MANUAL: 55308
REV: A
ECO: 49582
14
Figure 5.
Stud Mounting
Understand Back-to-Back Calibration limitations.
Do not expect the uncertainty of calibration to be
any better than
2%. (In fact, the uncertainty may
be as high as
3% or
4% for frequencies <10 Hz
or >2 kHz.) Since large sensors may affect high-
frequency accuracy, verify that the test sensor does
not mass load the reference standard. Validate
your calibration system with another accelerometer
prior to each calibration session. Check with the
manufacturer for exact system specifications.
7.5 CONCLUSIONS
Without an adequate understanding of dynamics,
determining what, when, and how to test a sensor is
a difficult task. Therefore, each user must weigh the
cost, time, and risk associated with self-calibration
versus the services of an accredited laboratory.
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