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Tektronix 323 Operator's Handbook Manual

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  • Page 2 O P E R A T O R S H A N D B O O K T Y P E 3 2 3 O S C I L L O S C O P E This handbook is a reference docum ent on basic characteristics, operation, performance check, maintenance, and applications.

  • Page 3: Table Of Contents

    How to Use External Blanking 46 “ Common Operational Errors Copyright © 1970 Tektronix, Inc., Beaverton, Oregon. Printed in the United States of America. All rights reserved. Con­ tents of this publication may not be repro­ duced without permission of the copyright...

  • Page 4: Specifications

    A B R ID G E D SPECIFICATIONS (Electrical) Complete updated specifications are provided in the Instruction manual. Performance Requirement Characteristic Deflection Factor W ithin 3% o f VOLTS/DIV Accuracy indication. 1 nput R & C ±2%, 45 pF ±4 pF. Bandwidth/Rise- time X I Gain...
  • Page 5 Characteristic Performance Requirement Trigger Sensi­ tiv ity 1 nternal 0.3 div. to 400 kHz increasing to 0.75 div. for 4 MHz External 75 mV to 400 kHz increasing to 190 mV fo r 4 MHz. (Signal applied to EXT TRIGGER IN­ PUT connector, ATTEN set to position.
  • Page 6 Performance Requirement Characteristic Magnified 2 jus/div to 20 ms/div., within 0.5 jus/div, 1.0 jus/div. 50 ms/ div, and 0.1 s/div, within 5% External Horizon­ 200-300 mV/div. tal 1 nput Deflec­ tion Factor Square Wave Calibrator Amplitude 0.5 V, ±2% (peak to peak). Approximately 850 Hz Frequency Risetime...

  • Page 7: Power Requirements

    Characteristic Performance Requirement Power Supply Battery Pack Six NiCdC Cells Operating Time 3 to 7 hours, depending on display intensity, amplitude, and input signal frequency. Charge Time Approximately 16 hours (Full Charge) External DC 6 V to 16 V at 4.5 watts maxi­ Supply Line Voltage (to battery pack)

  • Page 8: Power Pack Replacement

    See Battery Care for instructions. To operate the 323 from an external DC power source; set the power pack source switch to EXT DC position, connect a +6 to +16 volt DC source...

  • Page 9: Battery Care

    The 323 will not operate from the internal battery or an AC source if the selector switch is left in EXT DC position. The battery w ill, how­ ever, charge at full charge rate if AC Power is applied. Fig. 1 illustrates removal and replacement procedure.
  • Page 10 p ow e r Cover-securing co nn ec tio n screw A . Loosen securing screw and p u ll d ust cover o ff. B. D isconnect in te rco n n e c tin g pow e r leads. Release securing clam p.
  • Page 11 A . 115 V A C co n n e ctio n . Fuse size 0 ,25 A . B. 230 V A C co n n e ctio n . Fuse size 0 ,1 2 5 A , Fig. 2. 115 V/230 V connections for Type 323. ®...

  • Page 12: Fuse Location

    c . o u e v ' Power S up p ly board DC Fuse (1 A) .(operating j J p o w er) ° A . DC Fuse C. Spare fuses Fig. 3. Fuse location.
  • Page 13 operating time, the battery should be fu lly charged and maintained at this level by using the TRICKLE CHARGE feature to offset self-discharge until the pack is ready to use. On FULL CHARGE, the power pack delivers a constant current that is approximately 1/10 the ampere hour rating of the cells in the battery.
  • Page 14 decrease rapidly at this point; therefore, operation should be terminated w ithin 10 to 15 minutes or as soon as possible after the indicator starts to blink. This reduces the possibility of the cells becoming reverse charged. Reverse charging occurs when some cells overcome the charge of the weaker cells.

  • Page 15: Function Of Controls And Connectors

    FUNCTION OF CONTROLS CONNECTORS Selects vertical deflection factor and a 5 div cali- ' brator signal to calibrate X I and X 1 0 G A IN . Note effect on X I 0 V E R T G A IN (front panel) switch on display.
  • Page 16 — r~ ~ E I l --4 -- ~± f j - l ____ — - __________________ _________ Positions display horizontally. Pulling the control out magnifies (1 0 X ) the center portion of the dis­ play, which effectively divides the indicated sweep rate (T IM E /D IV ) by 10.
  • Page 17 FOCUS and IN T E N S IT Y adjusted for sharp bright display. Bright­ ness affects battery operating tim e. S e le c ts sweep (horizontal) rate. In E X T H O R IZ position, horizontal deflection depends signal applied E X T...
  • Page 18 In 1 0X position the Connects to oscilloscope chassis. Pro­ E X T T R I G vides a common ground return to signal H O R IZ IN P U T sig­ source. Common ground must be pro­ nal is attenuated by vided to insure measurement reliability a factor of 10.
  • Page 19 E X T DC POWER connectors (red + , and black —) fo r applying DC power source to the oscilloscope. Negative (—) connector is connected to oscillo­ scope case. DC voltage application does not charge the internal battery. Reversing the voltage polarity w ill blow the power pack fuse.
  • Page 20 Astigmatism. Adjusts for optim um sharpness of vertical and horizontal lines same setting of the FOCUS control. Adjusts (after V E R T X I G A IN has been adjusted) to provide cali­ brated gain factors w ith X 10 V E R T G A IN pulled out.

  • Page 21: Performance Check And Familiarization

    PERFORMANCE CHECK A ND F A M IL IA R IZ A T IO N This procedure provides a means of quickly checking operational performance of the 323. It will not check specified accuracies or completely check the instrument's performance; however, it should detect major inaccuracies or other malfunc­...
  • Page 22 CHG position. Proceed with the check after the battery has been charged or replaced. NOTE If desired, the 323 can be powered from an external DC source or from AC line source for the remaining checks. See Power Source Requirements.
  • Page 23 M id ra n g e until F o r best display^ display is visible. definition, A , Front panel. B. Calibration adjustments on bottom panel. Fig. 4. Front and bottom view of the controls and adjustments. Controls are set to provide a display.
  • Page 24 Check/Adjust Astigmatism Trace Rotation a. With the INTENSITY adjusted for desired brightness, the calibrator display should be sharp and well focused. b. Adjust—FOCUS control and Astigmatism (screwdriver adjustment, bottom o f instrument, see Fig. 4) for optimum display sharpness. c. Adjust—Trace Rotation to align the display with the graticule horizontal divisions.
  • Page 25 g. Adjust—Vert X10 Bal for minimum display shift as the X10 VERT GAIN control is pulled out and pushed in. Push in the control to its X I position. h. Adjust—Var V/Div Bal for minimum baseline shift as the VARIABLE (VOLTS/DIV) control is rotated through its range.
  • Page 26 (A ) C orre ct W m m m S m m i . . ■ ■ ■ ■ IS li (B) In c o rre c t (overcom pensated) (C) In c o rre c t (undercom pensated) Fig. 5. Probe compensation. ®...
  • Page 27 e. Check—Display amplitude should decrease to 2.5, then 1.0 division. f. Switch the VOLTS/DIV selector to .1 posi­ tion and pull out the X10 VERT GAIN control. g. Check—Accuracy of the .1, .2, and .5 selec­ tions o f the VO LTS/DIV selector. h.
  • Page 28 Check— Trigger sensitivity requirement by adjusting TRIGGER control for a triggered display. Check EXT TR IG G ER or H O R IZ Oper­ ation NOTE HORIZ mode, the internal sweep is disabled and the CRT is unblanked. C o n s e q u e n tly , a brighter than normal stationary spot will appear on the face of the...

  • Page 29: Measurement Technique

    Return the VARIABLE control to the CAL position. M EA SU REM EN T TEC H NIQ U E The following procedure describe a few opera­ tional techniques and measurements that can be used or made with the Type 323 oscilloscope.
  • Page 30 This instrument can also be used for many applications which are not described in this manual. Contact your local Tektronix Field Office or representative for assistance in making specific measurements. The following publications also de scrib e oscilloscope measurement techniques which can be adapted for use with this instrument.

  • Page 31: Triggering

    Volumes 1 and 2, John F. Rider Publisher Inc., New York, 1964. Triggering The Display The sweep for the Type 323 can be triggered from an internal or external source. Internal trig­ gering is used for most applications on time, fre­...
  • Page 32 Either manual or automatic triggering mode can be used with a choice of triggering on the (+) posi­ tive or (—) negative slope of the triggering signal. For most applications, automatic triggering is used because a sweep is generated when the trigger signal is absent.
  • Page 33 Fig. 6. Selecting trigger slope and amplitude.

  • Page 34: Single Sweep Operation

    If manual triggering is desired, adjust the TRIGGER control through the slope to the trig­ gering level desired. To trigger from an external trigger source: a. Set the Trigger selector to (AC) position, TRIGGER control to the + or — AUTO position.

  • Page 35: Internal External Sweep Operation

    VARIABLE control is in the CAL position. External sweep or horizontal operation for the Type 323 can be used for X-Y displays and mating the oscilloscope to a swept frequency device such as a spectrum analyzer. The external horizontal sensitivity is 200 to 300 mV/division or 2 V to 3 V for a full screen (10 div) sweep.
  • Page 36 a. Set the T IM E /D IV to EXT HORIZ position and the Trigger input selector to EXT TRIG OR HORIZ position (AC if the signal has a DC compo­ nent, DC if the signal frequency is 30 Hz or less and w ithin the input voltage lim itation of the input).
  • Page 37 1. Center the display horizontally. 2. Measure total amplitude (V *). 3. Measure center vertical line amplitude enclosed by ellipse (V c). 4. Divide V c by V-j to obtain sine of phase angle. 5. Determine phase angle from table of trigono­ metric values.

  • Page 38: Selecting Sweep Rate

    Selecting Sweep Rate and Use of the Magni­ fier The sweep rate depends on the desired observa­ tion or measurement to be made. For frequency measurements, usually several cycles or events are displayed and the time between several cycles or events is measured (see Frequency Measurements).
  • Page 39 less the circuit under test is loaded, and the more accurate the measurement. Because of circuit loading considerations, it is always best to select low impedance points in the circuit to make your measu rements. NOTE To insure that measurements are accurate, always compensate the probe before using.

  • Page 40: How To Measure Voltages

    W A R N I N ^ J If the Type 323 is battery powered and not connected to an AC power source, a ground return to earth potential should be provided.
  • Page 41 cal deflection factor equals the product of the VOLTS/DIV setting and the probe or signal trans­ porting lead attenuation factor.) b. Select the desired TIM E /D IV setting and adjust the TRIGGER control for a triggered dis­ play. Position the display w ithin the graticule area for measurement.
  • Page 42 NOTE This technique may also be used to make measurements between two points on the waveform, rather than peak to peak. 2. Instantaneous Voltage Measurements Instantaneous voltage is measured with respect to some reference potential (usually ground). This reference level is first established by positioning the trace along a graticule line with the reference potential applied to the input;...
  • Page 43 this type of measurement, the INPUT selector switch must be in the DC position. This method can also be used to measure the DC component of ax waveform, since the average or DC value can be measured as a voltage above the reference level. Set the vertical deflection factor to an appro­...
  • Page 44 3. Voltage Comparison For applications where the signal voltage is to be compared to some signal reference amplitude, it may be desirable to establish a different deflection factor than those available with the VOLTS/DIV selector. A conversion deflection factor constant, based on a specific reference amplitude, is estab­...

  • Page 45: Time Measurement

    The peak to peak amplitude of any signal compared to this reference is measured as follows: 1) Set the VOLTS/DIV selector to a setting that will provide sufficient deflection to make a measurement. DO NOT MOVE THE V A R I­ ABLE CONTROL SETTING.

  • Page 46: Frequency Measurement

    4 div X T im e/D iv setting Tim e M A G N IF IE R setting Fig. 10. Measuring time. Frequency Measurements By use of the methods described in the previous section, you can measure the period (time required for one cycle or time for a given number of cycles) of a recurrent waveform.

  • Page 47: Phase Measurement

    To calculate the period of a known frequency Time - Frequency Phase Measurements Since a complete cycle of a sinusodial waveform represents 360°, the oscilloscope graticule can be calibrated in degrees/division by using the TIM E/ DIV selector and its VARIABLE control. Adjust the span of a reference waveform so one cycle covers a given number of divisions.
  • Page 48 A . Calibrating the displayed waveform in degrees/division. B. Phase angle between tw o waveforms. Note: the tw o dis­ played waveforms are not simultaneously on the screen. Fig. 11. Phase angle calibration and measurement.

  • Page 49: How To Use External Blanking

    How to Use External Blanking (Z axis or intensity modulation) Intensity modulation can supply additional information to a display w ithout changing the X-Y information. Blanking is accomplished by applying a positive-going signal with an amplitude between +5 V and +20 V to the EXT BLANK connector. An example of this application is the use of an accurate frequency, applied to the Z axis, to serve as timing information on an uncalibrated horizon­...

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