Welcome to Issue #69 


Greetings from the road. This month's issue comes to you from the Pacific Rim corner of the world.  I have been fortunate to have visited the countries of Japan, Korea, China and Singapore last week...and I am pleased to report that their economies continue to grow. The automotive market in this corner of the world is as strong as ever, and vibration sensing is playing a part in making cars smoother, quieter, more efficient and reliable. Here at TMS and PCB Group, we want your vibration sensing experience to be smooth, efficient and reliable, too. Read on for this month's bit of education and information. 

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Tip of the Month: 

Implement Operation Practices Within Standards 

Understand how implementing operation practices within the framework of technical and quality standards can help your organization. ISO 9001, ISO 17025 and ISO 16063 can all be important pillars of quality operation of vibration, testing and monitoring.

Technical Exchanges
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
ISO TC 108/SC 6 - Vibration and shock generating systems
SAVE (Formerly SAVIAC)
Previous Newsletters
How Low Can Your DVM Go?; Non-Contact Displacement Sensor Calibration


NIST to Reaffirm Vibration Calibration; Low Frequency Calibration Needs Support Standard ISO 8041:2005
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PCB Group Companies
Accelerometer Calibration -"Trust But Verify"
This month's travels have brought team members from accelerometer calibration training in Seoul, Korea The Modal Shop to visit Korea Testing Laboratory outside of Seoul, Korea. In speaking with Mr. Jae Taek Moon, Principle Engineer of the Machinery and Mechanical Standard Center, he shared with us that the discipline of calibration is very strong in the Korean culture. This reminds me of the old saying, "Trust But Verify," and is an extremely good axiom to remember with dynamic calibration. It is a good policy to have a number of layers of verification integral to both the calibration system and the operation process...

Upcoming NIST Colloquium

From Artefacts to Atoms Book by Terry Quinn Terry Quinn, Emeritus Director, Bureau International des Poids et Mesures will speak in a NIST colloquium this July 11th on his book "From Artefacts to Atoms: The BIPM (Bureau of Weights and Measures) and the Search for the Ultimate Measurements Standards."  


In this lecture, Dr. Quinn will outline the origins of the Metre Convention, the creation of the BIPM (and its development since 1875), as well as the parallel move from units of measurement based on material artefacts to those units based on the constants of nature.


He will end with a description of a simple device made from Lego blocks and a loudspeaker that demonstrates the principles of the watt balance, one of the ways of realizing the future definition of the kilogram based on a fixed numerical value for the Planck constant.  

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Blast From The Past: 
Improving Your Accelerometer Calibration Reference Measurement at Low Frequencies

Accelerometer users in the structural testing field often ask about how to calibrate a sensor's performance at the low end of the frequency response curve.  Since most manufacturers start the standard factory calibration at 10 Hz, there is typically no data delivered with an accelerometer documenting its low frequency performance.  To measure this data, a supplemental low frequency calibration must be performed...  

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Thanks for joining us for another issue of "Dynamic Sensors & Calibration Tips." As always, please, speak up and let us know what you like. We appreciate all feedback: positive, critical or otherwise. Take care!




Mike Lally signature
Michael J. Lally
The Modal Shop
A PCB Group Company