes

The IEC 61000-4-3 has long been accepted as the basic standard for testing to radiated, electromagnetic field immunity testing in order to satisfy many European Union requirements for the CE mark. Recent changes in IEC 61000-4-3 Edition 3.0 include a new harmonic distortion requirement, new linearity check, an extended frequency range, and new test table material requirements. Some common test problems have been brought to light that may require EMC test labs to upgrade and/or purchase new equipment, which has many test labs wondering what features to look for in new equipment.

AR Worldwide RF/Microwave Instrumentation has written an application note explaining the changes – and the implications those changes have on test equipment. The paper offers a number of helpful tips that labs should try before purchasing new amplifiers.

To download the report, Application Note #41, visit here.

Tech-Etch Photo Etching Brochure

This brochure describes how photo etching allows Tech-Etch to produce intricate parts for many diverse mechanical and electrical applications. Custom light-gauge parts are produced with intricate patterns, precise tolerances and burr-free edges, in addition to exact repeatibility.

The brochure contains photographs of more than 100 precision parts. Applications include encoders, masks, filters, lead frames, flat springs, strain gauges, laminations, step covers, heat sinks, shields, electron grids, shims, implants, blades, stents, cathodes and fuel cell plates. Metals such as beryllium copper, stainless steel, aluminum alloys, titanium, tungsten, nitinol, molybdenum, brass and spring steels as well as polyimide film can be etched.

Also featured is Tech-Etch’s ability to produce tight-tolerance photo-etched screens with tapered or straight holes, custom board level shielding, and flexible circuits using both adhesive-based and adhesiveless raw materials.

Tech-Etch, Inc., ISO 9001:2000, AS9100:2004 Rev B registered, manufactures precision parts, flexible circuits and is a global leader for standard and custom EMI/RFI shielding products. Visit www.tech-etch.com or call (508)747-0200 for a copy of the brochure.

A Different Filter Design Book

Practical Analog and Digital Filter Design by Les Thede, claims to be different from other filter design books in two important ways.

First, the most common analog and digital filter design and implementation methods are covered. All important derivations and descriptions are provided so that readers can apply them directly to their own design problem. Over 40 examples illustrate the fundamentals. Second, the text is accompanied by WFilter, a fully functional Windows®-based filter design package and its course code.
The 278 pages include normalized transfer functions; for the Butterworth, Chebyshev and elliptic approximation cases; converting a normalized low pass filter to an unnormalized low pass, high pass, bandpass or bandstop filter; analog, discrete-time and digital filter design; and IIR, FIR and Fourier transform.

The book costs $99 from Artech House, 685 Canton St., Norwood, MA 02062, (718) 769-9740, ext. 4030.