26
METER FUNCTION
AVERAGING TIME
(front
panel)
AVERAGING
TIME
(rear panel)
"Linear"
"300
seconds"
"Remote"
3 .
Adjust
the
Band Pass Filter as described
in
section
3.3
.1/ 3
with
the
following
changes:
AVERAGING
CONTROL, Program
and
Min.
Time
switches
AVERAGING TIME
switch
(rear panel)
Select a program
to
suit
the
current
measuring
as-
signment.
See section 4 .2 .
2,
for
further
informa-
tion
"Variable"
4 .
Adjust
the
Level Recorder as described in section
3.3
.3/ 4
with
the
following
changes:
RECTIFIER RESPONSE
"DC"
LOWER LIMITING FREQUENCY
200
Hz
WRITING SPEED
"315
mm
/
second"
PAPER SPEED
"10
mm
/
second"
5.
Calibrate the
input
sensitivity
of
the
Recorder as described in section 3 .3 .3/ 5 and
6.
6 . Synchronize the paper
transport
according
to
the
method detailed
in
sections
3.3.3
/ 7 to 21 .
7. Reset
the
Level Recorder controls as
follows:
PAPER DRIVE FUNCTION
"Continuous
F"
PEN
DRIVE
"On"
8.
Apply
the
signal to be measured and analyzed
to
the
input
of
the
Measuring
Ampli-
fier
.
9.
Start
plotting
the frequency spectrogram by
pushing
the
right-hand
FILTER CON-
TROL MODE
switch
on the Filter
to
"Run"
.
The averaging
time
in
the
Measuring
Amplifier
is
automatically
switched
to
the
pro-
grammed
value
for
the frequency band being measured. The Level Recorder paper is
held
stationary
for
a period
of
five
times
the
selected averaging
time,
while
the
recti-
fier
is
then
switched
to
an
averaging
time
of
1 0 seconds (or longer) to hold
the
pen
deflection,
while
the Recorder starts and drives
forward
a distance
proportional
to
the
step size selected giving a
plot
of
the
level in
that
band. Then
the
Filter moves
on
to
the
next frequency band and
the
programmed
averaging
time
for
that
band is
selected
while
the
Recorder reverts
to
its hold
function
.
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