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Fun Link of the Month:
Paper Sizes Explained
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Have you ever wondered why paper sizes are the way they are? As Matt Parker explains, the A4 paper scale is based on a meter and one meter is exactly one forty millionth of the circumference of the earth.
Watch the video for the full explanation.
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Technical Exchanges
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August 4-7
Austin, TX
August 13-15
Cincinnati, OH
August 18-20
Cincinnati, OH
By Dr. Pat Walter, Professor, Texas Christian University
August 19-20
El Segundo, CA
September 8-10
Ft. Lauderdale, FL
September 15-17
Leuven, Belgium
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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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Guidelines Within Standards...Thou Shall or Thou Should Think...?
New Calibration Units for Digital Accelerometers
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Select Newsletter Articles
by Topic
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Uncertain About Uncertainty? Certainly!
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 In last month's issue, we talked about the responsibility of a laboratory to "make sure that the reported values of expanded uncertainty are credible." This month we intend to answer the resulting questions: why and how?
Why does understanding the uncertainty of a measurement matter? A particularly egregious example would be filling up your 15-gallon gasoline tank with the meter (and subsequently the price) reading 42 gallons. This example would be sure to catch the attention (and incite the anger of) the consumer quickly. However, in other more critical situations, such as ensuring the shutdown of a nuclear reactor during a seismic event, vibration measurement levels need not only report values close to the actual physical event, but the uncertainty of vibration measurement should be known...
modalshop.com/calibration.asp?ID=990
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How To Calibrate Awkwardly-Shaped Accelerometers
By Marco Peres, Product Manager
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 Proper mounting techniques are essential to calibrate all accelerometers. The mounted resonance of a vibration sensor directly affects the practical upper limit of the flat frequency response of that sensor. Cleanliness; surface finish and flatness; the light use of a coupling fluid (like silicone grease) between the accelerometer base and the mounting surface; and the right amount of torque (if stud mounted) as recommended by the sensor manufacturer; these all play a significant role when calibrating an accelerometer as we covered in a previous newsletter article entitled, "Why Proper Mounting is Essential to Calibration."The good news for metrology is that most accelerometer designs are built symmetrical to allow...
modalshop.com/calibration.asp?ID=981
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Blast from the Past:
Calibrating the Calibration System
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 Control, confidence and low uncertainties are the hallmark characteristics of a quality metrology laboratory. The basis for this operation is quality calibration equipment, sensor specific operator knowledge, as well as solid business and calibration processes. One vital key in this type of operation is maintaining proper control and calibration of the calibration system. In general there are three reference calibration paths a laboratory can choose which provide various trade-offs during downtime, cost and risk...
modalshop.com/calibration.asp?ID=461
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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 A PCB Group Company |
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