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Operation at Constant Displacement Level.
This
type of
operation can
be
achieved
by using
either
an
accelerometer or
a velocity
type pick-up
as
the
controlling element
of the
shaker
table
motion.
A c ce le rometer
Preamplifier
Velocit Generator
Acceleration Generator
Power
Amplifier
Fig. 7. Typical vibration test arrangement.
Level Range
With
Accelerometer
With Velocity Pick-up
10"
5-
500
c/s
5-
500
c/s
1"
5- 500 c/s
5-
500
c/s
o.1"
5-2ooo
c/s
5-2ooo
cis
o.01"
50-2ooo c/s
5-2ooo c/s
To set up the test
apply
the following
procedure:-
1.
Set
the knob marked
"Output
Voltage"
to
"0".
2. Calibrate the instrument as described under
"Calibration
of the Frequency
Scale",
page 15.
3. Adjust
the automatic frequency
scanning
arrangement,
page
16.
4.
Turn the knobs marked
"Displacement-Velocity
Level" and
"Acceleration
Level" to
"0".
5. Connect
the instrument as
shown
in Fig. 7.
6.
Set
"
Meter Switch" in position
"Vibration
Level"
.
7.
Set "Scanning
Speed
Multiplier"
to
"Off".
8.
Adjust
the regulation
speed
as follows:
-
(a)
If it is desired to automatically obtain the highest permissible re-
gulation speed as a
function of frequency the
"Compressor
Speed"
knob is
set
to "Auto". The
setting
of the
"Compressor
Function"
switch will
then depend upon the
specimen
Q
and the speed required
for the
frequency sweep
of the
oscillator.
17
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