Dynascan B&K 2050 User manual
INSTRUCTION
MANUAL
.
..
..-
(
RF
SIGNAL
GENERATOR
Dear
Friend:
Congrat
ula
ti
ons
on
your
purchase
of B&
K-Precision
T st Equipment,
and
welcome
to
the
B & K family.
We
hop
e
yo
ur
experie
nce with
your
new
test
equipment
will
ma
ke y
ou
a lifet
ime
B & K customer.
Your
ins
tru
men
t
is
bac
ked
by
more
than
20
years
of
experience
in d
esign
ing
and
manufacturing.
Our
most
important
g
oa
l
is
your
sa
tisfaction. At B &
K,
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equipmen
t is
mad
e to
me
et
th
e
demands
of
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e field focus
ing
on
de
p
endability
and
acc
ur
acy.
We al
so
conc
entra
te on si
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lici
ty
an
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operati
n
ease
with
features
th
at
red
u
ce
the
possibility
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hum
an
error a
nd
speed
the
servicing
proc
ess
.
In
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termine
th
e
typ
e of t
es
t units t
ha
t
are
needed
we
have
been
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by
lett
ers
an
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reports
from t
ec
h
nicians
and
engineers
w
ho
us
the
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i
pmen
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ily.
Ou
r
fi
e
ld
t
es
ts
and
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dies
ha
ve
helped
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ovide
bette
r
and
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er
serv
ice
tec
hniqu
es. Cl
ose
co
nt
ac
t h
as
been
m
ai
nt
ai
ned
with t
he
m
anu-
fac
t
urers
of
cons
um
er
pro
d
ucts
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test
un
its will
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ec
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and
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ey
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erso
nne
l
in
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co
mp
any
cu
t their
eye
t
ee
th
in
the TV
service
b
usin
ess
.
This
is
why
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hav
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more
"sensitivity"
for
th
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pr
o
bl
em
s
and
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under
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tes
t e
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pmen
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.
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ts
ar
e
made
or
n w
models
devel
o
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to
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ad
v
ances
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o
ur
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dus
try a
nd
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ee
ds
. W
se
t our s
tan
dards
hig
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ured
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hat
the B & K
test
instrum
e
nts
you
buy
r
epresent
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van
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gn
,
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co
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struc
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at
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c
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afford.
If
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u
hav
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com
men
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houg
hts
abou
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our
pro
d
uc
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es
t e
quipment
in
general,
I
would
be
delig
ht
ed to h
ea
r
fr
om y
ou
.
Tha
nks
for your confiden
ce
in
B & K
and
we look
forwar
d to
se
rving you for
a l
ong
t
ime
to come.
Sincerely,
Cl-/~
Carl
Korn
President
INSTRUCTION
MANUAL
FOR
Model
2050
RF
SIGNAL
GENERATOR
TABLE
OF
CONTENTS
Features
..................................................
.-
..
2
Specifications
.................................................
3
Theory
of
Operation
............................................
.4
Operator's Controls and Panel Indicators
................................
5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Applications
..................................................
8
Maintenance
.................................................
11
Adjustments
.................................................
13
Precautions
..................................................
15
Block Diagram (Fig.
1)
..........................................
15
External View
of
the 2050
....
-
................
,
.....................
16
Warranty Service Instructions
...................................
Cov. 3
Warranty
................................................
Cov. 3
FEATURES
•
All
solid-state construction.
• Compact, easy-to-read frequency scale with smooth mechanism.
• 100 kHz to 30
MHz
frequency coverage in 6 ranges, each in different
color on dial for quick, accurate readings.
• Output voltage
of
better than
0.1
V rms, continuously variable to any
desired magnitude through combined use of 20
dB
(approximately 1/10)
attenuator and RF OUTPUT control.
• Modulation
is
either internal (approximately 40% at 400 Hz) or external
(SO
Hz
to 10 kHz)-selectable
by
MODULATION switch.
• High stability against supply voltage fluctuations.
• Convenient markings on dial plate for making adjustments and frequency
checks in Amateur band, TV and
AM
receivers.
2
•
Frequency Ranges
Frequency Accuracy
Output Voltage
Attenuator
Internal modulation frequency
Internal modulation level
External modulation frequency
External modulation voltage
Operating temperature
Power requirements
Power consumption
Dimensions overall
Weight
Accessories
MODEL
2050
SPECIFICATIONS
Band
Frequency
A 100 kHz to 250 kHz
B 250 kHz
to
650 kHz
C 550 kHz
to
1.5
MHz
D 1.5
MHz
to 4
MHz
E 4
MHz
to
11
MHz
F 10MHz
to
30MHz
±1.5%
0.1
V rms or better
(20
•
C.)
HIGH-LOW (provides approximately
20
dB
change)
Approximately
400
Hz
40%,±5%
50 Hz
to
10 kHz
1.5V rms for 40% modulation
0
to
so·
C.
100V, 117V or 230V AC,
+10%,
50/60
Hz (unit
supplied for use
on
117 V
AC,
50/60 Hz line)
2.8 watts
71h
x 9-3/4 x 6-1/8 inches
5 lb.
Shielded lead with insulated clip and banana plug;
fuse; instruction manual.
3
THEORY
OF
OPERATION
1. Outline. Please refer to the block diagram
of
Fig. 1 (P. 15).
The sine
wave
signal produced in the RF oscillator circuit
is
directly amplified by
the modulated amplifier when the MODULATION switch
is
at
CW,
then passes the
output
attenuator, and appears at the
output
terminal. When the MODULATION
switch
is
set to INT, the
output
can be internally modulated to approximately 40%
at
400 Hz by sine
wave
signal from the AF oscillator circuit, or externally
modulated when the switch
is
shifted to EXT. Required level
of
the modulating
signal
is
more than 1.5V rms for 40% modulation at frequencies between 50
Hz
and
10 kHz.
2.
RF
Oscillator Circuit. The RF oscillator circuit employs a Hartley circuit, the
oscillating elements consisting
of
coils (FREQ. RANGE), which are switched in six
ranges, and a variable capacitor (FREQUENCY dial), covering 2.5 times the lower
edge
of
each range or a total range
of
100 kHz to 30
MHz.
The amplifier circuit for the oscillator
is
a high input impedance circuit employ-
ing an FET and includes a feedback resistor for each range
so
that
output
may be
equal in all ranges.
3. Modulated Amplifier. The signal from the RF oscillator circuit
is
amplified
by
Q2, passes the modulated amplifier (a gate-modulated type built around Q3), and
then an
RLC
type low-pass filter before being taken
out
through an emitter
follower, Q4.
4. AF Oscillator Circuit. Transistor
Q5
forms an
LC
oscillator circuit, and its
output
is
couple.d to the modulated amplifier through
VRl
(INT.
MOD.
ADJ.).
5.
Power
Supply. Input
AC
voltage (100V, 117V or 230V
AC)
is
stepped down
to
a required voltage by the power transformer, rectified (full-wave) by rectifier D1,
and passed through a smoothing circuit to obtain the
DC
voltage. This power supply
section feeds 15V
DC
to
all
signal generator circuits
as
"B"
voltage.
4
OPERATOR'S
CONTROLS AND PANEL INDICATORS
NOTE: This instrument
is
supplied for use on 117 V
AC,
50/60
Hz
lines.
For
100 V
AC
or
230 V
AC
operation, please refer to the instructions under "PRECAUTIONS,"
on page 15
of
this manual.
The 2050's controls and their functions are
as
follows (refer to EXTERNAL
VIEW
drawing
on
page 16):
FRONT PANEL
Ref. Controls, Description
No. Connectors, etc.
( 1 ) (Neon lamp) Lights up when POWER switch (2)
is
turned to ON.
(
2)
POWER Slide switch; turns power
ON
when set
to right-hand position.
(
3)
MODULATION Selector switch for modulating signal.
EXT In this mode,
output
signal can be
AM-modulated at any frequency be-
tween 50
Hz
and 10 kHz when a
modulating signal
is
fed to EXT MOD
INPUT terminals (12) and (13).
cw
This
is
the central position
of
the
MODULATION switch, and produces
unmodulated output.
INT Output
is
AM-modulated by the built-
in AF oscillator to approximately 40%
at
400
Hz.
(4)
~
(GND) Grounding terminal.
(
5)
RF OUT Any
output
can be obtained from this
output
terminal.
(
6)
OUTPUT Output attenuator .
=20
dB
HIGH In this position,
output
is
applied
directly to the
output
terminal with-
out
attenuation.
LOW
Gives an attenuation
of
approximately
20
dB.
5
Ref. Controls, Description
No. Connectors, etc.
(7)
RF OUTPUT Permits changing
output
voltage con-
tinuously between Oand 0.1 V rms.
(8)
FREQ.RANGE Used to select frequency ranges indi-
cated on scale (10) and pointer (11)
as
follows:
A:
100 kHz
to
250 kHz
B: 250 kHz to 650 kHz
C: 550 kHz to 1
.5
MHz
D:
1
.5
MHz
to
4MHz
E: 4
MHz
to
11
MHz
F: 10
MHz
to 30
MHz
(9)
(Frequency
d1a
l) Used to select desired
output
fre-
quency. Mechanically ganged with the
variable capacitor and pointer (
11
).
(10
) (Scale plate) Graduated in six ranges
to
read
output
frequencies between 100 kHz and
30
MHz.
(1
1) (Pointer) Indicates scale settings.
REAR
PANEL
(12) EXT
MOD
INPUT Input terminal for external modul
a-
tion signals. To modulate the 2050
with an external modulation signal,
feed a signal to this terminal and set
MODULATION switch
(3)
to
EXT.
Usable modulating frequencies are be-
tween 50
Hz
and 10 kHz.
(13) GND
Grounding
terminal for external
modulation.
(14) (Power cord} Power supply cord.
6
OPERATING INSTRUCTIONS
1.
Preliminary Setup. With power cord (14) connected to a power source, turn power
switch (2)
to
ON. This turns neon lamp (1) on and places the signal generator in the
operating condition. Allow 2 or 3 minutes warm-up for optimum frequency stability.
2. Selecting a Specific Frequency. To set
to
a specific frequency, select a proper range
with FREQ. RANGE switch (8) and operate FREQUENCY dial (9) until its pointer (11)
indicates the desired frequency
on
scale (10). The frequency dial
is
ganged with the
variable capacitor.
For example,
to
set
to
1
MHz:
Set FREQ. RANGE switch (8)
to
C,
and pointer (11) to 1
MHz
on scale (10).
3. Adjusting Output Voltage. Output voltage at output terminal (5) can be continuously
adjusted from O
to
0.1 V rms by means
of
RF OUTPUT control (7). The
RF
OUTPUT
control increases the output voltage when turned clockwise, up
to
O.lV rms at the fully
clockwise position if
output
attenuator (6)
is
at HIGH. When the attenuator is set to
LOW,
the output voltage is reduced
to
approximately 1/10
(-20
dB).
When obtaining a
small voltage, set the attenuator to
LOW,
since this makes adjustments easier at such
small voltages.
4. Using the EXT
MOD
INPUT Terminal (Rear Panel). When connected
to
an external
sine
wave
signal, this terminal enables the output voltage
to
be AM-modulated at a desired
frequency between 50
Hz
and 10 kHz, when the MODULATION switch (3)
is
at EXT.
Required modulating voltage
is
approximately
1.SV
rms
for 40% modulation.
7
APPLICATIONS
The standard radio intermediate frequencies are
as
follows:
AM
Broadcast IF
AM
Broadcast IF,
FM
Broadcast IF
455 kHz
262 kHz
10.7
MHz
In the applications
of
the 2050 described below, it
is
assumed that the broadcast
receiver IF
is
455 kHz, and the
FM
IF
is
10.7
MHz.
Following are examples
of
how to use the B & K 2050 to check the frequency
response
of
RF and IF amplifiers
of
AM
receivers:
1.
Aligning
IF
Transformers.
Set the 2050 to 455 kHz, the intermediate frequency
of
the
AM
receiver to be aligned, and connect the 2050 to the base
of
Transistor Tr2,
a•
mixer (See Fig. 2). The local oscillator must be kept inoperative during this adjustmen·t.
To make it inoperative, shunt the base
of
the local oscillator transistor or the tank circuit
to ground.
Connect an output meter (or a
VOM
set
to
2.5-lOV
DC
range) to the emitter
of
Tr3,
and measure the emitter voltage. This voltage, which
is
high when
IFTl
is
detuned, will
drop
as
IFTl
is
tuned
to
455 kHz. IFT1 now
is
accurately tuned. Next, gradually change
the frequency
of
the 2050
output
to points above and below the 455 kHz point,
to
obtain a curve,
as
shown in Fig. 3. A detuning width between points that yield 3
dB
difference in output
as
compared to the center frequency,
is
the passband
of
the
IF
transformer; the attenuation obtained when the IF transformer
is
detuned
±-10
kHz from
the center frequency,
is
the rated selectivity.
ANT.
Trl
~!
Q)
>
Q)
::J
.9-
::J
0
'------'-----+---_._
_____
freq.
445
455
lnter
-
rn
edia
te
freq.
465
FIG3.
SELECTIVITY
The frequency scale
of
the 2050 is marked with
"y"
at 455 kHz and 10
.7
MHz, for
convenience in u
se.
In this way, the overall selectivity characteristic and gain
of
the IF amplifier can be
determined by measuring IF transformers one by one.
When
finding a maximum point on the AF
output
meter, set MODULATION
sw
itch
(3)
to
INT and u
se
a modulating output; or, set it to EXT if modulating externally. When
utilizing the tuning meter or emitter voltage, the 2050 may be either modulated
or
unmodulated. When measuring the bandwidth
of
IFT's, however, an unmodulated signal
is better, since it indicates their characteristics more faithfully.
2. Tracking. A test circuit for tracking is shown in Fig. 4. Tune the 2050
to
the receiver
frequency to
be
tested, and feed its
output
to the antenna circuit.
Three different frequencies generally
are
specified for this t
es
t:
Long
Wave
180 kHz
240kHz
320 kHz
Medium
Wave
600 kHz
1000 kHz
1400 kHz
9
Short
Wave
4.0MHz
7.0
MHz
10.0
MHz
Measure and adjust the RF tuner and local oscillator frequencies using the above three
testing frequencies. Couple the 2050
to
the antenna terminal through a 100 pF capacitor.
This capacitor serves
as
a dummy antenna, which minimizes the effects
of
generator
loading
on
the tracking adjustments.
Adjust the receiver controls for maximum output when a 400
40%
internally
modulated
signal
is
supplied from the 2050. Practical receiver sensitivity
is
expressed in
terms
of
a minimum input signal voltage which produces a signal-to-noise ratio (usually
20
dB)
as
measured at the audio output.
NOTE: The receiver being checked
will
produce
an
image
signal in addition
to
its true
signal because
of
its superheterodyne action. Such
an
image
will
be 910 kHz away from
its true signal when the
IF
is
455 kHz, and in some receivers may appear nearly as strong
as
the true
signal
in short
wave
bands. The image frequency can be identified
as
follows:
If the receiver local oscillator operates below the incoming carrier frequency, the image
frequency appears at a point which
is
twice the IF below the carrier frequency
to
which
the receiver
is
tuned. Conversely,
if
the receiver local oscillator operates
above
the
incoming carrier frequency, the
image
appears at twice the intermediate frequency
above
the frequency to which the receiver
is
tuned.
ANT
FIG4.
TRACKING
ALIGNMENT
10
MAINTENANCE
1. Removing the Cover. Remove the 3 screws on the left and right side plates, using a
Phillips screwdriver. The cover can then be removed by lifting it up by the handle
on
the
top, since the cover has only 3
sides-it
has no face, back or bottom side.
2. Replacing the Cover. To replace the cover on the chassis, loosely thread one screw
on
each side at the front end
(marked*
on drawing), before replacing the cover.
Next, place the cover on the chassis, starting at the front edges, making certain
to
fit
the slots provided at the front edges
of
the cover in the center, on
the(*)
screws loosely
attached beforehand to both left and right sides. Now press the cover down
onto
the
chassis until it sets properly. (NOTE: In replacing the cover, exercise caution
not
to
allow the front end
of
the case
to
strike the panel and cause damage.)
Next, fasten the left and right side plates
of
the cover
to
the chassis with the screws
at
the rear and bottom
of
each
of
the side plates.
CAUTION
When removing the cover, be careful not to
touch the internal printed circuit board or
other parts. Also, always disconnect the
power cord, because 117 V
AC
is
present at
the printed circuit boards.
11
3. Removing the Front
Panel.
To
remove the front panel, loosen the set screws for the 3
knobs on the panel and remove the knobs. Then, loosen the 2 screws from the middle, at
the left and right sides (these
screws
also fasten the cover to the case). Next, loosen the 2
set screws from the bottom
of
the panel.
Now hold the panel with both hands and pull it toward you; the panel will slide off
the chassis. NOTE:
When
removing panel, pull it gently, taking care not to allow the
panel
to
be caught by terminals, slide switches, neon lamp, etc.
/
12
ADJUSTMENTS
The Model 2050 signal generator
is
shipped completely factory-adjusted. Should
readjustments become necessary, be sure to measure the power source voltage before
adjustments are made. This should be
15
V, ±1
V.
The test equipment to be used for calibration also should be calibrated.
Prior
to
adjustment, set the controls
as
follows unless otherwise noted:
(1)
MODULATION
(3) at
CW
(2) OUTPUT ATT (6) at HIGH
(3) FREQ. RANGE (8)
at
C
(4) RF OUTPUT (7) at maximum
output
(fully clockwise position)
(5) FREQUENCY dial (9)
at
1
MHz
Prior
to
proceeding with the adjustment, make
DC
voltage checks
of
all circuits
to
make sure they are operating normally.
1. Adjusting the Output Voltage
(1) Connect an RF voltmeter
to
output
terminals (4) and (5).
(2) Adjust semi-fixed resistor VR2 until the
RF
voltmeter reads more than 0.1 V
rms.
(If
an ordinary
AC
voltmeter
is
used
as
an alternative,
use
range
"A"
for a
narrower frequency response.)
2. Adjusting Internal Modulation Percentage
If
an oscilloscope
is
used, adjustment may be accomplished either with a wave-
envelope pattern or with the trapezoidal pattern method. In either case, adjust at a
freqµency withir.. range A
of
the signal generator.
(1) Set
MODULATION
switch to
INT.
(2) Connect an oscilloscope to
output
terminals (4) and (5).
(3) Adjust the semi-fixed resistor
VRl
until approximately
40%
modulation
is
obtained.
13
rl
B A
_J J
Wave
Envelope Pattern Method Trapezoidal Pattern Method
3. Adjusting the Pointer
A-B
%MOD=--xl00
A+B
(1) Adjust the variable capacitor to provide a maximum value.
(2) Adjust the pointer
to
align with the index mark adjacent
to
the Band F letter.
4. Adjusting the Oscillation Frequency
{1) Connect a frequency counter to output terminals (4) and (5).
(2) Set the FREQUENCY RANGES to C and the pointer
to
550 kHz. Confirm that
the oscillation frequency
is
accurate
to
±.1
.5%
of
550 kHz.
If
not, adjust L3.
(3) Then, shift the pointer to 1.5
MHz
and confirm that the oscillation frequency
is
1.5
MHz,
±1.5%.
If
not, adjust trimmer TCl, located on the variable capacitor.
(4) Return the pointer
to
550
kHz
and reconfirm that the signal generator
is
oscillating at 550 kHz,
±_1.5%.
If
there
is
a greater deviation, repeat adjustments
(2) and (3) until the correct frequency
is
obtained.
(
5)
Calibrate the other ranges with the pointer set to the lowest frequency
of
the
range. Adjust coil
Ll,
for range
A,
coil L2 for range
B,
coil L4 for range D, coil
LS
for range E and coil
16
for range F. Trimmer
TC
1, which has been adjusted
under step (3), should not
be
touched again.
(6) Other intermediate scale graduations are calibrated automatically
by
the above
adjustments.
14
PRECAUTIONS
1. Altering Power Transformer Primary. The primary power transformer can be altered
for the various supply voltages.
Locate jumper lead connected to pin 32 on the printed circuit board. Connect
opposite end
of
jumper wire
as
follows:
Fuse for 230 V
AC
operation
is
0.1
A.
Fuse
To Pin
35
34
33
For Supply Voltage
100 V
AC
230 V
AC
117 V
AC
100 V
AC
117 V
AC
230V
AC
0
28
O
29
O
30
31
0
Jumper
Wue
/
:::---
--
---1
•
35
04-
• - - - - - - -
..J
o 36
0 2!
2.
Warm-Up
Period. Although the 2050 signal generator
will
begin operating
as
soon as
power
is
applied, allow approximately 3 minutes for the circuits to warm up, to ensure
accurate measurements.
3. Attenuation
of
Shielded Lead. Since the shielded lead has a capacitance
of
approximately 100
pF
between the conductor and shield for every 3 ft.
of
length,
output
voltage will
be
attenuated. At 30
MHz,
for example, this attenuation is 6
dB.
If
this
attenuation must be reduced, use a separate, shorter lead
to
reduce the lead capacitance.
RF
OSC
1--~----1MODULATED,__~--,
AMP
OUTPUT
ATT
400Hz
EXT
.
MOD
~~~~o
~
INPUT
I
EXT
.
CW
.
INT
.
FIG
I .
BLOCK
DIAGRAM
15
~~~~~--+e10UTPUT
+B
POWER
SUPPLY
!
GND
~====:j~
l=
AC
11lOV
/ I
17V
/230V
50-60Hz
10
®
8
/liCJMODEL
2050
11
lllill
///~
llll
1i / / /
/~
9 ''!!
JIIPrl
12
_t
XTMOO
II
'"PUT
7
<®
GND
13
II
@)
1
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EXTERNAL VIEW
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WARRANTY/ SERVICE INSTRUCTIONS
1. R
efer
to
th
e
ma
in
te
n
ance
se
ctio
n of
the
instruction
manu
al
for ad-
justmen
ts that
may
be
app
li
ca
ble.
2.
Chec
k
common
elec
tronic
parts,
s
uch
as
t
ransis
t
ors
ancl
batteries.
Always
check
ins
truction
ma
n
ua
l for n
pp
li
cab
le adjus
tments
after
such
re
pl
a
ce
me
t.
3. D
efe
ctive
par
ts
re
m
oved
from
u
nits
un
d
er
warran
ty s
hou
ld
be
retu
rn
ed to the
fac
tor
y, prepaid. The
package
shou
ld
inclu
de
th
e
mode
l
nu
ber,
eri
al
nu
mb
er
an
cl
de
te of p rod
uc
t
purcha
se. T
he
se
part
s will
be
ex
,
hang
ed
at
no
c
ha
rge.
4. If t e
above
pr
oc
ed
ures
do
not
correct
the
diffi
culty,
pa
ck
the
p
ro
d
uct
secur
ely (
pref
e
rab
ly
in
t
he
origina
l
carton
or
dou
ble
pa
cked),
forw
ar
d
it
pre
p
ai
d (
express
preferred
)
to
your
nearest
B & K A
uthori
zed e
rvice
Agency.
A detail
ed
list
of
troub
l
es
en
-
co
unt
ered sh
ou
ld
be
enclosed.
Co
nt
ac
t
your
l
oca
l B & K Dis
tribut
or
for
the
name
and
l
oca
ti
on
of
your
nearest
service
ag
ency,
or
wri
te to :
Service
Depar
t
me
nt
DYNASCAN
CORPORAT
I
ON
1801
West
Belle Plai
ne
Ave
n
ue
C
hica
go,
Illinoi
s 60613
"B
& K
warrants
that
eac
h p
roduct
man
ufa
ctured
by
it
will be fr
ee
from
defects
in
material
and
workmun-
ship
un
de · n
ormal
usage
a
nd
service
for a
period
of ninety
days
after
its
purchase
new
from
an
authorized
B & K
distri
b tor.
Ou
r
oblig
ation
under
this
w
arrant
y is
limited
to
repairing,
or
repl
a
cing
any
product
or
component
whic
h
we
are
satisfied
does
no
t
conform
with
th
e
foregoing
w
ar
ran
ty
and
which
is
returned
to
our
factory
or
our au
thori
zed
service
contractor,
transportation
prepaid,
and
we
shall
not
otherwise
be
liable
for
any
damages,
conse
q
uential
or
otherwise
.
The
foregoing
warranty
is.
exclusive
a d ·
lieu
of
all
other
warranties
(including
any
warrantv
of
m<'rchantab'
lit_
•) ,
chcthcr
r. re
sed
o ·
/"
ed
.
Suc
h
warr
ant
y
shall
not
apply
to
any
product
or
compon<>nt
(1)
repaired
or
alt<>rccl
by
anyone
ot
her
than
B & K
or
its
au
thorized
sNvice
contractor
e
cpt
nom1al
tub
e r
ep
l
acemen
t) w
it
hou
t B 's
prior
written
app
rova
l ;
(ii) t
ampered
with
or
altere
d
in
an
y
way
or
subjected
to
misuse,
negligence
or
accident;
(iii)
which
has
th
e
serial
number
altered
,
defa
ced
or
removed;
or
(iv)
which
has
been
improperly
connecte
d,
in
sta
lled
or
adjusted
otherwise
th
an
in
accordance
with
B &
K's
instructions.
B & K
reserves
the
right
to
dis
con
tinu
e
any
model
at
any
time
or
change
specifications
or
design
w
ithout
notice
and
without
i
ncurring
any
ob
liga
-
tion.
The
wa
rranty
shall
be
void
and
·
there
shall
be
no
warranty
of
any
product
or
component
if
a B & K
warranty
registration
card
is
not
properly
completed
and
postmarhed
to
the
B & K factory
within
five
days
after
the
pu
rchase
of
the
product
new
from
an
authorized
B & K
distributor."
DYNASCAN
CORPORATION
1801 West Belle Plaine Avenue, Chicago, Illinois
60613
480-135-9-001 © 3387 Printed in
Japan
050-0970-00
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