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BRUEL & KJAER 2305 - Page 79

BRUEL & KJAER 2305
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Automatic
Recording
of
Frequency
Characteristics.
In
the
production
of
electronic
devices
and
components
a
recording
of
their
frequency
chara
c
teristic
is a
great
asset,
as
it
provides
an
accurate
means
of
determining
their
quality
.
When
the
Level
Recorder
is
employed
in
combination
with
B & K
oscillators
an
equipment
is
obtained
for
the
automatic
recording
of
frequency
char-
acteristics
on
electronic,
electro-acoustic,
electro-mechanical,
acoustical
and
mechanical
devices.
Some
examples
of
this
type
of
application
are
given
below.
Frequency
Response
of
a
Filter
Circuit.
In
Fig. 6.13 a
measuring
arrangement
for
the
automatic
recording
of
filter
response
curves
is
shown.
The
B & K
Beat
Frequency
Oscillator
(B.F.
O.)
Type
1017
covers
the
frequency
range
2-2000
Hz (ci
s)
but
substituting
this
B.F.O.
with
the
Type
10,22
or
Type
1013
frequency
ranges
of
20-20000
Hz
(cis)
or
200-200000
Hz
(cis)
can
be
covered
respectively
.
<
Amplifier
Filter
20
Hz
<
Amplifier
Fig. 6.13. Set-up
lor
recording filter characteristic.
In
Fig.
6.14a
and
b is
reproduced
the
recorded
response
of
a 20 Hz (cis)
filter.
To
be
able
to
judge
the
slope
of
the
filter
the
recording
was
firstly
carried
out
with
a
75
dB
Range
Potentiometer
(ZR 0006), vide Fig. 6.14a.
To
examine
the
response
of
the
transmission
band,
a 10 dB Range
Potentiometer
(ZR 0003)
was
then
utilized
in
the
Recorder
in
another
measurement,
refer
Fig. 6.14b.
The
recordings
were
made
on
non-frequency
calibrated
paper,
and
the
frequency
"scale"
on
the
paper
extended
compared
to
that
used
with
fre-
78

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