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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 •
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