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Pot Voltage
Made
(n
Denmark
~@
Ext. Filter
Fmm Output
Frequency Control
Voltage
Fi1ed
freq.
To
2020
-
Vor.
Freq.
To Input
~(I) (f)
ln
Out
Ext. 8& T Program
Overload and Frequency Marking
e
~~
-4.Digit
\_ ""-
5.
Digit
Off
Sweep Drive Gear
~
1:10
.
1:1
Fixed Freq. 1.2 MHz
-
Frequency Range A~justment
Var.
Freq. 1.0.1.2
MHz
(i"
Full Ronge
'i)
Set
Set
lower
limit
Upper
limit
Fig.4. View of rear panel of 2010 showing the various input and output sockets
The filter section also comprises
A, B, C and D weighting networks
for sound level measurements and
bandwidth compensation according
to 1
/vB
for power spectral density
measurements.
The
filter
section
can be by-passed to obtain a linear
response, and sockets are provided
for connection of other filters. For
connection of Heterodyne Slave Fil-
ter Type 2020 the necessary con-
trol signals are available at the ap-
propriate sockets at the rear of the
Analyzer.
Output Amplifier
The filter section is terminated by
an output amplifier with a gain of
80 dB and an attenuator with a
range of 60 dB
in
10 dB steps. Over-
load is indicated by the overload in-
dicator
.
Meter and Output Circuit
The 2010 is equipped with a true
RMS rectifier circuit. It has a linear-
ity within
±
0,5 dB for signals with
crest factors up to 5. The dynamic
range
is
50 dB (60 dB for crest-fac-
tor 1 ,4) and the rectifier features se-
lectable
averaging
times
in
the
range 0,1 s to 1 00 s. The meter
has a fast and a slow mode as stan-
dardized
for
sound
level
meters.
The meter can be switched between
the output of the analyzer and the
BFO. Connected to the BFO the me-
ter will indicate the electromotive
force of the output signal in the at-
tenuator mode (600 0) and the ac-
4
tual voltage on the output when the
BFO is in the direct output mode
(50)
.
Moreover, a linear to logarithmic
converter can be switched into cir-
cuit to give the meter a logarithmic
response in addition to the linear.
The 2010 also provides for the
connection of a recorder. The out-
put signal can be
taken
either from
the
AC signal at the output ampli-
fier or from the rectifier, giving a lin-
ear or a logarithmic DC signal.
B
&
T
Programs
-
Control Circuit
A
unique
feature
included
for
power
spectral
density
measure-
ments
is
the B & T program selector
circuit. This allows a number of pro-
grams to be chosen in which the
bandwidth B of the analyzer and the
averaging time T of the rectifier are
Pos. 1.
Position of
automatically changed with the tun-
ing frequency.
By increasing the bandwidth with
increasing
frequency a high scan-
ning speed can be chosen. By simul-
taneously changing the time con-
stant an equal statistical confidence
over the entire frequency range
is
maintained.
The B & T programs can also be
remotely controlled.
The following modes are avail-
able:
Pos
.
1.
T constant
-
B
variable.
When T is constant, the value can
be selected in the range 0,1 s to
1 00 s with the knob
"Effective
Aver-
aging Time T". The bandwidth will
vary with the setting of the tuning
frequency knob on the frequency
scale according to the table below.
bandwidth selector
Automatically selected bandwidth in Hz
1000
Hz
3,16
10
31,6
100
316
1000
316
Hz
3,16
3,16
10
31,6
100
316
100
Hz
3,16
3,16
3,16
10
31,6
100
31,6
Hz
3,16
3,16
3,16
3,16
10
31,6
10
Hz
3,16
3,16
3,16
3,16
3,16
10
3,16 Hz
3,16
3,16
3,16
3,16
3,16
3,16
Switch-over
Frequency Hz
63
200
630
2k
6,3k
(x 1, log scale)
Switch-over frequencies
xO,
1,
x
1 and
x
1 0 according to range
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