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

Welcome to Issue #48


With this issue, we celebrate our 4th full year of the Sensor & Calibration Tips Newsletter. We have been excited to bring you a host of tips and tricks for both dynamic sensing and calibration.  Please remember to check out our growing archive for any topics you missed along the way.  As always, we are here to serve you - so let us know if there are topics you would like to see covered in a future addition! 

Join Our Mailing List

View our profile on LinkedIn


 Follow us on Twitter

Find us on Facebook

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 #47 -

Accelerometer Mounting; Accelerometer Technologies and Performance Characteristics

sensor & cal tips #46  -

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

Select Newsletter Articles by Topic
PCB Group Companies

ED and Reference Limitations in Historical Low Frequency Calibration


Historically, the limiting factors in low frequency accelerometer calibration were a combination of the Low Frequency Calibrationlimited stroke length of electro-dynamic (ED) shakers providing limited acceleration levels at declining low frequencies, and the limited resolution of the piezoelectric reference accelerometer in the presence of the sensor's rising electric noise floor. By adopting and applying proven technologies in a novel combination, it is now possible for improved simplicity and reduced measurement uncertainties of dynamic vibration calibration at very low frequencies. The commercially available combination of a high accuracy optical displacement reference and ultra-long stroke (>250 mm stroke) calibration grade linear actuator has created a new standard in ultra-low frequency calibration.


Click here to read more

Multiple Component Order Tracking


The accessibility of ICP® compatible tachometers continues to grow with models available from a number of manufacturers.  Much like the MIMO shaker revolution that followed years of SIMO vibration testing, it is now more commonplace for sound and vibration users to have

Laser Tachaccess to anywhere from

four to a dozen tachometers on dynamic input channels.  The following paper, authored by Professor Jason Blough of Michigan Technological University, outlines some benefits of using multiple tachometers and advanced order tracking methods for solving certain types of vehicle noise and vibration problems.


Click here to read more

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 - "Calibration Uncertainties - Random vs Systemic"...


As we discussed in a previous article, there are two types of calibration uncertainties, random and

Uncertainty Reduxsystemic. Since a calibration lab is responsible for correctly reporting their uncertainty, it is important to understand the differences between these types of contributors and how each can be considered.


As a framework to differentiate the two types, consider that uncertainties caused by random contributors lend themselves to be determined by statistical measurement methods whereas, uncertainties that are systemic in nature need to be surveyed versus more accurate methods. As an example, in accelerometer calibration...


Click here to read more



We appreciate your interest and are glad to be providing regular information to help you with your dynamic testing and calibration needs.  



Mike Lally signature
20 Year StickerMichael J. Lally
The Modal Shop
A PCB Group Company