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Summary of Contents for WO-33A

Page 1: ...ICE 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 ...

Page 2: ...sulation 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 again...

Page 3: ...s 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 an...

Page 4: ...iiiiiiiiiiiiiiiiiiii 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 sine wave 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...

Page 5: ...f 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 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii...

Page 6: ...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 p...

Page 7: ...IN OHMS ALL VQLTAGES POSIT IE fROM GROUND AND MEASURED WITH A VOLTOHMYSr S 1ITCHES S I AND S 2 SHO WN IN MAXIMUM CCW POSITIQN INSTRUMENTS WITH SERIAL 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 ION RANGE I ccw M x 0 0 2 2 0 06 N W 3 0 2 4 0 6 5 2 0 WIDE 6 6 0 SAND g J 9 CAL R 16 I R 17 120 CI6 S60 I I R22 1220K 1 ...

Page 8: ...iiiiiiiiiiiiiiiiiiiii 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 recommen...

Page 9: ...uipped 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...

Page 10: ...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 osci...

Page 11: ...f 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 con...

Page 12: ...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 1...

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