3.2.2.
Calibration
MANUAL
FILTER SELECTOR
POWER ON
Set
to
the
frequency
band
(if
any) in
which
the
measurement
is
to
be taken
"
On"
The positions
of
all
other
controls
is
immaterial.
6.
Apply
the
input
that
is
to
be analyzed.
7.
Adjust
the
INPUT SECTION
ATIENUATOR
until
a reading can be obtained
from
the
meter, preferably at the upper end
of
the
scale.
If
the
INPUT OVERLOAD
LAMP
lights
before a reading is obtained.
adjust
the
OUTPUT SECTION
ATIENUATOR
to
ob-
tain
a reading on
the
scale.
8. The signal level
within
the
selected
frequency
band is read by
"adding"
the
INPUT
and OUTPUT SECTION
ATIENUATOR
positions and
the
meter
reading. This is de-
scribed in
the
Measuring
Amplifier
Instruction
Manual
under
Operation.
9. Use
the
MANUAL
FILTER SELECTOR
to
select
other
frequency
bands
for
measure-
ment
in
the
same
way
.
The
measuring
arrangement
can be calibrated
either
with
reference to
the
measuring
transducer,
or
as
a voltage analyzer. For
calibration
ei
ther
way,
refer
to
the
Instruction
Manual
for
the
Measuring
Ampl
i
fier
.
3.3.
OPERATION
WITH
MEASURING
AMPLIFIER
AND
LEVEL RECORDER--
Both Type
2306
and Type
2307
Level Recorders can be employed to
plot
a
permanent
record
of
the
frequency
spectrum
, using a
directly
synchronized mode,
with
filter
switch
-
ing
controlled
by
the
Recorder (valid also
for
the
earlier
Type
2305)
. The Type
2307
is
particularly
useful
as
it
has a
better
range
of
signal averaging,
which
is an advantage
when
low
frequencies
have to be measured
with
the
Measuring
Amplifiers
Type
2606
and Type
2608
. For a discussion
of
RMS
measurement
and averaging
times,
see sec-
tions
4 .2 and 4 .3 and
the
Level Recorder
Instruction
Manuals
.
The
full
potential of
the
Band Pass Filter Type
1617
is realized
when
coupled to a Level
Recorder (or X-V Recorder)
plus
the
Measuring
Amplifier
Type
2607,
so
that
the
fre-
quency
scan
of
the
Type
1617
and averaging
times
in
the
Amplifier
can be
controlled
by
the
automatic
programs generated by
the
Type
1617
.
3.3.1.
Fixed
averaging
time
analysis
with
Level
Recorder
Type
2306
16
Note:
For Recorders before serial
number
576700
a simple
modification
must
be made
to
permit
correct
synchron
ization . A
3,3
kO resistor
must
be soldered on to Card
XC1
062
in
the
position indicated in Fig .3.3 . Access to
the
Card is obtained by
unscrewing
the
four
screws
under
rubber
buttons
to remove
the
rear panel. Remove
the
two
screws
at
the
top
of
Card
ZE
0127
(XC
1059)
and fold
it
down
,
then
remove
the
two
spacers at
the
top
of
Card
ZG
0087
(XL
1060)
and fold
it
down
to
reveal
XC
1062
as
shown
in
Fig.3.4
.
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