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Issue 120, November 2017
Have you ever been interested in joining a team committed to calibration excellence? The Modal Shop has a business development opening in our Calibration Group. If you're interested, please email us to learn more ...
Ground Vibration Testing
From Aerospace Testing International

All vibration testing applications have slightly different goals and constraints and thousands of different sensors are available. In this article, learn how ICP® accelerometers help address specific technical needs when performing a ground vibration test...

Tip of the Month
Rather than simply comparing results of the most recent calibration to the sensor's specification sheet, consider evaluating trend data over time for the same asset. Trend data can indicate that the sensor is stable over time, which can be overlooked when only the most current calibration is compared against the manufacturer's specification. For example, if an accelerometer with a 100 mV/g nominal sensitivity and ±5% sensitivity tolerance passes calibration at 104 mV/g one year and 96 mV/g the next, additional action may be recommended. An approximately 8% shift in sensitivity is well outside typical laboratory calibration system uncertainties; removing the sensor from circulation and investigation of any special/extraordinary causes of this shift would likely be of interest.



Blast from the Past
Transfer Standard Reference Accelerometers: Double vs Single Ended

Several vibration calibration methodologies are commonly used. Primary accelerometer calibration utilizes a laser interferometer as a reference per ISO 16063 Part 11 (1999). More common, however, is the use of another accelerometer called a transfer standard per ISO 16063 Part 21 (2003) to calibrate the accelerometer under test and provide traceability to a primary standard. Double and Single Ended transfer standard accelerometer designs are discussed below.


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Thanks for joining us for another issue of Dynamic Sensors & Calibration Tips.
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Sincerely,
Aaron Goosman -  Mike Dillon - Patrick Timmons - Shannon Henize

Calibration Team
The Modal Shop
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