| Tip of the
Month |
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Importance of cable
strain relief when calibrating...
A cable with proper
strain relief is especially important when calibrating sensors
at low frequencies. At low frequencies, improperly attached
cables can exert significant forces on the test sensor or even
affect the electrical output of the sensor. This can be easily
remedied by using a little bit of putty to attach the cable to
the side of the shaker. The cable should be attached loose
enough so that the shaker armature can still move freely, but tight
enough that an excessive amount of cable does not vibrate with the
test accelerometer.
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| Newsletter
Archive |
May 2007 - Basics of Accelerometer Function; How Standards Link Together
June
2007 - Shear, Compression, Flexure; ISO
16063 Overview
July
2007 - Accelerometer Transduction Types (PE,
PR, VC); Laser Primary Calibration
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| Behavior of
Accelerometers... |
...ideal, real world and
what's the difference.
 Ever
heard the old saying, "No one believes the results
of a theoretical analysis except the analyst. And everyone believes
the results of an experiment, except the
experimentalist"?
In the test and measurement world this applies to the
fact that vibration sensors are structures just like cars,
computers, satellites and machinery that they are used to
test. This means that accelerometers undergo stress and show
strain, they move, bend, deflect and often show signs of their real
world behavior. Test engineers and technicians need to
understand the real world behavior of their measurement equipment to
ensure that both valid data and valid results are
produced.
Click here to learn more
about ideal versus real world considerations in the behavior of
accelerometers.
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| Primary versus
Transfer Calibration... |
| ...what it means and which is right for
you
 The question often
asked is, "When (or even why) do I need primary
calibrations?"
Metrologists are also curious to know,
"What does it cost?"
The short answer to "who needs it?", is that primary calibration is the
standardized means to obtain the absolute minimum in
uncertainty. But to fully answer this question, one needs to
first consider the reasons for calibration. This month's
discussion answers the question from the angle of uncertainties,
costs and throughput
rates.
Click here for the
answers to "who needs it?" and "how much does it cost?"...
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| As always, your
satisfaction is at the pinnacle of our work. If you have questions you
would like answered, please contact us and we'll be glad to help
out. Your question may
even be featured in a future month...
Sincerely, |
|
Michael J. Lally The Modal Shop
A PCB Group Company | |
