| Tip of the
Month |
|
Cable
connection
As simple as it may sound, always remember to turn the floating
clamp on an accelerometer cable connector rather than turning the
sensor to screw on the cable. While it might feel more
comfortable spinning the larger sensor and holding the fixed cable
end, this causes the sensor connector to rotate about the cable
signal pin which can shear off fragments of the signal pin risking a
short circuit across to the connector
ground. |
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| Accelerometer
considerations for ESS, HALT & HASS |
|
 Environmental Stress
Screening (ESS), Highly Accelerated Life Testing (HALT)
and Highly Accelerated Stress Screening (HASS) each involve long
duration cycling in terms of vibration, often accompanied by cycled
temperatures and/or pressures. These extremes of vibration,
temperature and/or pressure, which are physically taxing and are
intended to prove, degrade or terminate the functioning of the
product or structure under test, can be just as taxing on the
monitor accelerometers providing feedback to the vibration
controller...
(http://www.modalshop.com/test_calibration.asp?ID=223)
|
| Relative motion in
calibration |
|
 In the back to
back calibration method, the known sensitivity of the reference
accelerometer combined with its measured output is used to determine
the acceleration level of the shaker. This information combined with
the measured output of the Sensor-Under-Test (SUT) is used to
determine the SUT sensitivity thus completing the calibration. The
obvious, yet sometimes overlooked assumption in this method is that
both sensors are subjected to the same acceleration input, bringing
up the topic of this month's column...
(http://www.modalshop.com/test_calibration.asp?ID=224) |
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| We appreciate your
interest and are glad to be providing you regular information to
help with 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.
Sincerely, |
|
Michael J. Lally The Modal Shop
A PCB Group Company
| |
