TMS Square sensor & calibration tips                                          Your one-stop sound & vibration shop

Welcome to Issue #47


The team at The Modal Shop has been sending out this monthly training and tips newsletter for dynamic sensors for some time now!  If you are new to our newsletter, please enjoy this short communication, share it with a colleague and have a look at the archive links below where you'll find all the back issues with their wealth of information.  


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Tip of the Month

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
Previous Newsletter
sensor & cal tips #46  -

Handling Out-of-Calibration Equipment; How long should an accelerometer cable last?


High Frequency Accelerometer Measurements
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PCB Group Companies

Characterizing Accelerometer Mounting...


Triaxial AccelerometerWe often get asked the question, "How do I mount a triaxial accelerometer to calibrate the (in plane) X and Y axes, when there is only a single Z axis mounting hole?" Clearly the Z axis stud mount poses no problems, but questions follow such as, "Can I adhesively mount it on the cap or case?" or "Why can't I get my accelerometer to pass in the off axes direction?" Our answer is always the engineering favorite, "Well... it depends." Lets take a look at the problems in a little more detail...


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Blast from the Past


For those who may be new to our newsletter, we wanted to highlight an article from a previous sensor & calibration tips - "Accelerometer Technologies and Performance Characteristics"...


Recognize the early accelerometer design in the picture?  Commercialized in the 1920's originallyEarly accelerometer design 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's 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...


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More Information and Education


Summer time is the time we remind you that you can get volumes of free reference and training information from The Modal Shop. We are building our technical library every month, so if you have time, check out our "Video Vault", Modal Shop YouTube Channel or Newsletter Topic Archives, and please, take a quick peek at what you've been missing!


 Modal Shop Website "Video Vault"

Modal Shop YouTube Channel

sensors & calibration Application Topics Compiled

Training Courses with Dr. Walter


Dr. Pat Walter has previously taught sold-out courses on dynamic shock, vibration, pressure and force measurement theory and practice at PCB in Buffalo, NY. Click below for details and more information on upcoming courses.


Click here for upcoming courses  



We appreciate your interest and are glad to be providing regular information to help you with your dynamic testing and calibration needs.  If you have any questions you would like answered or have a topic you would like to see covered, please contact us and we'll be glad to help out.  Your question may even be featured in a future newsletter...



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20 Year StickerMichael J. Lally
The Modal Shop
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