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Welcome to issue #35-
Please have a look (like thousands of your industry colleagues do each month!), and share it with a co-worker.  We have more ways to stay connected and help serve your test and calibration needs.  Friend our Facebook fan page to keep up with conferences and see what the team at TMS is up to.  You can also follow the archive links below to where you'll find all the back issues with their wealth of information.
Accelerometer Temp Extremes
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Tip of the Month

For shock impulse calibrations, it is important to use pulse durations of moderate width - not too long or not too short.  For shock accelerometers, we target a pulse width of at least 100 microseconds to best stay within the useable bandwith of typical shock accelerometers.

Quick Links
ISO TC 108 - Mechanical vibration, shock and condition monitoring
ISO TC 108/SC 3 - Use and calibration of vibration and shock measuring instruments
NCSLi - Providence, RI (July 25-29)
Newsletter Archive by Topic
Newsletter Archive by Issue
Full Table of Contents - all the back issues
sensor & cal tips #32 - Piezoelectric Transduction; Do I really need to calibrate?
sensor & cal tips #33 - Forced ranking; The decline in quality
sensor & cal tips #34 - Measurements Matter; Fundamentals of Modal Analysis
PCB Group Companies

Accelerometer Technologies and Performance Characteristics

Early accelerometer design (circa 1920)
Early accelerometer design
Recognize the early accelerometer design in the picture?  Commercialized in the 1920's originally through Southwark (now BLH Electronics), it consisted of an E-shaped frame containing 20 to 55 carbon rings in a tension-compression Wheatstone half-bridge between the top and center section of the frame.  By 1936, Southwark a version with "adjustable cork damping" was available.  Reported applications were: "recording acceleration of an airplane catapult, passenger elevators, aircraft shock absorbers and to record vibrations of steam turbines, underground pipes and forces of explosions...".  Follow the link to review PCB Piezotronics Vice President of Engineering, David Lally's presentation from Sensors Expo in Chicago earlier this month.

Video tutorial on Accelerometer Calibration

Accelerometer CalibrationEmbracing the profileration of YouTube and videos on the web, this month we offer a short video presentation on accelerometer calibration.  The video describes the basic operation of our accelerometer calibration system.  Throughout the Summer, we'll be releasing more application training in video format so come back and check out The Modal Shop website often.
Click here to see the video
2010 celebrates our 20th Anniversary.  Become a fan of our Facebook page and see pictures of "Modal Shoppers" (and maybe some of your colleagues) from our past conferences, applications and celebrations.  As you'll see in the pictures, we're here to serve you with all your dynamic sensor and calibration needs.
Mike Lally signature
20 Year StickerMichael J. Lally
The Modal Shop
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