24
11 .
Put
the
chart
paper on the sprocket so
that
the
pen is
between
the
black squares de-
noting
the
centre frequencies of
the
first
filter
band to be scanned (the
lowest
fre-
quency
in the scan) and
the
adjacent
filter
band
with
a
lower
frequency.
If
the
sprocket position prevents accurate
alignment
(± 1 mm), use
the
following
adjust-
ments
.
12
. Rotate the AUTOMATIC STOP
wheel
with
respect to
the
PAPER ADJUSTMENT
wheel
the same
amount
that
the
paper is
out
of
alignment,
but
in
the
opposite
direc-
tion
(using the
white
spots as a reference).
13
. Rotate
the
PAPER
ADJUSTMENT
wheel
carefully
upwards
(back)
10
to
15
mm
(2
to
3 sprocket pitches).
14
. Push PAPER DRIVE
"Start"
button
and
let
the
paper
run
forwards
again to check
the
stop position.
15
. Repeat steps
12
,
13,
and
14
, making
further
adjustments
to
the
PAPER DRIVE
WHEEL
if
necessary
until
the paper
alignment
is correct.
16
.
Set
PAPER DRIVE FUNCTION on Level Recorder to
"Stop"
.
1 7. On Band Pass Filter change
settings
to:
SELECTIVITY
"1 1 3
oct"
FILTER CONTROL MODE
"Recorder"
18
. Push FILTER CONTROL MODE
right
-hand
switch
to
"Run"
,
on
Band Pass Filter.
19.
Rotate
the
FILTER
SHIFT SYNCHRONIZATION
wheel
on
the
Recorder
carefully
downwards,
while
watching
the
digital
display on
the
Band Pass Filter
until
it
changes
indicating a
filter
shift
point
.
Turn
the
wheel
a
further
distance
just
short
of
5
mm
downwards.
20
. Push
the
right-hand
FILTER
CONTROL MODE
switch
to
"Stop",
on
the
Band Pass Fil-
ter.
The paper position is
now
synchronized
with
the
filter
shift
position
for
charts
using
1 1
3-octave
steps.
21
. For
charts
using 11 1-octave steps
the
paper
must
be moved back
(into
the
Recorder)
1 sprocket tooth
pitch, so
that
the
pen rests
approximately
7,5
mm
before
the
centre
frequency
mark
for
the
first
(lowest
frequency)
filter
in
the
scan.
22.
Alter
the
Level Recorder control
settings
as
follows
:
PAPER DRIVE FUNCTION
PEN
DRIVE
PAPER SPEED
(always
in
mm
/ sec)
"Continuous
F"
"On"
As
applicable, select according to
the
chosen
start-
ing
frequency
and WRITING SPEED . See
point
26
below
and section 4 .3 .1.
23
.
Connect
the
signal to be analyzed, and
start
plotting
the
frequency
spectrogram by
pushing
the
right-hand
FILTER
CONTROL MODE
switch
on
the
Filter to
"Run".
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