Tektronix TDS 684A Performance Verification Manual
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Tektronix TDS 684A Performance Verification Manual

Tektronix TDS 684A Performance Verification Manual

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Technical Reference
TDS 684A & TDS 744
Digitizing Oscilloscope
Performance Verification and Specifications
070-8990-02
Please check for change information
at the rear of this manual.
Third Edition: November 1994

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Summary of Contents for Tektronix TDS 684A

  • Page 1 Technical Reference TDS 684A & TDS 744 Digitizing Oscilloscope Performance Verification and Specifications 070-8990-02 Please check for change information at the rear of this manual. Third Edition: November 1994...
  • Page 2 Copyright Tektronix, Inc. 1994. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A.
  • Page 3 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.
  • Page 5 ........2–21 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 6 Table of Contents TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 7: General Safety Summary

    To avoid injury or fire hazard, do not operate this product in an explosive Explosive Atmosphere atmosphere. Product Damage Precautions Use Proper Power Source Do not operate this product from a power source that applies more than the voltage specified. TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 8: Safety Terms And Symbols

    DANGER indicates an injury hazard immediately accessible as you read the marking. WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 9: Certifications And Compliances

    CSA Certified Power CSA Certification includes the products and power cords appropriate for use in Cords the North America power network. All other power cords supplied are approved for the country of use. TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 10 General Safety Summary TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 11: Related Manuals

    Preface This is the Performance Verification and Specifications for the TDS 684A and 744 Oscilloscopes. It contains procedures suitable for determining if each instrument functions, was adjusted properly, and meets the performance characteristics as warranted. Also contained in this document are technical specifications for these oscillo- scopes.
  • Page 12 Preface viii TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 13 Performance Verification Procedures...
  • Page 15 They require more time to perform and suitable test equipment is required. (See Equipment Required beginning on page 1–16.) If you are not familiar with operating this oscilloscope, read the TDS 684A & 744 Reference (070-8999-XX) or the TDS 684A & 744 User Manual (070-8991-XX).
  • Page 16 Refer to Figure 1–1: “Main menu” refers to the menu that labels the seven menu buttons under the display; “side menu” refers to the menu that labels 1–2 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 17 Vertical scale, horizontal scale, and trigger level readouts Pop-up menu Main menu display area. Readouts in lower graticule area move here when CLEAR MENU is pressed. Figure 1–1: Map of Display Functions 1–3 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 18 Performance Verification Procedures 1–4 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 19: Brief Procedures

    “clock” icon (shown at left) will appear on-screen. When the verification is finished, the resulting status will appear on the screen. d. Confirm no failures are found: Verify that no failures are found and reported on-screen. 1–5 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 20 Pass appears under Signal Path in the main menu. See Figure 1–2. Highlight Cal Verify Pass Verify Pass Figure 1–2: Verifying Adjustments and Signal-Path Compensation 2. Return to regular service: Press CLEAR MENU to exit the system menus. 1–6 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 21: Functional Tests

    When you are instructed to press a menu button, the button may already be selected (its label will be highlighted). If this is the case, it is not necessary to press the button. 1–7 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 22 Figure 1–3: Universal Test Hookup for Functional Tests b. Initialize the oscilloscope: Press save/recall SETUP. Press the main-menu button Recall Factory Setup. Press the side-menu button OK Confirm Factory Init. 1–8 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 23 ACQUIRE MENU. Use the side menu to select, in turn, each of the three hardware acquire modes and confirm that the following statements are true. Refer to the icons at the left of each statement as you confirm those statements. 1–9 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 24 Set the vertical SCALE to 200 mV. Set the horizontal SCALE to 200 s. Press CLEAR MENU to remove the menus from the screen. 2. Verify that the time base operates: Confirm the following statements. 1–10 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 25 Set the horizontal SCALE for the M (main) time base to 200 s. Press TRIGGER MENU. Press the main-menu button Mode & Holdoff. Press the side-menu button Normal. Press CLEAR MENU to remove the menus from the screen. 1–11 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 26 Verify the delayed trigger counter: Press the main-menu button Delay by Time. Use the keypad to enter a delay time of 1 second. Press 1, then press ENTER. 1–12 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 27 Set the horizontal SCALE for the M (main) time base to 200 s. Notice the waveform on the display now shows two cycles instead of five. Press CLEAR MENU to remove the menus from the screen. 1–13 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 28 Disconnect the probe from the channel input and the probe-compensa- tion terminals. Remove the disk from the disk drive. Do this by pushing in the tab at the bottom of the disk drive. 1–14 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 29: Performance Tests

    20 minutes, and must be operating at an ambient temperature between +4 C and either +45 C for the TDS 684A or +50 C for the TDS 744. (The warm-up requirement is usually met in the course of meeting the first prerequisite listed above.)

  • Page 30: Equipment Required

    Checking Sample-Rate and to 10 ns; accuracy within 2 ppm Mark Generator Delay-time Accuracy 14. Probe, 10X A P6139A or P6245 probe Tektronix part number Signal Interconnection P6139A or P6245 1–16 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 31 Used to Test Video Option 05 Equipped Instruments Only 17. Oscillator, Leveled Sine 60 Hz. Sine wave Tektronix part number SG 502 Used to Test Video Option 05 wave Generator Equipped Instruments Only 18. Pulse Generator Tektronix part number PG 502 Used to Test Video Option 05 Equipped Instruments Only 19.
  • Page 32 Performance Tests 1–18 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 33 – 1.029 V +5 Div position setting, –1 V offset 200 mV Vert scale setting, + 11.420 V __________ __________ + 11.786 V –5 Div position setting, +10 V offset 1–19 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 34 +5 Div position setting, –10 V offset Analog Bandwidth 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 1–20 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 35 Low 0.25 V DELAYED TRIGGER OUTPUT, 50 High 1.0 V __________ __________ __________ __________ Low 0.25 V DELAYED TRIGGER OUTPUT, 1 M High 2.5 V __________ __________ __________ __________ Low 0.7 V 1–21 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 36 CH 3 SIGNAL OUTPUT, 50 Pk-Pk 40 mV __________ __________ Pk-Pk 60 mV Probe Compensator Output Signal Frequency (CH1 Freq.) 950 Hz __________ __________ 1.050 kHz Voltage (difference) 495 mV __________ __________ 505 mV 1–22 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 37 – 1.0355 V +5 Div position setting, –1 V offset 200 mV Vert scale setting, + 11.5385 V __________ __________ + 11.6615 V –5 Div position setting, +10 V offset 1–23 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 38 +5 Div position setting, –10 V offset Analog Bandwidth 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 100 mV 424 mV __________ __________ 1–24 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 39 MAIN TRIGGER OUTPUT, 1 M High High 2.5 V __________ __________ __________ __________ Low 0.7 V MAIN TRIGGER OUTPUT, 50 High High 1.0 V __________ __________ __________ __________ Low 0.25 V 1–25 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 40 CH 3 SIGNAL OUTPUT, 50 Pk-Pk 44 mV __________ __________ Pk-Pk 66 mV Probe Compensator Output Signal Frequency (CH1 Freq.) 950 Hz __________ __________ 1.050 kHz Voltage (difference) 495 mV __________ __________ 505 mV 1–26 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 41: Signal Acquisition System Checks

    Press CLEAR MENU to remove the menus from the screen. b. Modify the default settings: Press SHIFT; then press ACQUIRE MENU. On the TDS 684A, press the main-menu button Mode; then press the side-menu button Average 16. On the TDS 744, press the main-menu button Mode; then press the side-menu button Hi Res.
  • Page 42 Enter voltage on test record. Repeat substeps b through f until all vertical scale settings listed in Table 1–2, are checked for the channel under test. 1–28 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 43 Required One BNC T connector (Item 7) One DC calibration generator (Item 9) Two precision coaxial cables (Item 5) Prerequisites The oscilloscope must meet the prerequisites listed on page 1–15 1–29 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 44 2. Confirm input channels are within limits for DC accuracy at maximum offset and position: Do the following substeps — test CH 1 first, skipping substep 2a since CH 1 is already selected from step 1. 1–30 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 45 Press VERTICAL MENU. Press the main-menu button Position. Use the keypad to set vertical position to –5 divisions (press –5, then ENTER, on the keypad). The baseline level will move off screen. Press the main-menu button Offset. 1–31 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 46 CHECK that the Mean measurement readout on screen is within the limits listed for the current vertical scale setting and position/offset/ generator settings. Enter value on test record. 1–32 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 47 Hook up the test-signal source: Connect, through its leveling head, the sine wave output of a high-frequency leveled sine wave generator to CH 1. Set the output of the generator to a reference frequency of 6 MHz. See Figure 1–7. 1–33 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 48 50 setting. d. Set the vertical scale: Set the vertical SCALE to one of the settings listed in Table 1–4 not yet checked. (Start with the 100 mV setting.) 1–34 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 49 Press the front-panel button SET LEVEL TO 50% as necessary to trigger a stable display. At full bandwidth (for TDS 684A = 1 GHz, for 744 = 500 MHz frequency), you may also want to make small, manual adjustments to the trigger level.
  • Page 50 CHECK that the Pk-Pk readout on screen is within the limits listed in Table 1–4 for the current vertical scale setting. Enter voltage on test record. When finished checking, set the horizontal SCALE back to the 50 ns setting. 1–36 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 51 One medium-frequency leveled sine wave generator (Item 11) Required Channels One precision coaxial cable (Item 5) One 50 terminator (Item 4) One dual-input coupler (Item 8) Prerequisites See page 1–15 1–37 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 52 Connect the coupler to both CH 1 and CH 2. See Figure 1–9. Medium Frequency Sine Wave Generator Digitizing Oscilloscope Output Dual Input Coupler Terminator Figure 1–9: Initial Test Hookup 1–38 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 53 Align one V bar cursor to the time reference point of the left-most waveform edge and the other cursor to the time reference point of the right-most waveform edge by rotating the General Purpose knob. 1–39 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 54 Check against limits: CHECK that the cursor readout on screen is 100 ps. g. Enter time on test record. 3. Disconnect the hookup: Disconnect the cable from the generator output at the input connectors of the channels. 1–40 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 55: Time Base System Checks

    Press VERTICAL MENU; then press the main-menu button Coupling. Press the side-menu button to toggle it to the 50 setting. Press SET LEVEL TO 50%. Use the vertical POSITION knob to center the test signal on screen. 1–41 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 56 Set the horizontal SCALE of the D (delayed) time base to 500 ns for the TDS 684A or to 100 ns for the TDS 744. Set delayed time to 10 ms for the TDS 684A or the TDS 744 with serial # B020000 and up. Set delayed time to 10.0015 ms for the TDS 744 with serial number B019999 and below.

  • Page 57: Trigger System Checks

    One medium-frequency leveled sine wave generator (Item 11) Required Pulse-Glitch or One 10X attenuator (Item 1) Pulse-Width Triggering One 50 , precision coaxial cable (Item 5) Prerequisites See page 1–15 1–43 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 58 Press VERTICAL MENU. Press the main-menu button Coupling; then press the side-menu button to select 50 coupling. Set the horizontal SCALE to 10 ns on the TDS 684A and 12.5 ns on the TDS 744. Medium-Frequency Sine Wave Generator Digitizing Oscilloscope...
  • Page 59 CHECK that the Lower Limit readout, after the oscilloscope loses triggering, is within 2.5 ns to 7.5 ns, inclusive, for the TDS 684A or is within 3.5 ns to 6.5 ns, inclusive, for the TDS 744.
  • Page 60 Press SET LEVEL TO 50%. c. Check against limits: Do the following subparts in the order listed. Use the general purpose knob to increase Lower Limit readout until triggering is lost. 1–46 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 61 Performance Tests CHECK that the Lower Limit readout, after the oscilloscope stops triggering, is within 1 s to 3 s, inclusive, for the TDS 684A or is within 1.9 s to 2.1 s, inclusive, for the TDS 744. Enter time on test record.
  • Page 62 Press SET LEVEL TO 50%. Press TRIGGER MENU. Read the measurement results from the readout below the label Level in the main menu, not the trigger readout in the graticule area. 1–48 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 63 Read results (Check against limits): See Figure 1–16. CHECK that the Level readout in the main menu is within 9.863 V to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to 10.1147 V, inclusive, for the TDS 744.
  • Page 64 Check against limits: Do the following subparts in the order listed. CHECK that the Level readout in the side menu is within 9.863 V to 10.137 V, inclusive, for the TDS 684A or is within 9.9393 V to 10.1147 V, inclusive, for the TDS 744.
  • Page 65 Delayed Triggerable. Set the horizontal SCALE for the D (delayed) time base to 20 ns on the TDS 684A or 25 ns on the TDS 744; then press the side-menu button Main Only. Press TRIGGER MENU; then press the main-menu button Mode &...
  • Page 66 Check the Main trigger system for stable triggering at limits: Read the following definition: A stable trigger is one that is consistent; that is, one that results in a uniform, regular display 1–52 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 67 Leave the Main trigger system triggered on the positive slope of the waveform before continuing to the next step. Check if stable trigger. Figure 1–18: Measurement of Trigger Sensitivity — 50 MHz Results Shown on a TDS 684A Screen 1–53 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 68 Use the definition for stable trigger from step 2. Press TRIGGER MENU; then press the main-menu button Source. Press the side-menu button –more– until the side-menu label DC Aux appears; then press DC Aux. 1–54 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 69 –more– until CH 1 appears. Press CH 1. 4. Confirm that the Main and Delayed trigger systems are within sensitivity limits (full bandwidth, for TDS 684A = 1 GHz, for TDS 744 = 500 MHz): a. Hook up the test-signal source: Disconnect the hookup installed in step 1.

  • Page 70: Output Signal Checks

    Set the output of the calibration generator to 0.500 V. b. Hook up test-signal source 2: Connect the Main Trigger Out at the rear panel to CH 2 through a 50 precision cable. c. Initialize the oscilloscope: 1–56 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 71 CHECK that the Ch2 High readout is 1.0 volt and that the Ch2 Low readout 0.25 volts. Enter high and low voltages on test record. 1–57 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 72 3. Confirm CH 3 output is within limits for gain: a. Measure gain: Move the precision 50 cable from the rear-panel DELAYED TRIGGER OUTPUT BNC to the rear-panel SIGNAL OUT BNC. Push TRIGGER MENU. 1–58 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 73 Check against limits: CHECK that the readout Ch2 Pk-Pk is between 80 mV and 120 mV, inclusive, for the TDS 684A or is between 88 mV and 132 mV, inclusive, for the TDS 744. Enter voltage on test record.
  • Page 74 Press SET LEVEL TO 50%. Use the vertical POSITION knob to center the display on screen. Press SHIFT; then press ACQUIRE MENU. Press the main-menu button Mode; then press the side-menu button Average. 1–60 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 75 Press MEASURE; then press the main-menu button Remove Measrmnt for Ch1. Press the side–menu Measurement 1. Figure 1–22: Measurement of Probe Compensator Frequency c. Save the probe compensation signal in reference memory: 1–61 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 76 Measure amplitude of the probe compensation signal: Press SHIFT; then press ACQUIRE MENU. Press the side-menu button AVERAGE then enter 16 using the keypad or the general purpose knob. 1–62 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 77 (top level). CHECK that the difference obtained is within 495 mV to 505 mV, inclusive. Enter voltage difference on test record. 3. Disconnect the hookup: Disconnect the cable from CH 1. 1–63 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 78: Option 05 Video Trigger Checks

    Press the main-menu Standard pop-up until you select 625/PAL. d. Press the main-menu Line. e. Use the keypad to set the line number to 7 (press 7, then ENTER). Press VERTICAL MENU. 1–64 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 79 COMPST Terminator Cable Figure 1–25: Jitter Test Hookup b. CHECK that the oscilloscope lights up its front panel TRIG’D LED and it displays the waveform on screen. See Figure 1–26. 1–65 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 80 Press SHIFT; then press ACQUIRE MENU. n. Press the main-menu Limit Test Setup. o. Toggle the side-menu Limit Test to ON. p. Toggle the side-menu Ring Bell if Condition Met to ON. 1–66 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 81 STOP, the test is complete. See Figure 1–27. Stop shows test complete Figure 1–27: Jitter Test When Completed – TDS 684A Shown w. Press the main-menu Limit Test Setup. x. Toggle the side-menu Ring Bell if Condition Met to OFF.
  • Page 82 Also, CONFIRM that the waveform on the screen has one positive pulse and a number of negative pulses. See Figure 1–28. 1–68 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 83 Also, CONFIRM that the waveform on the screen has one positive pulse and a number of negative pulses. See Figure 1–29. 1–69 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 84 SHIFT, m, then ENTER). b. Setup 60 Hz signal generator (SG 502). Connect the output of the SG 502 to the CH2 input through a 50 cable. See Figure 1–30. 1–70 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 85 Use the keypad to set the horizontal scale (/div) to 50 s (press 50, SHIFT, , then ENTER). Reconnect the output of the signal generator (SG 502). Connect the composite signal connector of the PAL signal source (labeled 1–71 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 86 In other words, be sure the waveform does not move horizontally or vertically. Also, confirm that the waveform on the screen has one positive pulse and a number of negative pulses. See Figure 1–33. 1–72 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 87 Performance Tests Figure 1–33: 60 Hz Rejection Test Result – TDS 684A Shown Disconnect all test equipment from the digitizing oscilloscope. 6. Check Line Count Accuracy. a. Setup oscilloscope for Line Count Accuracy Test. Press WAVEFORM OFF. Press CH1. Press HORIZONTAL MENU.
  • Page 88 Press the side-menu to Set to 50%. Use the HORIZONTAL POSITION knob to move the falling edge of the sync pulse to two divisions to the left of center screen. See Figure 1–35. 1–74 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 89 Performance Tests Figure 1–35: Line Count Accuracy Test Setup Waveform – TDS 684A Shown Press CURSOR. Press the main-menu Function. Press the side-menu V Bars. Using the General Purpose knob, place the left cursor directly over the trigger ‘T’ icon.
  • Page 90 Use the keypad to set the field rate to 60.05 Hz (press 60.05, then ENTER). Press the side-menu Lines. Use the keypad to set the field rate to 793 lines (press 793, then ENTER). 1–76 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 91 Set PULSE DURATION to 50 ns. Set PERIOD to 10 s. Set OUTPUT (VOLTS) to –1 for LOW LEVEL and +1 for HIGH LEVEL. Depress the COMPLEMENT button. Be sure BACK TERM is depressed (in). 1–77 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 92 Turn the pulse generator OUTPUT (VOLTS) control until the signal on the oscilloscope shows a one division negative going pulse. See Figure 1–38. NOTE. You may need to adjust the trigger level control to obtain a stable trigger. 1–78 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 93 NOTE. The pulse duration and period adjustments are critical in making this measurement. If the pulse duration and/or the duty cycle are not stable, the FLEXFMT function may not function. You must take care when making these adjustments. 1–79 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 94 CONFIRM that the TRIG’D LED is lit and the waveform is stable. Disconnect the signal source from CH1, wait a few seconds, then reconnect the signal. CONFIRM that the TRIG’D LED is lit and the waveform is stable. 1–80 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 95 Performance Tests Disconnect all test equipment (TSG 121) from the digitizing oscilloscope. Press save/recall SETUP, press the main-menu button Recall Factory Setup, and the side-menu OK Confirm Factory Init. 1–81 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 96 Performance Tests 1–82 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 97: Specifications

    Specifications...

  • Page 99: Product Description

    Specifications This section begins with a general description of the traits of the TDS 684A and 744 Digitizing Oscilloscopes. Three sections follow, one for each of three classes of traits: nominal traits, warranted characteristics, and typical characteristics. Product Description The TDS 684A and 744 Digitizing Oscilloscopes are portable, four-channel instruments suitable for use in a variety of test and measurement applications and systems.

  • Page 100: User Interface

    Each of the full-featured channels can be displayed, vertically positioned, and offset, can have their bandwidth limited (250 MHz or 20 MHz) and their vertical coupling specified. Fine gain can also be adjusted. 2–2 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 101: Horizontal System

    In this case, the events source is the delayed-trigger source. The delayed trigger can also be set to occur after a number of events plus an amount of time. 2–3 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 102: Trigger System

    Use sample, envelope, and average modes to acquire signals. (with the TDS 744, also use high-resolution and peak-detect modes) 2–4 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 103: On-Board User Assistance

    (event) of the acquisition. The cursors can also control the portion of the waveform on which automatic measurements are made. For time measurements, units can be either seconds or Hertz (for 1/time). 2–5 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 104 An important component of the multiprocessor architecture of this Digitizing (DSP) Oscilloscope is Tektronix’s proprietary digital signal processor, the DSP. This dedicated processor supports advanced analysis of your waveforms when doing such compute-intensive tasks as interpolation, waveform math, and signal averaging.
  • Page 105 You can output screen information via GPIB, RS-232C, or Centronics interfaces. Display The TDS 684A and 744 Digitizing Oscilloscopes offer flexible display options. You can customize the following attributes of your display: Color: Waveforms, readouts, graticule, and variable persistence with color...
  • Page 106 Specifications 2–8 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 107: Nominal Traits

    Nominal Traits This section contains a collection of tables that list the various nominal traits that describe the TDS 684A and 744 oscilloscopes. Electrical and mechanical traits are included. Nominal traits are described using simple statements of fact such as “Four, all identical”...
  • Page 108 Name Description Range, Sample-Rate TDS 684A; 5 Samples/sec to 5 GSamples/sec on four channels simultaneously TDS 744: 5 Samples/sec to 2 GSamples/sec when acquiring 1 channel to 1 G Sample/sec when acquiring 2 channels, or to 500 MSamples/sec when acquiring 3 or 4 channels...
  • Page 109 Single Graticule: 401 501 pixels, 8 10 divisions, where divisions are 1 cm by 1 cm Waveform Display Colors Sixteen colors in infinite-persistence or variable persistence display with color coding 2–11 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 110 Data is maintained by small lithium-thionyl-chloride batteries internal to the memory ICs. The amount of lithium is so small in these ICs that they can typically be safely disposed of with ordinary garbage in a sanitary landfill. 2–12 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 111 Forced-air circulation with no air filter. Clearance is required. Construction Material Chassis parts constructed of aluminum alloy; front panel constructed of plastic laminate; circuit boards constructed of glass laminate. Cabinet is aluminum and is clad in Tektronix Blue vinyl material. Finish Type...
  • Page 112 Nominal Traits 2–14 TDS 684A & TDS 744 Performance Verification and Specifications...

  • Page 113: Warranted Characteristics

    Warranted Characteristics This section lists the various warranted characteristics that describe the TDS 684A and 744 Digitizing Oscilloscopes. Electrical and environmental characteristics are included. Warranted characteristics are described in terms of quantifiable performance limits which are warranted. NOTE. In these tables, those warranted characteristics that are checked in the procedure Performance Verification appear in boldface type under the column Name.
  • Page 114 Name Description Accuracy, DC Gain TDS 684A: 1.5% for all sensitivities from 2 mV/div to 10 V/div 2.0% at 1 mV/div sensitivity TDS 744: 1% for all sensitivities from 1 mV/div to 10 V/div with offset from 0 V to...
  • Page 115 The limits given are for the ambient temperature range of 0 C to +30 C. Reduce the upper bandwidth frequencies by 5 MHz for the TDS 684A or by 2.5 MHz for the TDS 744 for each C above +30 C.
  • Page 116 Frequency 1 kHz 5% Output Voltage, Signal Out (CH 3 For TDS 684A: 20 mV/division 20% into a 1 M load; 10 mV/division 20% into a 50 load For TDS 744: 22 mV/division 20% into a 1 M load;...
  • Page 117 Meets or exceeds the EMC requirements of the following standards: EN 50082–1 European Community Requirements IEC 801-2 Electrostatic Discharge IEC 801-3 Radiated Susceptibility IEC 801-4 Fast Transients IEC 801-5 AC Surge 2–19 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 118 The GPIB cable connected to the instrument for certain of the emissions tests must be “low EMI” having a high-quality outer shield connected through a low impedance to both connector housings. Acceptable cables are Tektronix part numbers 012-0991-00, -01, -02, and -03. In order to maintain the EMI performance conforming to the above regulations, the following cables, or their equivalent, should be used: a shielded Centronics cable, 3 meters in length, part number 012-1214-00, and a shielded RS-232 cable, 2.7 meters in length, CA part number 0294-9.

  • Page 119: Typical Characteristics

    TDS 744 example: at 4 Gs/s, accuracy = 37.5 ps 100 Averages, Full TDS 684A: ( 10 ps + (100 ppm | Reading |) + (0.25 W Bandwidth selected. TDS 744: 20 ps + 25 ppm | Reading | + t/div/1000...
  • Page 120 The values given are the maximum absolute difference between the value at the end of a specified time interval after the mid-level crossing of the step, and the value one second after the mid-level crossing of the step, expressed as a percentage of the step amplitude. 2–22 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 121 Sensitivities, Pulse-Type Runt Trigger 1 V/div at the BNC input 1.0 division, at vertical settings > 10 mV/div and 1 V/div at the BNC input Sensitivities, Pulse-Type Trigger Width and Glitch 2–23 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 122 Runt 2 ns 2 ns Time-Qualified Runt 2 ns TDS 684A: 8.5 ns + 5% of Width Setting TDS 744: 7 ns + 5% of Width Setting Width 1 ns 2 ns + 5% of Width Upper Limit Setting Slew Rate 600 ps TDS 684A: 8.5 ns + 5% of delta Time...
  • Page 123 For Slew Rate Triggering, this is the minimum transition time, defined to be the time the user’s signal spends between the two trigger threshold settings. 2–25 TDS 684A & TDS 744 Performance Verification and Specifications...
  • Page 124 Typical Characteristics 2–26 TDS 684A & TDS 744 Performance Verification and Specifications...

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