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a voltmeter and wideband amplifier
as· well as allowing external filters
to be connected. The tuned-in fre-
quency can be read-off the large
main frequency scale (lin and log
calibration) and on a 6 digit 7-segment
display. There are a number of pro-
grams in which the bandwidth and
meter rectifier time constant are
controlled
as
a function
of fre-
quency, and a bandwidth compensa-
tion has been included for power
spectral density measurements.
The measured signal is rectified
in a true RMS
rectifier
with a dy-
namic range of 60 dB and capability
of handling signals with crest fac-
tors up to 5
.
The indicating meter
has interchangeable scales and di-
rect indication of measuring range.
Other features included are
:
AFC cir-
cuit for easy tuning to signal peaks,
compressor
circuit
for
automatic
control of oscillator output voltage
in feed-back loops, remote control
facilities for frequency sweep, band-
width and time constant, built-in A,
B,
C,
D weighting
networks for
sound level measurements, built-in
power supply for condenser micro-
phone assemblies, output for recor-
ders, and built-in lin-log converter
giving lin or log scaled meter read-
ing and DC output signal.
To obtain a graphic representa-
tion of the frequency analysis the
2010 can be synchronized with a
Level Recorder Type 2307 or 2309,
or an X-Y Recorder such as Type
2308. Both mechanical and electri-
cal synchronization is possible with
Type 2307.
The 201 0 operates as an auto-
matic tracking analyzer in the fre-
quency
range
20Hz
to
200kHz
when tuned from the Tracking Fre-
quency Multiplier Type 1901. This
instrument locks onto and tracks
the fundamental or a harmonic of
practically any type of periodic wave-
form.
The 2010 will also operate as an
automatic
tracking
analyzer
to-
gether with the Distortion Measure-
ment Control Unit Type 1902 for
swept measurement of non-linear
distortion
in
the
range
2Hz
to
200kHz. This instrument consists
of a two-tone generator providing
test signals for the measuring ob-
ject, and a frequency synthesizer
providing a control signal to tune
the 2010
.
The 1902/2010 mea-
sures
harmonic,
difference-fre-
quency and intermodulation distor-
tion to DIN and IEC standards and
difference-frequency and intermodu-
lation distortion according the CCIF
and SMPTE methods, respectively.
Distortion components up to fifth or-
der can be continuously tracked typi-
cally down to -80 dB. For further
information on this instrument see
separate data sheet.
1
To
From
0
1
Input
Output
AC
t
I
' l
r------~~---
...
-0'
Recorder
:I
I
Ove;d
I
Overload
______r,
v
I
liE"-F;lw
r
u"?
i
'
0"""'
I
Attenuator
1 Mixer
2 Mixer
J
3 Mixer
Circ.Select.
Attenuatorift.nalyzer
RMS
R~ct.
~
1
0
Signal;.._ Amplifier
t-~
BP Filter
~
BP Filter
BP Filter
A, B,C, D ,. Output
~
Aver.
Tim
~
~
/
Input~
LP Filter
1,2 MHz
~kHz
L...-..-
750Hz
-Filter
Ampl
·
_
~
• Lin-Log
u
i
I
~
I
·~ Co~p
'
ro
CoT'
Log~~.~"'
.__M_e_te-r
...J
i
External
:
/~-----------n
I
~~~~~
II
l~x~e~nal
Variable
(/":
II'
0
t
.._-----++---------------<>..,.
L
·~~
Frequency
~.75kHz
1
_
I
Crystal
1 - - - - -
AFC
I
Oscillator -
Frequency
I
11.2
MHz
Phase
I
960
kHz
Converter :±:11,23 ~Hz
_
I---
Detector
Var iable
I
I
~
Freq
.
To 2020
.---+----...,--~ 1 0
1 2
Fixed
I
1
11.08 MHz
MH:o
'
F~~~:
1Wkfui
12~1~~~~~~
~~~~-----~-------~-~----~--~Fi~
I
Frequency_
~
Frequency
r
f
15
b
l
Frequency Range
Freq
.
I
Display
---Counter
15
AFCr
X
10 x0,1
I
1,2 MHz
:
o.
1
s
..,n---T.!...--~
Frequency)..
I
X
r
Marker
Tin
~External
I
Frequency~ ~~;:~,~
·n
vco
Control
1
Voltage
Lin-Log
...., Frequency """"..._. Frequency _
Voltage
Frequency
Manual
Converter
Converter
Converter
To
2020
1
Out
Setting
-
-
.__ _
___,
Variable
;.,_
I
f
Frequency
I__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
~-
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_
BFO
-
Compres·
.,...
Modu_
lator
...,j._
Attenuatorl---i.,_....O OBFutOput
sor
LP
F
1lter
Am pl.
Compressor Input
740165/
1
Fig.1. Block diagram of 2010
Description
The block diagram of the 201 0
shown in Fig
.
1 is described in the
following text.
The signal to be analyzed is fed to
the first mixer stage via the input at-
tenuator and amplifier
.
In the mixer
2
1t 1s mixed with the signal from the
voltage controlled oscillator (VCO).
The frequency of this signal
is
adjus-
table
in
the
range
1, 2 MHz
to
1,0 MHz in order to give a 1,2 MHz
signal after mixing with the signal
to be analyzed. From the first mixer
the signal is fed to the 1, 2 MHz
band-pass filter and to the second
mixer
.
The frequency of the signal
is here transformed to 30kHz by
mixing with a 1,23 MHz signal. The
30kHz signal is fed to the 30kHz
band-pass filter where the 1000Hz
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