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1.
Follow
instructions item 1 through 10 under
"Operation
at
Constant
Displacement Level", page 17.
2. Set "Function Selector"
to
"Auto".
3. Set
the Oscillator
frequency
dial pointer to the desired
cross-over
fre
-
quency.
4. Keep
the dial pointer in its
position,
i.
e. pointing exactly at
the desired
cross-over
frequency,
and
turn the outer knob on the tuning
capacitor
shaft,
until the lamp marked
"Accel." at
the top left on the instrument
front
panel just
cuts
in
(or
out).
5. Set
the frequency dial pointer to
a
frequency
just below
cross-over,
i.
e.
where
the "Accel.
"
lamp
cuts out.
6. Set
the "Acceleration
Range"
switch
to the proper
acceleration
range,
see
also
Fig.
8.
7.
Proceed
as
outlined under
"Operation at Constant
Displacement
Level",
item 12 through 15.
8.
Adjust the
"Output
Voltage" potentiometer until instrument meter pointer
shows
a
suitable
deflection,
for example
10 db
(lower
meter
scale).
9. Set
the frequency dial pointer to
a
frequency
just above
cross-over,
i.
e
where the "Accel." lamp
cuts
in.
10. Turn the knob marked "Acceleration Level" clockwise until the instru-
ment meter
pointer
deflects to the
same value as
in item 7
(10
db
on
lower meter
scale).
11. Re-adjust the
"Output Voltage" potentiometer so
that the maximum
oscillator voltage
required during
a complete
frequency
sweep is
10
V.
(The
scanning of
the desired frequency range
should
be
carried
out
manually
and very slowly).
12.
Set "Meter Switch"
to "Vibration
Level"
.
The
instrument
is
now ready for use
and
the
vibration
test
can
be started by
setting the "Scanning
Speed Multiplier" switch
to the desired
position
(X
0.1
"
or "X
1").
When the test is
over,
the instrumentation
should be
switched
off by first
turning
the
"Output Voltage" knob
to "0"
and
then disconnecting the power
amplifier,
the
Exciter Control and
the
DC power supply,
from the mains by
means
of
their
various
"On-Off"
switches.
21
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