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SECTION 8- SPECIFICATIONS
The performance specifications for OMEGA accelerometers are very
well defined and listed in this section. Refer to the appropriate sales
bulletin and the calibration certificate which is
supplied with each
accelerometer product for more information
.
BASIC SENSITIVITY
OMEGA's low impedance accelerometers are standardized Into two major
output sensitivity groups: 10mV/g and 100mV/g. The basic sensitivity
specification represents the output of the accelerometer as measured at
100 Hz. Of course, the basic sensitivity varies from one unit to the next
within fixed limits
.
This limit is usually specified at ±5%.
A ±5% specification on this basic sensitivity means that a particular
100mVIg unit may be manufactured with a sensitivity which is actually
between 95mV/g and 105mV/g. The actual sensitivity for each unit is
verified at 100 Hz and recorded on the accelerometer
'
s calibration
certificate.
BASIC FREQUENCY RESPONSE
The frequency response specification for an accelerometer Indicates how
much the actual sensitivity may vary over the useable frequency range.
Typically this frequency response specification is stated to be ±5% over a
specified frequency range. Figure 8·1 depicts a typical wide band
frequency response for an accelerometer. The useable frequency range
within a ±5% frequency response specification is indicated by the
frequencies between points A and B.
This frequency response specification should not be confused with the
basic sensitivity specification.
Example: If a unit has an actual sensitivity of 95mVIg at 100Hz and a
frequency response specification of ±5% the actual sensitivity at a
frequency within the operating frequency range may be as high as
100mV/g or as low as 90mV/g
.
Figure 8-1.Typical Frequency Response Plot
