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Tektronix 442 Instruction Manual

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  • Page 2 BEFORE READING- THIS MANUAL REPRINTED JULY 1980 PLEASE CHECK FOR CHANGE INFORMA TION A T THE REAR OF THIS MANUAL.
  • Page 3 TEKTRONIX® r­ Tektronix, Inc. P.O. Box 5 00 INSTRUCTION MANUAL Beaverton, Oregon 97 07 7 First Printing AUG 1977 070-2373-00 Serial Number...
  • Page 4 Tektronix warrants that this product is free from defects in materials and workmanship. The warranty period is one (1) year from the date of shipment. Tektronix will, at its option, repair or replace the product if Tektronix determines it is defective within the warranty period and if it is returned, freight prepaid, to a service center designated by Tektronix.

  • Page 5: Table Of Contents

    LOCATION AND OPERATION O F EXTERNAL Vertical Gain Check CONTROLS, CONNECTORS, AND INDICATORS Basic Timing Check Introduction Normal Sweep Operation Crt Display and Power Applications External Blanking Peak-to-Peak Voltage Measurements Power Selectors and Dc Balance Instantaneous Voltage Measurements-Dc 442 Operators...
  • Page 6 TABLE OF CONTENTS (Cont.) Page BASIC OSCILLOSCOPE OPERAT ION ......Comparison Measurements ....Time Duration Measurements ....Frequency Measurement ..... Rise Time Measurements ..Time Difference Measurements ....Multi-Trace Phase Difference Measurements x-v Phase Measurement ( � 442 Operators...
  • Page 8 1. 442 Fig. Oscilloscope 442 Operators...
  • Page 9 OPE RAT ING VOLTAGE SA FETY IN FO R MA T ION Power Operat ion The 442 Oscilloscope is designed to be operated from a single phase power source which has one of its current car­ The 442 operates from either 120 or 240 V ac input - rying conductors at ground potential (earth ground).
  • Page 10 Range Selector 240 V Nominal Nominal 2373·2 1 08 to 1 32 V RMS 21 6 to 250 V RMS 90 to 1 1 0 V RMS 1 98 to 242 V RMS Fig. Power switches at bottom. 442 Operators...

  • Page 11: Fuse Information

    Fuse Information WARNING The 442 contains a power fuse located in a fuseholder on the Rear Panel (see Table 2 and Fig. 3). Dangerous potentials exist at several points throughout this instrument. Qualified person­ nel, only, are authorized to remove cabinet.
  • Page 13 Pin connector supplies internally generated square zontal POSITION controls . Release BEAM FINDER wave of approximately 0.5 volts at approximately push button and adjust trigger LEVEL control for a 1 kHz for use in checking attenuation factors and stable display. compensation of probes. 442 Operators...

  • Page 14: External Blanking

    Two-position, screwdriver actuated, slide switch which can be set to allow operation from one of two 2373-5 ac ranges (see Table 1) . Position left for H I and posi­ tion right for LO. Fig. 5. External Z-AXIS INPUT on Rear Panel. 442 Operators...

  • Page 16: Horizontal

    Controls-out of detent left-which provide contin­ uously variable (uncalibrated) deflection factors be­ All frequency components of input signal tween calibrated positions of the VOL TS/DIV switches. are passed to vertical amplifier. Rotate controls clockwise to detent position for cali- 442 Operators...
  • Page 17 Channel 1 to Channel 2 at a frequency of approximately 250 kHZ. Trigger signal is automatically derived from Channel input signal unless CH 2 and CHOP push buttons are de­ pressed simultaneously. Fig. Vertical system controls. 442 Operators...
  • Page 18 1.25 sec/div). MAGNIFIER X 10-X1 2373-8 Push-button switch (in, Xl 0) increases each sweep rate by a factor of 1 0. Extends the fastest sweep rate to 1 0 nanoseconds/division. Fig. Horizontal system controls. 442 Operators...

  • Page 19: Triggering

    . In CHOP, AL T, or DI F F vertical mode, the trigger signal is a sample of Channel input unless CH 2 is depressed simultaneously with CHOP, AL T, or DIF F . Fig. Triggering system controls. 442 Operators...
  • Page 21 Signals below justing HOLDO F F control. HOLDO F F increases approximately 60 Hz are attenuated. clockwise to MAXimum. 442 Operators...

  • Page 22: Basic Oscilloscope Operation

    -250 you connect the probe to a dc supply the re­ main on screen so ac component of signal can be measured sulting transient amplitude is in normal manner. 442 Operators...

  • Page 25: Probe Compensation 1

    Adjust Channel VOLTS/DIV switch to obtain desired NOTE display amplitude while adjusting Channel POSITION control to locate display within crt viewing area. Verify correct probe compensation (see beginning of Operator's Adjustments and Checks). 5. Adjust LEVEL control for a stable display. APPL ICAT IONS 6.
  • Page 26 5. Turn vertical POSITION control so lower portion of NOTE > waveform coincides with one of the graticule lines below center horizontal line, and top of the waveform is in the This procedure may be used to measure between viewing area. Move display with horizontal POSITION two points on the waveform rather than control, so one of the upper peaks aligns with center vertical...
  • Page 27 1 . Connect test signal to either Channel 1 or Channel 2 input connector. 8. Set Triggering controls to obtain a stable display . Set SEC/DIV switch to a setting that displays several 2. Set VERT MODE to display channel selected . cycles of signal. 442 Operators...

  • Page 28: Comparison Measurements

    Substituting the given values: 9. Measure distance in divisions between reference line and point on waveform at which de level is to be measured. In sta nt an e ou s For example, in Fig. 1 3 measurement is made between 4.
  • Page 29 Vertical Deflection Factor. To establish an arbitrary ver· reference signal tical deflection factor based upon a specific reference am· Vertical amplitude (volts) plitude, proceed as follows: Conversion vertical VOLTS/DIV Factor deflection switch (divisions) setting 1. Connect reference signal to Channel or Channel input connector.
  • Page 30 Vertical 3. To establish an arbitrary sweep rate so the unknown 30 V Conversion 1. 5 period of a signal can be measured accurately at any setting 4 X 5 V Factor of the SEC/DIV switch, the period of reference signal must be known .

  • Page 31: Time Duration Measurements

    6. Adjust vertical POSITION control to move points be­ This answer can be converted to frequency (repetition tween which time measurement is made to center horizon­ rate) by taking the reciprocal of the period . tal line . 442 Operators...

  • Page 34: Rise Time Measurements

    1 0% and 90% points is four divisions (see Fig. 1 5) and SEC/DIV switch is set at 1 /ls. Applying time duration formula to rise time: � HORIZONTAL DISTANCE 2373-15 horizontal Rise Time SEC/DIV difference X Time Duration setting (divisions) Fig. Measuring rise time. 442 Operators...

  • Page 35: Time Difference Measurements

    The calibrated sweep rate and dual-trace features of the ment is made) in relation to center horizontal line. 442 allow measurement of time difference between two separate events. To measure time difference, use the fol­ 8. Adjust horizontal POSITION control so Channell...

  • Page 36: Multi-Trace Phase Difference Measurements

    Multi-Trace Phase Difference Measurements Phase comparison between two signals of the same fre­ 6. Set SEC/DIV switch to a sweep rate which displays 442. quency can be made using dual-trace feature of the about one cycle of waveform. This method of phase difference measurement can be used up to frequency limit of vertical system.
  • Page 37 /division as shown in Fig. 1 7. DIFFERENCE Using the formula: , � (360°) DIVIS IONS horizontal sweep rate Phase Difference difference X 2373-17 (1074-27) (degrees/div) (divisions) Substituting the given values: Fig. Measuring phase difference. 1979 442 Operators REV A, APR...

  • Page 38: Phase Measurement

    (Yl and less than 2373-18 (1331-13) 1 0 divisions horizontally (Xl. The Channel 1 VOL TS/DIV switch controls horizontal deflection (Xl and Channel VOL TS/DIV switch controls vertical deflection (Yl. Fig. Phase difference measurement from an X-V display. 442 Operators...
  • Page 39 From trigonometric tables: EXAMPLE: To measure phase of display shown in Fig. 1 8 where A is 5 divisions and B is 1 0 divisions, use the formula: R E V . A, F E B . 1978 442 Operators...
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  • Page 43 Inner back cover...
  • Page 44 Outer back cover...

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