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The vibration meter
enables
easy
setting
and monitoring of the
vibration
level in terms of inches
(em), inches/sec.
(em/
sec.),
or G
*)
depending on
whether the displacement, the velocity, or the
acceleration
level is kept
constant
by the automatic level regulation.
The vibration level
can
be
controlled
in different ways:-
1.
The
displacement level
of the
shaker
table
can
be kept
constant,
inde-
pendent of frequency, or
2. The velocity
level
can
be kept
constant, or
3. The acceleration
level
can
be kept
constant,
or
4.
The displacement level can be kept
constant
below
a certain
pre-set
cross-over
frequency, above which the
acceleration
level is kept constant.
The desired type of operation is
chosen
by means of the
"Function Selector"
knob. Additionally it is possible to
control
the table motion
either
by means
of
a velocity type vibration pick-up
(signal generator coil), or
by means of
an accelerometer according
to the following table:-
Controlling
Element
Velocity
Gen.
Accel.
Gen.
Frequency range in which the
5-2ooo cps
shaker
displacement level can be
5-
2ooo
cps.
(50-2ooo cps
for level
kept
constant.
range
o.01 "
).
Frequency range in which the
shaker
velocity level
can
be kept
5-
2ooo cps
-
constant.
Frequency range in which the
shaker acceleration level can be
10-
2ooo cps.
10-10ooo
cps
kept
constant.
Frequency range in which auto-
10-500
cps.
10-500 cps
mafic
cross-over
is
possible.
The regulation
speed
of the regulating
amplifier
is
variable,
providing
regulation
speeds
of
10,
30,
100, 300,
1ooo
and
3ooo
db/sec.
This regulation
speed
is the
speed
with
which
a
sudden change
in the
operating conditions
of the shaker table is regulated back to "normal"
,
and is
chosen by
means
*)
G
=
981
em /sec!
=
32.2
ft
tsec
2
=
386 inch/sec
2
=
Acceleration of
gravity.
6
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