PRICE
ONE
DOLLAR
CATHODE-RAY
OSCILLOSCOPE
Type
WO-33A
• Specifications
•
Operation
• Applications
•
Maintenance
e)
RADIO
CORPORATION
0'
AMERICA
~
.'
~l:
ELECTRON
TUBE
OlVISION
HARRISON,
N.J.
~
ELECTRONIC
INSTRUMENTS
CAMDEN,
N.
J.
Safety
Precautions
The
metal
case of this instrument
is
connected
to
the
ground
of
the
internal circuit.
For
proper
opera-
tion,
the
ground
terminal of
the
instrument should
. always
be
connected
to
the
ground of
the
equipment
under
test.
The
WG-349A
Direct/Low-Capacitance
Probe
and
Cable
has a shield throughout its entire
length
which
is
connected
to
the
instrument
ground
and
case.
Care
should
be
exercised to avoid striking
the
cathode-ray
tube
or subjecting it to more
than
mod-
erate
pressure
in
handling.
Because
the
tube
contains
a high
vacuum,
implosion might result in injury
from flying glass.
An
important
point
to
remember
is
that
there is
always
danger
inherent
in testing electrical
equip-
ment
which
operates
at
hazardous voltages. There-
fore,
the
operator
should
thoroughly familiarize him-
self with
the
equipment
under
test before working
on it,
bearing
in
mind
that
high voltages
may
appear
at
unexpected
points in defective
equipme~t.
Addi-
tional
precautions
which
experience in
the
industry
has
shown
to
be
important
are listed below.
1.
It
is good
practice
to
remove power before
connecting
test
leads
to
high-voltage points.
If
this
is impractical,
be
especially careful to avoid acci-
dental
contact with
equipment
racks
and
other
ob-
jects which
can
provide a ground.
Working
with
one
hand
in your pocket
and
standing
on
a properly
insulated
Hoor
lessens the
danger
of shock.
2. Filter capacitors may store a
charge
large
enough
to
be
hazardous. Therefore,
discharge
filter
capacitors before
attaching
test
leads.
3.
Remember
that
leads with
broken
insulation
provide
the
additional
hazard
of high voltages
ap-
pearing
at
exposed points along
the
leads.
Check
test leads for frayed or broken insulation before
working
with
them.
4. To lessen
the
danger
of accidental shock,
disconnect test leads immediately
after
test
is
completed.
.5.
Remember
that
the
risk of severe shock
is
only
one of
the
possible hazards.
Even
a minor shock
can
place
the
operator
in '-hazard of
more
serious
risks such as a
bad
fall or
contact
with
a source
of
higher
voltage.
B.
The
experienced
operator
continuously
guards
against injury
and
does
not
work on
hazardous
cir-
cuits unless
another
person is available
to
assist
in
case of accident.
ITEMS
Supplied
with
WO-33A
Direct/Low-Capacitance
Probe
and
Cable
Type
No. WG-349A
1
BX4
1
BBK7A
1 BC4
2
12AT7
1 BBR8
Instruction Booklet
Available
on
Separate
Order
1 RCA
3AQPl
For
rf
applications from
500
Kc to 250 Mc:
Demodulator
Probe ........
Type
No. WG-350A
Devices
or
arrangements
shown
or
described
herein
may
use
patents
of
RCA
or
othet's.
Information
contained
herein
is
furnished
without
responsibility
by
RCA
for
its
use
and
without
prejudice
to
RCA's
patent
rights.
TMK
®.
Marco
Registrodo
• 2 •
WQ-3]AIB(2)
3-60
Printed
in
U.S.A.
Cathode-Ray Oscilloscope
Type
WO-33A
Contents
Safety
Precautions
......................................... .
Items
Supplied
with
WO-33A
Description
Specifications
Functions
of
Controls
and
Terminals.
Operation
Initial
Procedure
Vertical-Amplifier
Operation
Horizontal-Amplifier
Operation
Sweep-Oscillator
Operation
Use
of
WG-349A
Probe
Calibration
and
Voltage
Measurement
Applications.
. .............. .
Analyzing Composite Television Waveforms
Alignment
Schematic
Diagram
of
WO-33A
...... .
General
Applications
............ .
Square-Wave
Testing of Audio Amplifiers
..
Phase-Shift Measurements
Frequency
Measurements ............................ .......
..
Industrial
Applications
........................... ,
..
Engine-Pressure Analysis
Vibration Measurements
.
Maintenance.
General
Astigmatism Adjustment
Vertical Attenuator Alignment
.............. .
Internal Calibrator Control
Adjustment...
Repair
Service
Replacement
Parts
List.
Warranty
• 3 •
Page
:\'/0,
2
2
5
6
8
8
8
8
8
9
9
..11
..........
11
14
12-13
18
18
18
19
20
20
20
21
..... 21
21
21
21
...
21
22-2.3
23
Description
The
RCA
WO-33A
is a 3-inch oscilloscope de-
signed for
"on-location"
and
service-shop use in
servicing color
and
black-and-white television re-
ceivers, Hi-Fi
equipment,
PA
and
sound reenforcing
systems,broadcast
station
and
remote equipment,
communications
and
industrial electronic equipment.
A novel feature of
the
WO-33A is
the
Vertical
Input
Attenuator
which
automatically switches
the
amplifier from
Wide
Band
to Narrow Band
when
in
the
three
highest
gain positions.
Another
important
feature of
the
WO-33A
is
the
exceptionally
high
gain in its vertical amplifier.
There
is enough sensitivity
to
provide a useful display of signals from low-level microphones, phonopickups
and
other
weak
signals found in radio/TV
receivers, audio amplifiers, etc.
A voltage-calibrated, frequency-compensated ver-
tical-input attenuator,
an
internal calibrating-voltage
source,
and a graph
screen scaled directly in volts
make
it
possible
to
use
the
WO-33A as a visual
voltmeter.
The
unique
system of calibrating the
graph
screen provides for scaling voltages directly
from
the
screen.
The
measurement
procedure
is
very
similar
to
that
employed
with
a vacuum-tube volt-
meter. A calibrating voltage
is
automatically applied
to
the vertical amplifier
when
the
bandwidth
control
is
set
to
the
calibration position. This switch also dis-
connects internally
the
input
and
attenuator
circuits,
making
it
unnecessary
to
remove leads
and
probes
from
the
external circuit
under
test. These unique
facilities make voltage calibration
and
measurement
a simple, almost
automatic
procedure.
The
sweep-frequency control
is
continuously
adjustable from 15 cps
to
75
Kc.
The
sweep oscil-
lator has excellent stability
at
high sweep rates, a
fast retrace,
and
adequate
linearity throughout its
frequency range.
The
over-all frequency range of
the
oscillator
is
divided
into four basic ranges; a
vernier adjustment,
which
overlaps
the
basic sweep
ranges, provides exact
adjustment
of
the
sweep fre-
quency.
The
amount
of sync signal
fed
to
the
sweep
oscillator may
be
adjusted
by
means of a front-panel
• 4 •
control. Sweep synchronization is exceptionally
stable throughout
the
sweep range
of
the oscillator.
A
phase
control is provided for varying
the
phase
of the internal sweep voltage
when
the
"LINE"
position of
the
H/SWEEP
SEL
cOlltrol
is
used, en-
abling
the
WO-33A to
be
phased
with
an
external
line-frequency sweep oscillator.
To
facilitate its use,
the
WO-33A is
equipped
with
a specially designed single-unit
probe
and
input
cable. This accessory,
the
WG-349A
DirectiLow-
Capacitance Probe
and
Cable, is provided
with a blue
input
lead
and
a yellow input lead.
When
the
blue
input
is used,
the
test signal
is
fed directly
to
the
vertical-input terminal.
When
the
yellow
input
is
used, a special high-impedance circuit
in
the
probe
is
connected in series with
the
test point
and
the
'scope. This high-impedance circuit presents
an
over-
all
input
resistance of 10 megohms
and
an
input
capacitance of approximately 10
ppf
to
the
test
cir-
cuit. This feature reduces circuit-loading effects
and
permits use
in
circuits which would not function
properly
if
loaded
down
by a conventional oscillo-
scope.
The
WO-33A
can
be
used to trouble-shoot
and
signal
trace
all sections of
both
black-and-white
and
color-TV receivers. The voltage-calibrating facil-
ities,
wide
band-pass,
and
high-impedance
input
characteristics make possible observations
and
meas-
urements of color-burst signals
and
othe'; critical,
,.
high-frequency waveshapes in circuits
which
are
sensitive to loading effects.
The
size
and
weight
of the WO-33A make
it
an
especially portable instrument, useful
in
such
appli-
cations as industrial maintenance
and
trouble-shoot-
ing, general waveform analysis, adjustment of
radio
receivers
and
transmitters, square-wave
and
general
testing of audio equipment, peak-to-peak voltage
measurements,
and
observation of
vacuum-tube
characteristics.
The
WO-33A is a versatile
and
re-
liable instrument, well suited to applications
which
require a
dependable
oscilloscope.
Specifications
NOTE:
Performance
figures
are
for
a line
voltage
of 117
volts,
60
cps.
Frequency
Response:
Electrical
Vertical Amplifier:
Wide-Band Positions (5.5 cps to 5.5
Mc)
..................................................... flat within - 3
db
High-Sensitivity Positions:
20
cps
to
150
Kc
..................................................... .
3 cps to 1.5 Mc .................................................... .
Horizontal Amplifier (3.5 cps to 350 Kc)
Deflection
Sensitivity:
Vertical Amplifier:
At
V
INPUT
connector .......................................
With
WG-349A Blue
Lead
With WG-349A
Yellow
Lead
..............
(Wide-Band)
Positions
rms
p-p
0.10
0.3
0.10
0.3
1.0
3.0
. ..... flat within - 3
db
flat within - 6 db
.... flat within - 6 db
(High-Sensitivity)
Positions
rms
p-p
.003
0.01
volt/in
.003
0.01
volt/in
.03
0.1
volt/in
Horizontal Amplifier
(at H INPUT
terminal)
Rise
Time
(Vertical Amplifier):
.......................................................................................... 0.9
rn1S
volt/in
5.5-Me
Positions
0.1 psec
Input
Resistance
and
Capacitance:
Vertical Amplifier:
At V INPUT
connector ......................... ................. ............... ...................... 1 megohm shunted by approx. 50
f.Lpf
With
WG-349A Blue Lead ...................... ....... ........ ........ ......
...
...
...... 1 megohm shunted by apf)fox. 90
f.Lf.L
f
\Vith \VG-349A Yellow
Lead
.................... . ................................. 10 megohms shunted by
ap~rox.
10
pf.Lf
Horizontal Amplifier
(at H INPUT
terminal) .................................................... . .....
io
megohms
EXT
SYNC
Input
Terminal........................ . .................................................................... 250 K to 55 K
Sweep
Oscillator:
Frequency Range (continuously adjustable)
Sync ................................... .
Sync
Range.
Maximum
AC
Input
Voltage
(at
Lo-Cap
Probe):
(In
presence of 400 volts
dc)
............................ .
Phase-Control
Range
.............................................. .
Power
Requirements:
Voltage ....
Average
Power Consumption .................................... .
1-6BR8
1-6BK7A
Tube
Complement
2-12AT7
Height
Width
1-6X4
Mechanical
8
31f1
14
6
1111
12
• 5 •
Length
Weight
15 cps to 75
Kc
........................ External; ± Internal
...
To
4.5 Mc
.....
600 p-p volts
o to 160 degrees
105-125 volts, 50-60 cps
. ...........
50 watts
1-6C4
1-3AQPl
.......
lOW'
14 lbs
Functions
of
Controls and Terminals
o 0 0 0
E;)a=JE;)
00
00
OFF-INTENSITY - Applies
power
to
the
instrument
and
in-
creases intensity of
the
trace
on
the
screen of
the
cathode-ray
tube
when
control
is
turned
clockwise
from
"OFF"
position.
FOCUS - Adjusts
the
sharpness
of
the
trace. Normally requires
adjustment
when
setting
of
the
INTENSITY
control is
changed.
000
0
o 0 0 0
v
POS
- Adjusts vertical posi-
tion of trace.
H
POS
- Adjusts horizontal po-
sition of trace.
o
000
• 6 •
V-CAL - Adjusts sensitivity, or
calibrates vertical amplifier to correspond with positions on V
RANGE switch.
°n°
O~O
000
0
E;)c=~
00
00
00
00
V RANGE -
In
"CAL"
position,
disconnects vertical amplifier from
input
connector,
and
supplies a
calibrating voltage which should
be
adjusted
with "V-CAL" control
to
full-screen deflection. Adjusts overall sensitivity of vertical amplifier
in
"3-to-l"
steps. Automatically
changes
bandwidth
of vertical amplifier when going
from ".2" to ".6" positions.
V INPUT -
Feeds
the
input sig-
nal to
the
vertical amplifier through
the
attenuator
circuits.
:0:
000
°
&c=
~
'lac
00
SYNC - Selects the source of
the
synchronizing signal.
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RCA
WO-33A Cathode-Ray Oscilloscope iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
:0:
o~/=o~o
~c
00
GND - Connected directly to case
and
chassis.
H/SWEEP
SEL
- Selects
the
frequency
range
of
the
sweep
os-
cillator.
Used
in conjunction with
the
SWEEP
VERNIER
control.
Also switches
the
Horizontal Amp-
Mer
to
"H
INPUT"
or to a sinewave sweep voltage of power-line
frequency.
0(jJ}0
o 0
000
00
00
SYNC/PHASE - Controls
the
amplitude
of
the
synchronizing
voltage applied to
the
grid of
the
sweep oscillator; should
be
adjusted
to minimum setting necessary to
lock
pattern
in a stationary position.
Works zero-center for internal
sync. Adjusts external sync by reg-
ular clockwise rotation. Also controls phase of
the
sinusoidal
sweep
voltage
when
the
H/SWEEP
SEL
switch is in
the
"LINE"
position.
• 7 •
:0:
EXT
SYNC/H
INPUT
- An
external synchronizing signal for
the
sweep
oscillator should
be
con-
nected
between
this terminal
and
the
ground
terminal.
The
"SYNC"
switch should
be
set to "EXT". An
external signal for the horizontal
amplifier should also be connected
between this terminal
and
the
ground terminal
and
the
H/SWEEP
SEL
control set to
"H
IN". A positive-
going signal will cause
the
spot to deflect to
the
right; a negative-going signal will cause
the
spot to
deflect to
the
left.
SWEEP
VERNIER - Provides
continuous control of
the
oscillator
sweep frequency over
the
range
selected by
the
SWEEP
controL
Also provides overlap
of
the
SWEEP
control positions.
0QO
o 0
000
0Q
o 0
000
H GAIN - Adjusts
the
gain of
the
horizontal amplifier
and
varies
the
width
of
the
horizontal trace.
Does not provide
enough
control
to
reduce
trace length to zero.
Operation
To
become familiar with
the
operation of
the
WO-33A Oscilloscope, it
is
recommended
that
the
operator follow
the
procedure outlined below in
the
order
given.
The
section "Function of Controls
and
Terminals" on pages 6
and
7 of
the
block diagram
on
page
20 will also
be
helpful.
Initial
Procedure
1.
Connect
the
power
cord
at
the
rear
of
the
instrument to
an
ac
outlet supplying 105-125 volts
at
50-60 cps.
2.
Turn
the
INTENSITY
control clockwise from
the
"OFF"
position
and
wait a
few
seconds for
the
instrument to
warm
up.
3. Rotate
the
INTENSITY
control farther clock-
wise
until, either a spot or a horizontal line appears
on
the
screen.
The
spot or line should increase in
brilliance as
the
control
is
turned
clockwise.
NQTE:
Do
not allow a small spot of high brilliance to remain
stationary on
the
screen for
an
appreciable length of
time because
discoloratiol'l or
burning
of
the
screen
may
result.
4. Adjust
the
FOCUS
control for
an
image of
maximum sharpness.
5.
Turn
the
H/SWEEP
SEL
control to
the
"H-
IN"
position.
In
this position,
without
an
external
signal
being
applied
to
the
H-INPUT
terminals, no
sweep
voltage,
appears
at
the
horizontal-deflecting
electrodes of
the
cathode-ray
tube
and,
therefore,
only a spot will appea'r on
the
screen,
6.
Position
the
spot in
the
center
of
the
screen
by
adjusting
the
V POS
and
H POS controls.
Vertical-Amplifier
Operation
1. Connect
the
WG-349A
probe
connector to
the
V
INPUT
connector, Set
the V RANGE
control
to
"CAL".
The
screen should
now
display a vertical
trace, indicating
that
a signal has
been
applied to
the
vertical-deflecting electrodes of
the
cathode-ray
tube.
2.
Change
the
height
of
the
vertical trace
by
rotating
the V CAL
control.
3.
Set
the
H/SWEEP
SEL
to
the
dot
between
15
and
150.
• 8 •
4. Lock in as described
under
"Sweep Oscillator
Operation"
.
Horizontal-Amplifier
Operation
1.
Apply an ac signal of from 1 to 3 volts to
the
EXT
SYNC/H
INPUT
terminal. An audio-frequency
generator
or
a 60-cps line signal
may
be
used
as
the
source.
Set
the
HJSWEEP
SEL
to
"H
IN", set
the
V RANGE control
to
60,
and
set
the
H GAIN
control fully clockwise. A horizontal line will appear
on
the
screen, indicating
that
an
external signal has
been applied to
the
horizontal-deflecting electrodes
of
the
cathode-ray
tube.
2. Disconnect
the
lead
from
the
voltage source.
The
horizontal line will
be
replaced
by
a spot.
3.
Tum
the
H/SWEEP
SEL
to
the
"LINE"
position. A horizontal line should appear. NOTE:
When
the
H/SWEEP
SEL
switch
is
set
to the
"LINE"
position,
part
of
the
power-line signal
is
fed internally to
the
horizontal amplifier, providing a
sinusoidal horizontal-deflection voltage of power-line
frequency.
The
SYNC/PHASE
control can
be
nsed
to adjust
the
phase
of
the
internal sinusoidal sweep.
4.
Turn
the
H/SWEEP
SEL
control
to
any of
the sweep positions.
The
sawtooth
output
from
the
sweep oscillator is
applied
internally to the horizontal
amplifier
and
a linear horizontal trace appears on
the screen.
Sweep-Oscillator
Operation
1.
Adjust
the
H/SWEEP
SEL
and
the
SWEEP
VERNIER control to give a sweep of approximately
power-line frequency. Connect
the
ground lead
from the WG-349A
to
the
ground side
of
an
ac-voltage source. An audio-frequency generator or
a power-line signal can
be
used as a source. With
the cable connector of
the
WG-349A
attached
to the
V
INPUT
connector of
the
WO-33A, connect the
blue lead to the
other
side of
the
low-voltage source.
Adjust
the
SWEEP
VERNIER
control for a single
cycle on
the
oscilloscope screen. Rotate
the
SYNC/
PHASE
control
and
note
that
it
should
be
adjusted
to a minimum position neeessary to lock
pattern
in
a stationary position.
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..
RCA WO-33A Cathode-Ray Oscilloscope
2.
With
a single
pattern
on
the
scr~n,
notice
whether
the
pattern
drifts across
the
face of
the
tube.
Horizontal
drift
indicates
that
the
SYNC/PHASE
control should
be
rotated toward its clockwise or
counterclockwise limits or
that
the
SWEEP
VERN-
IER
control
should
be
adjusted until
the
waveform
is locked in.
3.
Connect
the
WG-349A connector to an external
signal of a different frequency.
4.
Set
the
H/SWEEP
SEL
control to «H
IN"
and
adjust
the
H/SWEEP
and
SWEEP
VERNIER controls to produce a suitable sweep frequency. Apply
a synchronizing voltage from the external signal to
the
EXT
SYNC terminal. Set
the
SYNC switch to
"EXT".' Adjust
the
SYNC/PHASE control until
the
pattern locks
in
on
the
oscilloscope screen.
Figure
1.
WG-349A
direet/low-capacitance
probe
and
cable
supplied
with
WO-llA
Use
of
the
WG-349A
Direct/Low-Capacitance
Probe
The WG-349A Direct/Low-Capacitance Probe and
Cable is
designed
especially for use with
the
WO-
33A Oscilloscope. This single-unit probe
is
equipped
with two clips
from
the
probe
housing which permits
using
the
probe
for direct measurements or for
connecting a built-in high-impedance network in
series
with
the
test
point
and
the
probe cable. When
the
yellow lead is used,
the
input capacitance of
the
cable
and
scope is reduced to 10
/L/Lf
and
the ,input
resistance
is
raised to 10 megohms. These high-im-
peda'1ce characteristics permit use of
the
WO-33A
in
high-impedance circuits, such as those found in
TV sync-separator
and
video-amplifier stages, which
would
not
operate
properly if loaded down
by
a
conventional
scope
probe
and
cable.
Whenever
the
probe
is
used in its low-capacitance
position, however,
the
signal
is
attenuated by a
factor of ten. Therefore,
when
voltage measurements
• 9 •
Figure
2.
WO·llA
graph
screen
with
voltage
scales
are made,
the
indicated voltage should
be
multiplied
by 10.
Calibration
and
Voltage
Measurement
Special facilities
on
the
WO-33A provide for
simple
and
quick voltage calibration of
the
vertical
amplifier
and
the'
cathode-ray
tube
screen.
When
the
oscilloscope has
been
calibrated as indicated be-
low,
the
graph-screen scales can
be
used to measure
the
deflection amplitude of a displayed waveshape
directly
in
volts.
The
green-graph screen has two vertical scales, as
shown
in' Figure 2.
The
scale used depends
upon
the setting
of
the
V RANGE control.
Calibration
is
accomplished as follows:
1.
Set
the
V RANGE control to "CAL".
2. Adjust
the
V POS
and V CAL
controls for
enough vertical deflection to fill
the
graph
screen
between
the
two horizontal lines indicated
by
the
"CAL" arrow on the side of
the
graph screen.
The
WO-33A
is
now calibrated.
When
the
V RANGE control
is
set to "CAL",
the
probe, cable,
and
input attenuator circuits in
the
scope are automatically disconnected from
the
verti-
cal amplifier
and
an internal calibrating voltage is
applied.
The
H/SWEEP
SEL
control
may
be
set to
any position during calibration. A straight vertical
line
is
obtained by setting this control to
"H
IN",
A sinusoidal waveshape
is
obtained
when
the
HI
SWEEP
SEL
is
set to any other position.
oOiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
RCA WO-33A Cathode-Ray Oscilloscope
Calibration
will
hold
for
both
the
wide
band
and
narrow
bandwidth
positions. After calibration,
an
input
signal
may
be
read
directly in peak-to-peak
volts
by
measuring
the
vertical deflection against
the
correct
graph-screen
scale.
Example:
It
is desired
to
simultaneously display
and
measure
the
peak-to-peak voltage
amplitude
of
the
horizontal
driving
pulse
at
the
grid
pin
of
the
horizontal-deflection-output stage in a
TV
receiver.
Procedure
is as follows:
1. Set
the
bandwidth
control to
"CAL"
and
set
the
H/SWEEP
SEL
to
"H
IN".
2.
Adjust
the V CAL
control for exactly full
scale vertical deflection as
measured
on
the
graph
screen.
Adjust
the
V POS control so
that
the
bottom
of
the
trace
rests
on
the
base-scale line
and
the
top
of
the
trace
rests
on
the
upper
horizontal line.
3.
The
WO-33A
is
now
calibrated.
4.
Connect
the
ground
lead
from
the
WG-349A
to
the
TV
chassis.
Connect
the
blue
probe
clip to
the
appropriate
tube-socket pin.
5.
Set
the V RANGE
control to a position which
gives
the
desired on-screen deflection of
the
wave-
shape.
6. Lock in
the
waveshape
as
described
under
"Sweep Oscillator
Operation".
7. Adjust
the V POS
control to position
the
bottom
of
the
trace
on
the
graph-screen
base
line.
8.
Read
the
peak-to-peak
voltage
amplitude
of
the
waveshape
from
the
appropriate
scale on
the
graph-
screen.
The
peak-to-peak
voltage
is
read
from
the
scale
point
opposite
the
top
of
the
waveshape.
NOTE:
If
the
WG-349A
is
used
in its low-capaci-
tance position,
an
attenuation
factor of
10
is
intro-
duced
and
it
will, therefore,
be
necessary
to
multiply
the voltage
reading
by
10 to
obtain
the
correct
peak-to-peak voltage
amplitude.
• 10 •
Applications
Successful servICIng
and
maintenance
of black-
and-white
and
color-television receivers requires
special techniques,
not
usually
employed
in
the
serv-
icing of
other
electronic
equipment.
The
general
complexity
and
variety of circuits
used
in
modem
television receivers requires a
great
deal
of
knowl-
edge
on
the
part
of
the
service technician
and
de-
mands
that
test
equipment
be
used
properly.
The
oscilloscope is
of
especial importance in
the
servicing of color receivers. A good television-service
oscilloscope,
such
as
the
RCA WO-33A, may
be
u5ed in signal
tracing
in every section
of
the
receiver;
the
'scope
may
also
be
used
for
making
peak-to-peak
voltage measurements in such
important
sections of
the receiver as
the
sync
and
deflection circuits
and
in the video, chrominance,
and
luminance sections
of color-TV receivers.
In
alignment work, where
video, chrominance,
and
luminance circuit adjust-
ments must
be
made
to
produce
the
desired wave-
shape,
the
oscilloscope is indispensable.
The
WO-33A
may
be
used
in
all
these
applications.
Signal-tracing
means
tracing
the
television signal
through various sections of
the
television receiver
to
determine
how
circuits
are
functioning in terms
of
the
shape
and
voltage value of
the
waveform. As
the signal passes from one stage
to
another
in
the
receiver,
the
shape
of
the
waveform
may
be altered,
Fi9ure
3.
Horizontal-sync
pulse
in
composite
signal
Fi9ure
4.
Vertical-sync
pulse
In
composite
signal
•
11
•
and
the
height,
or
voltage
amplitude
of
the
wave-
form may be changed.
Whenever
possible,
the
WG-349A probe should
be
used
in
the
"LOW
CAP" position for signal tracing
the
video amplifier
and
chrominance circuits because of
the
low
input
capacitance and
consequent
negligible
loading
of
the
circuit
under
test.
When
the
WO-33A is
calibrated
as described
under
"Operation",
it
is possible to
simultaneously
read
the
voltage value
and
observe
the
shape
of
the
waveform.
The
process
of
signal
tracing
is
thus
speeded
up
and
it
is
possible
to
as-
certain a circuit condition quickly.
NOTE:
The
applications described
here
apply
both
to
color
and
to black-and-white receivers.
Analyzing
C~mposite
Television
Waveforms
Probably
the
most important waveform
encounter-
ed
in television service work
is
the
composite video
waveform consisting of
the
video signal,
the
blanking
pedestals,
and
the
sync pulses.
Photographs
of
the
composite video signal
are
shown in
Figures 3 and
4.
The
photographs
are
oscilloscope traces,
and
show
what
the composite video signal looks like as
it
pro-
ceeds through
the
video amplifier of a television
receiver.
The
television service technician should
devote
some time to
the
study
of such waveforms
by
setting
up
a television receiver known to
be
in
goodoper-
ating
condition
and
noting
the
waveforms
on
the
WO-33A
at
various points in
the
video amplifier.
Traces similar to those shown in Figures 3
and
4
may
be
obtained
on
the
WO-33A as follows:
(Continued on page 14)
NORMAL
fl,
..
SYNC
PULSE
J •
SYNC
PULSE
~
COMPRESSION
CAUSED
BY
JJ
LIMITING
'it'
"WHITE"
'l
SATURATION
CAUSED
BY
LIMITING
~
Figure 5. Sync-pulse
compression
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NOTES
ALL
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IN
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UNLESS
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ALL
RESISTQRS
IN
OHMS.
ALL
VQLTAGES POSIT!
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AND
MEASURED
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S-I
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IN
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POSITIQN
.INSTRUMENTS
'WITH
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NO:S
fOOl
THRU
2300
HAVE
TWO. .0.01 MF
DISC
CAPACITORS
BETWEEN
THE
AC
LINE
AND
C1\SE
GROUND
V
RANGE
FULL 'SCALE VOLTS (p-p)
S-I
PQSIT
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RANGE
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•
Schematic Dia9ram
ef
WO-33A and
WO.l3A(K)
•
TRAD(-MARK
"VOLTOHMYST"
REG.
u.s.
PAT.
OFF.
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iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
RCA W0-33A Cathode-Ray Oscilloscope
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
NORMAL
CIRCUIT
HORIZONTAL
OVERALL
FREQUENCY
EFFECT
ON
HORIZONTAL
FAULT
PULSE
RESPONSE OF
PICTURE
PULSE
DISTORTION
RECEIVER
J\
V
1
NORMAL
PICTURE
CIRCUIT
~
NORMAL
r-
1\
LOSS
OF
HIGH
A.
~
LOSS
OF
FREQUENCIES
--.I
PICTURE
DETAIL
I--
EXCESSIVE
J)
V
FINE
VERTICAL
HIGH
- FREQUENCY
BLACK
& WHITE
RESPONSE,
STRIATIONS
FQL-
NON-LINEAR
LOW I
NG
A SHARP
PHASE
SHIFT
--l
"'-
CHANGE
IN
PIC-
TURE
SHADING
LOSS
OF
LOW
CHANGE
IN
SHA-
FREQUENCIES
1\
V
1
DING
OF
LARGE
(IN
THE
RANGE
PICTURE
AREAS;
ABOVE
15
OR
-
I-"'-
SMEARED
PIC-
20
KC)
TURE.
PICTURE
SOUND
CARRIER
CARRIER
Figure
6.
Sync-pulse
distortion
(Continued
from
page 11)
1.
Tune
the
television receiver to a television
signal.
2. Rotate
the
INTENSITY
control on
the
WO-33A
clockwise.
Set
the
SYNC control
to
"INT". Set
the
INTENSITY
and
FOCUS
controls for
the
desiredof
brightness
and
best
focus.
3.
Connect
the
WG-349A
probe
and
cable con-
nector to
the V INPUT
connector. Connect
the
ground
lead
to
the
receiver chassis. Connect
the
yellow
probe
clip to
the
grid terminal of the picture
tube
socket.
It
is
not
necessary
that
the
picture
tube
be
connected
for this test.
4. Set
the V RANGE
switch
and
the
V CAL
control for a
pattern
of convenient height.
5.
To
obtain
the
horizontal-sync pulse on the WO-
33A screen, set
the
H/SWEEP
SEL
control to
the
1500 • 15 Kc position. Adjust
the
SYNC/PHASE
control, if necessary, to
obtain
lock-in on
the
sync
pulse,
and
adjust
the
SWEEP
VERNIER
control
so
that
two
complete
waveforms
appear
on the
screen. To obtain
the
vertical-sync pulse, set the
HI
SWEEP
SEL
to
the
15
• 150 position. Readjust the
SWEEP
VERNIER
for two complete waveforms.
The
pulses should resemble those
shown
in
Figures
3
and
4.
Alignment
The
process of television-receiver alignment
probably requires a greater
amount
of skill
and
understanding on
the
part
of
the
service technician
than
does any
other
service function. Before
under-
taking alignment,
it
is
important
that
the
technician
recognize
the
symptoms of a misaligned receiver.
The
order in which various sections of the tele-
vision receiver
are
aligned may differ
between
split-
channel sound
and
intercarrier types. Different re-
ceivers of one system may also differ in
the
order
of alignment.
In
all cases, however,
the
alignment
order given
by
the
manufacturer in his service notes
should
be
followed.
For
these reasons, it
is
not feasible to present a
general alignment procedure applicable to all receivers. Some general precautions
and
suggestions
for using
the
WO-33A Oscilloscope, however,
are
provided below to aid
the
television technician in
servicing a receiver.
• 14 •
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii RCA WO-33A Cathode-Ray Oscilloscope iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
Receiver alignment requires, in addition to
the
WO-33A, a sweep generator, a marker generator of
crystal accuracy,
and a vacuum-tube
voltmeter.
An
RCA
WR-59
or WR-69-series Sweep Generator, an
RCA WR-39, WR-99 or
WR-89
Calibrator,
and
an
RCA VoltOhmyst"', such as
the
WV-77, \VV-87,
WV-97,
or
WV-98 are recommended.
Tuner
Alignment
-
When
preparing
for
tuner
alignment,
the
manufacturer's recommendations
should
be
followed closely.
If
the
tuner
has test
points for connecting
equipment,
the
test
points
should
be
used.
The
oscilloscope test point is usually
connected internally to
the
mixer grid circuit
where
a
demodulated
signal is present.
The
output
cable of
the
sweep generator should
be
connected
to
the
antenna
input
connectors.
The
ground
lead
of
the W 0-33A
should
be
clipped
directly
to
the
tuner
shield to minimize
hum
pickup
on
the
sweep
trace,
and
the
WG-349A blue clip
should
be
connected to
the
mixer grid -circuit test
point.
If
no
test point
is
provided,
the
WG-349A
may usually
be
connected to
the
grid circuit through
a 5,000
to
10,000-ohm composition resistor.
It
is
important
that
the
WG-349A
be
connected
directly to
the
proper test point or, if a series resistor
is
used,
that
the
lead
length
between
the
probe
clip
and
the
mixer grid circuit
be
kept
as short as
possible
to
prevent
hum
pickup
and
possible dis-
tortion of
the
tuner
curve
on
the
WO-33A.
Hum
pickup is evidenced
by
twisting of
the
base line
when
return-trace blanking is used on
the
sweep
generator. This precaution
is
necessary because of
the
high-gain level
at
which
the
WO-33A is operated
for
tuner
alignment.
The
INTENSITY
control should
be
turned
clock-
wise to
obtain
a trace of suitable brilliance.
The
vertical
gain
controls should
be
set for maximum or
near
maximum gain.
The
output
from
the
sweep
generator
and
marker calibrator should
be
set
at
a
low level to avoid over-loading
the
TV
receiver,
distortion of
the
sweep curve,
and
an
erroneous
picture
of alignment on
the
oscilloscope screen.
When
the
WO-33A
is
used
with
a sweep generator,
it is
important
that
the
two instruments
be
adjusted
so
that
blanking is correct
and
the
sweep of both
instruments
is
in phase.
If
the
phase
adjustment
is
not
properly
set before starting alignment,
the
sweep
0Trade Mark "VoltOlunyst" Reg.
U.
S.
Pat.
Off.
Fi9ure 7. Double
rf-response
curve
caused
by
improper
settinq
of
phasin9
control.
No
blanking used
Figure 8.
Sharp'
cutoff
of
response
curve
and
misplaced
base
line with blanking
indicate
improper
settin9
of phasin9
control
Figure
9.
Typical
rf-response
curve
curve on
the
oscilloscope
may
be
prematurely
cut
off or
the
curve
may
appear
as a double or
"minor"
image.
These
effects, shown in Figures 7 and 8,
are
sometimes misinterpreted
as
being caused by mal-
functioning of test
equipment
although they
may
often
be
traced
to improper
tuner
alignment.
The
sweep generator may use either a sinusoidal
or sawtooth sweep' of line frequency.
If
a sinu-
soidal line-frequency sweep
is
used,
the
WO-33A
may
be
driven
internally
by
setting
the
H/SWEEP
SEL control to
"LINE".
If
a sawtooth sweep
is
used,
the sweep generator deflection signal may
pe fed
to
the H INPUT
terminal of
the
\i\10-33A.
The
H/SWEEP
SEL
should
be
set to
"H
IN". An internal
sawtooth sweep may also
be
obtained by setting
the
H/SWEEP
SEL
to
the
15 • 150 position.
•
15
•
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RCA WO-33A Cathode-Ray Oscilloscope
;;;;;;;;;iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
If
no
blanking
is
used,
the
SYNC/PHASE control
should
be
adjusted until
the
two response curves
coincide on the oscilloscope screen.
If
blanking
is
used, the SYNC/PHASE control should be adjusted
until
the
base line
on
the
WO-33A screen extends
the full width of the curve trace. An extremely sharp
drop-off point on
the
response curve, which gives a
"chopped-off" appearance to
the
trace short of the
end
of its sweep range, also indicates improper
phasing.
When
a marker is superimposed on the
response curve, improper phasing will cause two
markers to appear
on
the
curve.
The
SYNC/PHASE
control should be adjusted to obtain
the
appearance
of a single trace having only one marker.
The
setting
of the
SYNC/PHASE control is also important dur-
ing sweep alignment of
other
sections of the receiver.
Serious misalignment of
the
tuner
or considerable
difficulty or failure
in
alignment may
be
caused by
an unsuspected defective component.
If
proper
alignment procedure fails
to
produce correct tuner
curves,
the
technician should check individual com-
ponents in the rf unit.
Picture-IF
Alignment
-
To
obtain
an
over-all
picture-if response curve,
the
blue
clip of
the
WG-
349A probe should
be
connected across either the
second detector load resistor or to
the
grid of the
first video stage; test points which
can
provide a
demodulated signal to
the
oscilloscope.
The
ground
lead should be connected to
the
chassis. Because of
the additional amplification in this section of
the
receiver,
the
oscilloscope gain should
be
considerably
reduced,
but
not to.
the
point
where
it
is
necessary
to increase sweep-generator output.
Depending upon manufacturer's recommendations,
it may
be
necessary to adjust
the
agc
bias level, either
through temporary wiring changes or by providing
fixed battery bias.
The
service-notes should
be
followed closely because alignment procedure may
involve considerable detail.
Trap
alignment is some-
times difficult because
the
marker disappears in the
trap notch. This may often
be
overcome by magnify-
ing
the
trap
section of
the
trace with the V CAL
and
H GAIN controls.
Adjustment of
the
SYNC/PHASE control
is
also
important when aligning
the
i-f sections of the re-
ceiver.
The
precautions
and
recommendations de-
scribed
under
the section
on
tuner
alignment, above,
should
be
observed here. Controls on the WO-33A
should
be
set the same
as
for tuner alignment ex-
cept
that
less vertical gain will be required.
For observation of the response of individual
stages in
the
picture-if amplifier,
the
WG-350A
Demodulator Probeo should
be
used. This
is
a high-
frequency rectifying-type probe.
It
is
important
that
this probe
be
used properly
and
in accordance with
service-note recommendations to prevent distortion
of
the response curve and an erroneous picture of
alignment.
The
WG-350A, which connects to
the V INPUT
of the WO-33A,
is
equipped with a short
ground
lead
and
clip. For alignment work,
the
ground clip
of the probe should always
be
connected to
ground
near
the
test point being used for
the
WG-350A.
When the
WG-350A
is
used to check individual
stages, it should be connected on the
output
side of
the stage being adjusted.
For
example, if
the
align-
ment of a coupling transformer is to
be
checked,
the
probe should
be
connected to the
plate
of
the
tube
which
has
its grid coupled to the transformer.
The
tube thus acts as a buffer between
the
high-imped-
ance grid circuit
and
the probe.
For general signal-tracing work, the probe may
be
moved from grid to grid throughout
the
i-f amplifier.
Figure 10. (A)
Ratio-detector
curve
and
(8)
sound-if
curve
Sound-IF
and
Detector
Alignment
- Most
television receivers use either a discriminator or ratio
detector.
For
either type, the WG-349A probe clip
should
be
connected to the output
of
the
sound
detector. F or detector alignment,
the
sweep
and
marker generators should be connected to the receiver
as
described in the service notes. An S-shaped
curve, similar to that shown in Figure lOA, should
be
obtained on
the
oscilloscope screen.
The
setting of
controls on
the
WO-33A should remain the same as
before. A typical sound-if curve
is
shown in
Figure
° Available on separate order.
• 16 •
;;;;;;;;;iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
RCA WO-33A Cathode-Ray Oscilloscope
;;;;;;;;;iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
INCORRECT
INCORRECT
CORRECT
Figure 11. Horizontal-oscillator
waveforms
lOB.
To
obtain
the
sound-if response curve, the
probe should
be
connected to either
the
grid-return
of
the
limiter stage or to the grid-return of the last
sound-if stage.
The
SYNC/PHASE control should be
set no farther clockwise than necessary to lock in
the waveshape.
Horizontal-Oscillator
Adjustment
-
The
WO-33A is well suited to adjustment of
the
hori-
zontaloscillator
and
may be used
as
follows:
Set
the
WSWEEP
SEL control to
the
1500 •
15 Kc position.
HORIZ.
HOLD
CONTROL
Adjust the SYNC/PHASE control to give stable
lock-in of the waveshape, if necessary.
With the ground lead connected to
the
receiver
chassis, connect
the
yellow clip of
the
WG-349A
to the output of
the
horizontal oscillator, as described
in the service notes. Connection to a typical horizontal-oscillator circuit is shown in
Figure
12. Because
the horizontal oscillator
is
a high-impedance circuit,
the low-capacitance clip should always
be
used to
reduce capacitance-resistance loading effects. Usually
it
is
necessary to adjust
the
oscillator for suitable
output waveshape. Typical horizontal-oscillator
waveshapes which
can
be
observed on
the
WO-33A
are shown in
Figure
13.
Sync-Separator·
Waveshape
- To observe
waveshapes in
the
sync-separator stage, the low-
cap yellow clip should
be
used. Controls of the
WO-33A should
be
set the same as for observation
of the horizontal waveform.
The
probe clip should
be connected to
the
plate of the sync separator or
to the plate or grid of
the
sync amplifier.
WG
-349A
USE
LOW'CAP
YELLOW
CLIP
HORIZ.OSC.
TRANS.
S-----I
.--------<~
tt
\
FROM
....I-----k
I
SYNC.
AMP. TO
HORIZ.
H 0 R I
Z.
..-----<>---H--+---------40
1.....,...,4-+.4~.....,...)("")(""'IrI:
........
___4_
0 U T
PUT
LOCKING
STAGE
RANGE
CONTROL
I I
Figure 12. Adiustment
of
horizontal oscillator
• 17 •
WO-33A
o
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Figure 13. Color.TV signals
as
displayed
by
WO·33A. (A) Com.
posite
eolor·TV signal.
Color-burst
ean
be
seen
to
left
of
syne
pulse. (B)
Output
signal from RCA WR-61A Color-Bar
Generator
showing color-sync pulses
and
10
color-bar
pulses.
General Applications
Square-
Wave
Testing
of
Audio
Amplifiers
The
use of square waves for testing
the
characteristics of audio equipment has distinct advantages
over other methods. A square-wave generator
and
the
WO-33A Oscilloscope,
when
set
up
as shown
in
Figure 14,
can
provide a quick
and
accurate means
of checking
an
amplifier
and
its adjustments.
In
this
test setup, it
is possible
to
check simultaneously the
amplitude, phase,
and
frequency characteristics of
the
amplifier.
The
value of
the
load resistance used depends
upon
the
output
impedance of
the
amplifier.
It
is
important
that
the
correct value
be
used.
For
an
over-all check of amplifier response,
the
WO-33A
should
be
connected directly across
the
load re-
sistance, as shown.
It
is desirable to employ square waves of
at
least
two fundamental frequencies.
The
lowest funda-
mental frequency should
be
equal to approximately
ten times
the
low-frequency limit of the amplifier
being tested. A 100-cycle square wave should serve
to check response from a few cycles to over
1000.
If
a square wave having a fundamental frequency
of 2 Kc
is
used,
the
amplifier may be checked
through
the balance of
the
audible range.
The square-wave generator should be set to
the
proper frequency
and
connected to
the
regular
input
terminal of
the
amplifier.
The
WO-33A
may
be
connected temporarily directly across the generator
for a reference check of
the
waveform.
The
WO-
33A may
then
be
connected to various points
in
the
amplifier to determine how each stage
is
functioning.
The effect of various adjustments may be seen
on
the screen.
Care should
be
taken to prevent too large a signal
from
the
square-wave generator from overloading
the amplifier
and
causing distortion of the
square
wave.
Phase-Shift
Measurements
To measure
the
phase shift of an audio network,
apply a sine
wave to the circuit
under
test
and
con-
nect
the
direct
probe
to
the
output
terminal of
the
network. This test signal should also be fed to
the
oscilloscope
through
the H INPUT
and
GND
terminals. Set
the
H/SWEEP
SEL
control to
the
"H
IN" position.
If
no phase shift exists, a sloping
straight line will appear.
Phase shift is indicated as
an elliptical or circular trace.
The
method of calcu-
lating
the
degree of phase shift is shown graphically
in Figure 16.
SQUARE-
WAVE
GENERATOR
AUDIO
AMPLIFIER
LOAD
YELLOW
NOT
USED
WG-349A
FICJure
14.
Audio amplifier
test
setup
• 18 •
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/
/
NO
AMPLITUDE
DISTORTION
AMPLITUDE
DISTORTION
NO
PHASE
SHIFT
NO
PHASE
SHIFT
C
0
NO
AMPLITUDE
DISTORTION
AMPLITUDE
DISTORTION
PHASE
SHIFl
PHASE
SHIFT
Figure 15. Distortion
and
phase. shift
in
audio amplifier
Frequency
Measurements
Two methods may be used to determine fre-
quency.
In
one method, a sine wave of known
frequency is applied to the H
INPUT
terminal and
the
H/SWEEP
SEL
is
set to
"H
IN".
The
unknown
signal is fed to the
V
INPUT
terminal.
The
re-
sulting
pattern,
or Lissajous figure, indicates the
ratio
between
the two frequencies. Typical Lissajous
figures
are
shown in Figure 17.
In
the
other method of frequency measurement,
the
H/SWEEP
SEL
should
be
set
at
"LINE"
to
provide a sweep of line frequency.
The
signal of
unknown frequency should be applied to the
V
INPUT
terminal.
If
a stationary pattern
is
obtained
on the oscilloscope screen,
the
frequency of the input
signal
must
be
equal to, a submultiple of, or a
multiple of
the
line frequency.
..
19 •
r
A
SINE
cp
= ~ •
[
WHERE
cp
= PHASE
ANGLE
0
Figure 16.
Measurement
of
phase
shift
UNKNOWN
FREQUENCY
ON
VERTICAL
ELECTRODES;
STANDARD
FREQUENCY
ON
HORIZONTAL
ELECTRODES
RATIO
OF
UNKNOWN
TO
STANDARD.
D
6:1
Figure 17. Llssalous
fiCJures
PR
ESS
URE
TRANSDUCER
INSERTED
IN
CYLINDER CHAMBER
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iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
VH~RATION
PICKUP
Figure 18. ElIglne-pressure analysis
setup
Industrial Applications
Use
of
the
cathode-ray
oscilloscope
with a few
auxiliary instruments has solved
many
perplexing
problems
both·
in
the
laboratory
and
iu;the
service
shop.
The
important
applications of
the
oscilloscope
are
many. A few
which
serve
to
illustrate
the
wide
range
of possible applications
are
described
below.
Engine-Pressure
Analysis
When
the
WO-33A
is
used
with
auxiliary
equip-
ment
such
as is
shown
in
Figure
18, variations
in
cylinder-head
pressure
developed in
an
intemal-
combustion
engine
or
similar
type
machine
can
be
V INPUT
S-\
V
-\A
-
VERTICAL
~
1/2
6BR8A
ATTENUATOR
VERTICAL
AMPLIFiER
I'
EXT
SYNC / H
INPUT
L
•
V-3
12AT7
~
SWEEP
OSCILLATOR
-I
MACHINERY
OR
EQUIPMENT
UNDER
TEST
"
Figure 19. Vibration analysis
setup
\shown
on
the
oscilloscope screen.
The
oscillosmpe
has proven useful in
the
development
of internal-
combustion engines
when
used
with engine pressure-
measuring devices.
Vibration
Measurements
The
WO-33A
can
also
be
used
with
a piezo-
electric
transducer
or
with
the
RCA type
5734
mechano-electronic
transducer
for measuring vibra-
tion.
Figure
19 shows a typical
setup
for observing
vibration waveforms,
indicating
relative amplitudes
and
other
characteristics
of
vibration
on
the
oscillo-
scope screen.
V-IB
V-2
~
1/2
6BR8A
~
6BK7
VERTICAL
VERTICAL
AMPLIFIER
AMPLIFIER
Ii
V-7
3AQPI
~
INTERNAL
SYNC
CATHODE
RAY
j
I
TUBE
SYNC
J
-
INT
EXT
S-3
Y-4
!-
~
H /
SWEEP
~
12AT7
HORIZONTAL
SEL
r-
AMPLIFIER
r
S-2
+
CALIBRATING
VOLTAGE
V-5
Y-6
6X4
6C4
I--
LOW VOLTAGE
HIGH
VOLTAGE
,
POWER SUPPLY POWER SUPPLY
Figure 20.
Block
Diagram WO-33A
•
20
•
Maintenance
CAUTION :Do not strike or subject the cathoderay tube to more than moderate pressure
as
breakage
of
the tube may result in injury from
Hying
glass. When the case of the instrument is
removed, high voltages are exposed and the
safety precautions outlined on
Page 2 should be
observed.
General
Performance
of
the
WO-33A
depends
upon
the
quality of
the
components employed.
If
it
should
be
necessary
to
replace
any
of
the
component
parts,
only
RCA
replacement
parts
or
equivalents of those
shown
in
the
Replacement·
Farts
List
of this instruc-
tion booklet
should
be
used.
The
chassis
may
be
removed from
the
case
by
removing
two
screws
on
each
side of
the
case,
and
three
screws from
the
bottom
of
the
case.
The
panel
~nd
chassis assembly
may
then
be
pulled forward
and
out
of
the
case.
If
any
alignment
adjustments
are
made,
the
line
voltage
should
be
117 volts
at
50-60 cps.
If
trouble
is
encountered,
voltage readings should
be
taken
and
compared
with
the
operating
voltages shown on
the
schematic
diagram. Conventional trouble-shoot-
ing
techniques
should
be
used
to
locate trouble.
Resistance
and
continuity checks
can
then
be
made
to
isolate
the
defective section
or
stage.
Astigmatism
Adjustment
1.
Turn
on
the
WO-33A
and
allow
at
least 15
minutes
warm-up
time.
2.
Set
the
H/SWEEP
SEL
to
"LINE",
the
band-
width
control
to
"CAL",
and
adjust
the
PHASE,
V
CAL,
and H GAIN·
control· for a circular
pattern
approximately
one
inch
in diameter.
3.
With
a screw -priver,
adjust
potentiometer R-68
for
best
possible focus
at
all points on
the
circle.
R-68 is
located
on
top
of
the
chflssis.
Vertical
Attenuator
Alignment
Alignment
of
the
frequency-compensated.
step-
attenuator
requires
the
use of a square-wave or
clipped
sine-wave signal of
about
1000 cps in
frequency.
1.
Connect
the
blue
clip of
the
WG-349A
probe
and
cable
to
the
square
wave
source.
2.
Set
the V RANGE
switch
to
60.
3. Adjust
the
scope controls so
that
two
square
waves,
about
an
inch high
and
two
inches
wide
are
displayed
on
the
screen.
4. Adjust
C-6 so
that
the
square
waves are Hat-
topped, without overshoot spikes
or
drooping corners.
5. Reset
the V RANGE
control to 20,
and
reset
'.r
the
amplitude of
the
square
wave
generator. Adjust
C-5 as in
"4" above.
6. Repeat this process for
V
RANGE
positions 6
and
2.
The
desired
trimmer
capacitor
can
be
identi-
fied on
the
range
switch
by
touching
it
with
the
finger
and
noting
the
appearance
of a
random
noise signal
on
the
CRT
screen.
7. Now connect
the
square
wave
generator
to
the
yellow clip of
the
WG-349A
probe
and
cable.
With
the
V RANGE control
on
position 2, adjust capacitor
C-l
for a
Hat
top
trace
without
overshoot spikes
or
drooping corners.
Internal
Calibrator
Control
Adjustment
1.
Connect
an
audio oscillator
or
square
wave
generator
to
the
blue
clip of
the
WG-349A
probe
and
cable. Set
the V RANGE
control
to
position 2.
Adjust
the
signal source for full scale deHection
on
the
CRT.
2. Transfer
the
signal source to
the
yellow clip
lead of
the
WG-349A probe,
and
rotate
the
V
RANGE
control
to
position .2,
and
adjust
potentio-
meter
R-l1
for full screen deHection.
RCA
Repair
Service
RCA maintains a complete
repair
service for
the
adjustment, calibration,
and
maintenance
of RCA
test equipment.
If
it
becomes necessary to service
this equipment,
the
report forms enclosed in this
booklet should
be
filled
out
as described.
It
is
im-
portant
that:
1. Test
equipment
be
packed
carefully.
2. A full description
oLthe
trouble
be
included
in
the report.
Attention to these details will
help
prevent
damage
in transit
and
delay in repairs.
•
21
•
SYMBOL
NO.
CI.C:;.c.,
C5. CI.
C2. CI4, CI1,
CII,
C12
C.
C.
C'"
Co,
""
C"
CIS, C21.
Cll
C"
C"
c.
cn
C><
c"
c"
e"
c.
en
c.
c"
Cll.
C)~.
Cl5,
e.,
CUI,
en
ClIA,
Cl9A
ClIB,
cnB
C)8C. C)9C
ClID,
C)7D
CU,
Cll,
Ctl
C<O
"
"
Il.
11.4,
Ril
RS.
R4I,
R51
..
"
..
Rt.R26
...
'"
'"
,,.
RI5,
RI8,
RH, Rli
RI6,
Rll,
III
'"
'"
R20.
R21.
RiI,
RIO
on
'"
R:M
1112
,.
lUI,
R2'I
'"
Rl4, 1ll1, 151,
RSI
,n
'"
,n
,~
,
..
CA'ACITORS
Pcpor
0.1
"f,
±20'1
••
400
V
Coram,c D ..
c,
Z2
~~f,
:t; 5'1..
500
V
C.,amic
Diu:.
"""I.
:t;S'1.,
500
V
Co,amic
Oi,c.
140
""f,
:t;5"/.
500
V
Co,amic
Oi,c,
410
""I.
;t:5'1.,
500
V
Co,amic
Disc,
1500
""f,
;t:5'!..
500
V
C.,amlc
Di,c,
1100
""',
;t:
5'1.,
500
V
Corami,
Oioe,
0.02
"I.
GMV,
.00
V
Cuamic
Diu:.
SW
""I.
;t: 5'1..
500
V
Co,omic
Oioe.
0.05
~f.
;t:2O,.
..
200 V
Popor,
0.05
"f.
;t:2O'1..2OO V
C.,om,c
Oio<.
5
I'"f,
±20'1.,
ISO
V
Coramic
Tubulo"
12
""I.
;t:5,.,.
""
Pop."
0.21
"f, ± 10'1..400 V
Pap.r.
0022
"f,
;t:IO'1..
400
V
C.,amic
Di""
2100
""I.
±
5'1
••
400
V
Co.amic
Diu:.
220
""I,
;t:S"/..400 V
C.ramic
Di,c.
IS
""f,
±S'1..
500
V
Co,amic
D"c,
Ito
""I.
;t: 10"
..
200
V
Co,amic
D"c.
150
""f,
;t:IO%, 200 v
Papo,.
0.1
"I.
;t:20%.
200
V
~Ioclrolyllc:
4 Soclion,
10
"f
+
100%,
- IS"/..
450
V
20
"I, + 100,.
..
-15%.
450
v
20
"f.
+
100'.4.
- 15,..,
450
V
40
"I,
+
100%,
-15'1"
400
V
C.,amlC
Di.c,
0.01
"f,
20,.
..
500
V
Popo" 0
5
~I,
GMV.
1000
V
RESISTORS
Ca,ban
fJlm.
680
K,
';'
W,
5'1.
Ca,ban
f'lm.
910
K,
';'
W,
5,..
Ca,bon
film. I
101,
';' W,
5'1.
Ca,ban
film.
IS
K,
';'
w.
5,..
Ca,ban
f'lm.
410
K.
'/I
W.
5'1
•
Corban
film,
110
K,
';'
w.
5,..
Co,b"n
film.
]3
K,
'f,
W,
5"/.
Ca,bon
fdm.
10
K,
'/>
W,
5,..
Ca,bon
film.
110
K.
'/>
W,
5%
Va'iebl.,
Wi,o
Wound,S
K.
1.5
W,
20,.., Wirt
Typ.
WCl(JI
Campo,il'on,
1,1
K.
I
w.
10%
Carbon
(oilm,
IOC,
'I!
w.
5%
Ca,bon
Film,
12K,
'/I
W,
5%
Compa,ition, I M.
'I.
W.
10'1.
Co,ban
Film,
120.
'I'
w.
5'1.
Compo,illon.4.1
K.
I w.
10"/.
Compo.ilion,
410
K.
I
w.
10%
Ca,ban
film,
210
K,
\I.
w.
5r.
Ca,ban
film,
Bl
K.
'f, W. 5,..
Ca,ban
film,
I.B
K.
I w.
5%
Vo,iablo.
Ca,ban. 5 K,
't.
w.
20'1.
Co,bon
film. I
K.
'/>
W,
5'1.
WIIO
Wo~nd,
2.4
K,
5 W, 5%
IRe Typ.
pW5
Cm!>o,
film.
120
K,
'f,
w.
5'1.
Va,iabl
••
Co,bon. I M.
\II
W.
2Or.
Compa,ilion.
12M.
'h
W,
10%
C.mpa,ilion,
61
K.
'/>
W,
10'1.
Compa,ition.
3.3
K.
'h W,
10'1.
CQ,bon
film.
'".
'/>
W.5'1.
STOCK
NO.
21ms
21~114
21~205
21'2(1j
219201
119116
1001014
21~2Oi
219210
219204
219211
21~212
21j121
219121
2
It
125
21~5"
..
,
'"
,~
,~
,%
..,
SYMBOL
NO.
R4~.
R52
R50.
~5l
'"
ISS,
R540
R5'.
R62
...
..
,
'"
..
,
'"
,.,
,
..
,
..
'"
U2
R24
'"
'"
'"
,n
".
'"
...
"
L2,
L3
"
"
"
"
'"
KID·I
•
22
•
DESCRIPTION
Carbon
f,lm.
100
K. I W.
5'/ •
VO'iob'o! Dual
Corban,
I
101
& 101.',
W.
10,.
'"'
Ca,bon
film,
210
K,
'I>
w.
5'/.
Ca,bon
film.
l~
K,
'J.
W,
5'k
Co,bon
film. 2 1
M.
';' W S,.
Co,bon
Film,
II
M,
'I>
W.
5'
•
Ca,ban
film,
24
K.'{,
W. 5,..
Compo,ilion.
10
M.
';'
W.
10,..
Vo"oblo
Ca,ban.
5(1
K.
'h
W,
20"k
Ca,bM
film,
120
K.
,/>
W,
S'J.
Campo,ilion.
2.1
101
'I>
w.
10%
Va,iobl
•.
Ca,bon. 2 M.
'f,
W,
10'1.
Compa,ifion.
4.1
K.
'f, W, lOr.
Wiro
Wound.
1.5
K, 1 W.
10'1.,
IRC
Typo
PWI
W"e
Wound. 2 5
K. 5 W,
10'1.
•
IRC
lypo
PW5
Compo,ition.
2.2
K,
'f>
w.
10'.4
Ca,ban
film.
41
K.
'J.
W.
5'1.
Vo"oblo.
Ca,bon.
100
K,
Y.
w.
20%
Compo,ilion.
Ito
K,
'I>
W,
100;.
Variablo.
Corbon.
500
K,
y,
W.
20'.
Compo.itio"
,20
K,
'/, W.
10,..
Vo,iabl
•.
Ca,bon,
75
K ';' W, 20,. ••
(jncl
...
~.'
AC
~"ilcnJ
Varioblo. Dual
Ca,b"n.
25(1
K
and
250
K,
';' W. 20,..
Vo,ioblo.
Ca,bon,
10
K,
Yo
W.
10':1.
Compa,ilion,
100
K,
'/1
w.
10%
Compo'ition.
15
K,
'I>
w,
10'/.
Ca,bon
film. ,
101,
';'
w.
I'.
Campo'illan.
B20.
I W.
10'1
•
COILS
Coil.
Poal:ing,
20
"H.
5%
Coil, Poak,ng,
l6
"H
5~~
(On Compo R
....
10
K.
'/>
W.
20%J
SWITCHES
Sw'IC~
Rola'y
(V
Rang.
I
, Po,itian', 4 50crion<
S."cn.
Rola,y
(H/S
.....
p Sol.)
6 po,ition" 5 50clio",
h,tcn,
DPDT
15,ncl
Slaclpolo
TIPo
55·))
MISCELLANEOUS
T'on,I",mo,.
Powo,
Lamp. P'lol, No.
41
Lampholdo, and Jowol, Pilot.
Diolco Na.
155-621
50cl:ol.
Tub.~
Min. , Pin,
Ind.
Hdw,.
No NPl6
Socl:.I,
Tub.
Min.
BOlol,ro, I Pin,
~bl
No 9122'1l
Sock
.. , CRT.
Wafer
Typ., Iltd. Hdw"
Ho.
Kn'll
Panol.
fran'
G,aph
Ser.on
....
1,
G,aph
5cro.n
loo'd.
LQmlnO'od
Ci,cuil
lindinS
Po"
Clamp.
CRT,
Poul
and
"oltman
No.
LB·ISlI
Canoocto,. Minial
...
M,c,ophano,
Mal.,
~1.ct,oGraft
No,
451
Conn.do,
Miniatu,.Microphon.,
fomal
•.
'~loct'OGrafl
No. 4Sl
STOCK
NO.
21~60l
21~59'
219201
219.01
21~1I04
21"02
59)59
21~110
21~129
21~I"
219200
10,",11
21~122
51161
21911~
219258
219121
21~20]
212151
SYMBOL
NO.
DESCRIPTION
STOCK
SYMIOL
DESCRIPTION
NO.
NO.
foci,
Rubbe'.
Allanl,<; India
Rubb.,
Clip,
Min,gate,. M ••
n.,
~I.c
N,
"
N,
"
G,amm",
Rubbe',
Philo
/lubbe,
In,ulala,
M,ni.Cllp, Muelle,
~I.c,
,,'
Ne.
1181A
Ne.
12
Cord,
Power, B &
101
Eloc
Ce,p.
Sn.lI. Probe (2 pioco.)
No.
ll-lO~
Knob
II
••
Ple,lie
59541
Hondlo,
81od,
PhilO
B,i.!
Cc
••
!(nob,
Siock
Rubb.,
'4818
N,
4.01
WARRANTY
Factory~Wired
Instruments
Radio
Corporation
of
America
warrants
its
test
and
measurmg
equipment.
when
properly
registered,
agamst
defects
in
workmanship,
materials,
and
con-
struction
under
normal
use
and
serVlce
for a period
of
one
year
from
the
date
of
sale
to
original
purchaser.
Under
thlS
warranty,
RCA's
obligatIOn is
limited
to
repairmg
or
replacing
any
defective
parts
except
fuses,
which
are
not
covered
by
this
warranty.
This
warranty
does
not
apply
to
any
mstrument
which
has
been
altered
in
an
unauthorized
manner,
or
which
has
been
misused
or
damaged
by
accident
or
negligence,
or
which
has
had
the
senal
number
removed,
altered
or
effaced.
RCA
tubes
and
RCA
batteries
used
in
such
eqmpment
are
covered
by
our
standard
tube
or
battery
warranty.
Secondary
damage,
caused
by
leaky
batteries,
is
not
covered
by
this
warranty.
Kits
Radio
Corporation
of
Amenca
warrants
the
parts
(except
fuses)
suppJted
10
its
test
instrument
kits,
when
properly
registered,
to
be
free
from
defects
under
normal
use
and
service
fOl" a period
of
three
months
from
date
of
sale
to
original
purchaser.
Under
this
warranty,
RCA's
obltgation
is
limited
to
repairing
or
replacing
any
such
defective
parts
that
are
returned
to
its
factory
or
authorized
service
depots,
This
warranty
is
completely
voided
if
acid-core
solder
or
paste
fluxes
have
been
used
in
the
wiring.
Furthermore,
RCA
will
not
replace, repair,
or
service
any
kits
thus
mishandled.
RCA
tubes
and
RCA
batteries
used
in
such
equipment
are
covered
by
our
standard
tube
or
battery
warranty.
Secondary
damage,
caused
by
leaky
batteries,
is
not
covered
by
this
warranty,
The
facilities
of
RCA
and
its
service
depot~
are
available
to
RCA's
customers
at a nominal
fee
for
the
repair
of
kit-instruments
which
have
been
completely
assembled
in
accordance
with
RCA's
assembly
instructions.
In
the
handling
of
such
instruments,
the
serviCe
depots
will
adjudge
the
responsibility
for
the
malfunctions
found,
and
apportion
the
cost
of
repairs
accordingly
between
RCA
and
the
owners
of
the
kit-instruments.
RADIO CORPORATION
Of
AMERICA
This
warranty
is
valid
only
when
the
card
enclosed
with
the
instrument
is
properly
filled in
and
returned
for
reCJistration,
STOCK
NO.
219485
219120
DeVICes
or
arrangements
shown
or
described
herein
may
use
patent.
of
RCA
or
others.
Information
contained
herein
IS
furnished
without
responsibility
by
RCA
lor
,ts
use
and
Without
prejudice
to
RCA's
patent
rights.
23
•
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