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Tip of the Month: Calibrating PR and VC Type Sensors
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When calibrating piezoresistive (PR) and variable capacitive (VC) type sensors, be sure to check the zero-measured offset (ZMO) value of the sensor.
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Technical Exchanges
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The Modal Shop, Inc.
10 am - 3 pm
March 3, 2015
Los Angeles/Torrance, CA
The Modal Shop, Inc.
10 am - 3 pm
March 5, 2015
San Jose, CA
The Modal Shop, Inc.
May 13, 2015
Cincinnati, OH
PCB Piezotronics - Dr. Pat Walter
May 19-21, 2015
Buffalo, NY
June 9-11, 2015
Long Beach, CA
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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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How to Calibrate Your 4-20mA Current Loop Vibration Sensors; The Science of Accelerometer and Sensor Mounting
How Do You Calibrate the Calibration System?;Eddy Current Probes Produce An Alarming Trend
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Select Newsletter Articles
by Topic
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How Do I Calibrate DC Response Accelerometers?
By Rick Bono, Co-President, The Modal Shop, Inc.
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 DC response accelerometers are vibration sensors capable of measuring a DC, or 0 Hz, response. The most common types of DC response accelerometers are based upon a variable resistive or capacitive design. Generally termed piezoresistive (PR) or variable capacitive (VC) within the measurement and instrumentation industry, these transducers cover a wide range of applications, from expensive precision transducers for military and defense applications, to very inexpensive MEMS transducers built on electronic component packages for smart phones and automobile airbag deployment sensors...
modalshop.com/calibration.asp?ID=1038
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How Does Shaker Design Affect Transverse Motion? Also, How Does Transverse Motion Affect Accelerometer Calibration Results?
By Mike Dillon, Calibration Product Group Manager, The Modal Shop, Inc.
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 There are two basic designs of calibration shakers: flexure-based shakers and air-bearing shakers. The names reflect the way in which the vibrating element is suspended. This difference in design also directly affects the transverse (commonly, the horizontal) motion of the vibrating element. In flexure shakers, the motion of the vibrating element is modeled very well by a classic second order system. In this model, the vibrating element acts as the mass and the flexure suspension acts as the spring. The suspension acts not only in the axial direction but also in the transverse direction. Since the transverse stiffness is not infinite, the system has a resonance in the transverse direction, and the transverse motion at this frequency causes...
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Blast from the Past:
Vibration Measurement at High Temperatures
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"What do I have to do to measure vibration at high  temperature?" is a common question for the extreme environments found in the automotive, aerospace and industrial vibration measurement fields. Various sensor considerations come into play including sensing element material, casing/connector construction, signal conditioning and cabling. Since there is no single right answer to this question, as you might imagine, the answer depends on just how high the temperature is ...
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Thanks for joining us for another issue of "Dynamic Sensors & Calibration Tips." As always, please 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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