Tip of the Month:
Always Look for the Laser Etching on the Sensor
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Sensors can easily be placed in the wrong boxes. When calibrating a sensor, always look for the laser etching on the sensor for the model number and serial number information. If the serial number cannot be read from the sensor, it should be sent back to the manufacturer for proper marking.
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Technical Exchanges
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August 3-6, 2015
Austin, TX
August 9-12, 2015
San Francisco, CA
Structural Measurements
August 12-14, 2015
Modal Analysis
August 17-19, 2015
Cincinnati, OH
By The Modal Shop, Inc.
August 13, 2015
Phoenix, AZ
August 30-September 4, 2015
Prague, Czech Republic
October 5-8
Orlando, FL
October 20-22, 2015
Novi, MI
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Quick Links
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ISO TC 108 - Mechanical vibration, shock and condition monitoring
ISO TC 108/SC 3 - Use and calibration of vibration and shock measuring instruments
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Previous Newsletters
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Small Arms Ammunition Manufacturer's Institute (SAAMI) Discusses High Pressure Sensors and Calibration; Microphone Calibration Part II
Calibration from the Risk Management Perspective; Microphone Calibration Part I
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Select Newsletter Articles
by Topic
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How Does Relative Motion Affect My Calibration?
By Patrick Timmons, Calibration Systems Engineer
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A frequent calibration question we receive here at The Modal Shop, Inc. is: "Should I bolt my shaker to a heavy table?" The difference in answer depends on which reference you are using with the shaker. For back-to-back calibration, we typically answer "no;" for optical encoder calibrations we typically answer "yes." The reason we require bolting a shaker with an encoder displacement reference to a table or large mass is reference motion, often called relative motion...
Click to read full article
modalshop.com/calibration.asp?ID=1060
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Accelerometer Frequency Range: A Tale of Two Specs
By Mike Dillon, Calibration Product Manager
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This article will take a slightly deeper look at this and explain the accelerometer design choices that affect this specification....
modalshop.com/calibration.asp?ID=1064
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Blast from the Past:
Why Proper Mounting is Essential to Calibration
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A calibration laboratory was having a hard time calibrating a particular accelerometer. The sensor's specification according to the manufacturer's website, indicated a sensitivity value of 100 mV/g (�10%) and a frequency response up to 6500 Hz (�10%). The initial calibration results at the reference frequency (100 Hz) were good and a sensitivity value of 99.97mV/g was measured, really close to the sensor's nominal sensitivity. Surprisingly enough, the sensor would repeatedly fail its frequency response calibration...
modalshop.com/calibration.asp?ID=800
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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!
Sincerely,
Michael J. Lally The Modal Shop, Inc.
A PCB Group Company |
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