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BRUEL & KJAER 1623 - Synchronisation with Recorders; Synchronisation with the Portable Level Recorders Types 2306 and 2309

BRUEL & KJAER 1623
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2.
With
the
TRACKING MODE
Manual
pushbutton
depressed
tune
the
filter
by
setting
the
MANUAL
TUNING/PRESET
switch
to
2Hz
to
200Hz
and
selecting
the
required
starting
frequency
by a
means
of
the
MANUAL
TUNING knob.
3.
Slowly
sweep
upwards
in
frequency
to
the
limit
of
the
knob ("'
300Hz)
and
note
the
actual
frequency
at
this
limit.
4 . Press
in
the
RECORDER SYNC.
Start
pushbutton
which
locks
the
synchronisation
signal
to
the
recorder. (Valid
for
1623
serial
numbers
higher
than
597890
.)
5.
While
holding
this
pushbutton
depressed move
the
MANUAL
TUNING/PRESET
slide
switch
up to
the
200Hz
to
20kHz
position
and
with
the
MANUAL
TUNING knob
se-
lect
the
limit
frequency
(or a
lower
frequency)
which
was
noted
in step 3.
6 .
Release
the
RECORDER SYNC.
pushbutton
and
continue
the
frequency
sweep
up
-
wards
as desired.
Note
that
when
20kHz
has been exceeded,
the
FREQUENCY
(out
of
range)
lamp
will
light
which
automatically
blocks
further
synchronisation
signals
to
the
recorder, i.e.
it
stops
the
paper (pen) drive at
20kHz.
Turning
the
MANUAL
TUNING/PRESET
knob
back
to
20kHz
will
allow
the RECORDER SYNC.
pushbuttons
to
reset
the
1
623
and
the
recording
paper (pen).
An
alternative
method
of
avoiding
problems
with
the
two
manually
tuned
frequency
ranges
overlapping
is
to
perform
the
manually
tuned
frequency
analysis
with
the
RECOR-
DER SYNC. slide
switch
in
the
Forward Only
position.
When
the
end
of
the
2Hz
to
200Hz
range
is reached
("'300Hz)
the
MANUAL
TUNING/PRESET knob is
turned
back
to
"' 2 Hz,
the
adjacent slide
switch
is moved
to
200Hz
to
20kHz
and
the
manual
sweep
is
then
continued
. The paper (pen)
synchronisation
will
automatically
be engaged
when
the
low
range
finishing
frequency
is reached ("'
300Hz).
4.5.
SYNCHRONISATION
WITH
RECORDERS
It
will
normally
be desired to
plot
out
a signal level as a
function
of
the
filter's
tuned
fre-
quency
. The
1623
is provided
with
both a
pulse
output
for
use
with
the
battery
operated
Level Recorders Types
2306
and
2309
and
also
a
DC
ramp
voltage
for
controlling
one
of
the
axes
of
an X-Y recorder.
Both
outputs
are
proportional
to
the
log.
of
the
tuned
fre-
quency
.
4.5.1.
Synchronisation
with
the Portable
level
Recorders Types
2306
and
2309
For
2306s
NOT
modified
to
run
in
both
the
backward
and
forward
directions
20
1.
Connect
the
1623
and
the
2306
into
the
instrumentation
chain
as
required.
Fre-
quency
calibrated paper QP
0124,
QP
0143
or
QP
0120
for
the
2306
will
be
conve-
nient
for
most
applications.
2 .
Connect
the
RECORDER SYNC. socket
on
the
rear
panel
of
the
1623
to
the
REM-
OTE CONTROL socket on
the
Level Recorder Type
2306.
For
2306s
with
serial nos.
lower
than
71
8058
the REMOTE CONTROL socket is 7
pin
and cable
AQ
0182
should
be used. For
instruments
with
higher
serial nos.
the
REMOTE CONTROL
socket is 8
pin
and cable
AQ
0034
should
be used.
Alternatively
cables can be
made
according
to
Fig.4.5
.
3 .
Set
the
rear panel RECORDER SYNC. slide
switch
to
the
Fwd. Only
position.

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