Tektronix TDS 744A Technical Reference
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Tektronix TDS 744A Technical Reference

Tektronix TDS 744A Technical Reference

Digitizing oscilloscope
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Technical Reference
TDS 684A, TDS 744A, & TDS 784A
Digitizing Oscilloscope
Performance Verification and Specifications
070-8990-04
Please check for change information
at the rear of this manual.
Fifth Edition: January 1995

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  • Page 1 Technical Reference TDS 684A, TDS 744A, & TDS 784A Digitizing Oscilloscope Performance Verification and Specifications 070-8990-04 Please check for change information at the rear of this manual. Fifth Edition: January 1995...
  • Page 2 Copyright Tektronix, Inc. 1994, 1995. 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: Table Of Contents

    ........2–21 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 6 Table of Contents TDS 684A, TDS 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 8 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 9 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 10 General Safety Summary TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 11: Preface

    Related Manuals The following documents are related to the use or service of the digitizing oscilloscope: The TDS 684A, TDS 744A, & TDS 784A User Manual (Tektronix part number 070-8991-XX). The TDS Family Programmer Manual (Tektronix part number 070-8709-XX) describes using a computer to control the digitizing oscillo- scope through the GPIB interface.
  • Page 12 Preface viii TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 13: Performance Verification Procedures

    Performance Verification Procedures...
  • Page 15 (See Equipment Required beginning on page 1–16.) If you are not familiar with operating this oscilloscope, read the TDS 684A, TDS 744A, & TDS 784A Reference (070-8999-XX) or the TDS 684A, TDS 744A, & TDS 784A User Manual (070-8991-XX). These contain instructions that will acquaint you with the use of the front-panel controls and the menu system.

  • Page 16: Conventions

    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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 17 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 18 Performance Verification Procedures 1–4 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 19: Brief Procedures

    (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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 20 Confirm signal-path compensation returns passed status: Verify that the word 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 1–6 TDS 684A, TDS 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 22 Figure 1–3: Universal Test Hookup for Functional Tests – TDS 684A Shown 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 23 Refer to the icons at the left of each statement as you confirm those statements. 1–9 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 24 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 744A, & TDS 784A 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 744A, & TDS 784A 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 744A, & TDS 784A 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...

  • Page 29: Prerequisites

    +4 C and either +45 C for the TDS 684A or +50 C for the TDS 7XXA. (The warm-up requirement is usually met in the course of meeting the first prerequisite listed above.) 1–15 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 31 8 V, or errors in signal measurement will be observed. Above 40 V, damage to the probe may result. To make measurements beyond 8 V, use either the P6139A probe (good to 500 V), or refer to the catalog for a recom- mended probe. 1–17 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 32 Performance Tests 1–18 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 33: Tds 684A Test Record

    – 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 35 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 36 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 744A, & TDS 784A Performance Verification and Specifications...

  • Page 37: Tds 7Xxa Test Record

    – 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 39 DELAYED TRIGGER OUTPUT, 50 High High 1.0 V __________ __________ __________ __________ Low 0.25 V DELAYED TRIGGER OUTPUT, 1 M High High 2.5 V __________ __________ __________ __________ Low 0.7 V 1–25 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 40 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 744A, & TDS 784A Performance Verification and Specifications...

  • Page 41: Signal Acquisition System Checks

    Select an unchecked channel: Press WAVEFORM OFF to remove the channel just confirmed from the display. Then, press the front-panel button that corresponds to the channel you are to confirm. 1–27 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 43 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 45 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 47 CH 1. Set the output of the generator to a reference frequency of 6 MHz. See Figure 1–7. 1–33 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 48 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 49 684A/784A = 1 GHz and for the 744A = 500 MHz frequency, you may also want to make small, manual adjustments to the trigger level. You can use the TRIGGER LEVEL knob to do this. 1–35 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • 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 744A, & TDS 784A 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 53 The horizontal SCALE should already be set to 500 ps. On the TDS 784A, now set it to 200 ps. On the TDS 744A, push the front-panel ZOOM button, press the side-menu On button, set the horizontal SCALE to 250 ps, and be sure the vertical scale factor is kept at 1.0X...
  • Page 54 Check against limits: CHECK that the cursor readout on screen is 100 ps for the TDS 684A or 50 ps for the TDS 744A/784A. h. If the channel skew is within the limits, enter time on the test record and proceed to step 3.
  • Page 55 Check against limits: CHECK that the largest of the three results from steps l, m, and n is between –100 ps and + 100 ps for the TDS 684A or between –50 ps and + 50 ps for the TDS 744A/784A. p. Enter time on the test record.

  • Page 56: Time Base System Checks

    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. 1–42 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 57 2.0, for the TDS 684A, or 2.5, for the TDS 7XXA, divisions of center graticule. See Figure 1–12. Enter number of divisions on test record. 1–43 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 58: 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 1–44 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 59 (Horizontal Scale 1 s): a. Display the test signal: Set the output of the sine wave generator for a 100 MHz, five-division sine wave on screen. Press SET LEVEL TO 50%. 1–45 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 60 2.5 ns to 7.5 ns, inclusive, for the TDS 684A or is within 2.5 ns to 6.5 ns, inclusive, for the TDS 7XXA. Enter time on test record. 1–46 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 61 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. 1–47 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 62 Figure 1–15: Initial Test Hookup 1. Install the test hookup and preset the instrument controls: a. Hook up the test-signal source: Set the output of the DC calibration generator to 0 volts. 1–48 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 63 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. 1–49 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 64 (+10 V). Figure 1–16: Measurement of Trigger-Level Accuracy 3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold accuracy: a. Select the Delayed time base: 1–50 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 65 First set the output of the DC calibration generator to 0 volts. b. Disconnect the cable from the generator output at the input connector of CH 1. 1–51 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 66 Connect the signal output of a medium-frequency sine wave generator to a BNC T connector. Connect one output of the T connector to CH 1 through a 50 precision coaxial cable. Connect 1–52 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 67 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 1–53 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 68 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 1–54 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 69 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. 1–55 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 70 –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 & TDS 784A = 1 GHz, for TDS 744A = 500 MHz): a. Hook up the test-signal source: Disconnect the hookup installed in step 1.

  • Page 71: 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: 1–57 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 72 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. 1–58 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 73 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. 1–59 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 74 One DC calibration generator (Item 9) Prerequisites See page 1–15. Also, the Digitizing Oscilloscope must have passed Check Accuracy For Long-Term Sample Rate, Delay Time, and Delta Time Measurements on page 1–42. 1–60 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 75 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. 1–61 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 76 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: 1–62 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 77 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. 1–63 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 78 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. 1–64 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 79: 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. 1–65 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 80 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. 1–66 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 81 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. 1–67 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 82 Toggle the side-menu Ring Bell if Condition Met to OFF. y. Toggle the side-menu Limit Test to OFF. 4. Check Triggered Signal Range. Set up oscilloscope for Triggered Signal Test. a. Press MORE. 1–68 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 83 That is, it 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 1–28. 1–69 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 84 That is, it 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 1–29. 1–70 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 85 SHIFT, m, then ENTER). b. Set up 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. 1–71 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 86 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 1–72 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 87 Also, confirm that the waveform on the screen has one positive pulse and a number of negative pulses. See Figure 1–33. Disconnect all test equipment from the digitizing oscilloscope. 1–73 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 88 Connect a composite output signal from the rear of the PAL signal source (labeled COMPST on the TSG 121) to the CH1 input through a 75 cable and a 75 terminator. See Figure 1–34. 1–74 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 89 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. 1–75 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 90 Use the HORIZONTAL POSITION knob to position the right cursor to center screen. Verify that the cursor is positioned on a positive slope of the burst signal. See Figure 1–36. 1–76 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 91 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). 1–77 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 92 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). 1–78 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 93 See Figure 1–38. NOTE. You may need to adjust the trigger level control to obtain a stable trigger. 1–79 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 94 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. 1–80 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 95 CONFIRM that the TRIG’D LED is lighted and the waveform is stable. Press Sync Polarity. Press Pos Sync. Push the pulse generator COMPLEMENT button out. CONFIRM that the TRIG’D LED is lighted and the waveform is stable. 1–81 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 96 CONFIRM that the TRIG’D LED is lighted and the waveform is stable. Disconnect all test equipment (TSG 121) from the digitizing oscilloscope. Press save/recall SETUP, the main-menu button Recall Factory Setup, and the side-menu OK Confirm Factory Init. 1–82 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 97: Specifications

    Specifications...

  • Page 99: Product Description

    Storage 1.44 Mbyte, 3.5 inch, DOS 3.3-or-later floppy disk. NVRAM storage for saving waveforms, hardcopies, and setups Full GPIB programmability. Hardcopy output using GPIB, RS-232, or Centronics ports 2–1 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • 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 744A, & TDS 784A Performance Verification and Specifications...

  • Page 101: Horizontal System

    (delayed runs after main mode). The delayed display can also be set to display at the first valid trigger after the delay (delayed-triggerable modes). 2–3 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 102: Trigger System

    0% to 100% limits. Acquisition Control You can specify a mode and manner to acquire and process signals that matches your measurement requirements. 2–4 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 103: On-Board User Assistance

    For the H Bars, either cursor can be selected to read out its voltage with respect to any channel’s ground reference level. For the V Bars, the cursors measure time 2–5 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 104: Storage

    Self-compensation and self-diagnostic features built into the Digitizing Oscilloscope to aid in fault detection and servicing are also accessible using commands sent from a GPIB controller. 2–6 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 105: Display

    By invoking zoom, you can magnify the waveform using the vertical and horizontal controls to expand (or contract) and position it for viewing. 2–7 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 106 Specifications 2–8 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

  • Page 107: Nominal Traits

    Fit-to-Screen off. Between coarse settings, the sensitivity can be finely adjusted with a resolution equal to 1% of the more sensitive coarse setting. For example, between 50 mV/div and 100 mV/div, the volts/division can be set with 0.5 mV resolution. 2–9 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 108 Range, Sample-Rate TDS 684A; 5 Samples/sec to 5 GSamples/sec on four channels simultaneously TDS 744A: 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 744A, & TDS 784A 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 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...

  • Page 113: Warranted Characteristics

    The oscilloscope must have had its signal-path-compensation routine last executed after at least a 20 minute warm-up period at an ambient temperature within 5 C of the current ambient temperature. 2–15 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 114 DC – 600 MHz DC – 500 MHz DC – 600 MHz 49.8 mV/div 10 mV/div – DC – 500 MHz DC – 450 MHz DC – 500 MHz 19.9 mV/div 2–16 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 115 TDS 684A: 100 ps for any two channels with equal Volts/Div and Coupling settings Bandwidth TDS 744A/784A: 50 ps for any two channels with equal Volts/Div and Coupling settings Input Impedance, DC–1 M Coupled 0.5% in parallel with 10 pF 3 pF Input Impedance, DC–50...
  • Page 116 TDS 684A: 0.35 division from DC to 50 MHz, increasing to 1 division at 1 GHz TDS 7XXA: 0.35 division from DC to 50 MHz, increasing to 1 division at 500 MHz for the TDS 744A or to 1 division at 1 GHz for the TDS 784A Auxiliary...
  • Page 117 FCC Code of Federal Regulations, 47 CFR, Part 15, Subpart B, Class A European Community Requirements EN 55011 Class A Radiated Emissions EN 55011 Class A Conducted Emissions EN 50081–1 EN60555–2 Power Line Harmonic Emissions 2–19 TDS 684A, TDS 744A, & TDS 784A 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

    600 ps 800 ps 530 ps 2 mV/div – 4.98 mV/ 750 ps 800 ps 600 ns 1 mV/div – 1.99 mV/ 900 ps 890 ns 800 ns 2–21 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • Page 120 The values given are the maximum absolute difference between the value at the end of a specified time interval after the midlevel crossing of the step and the value one second after the midlevel crossing of the step, expressed as a percentage of the step amplitude. 2–22 TDS 684A, TDS 744A, & TDS 784A 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 122 The minimum signal levels required for stable runt pulse triggering of an acquisition. Also, see the footnote for Sensitivity, Edge-Type Trigger, DC Coupled in this table. (Stable counting of events is counting that misses no events.) 2–24 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...
  • 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 744A, & TDS 784A Performance Verification and Specifications...
  • Page 124 Typical Characteristics 2–26 TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications...

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