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Acceleration
0 dB
Velocity
Displacement
Fig.4.7.a
Fig.4.7.b
Fig.4.7.c
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200
Acceleration v. Frequency
Velocity v. Frequency
Displacement v. Frequency
a)
Frequency (Hz)
Frequency
c)
Frequency
f7102f
displacement fall-off slope of a typical shaker system and includes a margin
of safety. Below 1 Hz, and above the constant displacement region the gain
is suppressed to give good noise rejection. The DISPLACEMENT LIMIT
control adjusts the overall gain level of the displacement sensing character-
istic, high gain corresponding to low displacement limits. The circuit pro-
vides protection for both positive and negative displacement peaks.
However, the sensing circuit is AC coupled and thus takes no account of
any DC centring current flowing. For a heavy specimen the DC current is
38
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