Tektronix 305 DMM Instruction Manual
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Tektronix 305 DMM Instruction Manual

Tektronix 305 DMM Instruction Manual

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  • Page 2 Tfektronix 305 DMM OSCILLOSCOPE OPERATORS INSTRUCTION MANUAL...
  • Page 3 Tektronix. Inc. P .0 . Box 500 Beaverton. Oregon 97077 070-2424-00...
  • Page 4 Tektronix COMMITTED TO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL 305 DMM OSCILLOSCOPE OPERATORS IN S TR U C TIO N M A N U A L First Printing JUL 1978 Serial Number----------------------------- Revised JUL 1981...
  • Page 5 Products of Tektronix, Inc. and its subsidiaries are covered by U.S. and foreign patents and/or pending patents. TEKTRONIX, TEK. SCOPE-MOBILE, a n d f^ ? * are registered trademarks of Tektronix, Inc. TELEQUIPMENT is a registered trademark of Tektronix U.K Limited.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS Page Page LIST OF ILLUSTRATIONS LIST OF TABLES ADJUSTMENT A N D BASIC DISPLAY GENERAL INFORMATION Oscilloscope Display Introduction Digital M ultim eter Display Safety Inform ation Operating Voltage APPLICATION AND MEASUREMENTS Internal Battery Operation Instantaneous A m plitude Measurements-DC Battery Charging Peak-to-Peak A m plitude Measurement-AC Battery Care...

  • Page 7: List Of Illustrations

    LIST OF ILLUSTRATIONS Page Page Figure 1. Description o f power source operation. Figure 13. Example o f peaktopeak voltage Figure 2. View o f rear cover. measurement. Figure 3. Right side view o f instrument cabinet. Figure 14. Example o f time duration and frequency Figure 4.

  • Page 8: List Of Tables

    LIST OF TABLES Page TABLE 1. Battery charge related to operating tem­ perature and charging temperature. TABLE 2. Electrical Characteristics 305 Operators...
  • Page 9 305 DMM Oscilloscope 305 Operators...

  • Page 10: General Information

    5 m illivolts/division to 10 volts/division in a 1-2- 5 sequence. The horizontal deflection system provides cali­ The Sony/Tektronix 305 DMM Oscilloscope is a versatile brated sweep rates from 0.5 second to 1 microsecond per solid-state (except crt> portable instrument tha t combines division.

  • Page 11: Operating Voltage

    This instrument may operate from an external dc source, rechargeable batteries (supplied w ith the instrument), or a In the ac power source mode, the 305 DMM Oscillo­ 115 or 230 volt ac nominal line voltage. scope operates from a single phase power source, which...
  • Page 12 A C L I N t V U L I A l i b H A N l i t IN U IC A I U K i c k n h l rvmen suunv-c u rc n m iu n ©...

  • Page 13: Internal Battery Operation

    I ne teatures oattery operation irom six recuarye- ju d W A R N I N G able nickel-cadmium cells (1.2 volts each, total nominal voltage o f 7.2 Vdc). The operating time o f the internal Change o f ac voltage must be accomplished by batteries depends upon display intensity, state o f battery qualified service personnel.

  • Page 14: Battery Charging

    BATTERY CHARGING TABLE 1 Battery charge related to operating temperature and charging temperature. To apply full charge to the batteries, connect the instru­ ment to a power line, turn SCOPE POWER and DMM Charging Operating Temperature POWER off, switch the Power Source Selector switch to ♦55s C Temperature -1 5 °...

  • Page 15: Controls And Connectors

    CONTROLS AND CONNECTORS Controls and connectors necessary fo r proper operation AC Input Voltage Selector s w itc h -In conjuction of the instrument are located on the front, side, and rear with the Power Source Selector switch, allows the instru­ cabinet panels.
  • Page 16 the C H I (CH2 or EXT TRIG INPUT, if applicable) input 3. + and - Inputs for applying external dc power connector should not exceed 250 V (dc + peak ac). source {+9 to +32 volts! {Figure 3). 4. DMM IN P UT-C onnector to apply external voltages 7.

  • Page 17: Calibrator And Display Controls

    CALIBRATOR AND DISPLAY CONTROLS VERTICAL CONTROLS (FIGURE 6) (FIGURE 5) 14. POSITION (CHI or X and CH2 or Y )-C o n tro ls the vertical position o f the c rt display for each channel. In the X-Y mode of operation, the CHI (X) controls the position SCOPE POW ER-Pushbutton switch turns the oscil­...
  • Page 18 305 Operators...
  • Page 19 selects method o f coupling the input signal to the vertical deflection system. AC: Input signal is capacitively coupled to the vertical attenuator circuit. Dc component o f the input signal is blocked. Lower frequency lim it (lower — 3 dB point) is about 10 hertz.

  • Page 20: Horizontal Controls

    tween the signals applied to the C H I and CH2 INPUT con­ nectors. This switching between channels occurs at the com­ pletion of each sweep. This operating mode is useful when viewing both input signals at sweep rates o f 1 millisecond/ division or faster.

  • Page 21: Triggering And Sweep Controls

    s t w u i v iv a n a D ie j-^ o n iro i tconcentric wun i a l the SEC/DIV switch) provides continuously variable uncali­ brated sweep rates between the calibrated settings o f the SEC/DIV switch. Extends the slowest sweep rate to at least 1.25 seconds per division.
  • Page 22 CH2 (in); The signal connected to the CH2 INPUT con­ 29. TRIGGER LEVEL— Selects the amplitude point on nector is the trigger signal. the triggering signal at which sweep is triggered. It is usually adjusted after Trigger Source, Coupling and Slope have EXT (External Trigger) (CHI and CH2 push buttons been selected.

  • Page 23: Digital M Ultim Eter Controls

    D IG ITAL MULTIMETER CONTROLS (FIGURE 9) DMM POWER-Push-button switch turns the digital multimeter on (in) and o ff (out). The digital readout lights when power is applied to the multimeter. FUNCTION— Self cancelling switches select the voltage or resistance measurement functions of the digital multimeter.

  • Page 24: Basic Instrument Operation

    BASIC INSTRUMENT OPERATION waveform. To maintain the original frequency character­ OPERATING CONSIDERATIONS istics o f an applied signal, high quality, low loss coaxial cable should be used. Also, the cable should be terminated at both ends in its characteristic impedance. If this is not To ensure optimum measurement accuracy, the following possible, use suitable impedance matching devices.
  • Page 25 Probe Compensation To ensure that measurements are accurate, always com­ pensate the probe before using. To compensate the probe, RRECT (Ft .A T ) touch the probe tip to the ,3V CAL OUT jack on the 305 front panel and display several cycles o f calibrator square wave at approximately A divisions in amplitude.

  • Page 26: Adjustment A N D Basic Display

    H U J U d l l V I C n i A I N U D M 5 I U U l O r L M T O Intensity To verify the operation and accuracy o f the 305, con­ firm the following checks and adjustments.
  • Page 27 VO LTS /D IV to 10m. 1. Position trace to the center horizontal graticule line. Adjust the horizontal POSITION control so the dis­ 2. Adjust TRACE ROTATION so the trace is parallel to play begins at the le ft vertical graticule line. the center horizontal graticule line.
  • Page 28 USE AN INSULATED SCREWDRIVER WHEN MAKING THESE ADJUSTMENTS. CHI STEP ATTN BAL CH2 STEP ATTN BAL RECESSED SCREWDRIVER ADJUSTMENTS TO ELIMINATE CRT TRACE SHIFT WHEN SWITCHING BETWEEN ADJACENT POSITIONS OF THE VOLT/ DIV CONTROL SWITCH. ASTIG (ASTIGMATISM) RECESSED SCREWDRIVER ADJUSTMENT USED IN CONJUNCTION WITH THE FOCUS ADJUSTMENT TO OBTAIN OPTIMUM DEFINITION OF THE CRT.

  • Page 29: Dig Ital Multimeter Display

    8. Rotate the C H I VO LTS /D IV CAL (Variable) control 3. Rotate the SEC/DIV switch ono or tw o positions on either side o f the .5 ms position. The display sweep rate to its fu lly counterclockwise position. The display should should change accordingly.
  • Page 30 Connect the LO test probe to the reference test point DC Voltage (usually circuit ground or to a test point) and the HI test 1. Set DMM POWER switch on (in). probe to the unknown ac voltage to be measured. 2.

  • Page 31: Application And Measurements

    APPLICATION AND MEASUHEMENIS instantaneous Amplitude Measurement-DC Once the operator becomes fam iliar w ith the instrument (Figure 12) and makes the initial operator's adjustments, this section w ill aid in making measurements. Basically, this instrument Measure the amplitude o f any point on a waveform w ith is used the same as if it were an individual m ultim eter and respect to ground as follows: individual general purpose oscilloscope w ith the added con­...
  • Page 32 W O 1 ( Q I I K i U I w u u p i l l l j l W I « U , • O J I H W I I M « v * 5 I V » reference line.

  • Page 33: Peak-To-Peak A M Plitude Measurement-Ac

    reaK-io-reaK am plitude measurement— (Figure 13) Use the following procedures fo r peak-to-peak amplitude measurements: 1. A pply the signal to be measured to either vertical input connector. Set the Vertical Mode to the channel to be used. 2. Set SEC/DIV to display several cycles o f wave form.

  • Page 34: Voltage Comparison Measurements

    Voltage Comparison Measurements Substituting example values: Reference signal amplitude is 30 volts w ith a VOLTS/ For application where signal voltage is compared to D IV switch set to 5 and the VO LTS /D IV Variable ad some signal reference amplitude, it may be desirable to use justed to provide a vertical deflection o f 4 divisions: a different deflection factor than available w ith settings o f .

  • Page 35: Time Duration And Frequency Measurement

    Time Duration and Frequency Measurement (Figure 14) Set the SEC/DIV control to display one complete wave­ form. Check that the C A L (Variable) control is in the detent position. Measure the horizontal distance between the two time measurement points (in divisions) and m u ltip ly this distance by the setting o f the SEC/DIV control.

  • Page 36: Time Difference Measurement Between Two

    Time Difference Measurement Between Two Pulse Waveforms From Different Sources (Figure 15) 1. Obtain a normal sweep display. 2. Confirm SEC/DIV C AL (Variable) control is in the CALibrated detent position. 3. Set Trigger Source to C H I. 4. Connect known reference signal to the C H I INPUT connector and the comparison signal to CH2 INPUT connector.

  • Page 37: Dual Trace Phase Difference Measurements

    Dual Trace Phase Difference Measurements CHANNEL 1 CHANNEL 2 (Figure 16) Phase comparison between any tw o signals o f the same frequency can be determined using the dual trace feature o f the instrum ent T o make these comparisons, use the following procedures: MEASURE 1.
  • Page 38 6. If input signals are o f opposite polarity, pull the CH2 10. Measure the horizontal difference (in divisions) be INVERT knob to invert the CH2 display (signals may be o f tween corresponding points on the tw o waveforms, opposite polarity due to 180°...

  • Page 39: High Resolution Phase Difference Measurement

    High Resolution Phase Uitterence Measurement (Figure 17) For phase differences less than 45" measurement accuracy may bo improved by using the PULL: X10 MAG control as follows: 1. Perform steps 1 through 8 o f the Dual Trace measure ment procedures. 2.

  • Page 40: Rise Time Measurement

    Rise time measurements are made in the same manner as time duration measurements, except the horizontal meas­ urements are made between the 10% and 90% points o f the waveform amplitude. Rise time measurements are made as follows: Set the VO LTS/D IV and Variable control for a 5 divi- sion display.

  • Page 41: Common Mode Rejection

    ..... r n v u u MVj wv i i wi i CH 1 tklUNAL WITH Some signals may contain undesirable frequency com­ UNWANTED ponents, as shown in Figure 19. Common mode rejection LINE FREQUENCY can eliminate or reduce these components from the meas­ COMPONENT urement.

  • Page 42: Specification

    SPECIFICATION NOTE Refer to the service manual fo r complete specifications. Specification given fo r an operating range o f +20°C to +30°C unless otherwise stated TABLE 2 Electrical Characteristics Supplemental Inform ation Performance Requirement Characteristic CALIBRATOR O utput Voltage 0.3 V w ithin 1%.
  • Page 43 TABLE 2 (com) Supplemental Information Performance Requirement Characteristic Deflection Factor (cont) Accuracy W ithin 3%. 0°C to +40°C -1 5 °C to 0°C W ithin 4%. +40°C to +55°C W ithin 4%. Extends deflection factor to at Uncalibrated (Variable) Continuously variable between least 25 volts/div.
  • Page 44 TABLE 2 (contl Characteristic Performance Requirement Supplemental Information VERTICAL Input R and C Input Resistance 1 M fi w ithin 2%. Input Capacitance Approximately 47 pF. Maximum Input Voltage Dc Coupled 250 V (dc + peak ac). Ac Coupled 250 V (dc + peak ac) or 250 V p-p ac at 1 kHz or less.
  • Page 45 TABLE 2 (cont) Supplemental Information Characteristic Performance Requirement Trigger Sensitivity Icont) 0.3 division internal or 15 mV Ac Coupled external from 60 Hz to 0.5 MHz, increasing to 0.75 division internal o r 50 mV external from 0.5 MHz to 5 MHz. Attenuates all signals below about 60 Hz.
  • Page 46 Characteristic Performance Requirement Supplemental Information TTL Trigger (Trigger Mode: Normal and Dc Coupling. V /D iv: 50 m, 0.1 or 0.2) Threshold Voltage In t (with 10X probe) 1.4 V w ithin ±0.3 V. 1.4 V w ithin ±0.2 V. Ext (with 10X probe) Minimum Input Swing In t...
  • Page 47 Characteristic Performance Requirem ent Supplemental In fo rm a tio n HORIZONTAL Sweep Range 18 steps in 1-2-5 sequence. X10 MAG Range .5 s/div to 1 \i)div. extends fastest sweep rate to . 1 ps/div. SEC/DIV Variable in Cal detent posi­ Accuracy tion.
  • Page 48 c » « Supplemental Information Performance Requirement Characteristic SEC/DIV CAL (Variable) Range Continuously variable between Extends slowest sweep range to at calibrated settings. least 1.25 second/division (2.5:1) Horizontal Magnifier X10: Calibrated Magnifier Over center 8 division display. Exclude Accuracy the first 10 divisions and all the divi­ sions past 90th division.
  • Page 49 Characteristic Performance Requirement Supplemental Information X-Y Mode X-Y position o f SEC/DIV switch and X-Y (CH2) position o f display mode switch must be selected. Same as vertical. Over the center 8-divisions o f display. X Sensitivity Accuracy (0U C to +40°C| W ithin 4%.
  • Page 50 TABLE 2 (cont) Supplemental Information Characteristic Performance Requirement DC Voltm eter (corn) Common Mode Rejection A t least 100 dB at dc, 80 dB at 60 Hz w ith 1 kI2 unbalance. A t least 30 dB at 60 Hz increasing Normal Mode Rejection 20 dB per decade to 2 kHz, when maximum input signal voltage is...
  • Page 51 TABLE 2 (coin) Characteristic Performance Requirement Supplemental Inform ation Ohmmeter Range 2 kH , 20 k ft, 200 k fi. 2000 kU. Accuracy (+15°C to +35°CI W ithin 0.6% o f reading, ±3 counts. Measurement Current 2 V -r range setting. Response Time No more than 5 seconds plus the range step time (no more than 1...
  • Page 52 TABLE 2 Icont) Characteristic Performance Requirement Supplemental Information Maximum Safe Input Voltage at DMM INPUT Connector (cont) ACV FUNCTION Setting 700 V rms if sinusoidal. ±1000 V (dc + peak ac) between HI and LO inputs or between HI and chassis.
  • Page 53 TABLE 2 (cont) Performance Requirement Supplemental Information Characteristic Operating Time (cont) INTENSITY, maximum 2.0H. 8 div, 5 MHz signal displayed DMM only operating 10.0H. Oscilloscope and DMM 3.2H. Calibrator waveform displayed INTENSTIY, maximum 1.6H. 8 div, 5 MHz signal displayed ENVIRONMENTAL Temperature -1 5 °C to +553C (Oscilloscope)

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