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"Acceleration Level"
potentiometer controls
the
acceleration
level
of
the
vibration exciter
in
conjunction with
the "Function
Selector" and
the
"Acceleration
Range"
switches.
The level
can
be
read off
the instrument
meter when the
"Meter Switch"
is in
position
"Vibration
Level".
"Displacement-Velocity Level" potentiometer
controls
the displacement level
or
the
velocity
level of the
vibration exciter,
the type of
control
being
dependent upon the positions of the
"Function Selector" and
"Displacement
-
Velocity Range"
switches.
With the
"Meter Switch"
in position
"Vibration
Level" the
actual vibration
level
can
be read
off
the instrument meter.
"Acceleration Range"
switch
allows the
selection of
a number
of acceleration
level ranges which can be
controlled
by the Automatic
Exciter Control.
I!
also selects
what type of feedback
signal should
be used
for
the
control
,
i.
e.
whether the feedback
control signal consists
of the
output from
an
accelerometer, or
the output from
a velocity
type
pick-up, such as
the
signal generator coil.
The markings
on
the left-hand
side of
the
switch are valid,
if
a velocity
generator
is used
as
the
controlling element, while the
markings
on
the
right-hand
side are valid
for
accelerometer control.
"Displacement
-
Velocity Range"
switch
has two
functions,
depending upoll
the position
of
the
"Function
Selector":-
1.
With the
"
Function
Selector" switch
in
posiHon Displ.
the displacement
level of the
shaker
table is
controlled.
The
control signal can consist of
the output
from a velocity generator (sigm\.1 generator coil), or
the
output
from
an accelerometer. The
markings on
the
left-hand
side of
the Switch
are valid
for
velocity generator
control,
while
the markings
on
the right-hand
side are valid
for
accelerometer control.
2.
With the
"Function Selector" switch
in position "Vel." the
velocity
level of the
shaker
table is
controlled. Velocity
level
control can only
be
obtained
by means
of a velocity
type
feedback signal,
consequently,
only the left-hand
side
markings
can
be used. However, the markings
are valid for
displacement
control, and to
read
the
velocity
level
directly,
they
should
be multiplied
by
10.
"Function
Selector"
switch selects
the
type of regulation which
the
instru-
ment will perform.
With the
switch
in position
"Vel."
the
velocity
level
of
the
vibration exciter
is
controlled. This
type of regulation
can
take place
only.
when
the
output
from a
velocity
type pick-up is fed to the
"Vel
Gen.
Input" terminal
on
the rear of the instrument.
When the
switch
is in position
"Displ."
the displacement level
of
the
vibration exciter
is
controlled, and
in position
"Accel."
the
acceleration
11
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