Tape Recorder
7001
Measuring
Amplifit;!r
2606
-
level
Recorder-
2305
-i
I
I
I
.._
______
....
--------------
-----.J
11.9297
Fig.4.5 Set-up
for
synchronised frequency analysis
of
tape recording
things
the
requirements included in the I.S;O. Recommendation
for
measurements
of
Absorption Coefficients in a Reverberation Room and
"Field
and Laboratory Measurements
of
Airborne
and Impact Sound Trans-
mission".
However, the 1402
has
too
limited
a frequency range
(20Hz-
20
kHz ± 1 dB) at
full
output
power,
to
utilize
the complete frequency
ranges
of
the 1614/15. The Level Recorder
Type
2305 can
be
used
to
automatical-
ly
scan
the 1614/15.
OPERATION
A combination
of
the 1402 and
1614/15
(I) Connect up
circuit
as
shown_
Fig.4.6.
(II)
Set control knobs on Filter Set
as
follows:
POWER
"On"
SCANNING
"Manual"
Selective
range
1/3
or
1/1 octave bands
as
desired.
(Ill)
Set the control knobs on the Noise Generator
as
follows:
J METER
TIME
CONSTANT
is
set
to
a position where a stable
deflection
of
the indicating meter
pointer
is
achieved.
NOTE: Using a high meter-time-constant value, the METER
TIME
CONSTANT may
first
be
set
to
a
low
value and then
to
the
position required.
In this manner a faster reading
is
obtained.
29
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