3.3. CROSS-MOTION
If an Exciter
is
to
be used for
accelerometer
calibration, it
is
important
that
its motion be as rectilinear as possible,
to
avoid adding any
error
to
the
calibration. The cross-motion of
the
Type
4809
is
very low, as
can
be seen
in
Fig.3.3, where cross-motion, expressed as a percentage
of
the
axial
motion,
is
plotted against frequency
for
an acceleration
level
of
50
g RMS.
Except for a few isolated peaks,
the
cross-motion
is
well below
1%
throughout
the frequency range
of
the
Type
4809.
13
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