| Tip of the
Month |
|
Removing
adhesive mount sensors with acetone
Cyanoacrylate adhesive (superglue) is often used for
bonding accels, in both calibration and testing applications. When
it is time to remove the accelerometer, apply some acetone
(fingernail polish remover) prior to breaking the bond. It
softens the adhesive, significantly
reducing the mechanical shock from "snapping" the accelerometer free
and aids in cleaning up the adhesive's residue. Keeping a residue free mounting surface will
ensure the best possible frequency response from your accelerometers
on the next
job. |
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| Facts about
Triax |
 By far, the most
popular configuration of piezoelectric accelerometers for
large/multichannel users is the integral triaxial
accelerometer. The
implementation of a single 4 pin sensor signal connector allows for
a common ground and overall 3 to 1 reduction in cabling. While on the surface, this
may seem trivial, consider that many typical users are now in the
hundreds of channels for standard vibration tests in the automotive
and aerospace industries.
This is also relevant to the consumer appliance/durables
market space where sound and vibration quality has stepped to the
forefront of marketability and customer
preferences.
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| Uncertainty
Redux |
 As we
discussed in the previous article, there are two types of
calibration uncertainties, random and systemic. Since a calibration
lab is responsible for correctly reporting their uncertainty,
it is important to understand the differences between these
types of contributors and how each can be
considered.
As a framework to differentiate the two types, consider that
uncertainties caused by random contributors lend themselves to be
determined by statistical measurement methods whereas, uncertainties
that are systemic in nature need to be surveyed versus more accurate
methods. As an example, in accelerometer
calibration...
(http://www.modalshop.com/test_calibration.asp?ID=215) |
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| We appreciate your
interest and are glad to be providing regular information to help
you in your dynamic testing and calibration needs. If you have
any questions you would like answered or have a topic you would like
to see covered, please contact us and we'll be glad to help
out. Your question may even be featured in a future
newsletter...
Sincerely, |
|
Michael J. Lally The Modal Shop
A PCB Group Company | |
