| Tip of the
Month |
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Impacts from
instrumented hammers, particularly when using the hard steel tips,
can cause extremely high g levels of impulse response.
Therefore, whenever performing impact hammer calibrations, make
certain that the reference accelerometer data does not saturate,
truncating the measuring impulse function and significantly altering
the calibration results. |
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Instrumented
Impact Hammer Calibration |
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 Instrumented
impact hammers are a useful and common tool in the structural
dynamics and vibration field trouble shooting fields of
technology. The hammers, available in sizes from as small
as a 0.10 oz (2.9 gm) pencil up to 12 lb (5.44 kg) sledges, are
typically configured for a given test by adding an impact tip of
specific hardness (soft rubber to nylon to hard steel) and
occasionally a mass extender to add additional inertia for
broadening the impact energy pulse in low frequency
situations. Due to the unique nature of impact measurements,
it is advised by manufacturers that users should calibrate the
hammers in the tip/extender configuration in which they will be
used. For this reason, it is common to calibrate impact
hammers for each combination of different tips and
extenders.
http://www.modalshop.com/calibration.asp?ID=310 |
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Vibration
measurement at high temperature |
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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 ...
http://www.modalshop.com/calibration.asp?ID=311 |
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We hope
that you've enjoyed our newsletter again this month and its
educational content over the last few years. No where like the
calibration field is certainty and reliability more important. We've
been around for 20 years and we're part of the PCB Group which
is going on 45 years. We're here to serve you with all your
dynamic sensor and calibration needs... whenever you need
help!
Sincerely, |
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Michael J. Lally The Modal Shop
A PCB Group Company
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