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Pos. 2.
Position of time
constant selector
Automatically selected averaging time (s)
0,1 s
30
10
3
1
0,3
0,1
0,3 s
100
30
10
3
1
0,3
1
s
100
100
30
10
3
1
3
s
100
100
100
30
10
3
10
s
100
100
100
100
30
10
30
s
100
100
100
100
100
30
100
s
100
100
100
100
100
100
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
Pos. 3.
Position of
bandwidth selector
Automatically selected bandwidth in Hz
1000
Hz
31,6
100
316
1000
316
Hz
10
31,6
100
316
100
Hz
3,16
10
31,6
100
31,6
Hz
3,16
3,16
10
31,6
10
Hz
3,16
3,16
3,16
10
3,16 Hz
3,16
3,16
3,16
3,16
Position of averaging
time selector
Automatically selected averaging time in s
0,1 s
3
1
0,3
0,1
0,3 s
10
3
1
0,3
1
s
30
10
3
1
3
s
100
30
10
3
10
s
100
100
30
10
30
s
100
100
100
30
100
s
100
100
100
100
Switch-over
frequency Hz
63
630
6,3k
(x 1, log scale)
Switch-over frequencies xO, 1, x 1 and x 1 0 according to range
Pos. 4.
Position of
bandwidth selector
Automatically selected bandwidth in Hz
1000
Hz
100
316
1000
316
Hz
31,6
100
316
100
Hz
10
31,6
100
31,6
Hz
3,16
10
31,6
10
Hz
3,16
3,16
10
3,16 Hz
3,16
3,16
3,16
Position of time
constant selector
Automatically selected averaging time in s
0,1 s
1
0,3
0,1
0,3 s
3
1
0,3
1
s
10
3
1
3
s
30
10
3
10
s
100
30
10
30
s
100
100
30
100
s
100
100
100
Switch
-over
frequency Hz
200
2k
(x 1, log scale)
Switch-over frequencies xO, 1, x 1 and x 1 0 according to range
Pos. 2. 8 constant -
T variable
.
8 is constant at the value selected
with the knob "Selectivity Control"
in the range 3,1 6Hz to 1000Hz.
The averaging time will vary with
the tuning frequency according to
the table.
Pos. 3
.
8 variable -
T variable. 8
x
T constant
.
8 and T can be se-
lected in such a way that the pro-
duct 8
x
T is kept constant accord-
ing to the table
.
Pos. 4. -
8 and T can be se-
lected so that the product 8 x T is
kept
constant
according
to
the
table. Different switching frequen-
cies have been chosen as compared
to position 3.
Pos
.
5. -
8 and T are constant.
The values are those chosen by the
setting of the corresponding knobs.
Internal Signal Section
The internal signal section pro-
vides the necessary signals at cor-
rect frequencies which are needed
for the various circuits of the instru-
ment. In order to obtain maximum
frequency
stability the section
is
based on a crystal parallel reson-
ance type oscillator which gener-
ates a signal of 960kHz. This sig-
nal is converted into a 1, 23 MHz
signal for the second mixer stage
and the VCO, 1,2 MHz for the 8FO,
1 ,08 MHz for the frequency conver-
ter of the VCO, 1 20kHz for the fre-
quency counter, 30,75 kHz for the
third mixer stage and 12kHz for the
frequency counter.
Voltage Controlled Oscillator
(VCO)
The VCO which makes the 2010
well suited for external control and
programming supplies the variable
frequency signal for the first mixer
stage and for the 8FO. The controll-
ing DC voltage is supplied either
from a potentiometer connected to
the shaft in the centre of the main
frequency scale or from an external
source for remote control of the fre-
quency sweep. The DC signal is
either fed directly to the oscillator
circuit giving a linear sweep or via a
linear to logarithmic converter re-
sulting
in
a
logarithmic
sweep.
When a varying DC control voltage
is applied there will be a delay in
the frequency change of the output
signal corresponding to 1,5 ms
.
If,
5
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