Tektronix TDS 684A User Manual
Tektronix TDS 684A User Manual

Tektronix TDS 684A User Manual

Digitizing oscilloscopes
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Summary of Contents for Tektronix TDS 684A

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 User Manual TDS 684A, TDS 744A & TDS 784A Digitizing Oscilloscopes 070-8991-02 This document applies for firmware version 1.0 and above.
  • Page 3 Commercial Computer Software – Restricted Rights clause at FAR 52.227-19, as applicable. 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.
  • Page 4 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 German Postal Information Certificate of the Manufacturer/Importer We hereby certify that the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes and all factory-installed options comply with the RF Interference Suppression requirements of Postal Regulation Vfg. 243/1991, amended per Vfg. 46/1992.
  • Page 6 The Netherlands declare under sole responsibility that the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes meet the intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance was demonstrated to the following specifications as listed in the official Journal of the European Communities: EN 50081–1 Emissions:...
  • Page 8 ..........3–70 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 9 ....... . . E–1 Glossary Index TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 10: Table Of Contents

    ..........3–17 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 11 ....3–73 Figure 3–45: Main Trigger Menu — Runt Class ....3–75 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 12 ......3–135 Figure 3–82: Comparing a Waveform to a Limit Template ..3–137 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 13 ..... . . E–2 Figure E–2: A6303 Current Probe Used in the AM 503S Opt. 03 . . . E–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 14 ....... A–5 Table D–1: Factory Initialization Defaults ..... . D–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 15 Table of Contents viii TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 16 To avoid electric shock and erroneous readings, keep probe surface clean. 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 User Manual...
  • Page 17 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 User Manual...
  • Page 18 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 744A, & TDS 784A User Manual...
  • Page 19 General Safety Summary TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 20 Preface This is the User Manual for the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes. The chapter Getting Started briefly describes the TDS Oscilloscope, prepares you to install it, and tells you how to put it into service.
  • Page 21 Default Model This manual documents the TDS 684A, TDS 744A, and TDS 784A Digitizing Oscilloscopes. However, the TDS 684A display screen appears as the default screen wherever a display screen is illustrated in this manual. Also, this manual uses the name “TDS 700A”...
  • Page 22 Getting Started...
  • Page 23: Table 1-1: Key Features Of The Tds Oscilloscopes

    Product Description The Tektronix TDS Oscilloscope is a superb tool for acquiring, displaying, and measuring waveforms. Its performance addresses the needs of both benchtop lab and portable applications with the following features: Table 1–1: Key Features of the TDS Oscilloscopes...
  • Page 24 Hardcopy output using GPIB, RS-232, or Centronics ports Product Specification The product specification is found in the technical reference TDS 684A, TDS 744A, & TDS 784A Performance Verification and Specifications that is shipped as a standard accessory with the TDS Oscilloscope.
  • Page 25 The TDS 744A Oscilloscope ships with four general-purpose, P6139A 500 MHz passive probes. The TDS 684A and TDS 784A Oscilloscopes ship without probes. To take advantage of the higher bandwidth of the TDS 684A and TDS 784A Oscilloscopes, order the P6245 Active Probe. See Appendix A: Options and Accessories in this manual for more information on optional-acces- sory probes for all three oscilloscope models.
  • Page 26: Figure 1-1: Rear Panel Controls Used In Start Up

    1. Be sure you have the appropriate operating environment. Specifications for temperature, relative humidity, altitude, vibrations, and emissions are included in the TDS 684A, TDS 744A, & TDS 784A Performance Verifica- tion and Specifications manual (Tektronix part number 070-8990-xx). 2. Leave space for cooling. Do this by verifying that the air intake and exhaust holes on the sides of the cabinet (where the fan operates) are free of any airflow obstructions.
  • Page 27: Figure 1-2: On/Stby Button

    2. If the oscilloscope is not powered on (the screen is blank), push the front-panel ON/STBY button to toggle it on (see Figure 1–2). ON/STBY Button Figure 1–2: ON/STBY Button 1–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 28 If the self test fails, call your local Tektronix Service Center. Depending on the type of failure, you may still be able to use the oscilloscope before it is serviced.
  • Page 29 Operating Basics...
  • Page 30 Example 4: Saving Setups To explore these topics in more depth and to read about topics not covered in this section, see Reference. A list of the topics covered begins on Page 3–1. 2–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 31 Overview 2–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 32 Front Panel Map — Left Side File System, page 3–117 Side Menu Buttons, page 2–7 CLEAR MENU Removes Menus from the Display ON/STBY Switch, Main Menu Buttons, page 1–5 page 2–7 2–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 33 Vertical Controls, page 3–10 Zoom, page 3–37 Ground Triggering, page 3–49 Delay Triggering, page 3–80 Edge Triggering, page 3–57 Horizontal Controls, Logic Triggering, page 3–60 page 3–13 Pulse Triggering, page 3–70 2–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 34 (Provides Analog Signal Output) AUX TRIGGER INPUT – (Provides Auxiliary Trigger Signal Input) MAIN TRIGGER OUTPUT – (Provides Main Trigger (TTL) Output) DELAYED TRIGGER OUTPUT – (Provides Delayed Trigger (TTL) Output) 2–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 35 Vertical scale, Trigger parameters, page 3–10 page 3–55 The main menu with Horizontal scale and time choices of major actions base type, page 3–13 2–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 36 Press one of these buttons to select from side menu (if displayed). If side menu item has an adjustable value (shown in reverse video), adjust it with the general purpose knob or keypad. 2–7 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 37 Press it again screen. to make selection. Alternatively, press SHIFT first to make selection in the opposite direction. A pop-up selection changes the other main menu titles. 2–8 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 38: Figure 2-1: Connecting A Probe For The Examples (P6245 Shown)

    Then, using an appropriate probe (such as the P6245), connect from the CH 1 connector of the oscilloscope to the PROBE COMPENSATION connectors. (See Figure 2–1.) Signal Figure 2–1: Connecting a Probe for the Examples (P6245 shown) 2–9 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 39: Figure 2-2: Setup Button Location

    OK Confirm Factory Init Menu Item and Button Recall Factory Setup Menu Item and Button Figure 2–3: The Setup Menu 2. Press the button directly below the Recall Factory Setup menu item. 2–10 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 40: Figure 2-4: Trigger Controls

    The trigger level bar shows that the waveform is triggered at a level near 50% of its amplitude (from step 4). The trigger position indicator shows that the trigger position of the waveform is located at the horizontal center of the graticule. 2–11 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 41: Figure 2-5: The Display After Factory Initialization

    Right now, the channel, time base, and trigger readouts appear in the graticule area because a menu is displayed. You can press the CLEAR MENU button at any time to remove any menus and to move the readouts below the graticule. 2–12 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 42: Figure 2-6: The Vertical And Horizontal Controls

    3. Turn the horizontal SCALE knob one click clockwise. Observe the time base readout at the bottom of the display. The time base should be set to 200 s/div now, and you should see two complete waveform cycles on the display. 2–13 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 43: Figure 2-7: Trigger Controls

    Leave the trigger level in that untriggered state. MAIN LEVEL Knob Figure 2–7: TRIGGER Controls 2. Press AUTOSET (see Figure 2–8) and observe the stable waveform display. AUTOSET Button Figure 2–8: AUTOSET Button Location 2–14 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 44: Figure 2-9: The Display After Pressing Autoset

    The TDS Oscilloscope can display up to four channels, three math waveforms, and four reference waveforms at one time. Do the following tasks to learn how to display and control more than one waveform at a time. 2–15 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 45: Figure 2-11: The Channel Buttons And Lights

    The channel readout on the display now shows the settings for both Ch1 and Ch2. There are two channel indicators at the left edge of the graticule. Right now, they overlap. 2–16 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 46: Figure 2-12: The Vertical Main Menu And Coupling Side Menu

    That channel always matches the lighted channel button. Side Menu Title Ch2 Reference Indicator Figure 2–12: The Vertical Main Menu and Coupling Side Menu 2–17 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 47: Figure 2-13: The Menus After Changing Channels

    If the waveform you want to remove is not already selected, select that channel using the channel (CH) button. 1. Press WAVEFORM OFF (under the vertical SCALE knob). 2–18 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 48 Observe that the frequency measurement appears within the right side of the graticule area. The measurement readout includes the notation Ch1, meaning that the measurement is taken on the channel 1 waveform. (To take a 2–19 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 49: Figure 2-14: Measure Main Menu And Select Measurement Side Menu

    (you can also remove them, as a group), do the following step: 1. Press MEASURE Remove Measrmnt (main) Measurement 1, Measurement 2, and Measurement 4 (side) to remove those measurements. Leave the rise time measurement displayed. 2–20 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 50: Figure 2-15: Four Simultaneous Measurement Readouts

    Turn the general purpose knob left and right, and then use it to adjust the high level to 80%. That sets the high measurement reference to 80%. 2–21 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 51: Figure 2-16: General Purpose Knob Indicators

    20%. Observe that the rise-time value has changed. 3. Press Remove Measrmnt (main) All Measurements (side). That returns the display to its original state. 2–22 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 52: Figure 2-17: Snapshot Of Channel 1

    Figure 2–17: Snapshot of Channel 1 2. Press Again (side) to do another snapshot and update the snapshot measure- ments. 2–23 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 53 (and losing forever) a saved setup, choose a setup location labeled factory. (Setup locations labeled factory have the factory setup stored as a default and can be used to store current setups without disturbing previously stored setups.) 2–24 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 54: Figure 2-18: Save/Recall Setup Menu

    The step just performed completes the examples. You can restore the default settings by pressing SETUP Recall Factory Setup (main) OK Confirm Factory Init (side). 2–25 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 55 Tutorial 2–26 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 56 Reference...
  • Page 57 ....... . . 3–33 3–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 58 ........3–165 3–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 59 Tektronix recommends you order the P6245 active probe to take advantage of the 1 GHz bandwidth of these two oscilloscopes. Tektronix also offers a variety of BNC cabling and connectors to couple a variety of signal sources to its input channels. See your Tektronix Sales representative for the specific items offered for signal coupling.
  • Page 60: Figure 3-1: How Probe Compensation Affects Signals

    7. Adjust the probe until you see a square wave with a perfectly flat top on the display. Figure 3–2 shows where the adjustment is located. Figure 3–2: P6139A Probe Adjustment 3–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 61 Autoset automatically sets up the front panel controls based on the characteristics of the input signal. It is much faster and easier than a manual control-by-control setup. Autoset adjusts controls in these categories: Acquisition, Display, Horizontal, Trigger, and Vertical. 3–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 62: Table 3-1: Autoset Defaults

    Centered within the graticule window Horizontal Scale As determined by the signal frequency Horizontal Time Base Main Only Horizontal Record Length Unchanged Horizontal Lock Unchanged InstaVu Acquisitions Unchanged (TDS 700A Models Only) Limit Test 3–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 63 You can select a channel waveform, a math waveform, or a reference waveform. This subsection describes how to select a waveform and how you can turn the display of a waveform off. 3–7 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 64: Figure 3-3: The Channel Readout

    Trigger menu. 2. Press WAVEFORM OFF to turn OFF the display of the selected channel waveform. It will also remove from the display any automated measurements being made on that waveform. 3–8 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 65: Figure 3-4: Waveform Selection Priority

    To Check Position To quickly see the position of the waveform in the display, check the Channel Reference and the Record View icons. (See Figure 3–5.) 3–9 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 66: Figure 3-5: Scaling And Positioning

    To change the vertical scale and position: 1. Turn the vertical SCALE knob. Note only the scale of the selected wave- form changes. 3–10 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 67: Figure 3-6: Vertical Readouts And Channel Menu

    By adjusting the vertical position, you can move the waveform up or down on the display. Adjustment of vertical position is particularly useful when you are comparing two or more waveforms. 3–11 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 68 Press Set to 0 divs (side) if you want to reset the reference point of the selected waveform to the center of the display. 3–12 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 69: Figure 3-7: Record View And Time Base Readouts

    By changing the horizontal scale, you can move the waveform right or left to see different portions of the waveform. That is particularly useful when you are using larger record sizes and cannot view the entire waveform on one screen. 3–13 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 70: Figure 3-8: Horizontal Controls

    Trigger Position. The trigger point marks time zero in a waveform record. All record points before the trigger event make up the pretrigger portion of the waveform record. Every record point after the trigger event is part of the 3–14 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 71 2,500, 5,000, 15,000, and 50,000 plus, with option 1M, 75,000, 100,000, 130,000, 250,000, and 500,000. Option 1M is available only at the time of original purchase and is not available for the TDS 684A. NOTE. TDS 700A Models: Hi Res acquisition mode requires twice the acquisition...
  • Page 72 The sampled and digitized points are stored in memory along with corresponding timing information. You can use this digital representation of the signal for display, measurements, or further processing. 3–16 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 73: Figure 3-9: Acquisition: Input Analog Signal, Sample, And Digitize

    Real-time Sampling The two general methods of sampling are real-time and equivalent-time. The TDS 684A Oscilloscope uses only real-time sampling; the TDS 700A Oscillo- scopes use both real- and equivalent-time sampling. In real-time sampling, the oscilloscope digitizes all the points it acquires after one trigger event (see Figure 3–11).
  • Page 74 Acquiring and Displaying Waveforms Equivalent-Time Sampling A TDS 700A model oscilloscope (the TDS 684A uses only real time sampling) uses equivalent time sampling to extend its sample rate over its real-time maximum sampling rate, but only under two conditions: You must have turned equivalent-time on in the Acquisition menu.
  • Page 75: Table 3-2: How Interleaving Affects Sample Rate

    The situation just described occurs if you set the Horizontal SCALE knob to a time base setting that is faster than 10 ns (TDS 684A). (The setting varies with the number of channels for TDS 700A models; see Tables 3–4 and 3–5 begin- ning on page 3–24.) The oscilloscope then interpolates to create the intervening...
  • Page 76 This mode reduces random noise. The oscilloscope acquires data after each trigger event using Sample mode. It then averages the record point from the current acquisition with those stored from previous acquisitions. 3–20 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 77 Calculates average value for Uses Sample Mode for Each Acquisition each record point over many acquisitions Use to reduce apparent noise in a repetitive signal. Figure 3–13: How the Acquisition Modes Work 3–21 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 78: Table 3-3: Additional Resolution Bits

    5 s to 10 s 11 bits 20 s to 50 s 12 bits 100 s to 200 s 13 bits 500 s 14 bits 1 ms and slower 15 bits 3–22 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 79 1. Press SHIFT ACQUIRE MENU Mode (main). (See Figure 3–14.) 2. TDS 684A: Press Sample, Envelope, or Average (side) or ... TDS 700A Models: Press Sample, Peak Detect, Hi Res, Envelope, or Average (side). (InstaVu mode must be off to use Hi Res, Envelope, or Average modes.)
  • Page 80: Table 3-4: Tds 744A Sampling Mode Selection

    25 ns Real-time Equiv.-time or interpolate Equiv.-time or interpolate 25 ns Equiv.-time or Interpolate Equiv.-time or Interpolate Equiv.-time or Interpolate “ ” means “slower than”; “ ” means “faster than.” 3–24 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 81: Table 3-5: Tds 784A Sampling Mode Selection

    Single Acquisition Sequence, or Limit Test Condition Met (side). (See Figure 3–15.) (TDS 700A models only: single acquisition and limit testing are ignored in InstaVu mode; see Incompatible Modes on page 3–45.) Figure 3–15: Acquire Menu — Stop After 3–25 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 82 TRIG’D is lighted. Aliasing occurs because the oscilloscope cannot sample the signal fast enough to construct an accurate waveform record. (See Figure 3–16.) 3–26 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 83 Customizing the Display The TDS Oscilloscope can display waveform records and other display elements in different ways. This subsection describes how to adjust the oscilloscope display style, intensity level, graticule, and format. 3–27 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 84 See Choose a Palette on page 3–33. Infinite Persistence style accumulates the record points until you change some control (such as scale factor) causing the display to be erased. 3–28 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 85 The options also control what style trigger level bar, long or short, is displayed. 1. TDS 684A: Press DISPLAY Readout Options (main). TDS 700A Models: Press DISPLAY Mode (main) Normal (pop-up) Format/RO (main). 3–29 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 86 4. Press Display Date/Time (side) to turn it on or off. Push Clear Menu to see the current date and time. Trigger Point Indicator Trigger Bar—Long Style -or- Trigger Bar—Short Style Figure 3–18: Trigger Point and Level Indicators 3–30 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 87 NOTE. When the horizontal scale is set to the faster rates (10 ns/div for the TDS 684A; see Tables 3–4 and 3–5 beginning on page 3–24 for rates specific to the two TDS 700A models) or when using the ZOOM feature to expand waveforms horizontally, interpolation occurs.
  • Page 88: Table 3-6: Xy Format Pairs

    XY. NOTE. Use of XY at higher room temperatures or with higher intensity display formats, such as the white fields in the Hardcopy palette, can temporarily degrade display quality. 3–32 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 89 Change the Display Settings on page 3–28. Choose a Palette To choose a palette of 13 colors from a menu of preset palettes: 1. Choose the starting palette by selecting Palette from the main menu. 3–33 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 90 5. Choose Lightness from the side menu and use the general purpose knob or keypad to select the lightness you desire. A value of 0 results in black. A value of 50 provides the nominal color. A value of 100 results in white. 3–34 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 91 To return to the factory defaults, select Reset to Factory Color. Set Reference Waveform To define reference waveform colors: Color 1. Press Map Reference in the main menu. (See Figure 3–21.) 3–35 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 92 2. Select the object(s) you want to restore by pressing Reset Current Palette To Factory, Reset All Palettes To Factory or Reset All Mappings To Factory in the side menu. 3–36 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 93 Also, the oscilloscope only positions the selected waveform when in Zoom. When zooming horizontally, Zoom expands either the selected waveform, all live waveforms, or all live and reference waveforms, depending on the setting for Horizontal Lock in the Zoom menu. 3–37 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 94 Or press MORE and select a math or reference waveform from the More menu. 2. Press ZOOM. 3. TDS 684A only: Press ON (side) in the Zoom menu. The ZOOM front-panel button should light up. TDS 700A models only: Press ZOOM Mode (main) ON (side).
  • Page 95 (the top one) changes size. Figure 3–23: Zoom Mode with Horizontal Lock Set to None 6. TDS 684A only: Press Horizontal Lock (side) to choose which waveforms to zoom horizontally. Repeatedly press Horizontal Lock (side) to cycle through the three choices.
  • Page 96 Note that as you scale or move the magnified waveform, the oscilloscope scales or moves the box relative to the unmagnified waveform, so the box encloses only the waveform portion magnified in the upper graticule. 3–40 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 97 The horizontal zoom and scale factors determine the minimum offset time available. Both zoom boxes always enclose equal amounts of time with the second box always offset from the first by a time equal to one box. Doubling the 3–41 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 98 You can also adjust the waveform relative to the zoom boxes by selecting the lower graticule and adjusting the vertical and horizontal control knobs. See Using Dual Window Mode on page 3–40. 3–42 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 99 Mode (main). Push Mode again to toggle to InstaVu mode. (See Figure 3–27.) To turn InstaVu off, press InstaVu. Alternatively, press DISPLAY Mode (main), and then press Mode again to toggle to Normal mode. 3–43 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 100 Memory Memory Bit Map Bit Map Bit Map Variable Persistence Updated Variable Updated Variable Display Persistence Display Persistence Display Figure 3–26: Normal DSO Acquisition and Display Mode Versus InstaVu Mode 3–44 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 101 Time in the side menu to the settings desired. Incompatible Modes Several modes/features are unavailable when InstaVu mode is selected: Auto trigger, FastFrame, Limit Testing, XY display, and Zoom modes 3–45 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 102 For example, FastFrame would let you store 10 records of 500 samples each into one record with a 5000 sample length. Real Time Fast Frame Figure 3–28: Fast Frame 3–46 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 103 If you shift the waveform right or left with the front-panel HORIZONTAL POSITION knob, the window next to the side-menu Frame button will indicate the frame number of the waveform at the center of the screen. 3–47 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 104 You can also see the current sequence by pressing the RUN/STOP button to stop the acquisition. 3–48 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 105 (See Figure 3–30.) The oscilloscope has four types of triggers: edge, logic, pulse, and, with option 5, video. Triggered Waveform Untriggered Waveforms Figure 3–30: Triggered Versus Untriggered Displays 3–49 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 106 Triggering occurs when the Boolean conditions are satisfied. A third class, setup/hold, triggers when data in one trigger source changes state within the setup and hold times that you specify relative to a clock 3–50 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 107 A digital pulse train is a good example of a complex waveform. (See Fig- ure 3–31.) Each pulse looks like any other, so many possible trigger points exist. 3–51 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 108 To help you visualize the trigger position setting, the top part of the display has an icon indicating where the trigger occurs in the waveform record. You select in the Horizontal menu what percentage of the waveform record will contain pretrigger information. 3–52 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 109 (See Figure 3–33.) The trigger readout and status screen lets you quickly determine the state of the trigger system. You use the following trigger controls and readouts for all trigger types except where noted. 3–53 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 110 The oscilloscope recognizes and acts upon FORCE TRIG even when you press it before the end of pretrigger holdoff. However, the button has no effect if the acquisition system is stopped. 3–54 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 111 Trigger Readout. To quickly determine the settings of some key trigger parame- ters, check the Trigger readout at the bottom of the display. (See Figure 3–34.) The readouts differ for edge, logic, and pulse triggers. 3–55 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 112 Trigger Position and Level Indicators. To see the trigger point and level on the waveform display, check the graphic indicators Trigger Position and Trigger Bar. Figure 3–35 shows the trigger point indicator and trigger level bar. 3–56 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 113 (See Figure 3–36.) Main Trigger Main Trigger Main Time Base Time/Div Slope = Rising Edge Source = Ch 1 Main Trigger Main Time Base Level Figure 3–36: Edge Trigger Readouts 3–57 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 114 HF Rej removes the high frequency portion of the triggering signal. That allows only the low frequency components to pass on to the triggering system to start an acquisition. High frequency rejection attenuates signals above 30 kHz. 3–58 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 115 You can set holdoff from 250 ns (minimum holdoff available) to 12 seconds (maximum available). See Holdoff, Variable, Main Trigger in the TDS 684A, TDS 744A, and TDS 784A Performance Verification and Specifications manual for typical minimum and maximum values.
  • Page 116 The TDS Oscilloscope can trigger on a logic or binary pattern and on the state of a logic pattern at the time it is clocked. It can also trigger on data that violates 3–60 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 117 Table 3–7 are met. (Goes TRUE or Goes FALSE must be set in the Trigger When menu. The other settings in that menu are described in To Define a Time Qualified Pattern Trigger on page 3–66.) 3–61 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 118: Table 3-7: Pattern And State Logic

    Positive settings for both setup and hold times (the most common application) locate the setup/hold violation zone so it spans the clocking edge. (See the top waveform in Figure 3–38.) The oscilloscope detects and triggers on data that 3–62 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 119 Figure 3–38: Violation Zones for Setup/Hold Triggering Negative settings for setup or hold times skew the setup/hold violation zone to locate it before or after the clocking edge. (See the bottom and center waveforms 3–63 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 120 (Pages 3–60 through 3–62 describe how pattern triggers work.) To use pattern triggering, do the procedures that follow: Select Pattern Triggering. Press TRIGGER MENU Type (main) Logic (pop-up) Class (main) Pattern (pop-up). 3–64 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 121 Class (main) Pattern (pop-up) Set Thresholds (main) Ch1, Ch2, Ch3, or Ch4 (side). 2. Use the MAIN TRIGGER LEVEL knob, the general purpose knob, or the keypad to set each threshold. 3–65 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 122 TRUE within the time you specify. The oscilloscope determines the trigger point in the following manner: It waits for the logic condition to become TRUE. It starts timing and waits for the logic function to become FALSE. 3–66 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 123 Define Inputs. To set the logic state for each of the input channels (Ch1, Ch2, ...): 1. Press TRIGGER MENU Type (main) Logic (pop-up) Class (main) State (pop-up) Define Inputs (main). 3–67 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 124 Class (main) Setup/Hold (pop-up) Data Source (main). 2. Press any one of Ch1, Ch2, Ch3, or Ch4 (side). Do not select the same channel for both the data and clock sources. 3–68 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 125 2. Turn the general purpose knob or use the keypad to set values for the setup and for the hold times. NOTE. Keep hold time to at least 2 ns less than the clock period or the oscillo- scope cannot trigger. 3–69 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 126 These capabilities makes the oscilloscope suitable for such tasks as unattended monitoring for, and capturing of, a power supply glitch or GO/NO GO slew rate testing of operational amplifiers. This 3–70 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 127: Table 3-8: Pulse Trigger Definitions

    Triggering occurs if the oscilloscope detects negative spike widths less than the specified glitch time. Glitch either Triggering occurs if the oscilloscope detects positive or negative widths less than the specified glitch time. 3–71 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 128 (or wider) in width than some specified time. To set up for glitch triggering, do the following procedures. Select Glitch Triggering. Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Glitch (pop-up). 3–72 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 129 Set to Accept or Reject Glitch. To specify whether to trigger on glitches or ignore glitches, press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Glitch (pop-up) Glitch (main) Accept Glitch or Reject Glitch (side). 3–73 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 130 Select the Polarity. To specify the direction of the runt pulse: Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Runt (pop-up) Polarity (main) Positive, Negative, or Either (side). Positive looks for positive-going runt pulses. 3–74 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 131 1. Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Runt (pop-up) Thresholds (main). 2. Use the general purpose knob or keypad to set the values for the high and low thresholds. 3–75 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 132 Select the Polarity. Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Width (pop-up) Polarity (main) Positive or Negative (side). 3–76 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 133 Select Polarity. To specify the direction of the pulse edge, press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Slew Rate (pop-up) Polarity (main) Positive, Negative, or Either (side). 3–77 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 134 Set to Trig When. The oscilloscope compares the pulse edge of the trigger source against the slew rate setting read out in the Trigger When menu. To select 3–78 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 135 Components of Pulse Edge—dv and dt Trigger Bar at Upper Threshold Trigger Point at Second Crossing Trigger Bar at Lower Threshold Figure 3–46: Main Trigger Menu — Slew Rate Class 3–79 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 136 You can only use delay with respect to the main 3–80 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 137 Refer to Figure 3–49 for a more detailed look at how delayed records are placed in time relative to the main trigger. 3–81 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 138 Main Trigger Point Main Trigger Source Delayed Trigger Source Time Delay Start Posttrigger Acquisition Waiting for nth Event (From Delay Trig Menu) (Where n=4) Figure 3–49: How the Delayed Triggers Work 3–82 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 139 Main Trigger menu settings are eliminated. (See the steps at the beginning of this procedure.) If such is the case, the Delayed Triggerable menu item is dimmer than other items in the menu. 3–83 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 140 Hint: You can go directly to the Delayed Trigger menu. (See step 6.) By selecting one of Triggerable After Time, Events, or Events/Time, the oscilloscope automatically switches to Delayed Triggerable in the Horizontal 3–84 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 141 At 100 mV (the next smaller setting after 200 mV) the trigger range is 1.2 V which is smaller than the typical TTL (+1.4 V) or ECL (–1.3 V) level. 3–85 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 142 Triggering on Waveforms 3–86 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 143 Because automatic measurements use the waveform record points, they are generally more accurate and quicker than cursor and graticule measurements. The oscilloscope will continuously update and display these measurements. 3–87 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 144: Table 3-9: Measurement Definitions

    Calculated using either the min/max or the histogram method. The min/max method uses the maximum value found. The histogram method uses the most common value found above the mid point. Measured over the entire waveform or gated region. 3–88 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 145 Low Ref value (default = 10%) to a High Ref value (default = 90%) of its final value. Voltage measurement. The true Root Mean Square voltage over the entire waveform or gated region. 3–89 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 146 You can only take a maximum of four measurements at a time. To add a fifth, you must remove one or more of the existing measurements. To vary the source for measurements, simply select the other channel and then choose the measurements you want. 3–90 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 147 (This section is called the gated region.) Do the following steps to gate a measurement: 1. Press MEASURE Gating (main) Gate with V Bar Cursors (side). (See Figure 3–54.) 3–91 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 148 Press MEASURE High-Low Setup (main) Histogram or Min-Max (side). If you select Min-Max, you may also want to check and/or revise values using the Reference Levels main menu. 3–92 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 149 RS-232-C circuit, set the levels precisely to RS-232-C specification voltage values by defining the high and low references in units. Figure 3–55: Measure Menu — Reference Levels 3–93 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 150 The steps just performed select the waveform you want to measure to; note that the waveform you are measuring delay from is the selected waveform. (See Figure 3–56.) Figure 3–56: Measure Delay Menu — Delay To 3–94 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 151 2. Press either SNAPSHOT (main) or AGAIN (side) to take another snapshot. NOTE. The Snapshot display tells you the channel that the snapshot is being made on. 3. Push Remove Measrmnt. 3–95 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 152 Use High-Low Setup (page 3–92), Reference Levels (page 3–93), and Gated Measurements (page 3–91) with Snapshot exactly as you would when you display individual measurements from the Select Measrmnt menu. 3–96 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 153 X. The Xs measures vertical parameters (typically volts); the long vertical bars measure horizontal parameters (typically time or frequency). (See Cursor Readouts on page 3–98 for more information.) 3–97 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 154 The value after @ shows the time (frequency) of the selected cursor relative to the trigger point. With the video trigger option, you can also display the line number. 3–98 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 155 To select the type of cursors you want, do the following steps: 1. To display the cursor menu, press CURSOR. (See Figure 3–60.) 2. Press Function (main) H Bars, V Bars, Paired, or Off (side). 3–99 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 156 To adjust both cursors in tracking mode, use the general purpose knob to move both cursors. To adjust the distance between cursors in tracking mode, press SELECT to temporarily suspend cursor tracking. Then use the general purpose knob to 3–100 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 157 For example, you might look at a waveform amplitude and say “it is a little more than 100 mV.” This section briefly describes how to take graticule measurements. 3–101 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 158 The TDS Oscilloscope lets you compensate the internal signal path used to Compensation acquire the waveforms you measure. SPC optimizes the oscilloscope capability to make accurate measurements based on the ambient temperature. 3–102 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 159 Pass or Fail in the main menu. 5. Verify the word Pass appears under Signal Path in the main menu. (See Figure 3–62.) 3–103 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 160 50 mV offset). If these errors are within specified limits for your probe, you may want to use another probe. If they are not within specification, have your probe checked by service personnel. 3–104 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 161 8. Connect the probe tip to PROBE COMPENSATION SIGNAL; connect the probe ground lead to PROBE COMPENSATION GND. 9. Press OK Compensate Gain (side). 10. Wait for gain compensation to complete (one to three minutes). 3–105 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 162 11. If the Probe Offset Compensation message is displayed, continue with step 15; otherwise, continue with step 12. 12. If the Compensation Error message is displayed, continue with step 13; otherwise continue with step 18. 3–106 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 163 If you execute a successful Probe Cal on an input channel, the oscilloscope stores the compensation data it derived in nonvolatile memory. Therefore, this data is available when you turn the oscilloscope off and back on and when you change probes. 3–107 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 164 Probe Cal, the oscilloscope cannot determine whether it is the same probe. Therefore, it displays the Re-use Probe Calibration data? menu. (See Figure 3–64.) Figure 3–64: Re-use Probe Calibration Data Menu 3–108 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 165: Table 3-10: Probe Cal Status

    Some optical probes and most active probes (such as the P6205) have TEKPROBE interfaces. 3–109 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 166 Measuring Waveforms 3–110 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 167 STOP. Before doing step 2 that follows, note that if you choose a setup location labeled user, you will overwrite the user setup previously stored there. You can store setups in setup locations labeled factory without disturbing previously stored setups. 3–111 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 168 Only files with .set extensions will be displayed. Finally, press Recall From Selected File (side) to complete the operation. Figure 3–65: Save/Recall Setup Menu 3–112 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 169 To run file utilities, see the Managing the File System on page 3–117. To Find More Information See Example 4: Saving Setups, on page 2–24. See Appendix D: Factory Initialization Settings on page D–1. 3–113 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 170 TEK?????.WFM for storing waveforms. Selecting this file in step 3 stores a waveform in a uniquely named, sequentially numbered file. For instance, the oscilloscope saves the first waveform you save in the file TEK00001.WFM, the second in TEK00002.WFM, and so on. 3–114 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 171 Secure. See To Delete All Setups and Waveforms on page 3–113. Figure 3–66: Save Waveform Menu To Display a To display a waveform in internal reference memory: Saved Waveform Press MORE Ref1, Ref2, Ref3, or Ref4 (main). (See Figure 3–67.) 3–115 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 172 If you enable both autosave and single sequence, the oscilloscope will save all live channels to reference waveforms at the completion of each single sequence event. All previous reference waveform data will be erased. 3–116 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 173 Save/Recall Waveform menu, or press the SHIFT HARDCOPY button to bring up the Hardcopy menu. 2. Press File Utilities in the main menu to bring up the File Utilities side menu. (See Figure 3–68.) 3–117 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 174 Then, press the side menu Rename button. (See Figure 3–69). The labeling menu should appear. Turn the general purpose knob or use the main-menu arrow keys to select each letter. Press Enter Char from the main 3–118 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 175 The device (printer) receiving the file must be capable or printing the particular file format. To Create a Directory To create a new directory, press the side menu Create Directory button. 3–119 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 176 This subsection describes how to do these tasks and how to save a hardcopy to a floppy disk. 3–120 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 177 EPS Mono and Color formats are compatible with Tektronix Phaser Color Printers, HPGL is compatible with the Tektronix HC100 Plotter, and Epson is compatible with the Tektronix HC200 Printer. 3–121...
  • Page 178 EPS Mono Img, EPS Color Img, EPS Mono Plt, EPS Color Plt, Interleaf, or HPGL (side). (Press –more– (side) to page through all of these format choices.) 3. Press SHIFT HARDCOPY MENU Layout (main) Landscape or Portrait (side). (See Figure 3–71.) 3–122 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 179 (See Figure 3–72.) (The date and time are removed from the display when menus are displayed.) 4. Once the oscilloscope is connected to a hardcopy device, press HARDCO- PY to print your date/time stamped hardcopy. 3–123 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 180 When current time catches up to the time you have set, pressing Ok Enter Date/Time (side) synchronizes the set time to the current time. 5. Press CLEAR MENU to see the date/time displayed with the new settings. 3–124 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 181 (See Figure 3–73.) Some devices, such as the Tektronix HC100 Plotter, use the GPIB interface. Many printers, such as the Tektronix HC200, use Centronics interfaces. Many hardcopy devices, including the HC100 and HC200 with option 03, provide RS-232 support.
  • Page 182 Saving files to the floppy disk provides a convenient way to store hardcopies. You can print hardcopies stored on disk at a site remote from where the hardcopies were captured using another TDS oscilloscope. Or you might load 3–126 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 183 GPIB Cable RS-232 Cable Figure 3–74: Print. If your controller is PC-compatible and it uses the Tektronix GURU S3FG210 (National Instruments GPIB-PCII/IIA) GPIB package, do the following steps to print a hardcopy: 1. Use the MS-DOS cd command to move to the directory that holds the software that came with your GPIB board.
  • Page 184 This subsection explains how to prepare and setup the oscilloscope for control and operation over the IEEE Std 488.2-1987 (GPIB) interface. 3–128 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 185 Status and event reporting To simplify the development of GPIB systems, include instruments that use Tektronix defined codes and formats for messages that travel over the GPIB. Each device that follows these codes and formats, such as this oscilloscope, supports standard commands. Use of instruments that support these commands can greatly simplify development of GPIB systems.
  • Page 186 Obtain the Proper Interconnect Cabling. To connect the oscilloscope to a GPIB network, obtain at least one GPIB cable. Connecting two GPIB devices requires an IEEE Std 488.1-1987 GPIB cable (available from Tektronix, part number 012-0991-00). The standard GPIB cable connects to a 24-pin GPIB connector located on the rear panel of the oscilloscope.
  • Page 187 Pressing HARDCOPY with the port configured any other way causes an error, and the oscilloscope responds with a message saying the selected hardcopy port is currently unavailable. Off Bus disconnects the oscilloscope from the bus. 3–131 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 188 Saving Waveforms and Setups GPIB Configuration Menu Figure 3–78: Utility Menu To Find More Information See Printing a Hardcopy, on page 3–120. See the TDS Programmer Manual, Tektronix part number 070-8709-XX. 3–132 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 189 I/O displays information about the I/O port(s). Displaying the Banner To display the banner (lists firmware version, options, copyright, and patents): Press SHIFT STATUS Banner (main). (See Figure 3–80.) 3–133 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 190 Determining Status and Accessing Help Firmware Version Figure 3–79: Status Menu — System Figure 3–80: Banner Display 3–134 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 191 HELP button was first pressed. If you are in help mode and want to see help on selections from menus not displayed, you first exit help mode, display the menu you want information on, and press HELP again to re-enter help mode. 3–135 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 192 Determining Status and Accessing Help 3–136 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 193 (See Figure 3–82.) When it finds such a waveform, the oscilloscope can generate a hardcopy, ring a bell, and stop and wait for your input. Figure 3–82: Comparing a Waveform to a Limit Template 3–137 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 194 Average acquisition mode. If you are unsure how to select Average, see Selecting an Acquisition Mode on page 3–23. 3. Once you have selected a source, select a destination for the template: press Template Destination (side) Ref1, Ref2, Ref3, or Ref4. 3–138 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 195 To view the template you have created, press the MORE button. Then press the button corresponding to the destination reference memory you have used. The waveform appears on the display. 3–139 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 196 Ring Bell if Condition Met (side) to ON. If you want the oscilloscope to stop when waveform data exceeds the limits set, toggle Stop After Limit Test Condition Met (side) to ON. 3–140 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 197 If more than one waveform fails during the same acquisition, the template will track the position of the waveform in the highest numbered channel. For example, CH 2 is higher than CH 1. 3–141 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 198 Single Wfm Math (main). 2. To define the source waveform, press Set Single Source to (side) repeatedly to cycle it to the desired channel or reference waveform. Figure 3–84: More Menu 3–142 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 199 NOTE. If you select *, for multiply, in step 4, the cursor feature will measure amplitude in the units volts squared, VV, rather than in volts, V. Figure 3–85: Dual Waveform Math Main and Side Menus 3–143 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 200 Measuring harmonic content and distortion in systems Characterizing the frequency content of DC power supplies Analyzing vibration Analyzing harmonics in 50 and 60 cycle lines Identifying noise sources in digital logic circuits 3–144 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 201 DSP also allows the phase as well as the magnitude to be displayed. 3–145 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 202 5. If the selected math waveform is not FFT, press Change Math Definition (side) FFT (main). See Figure 3–87. 6. Press Set FFT Source to (side) repeatedly until the channel source selected in step 1 appears in the menu label. 3–146 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 203 Best type for measuring the frequency spectrum of nonrepetitive signals and measuring frequency components near DC. 3–147 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 204 12. Press OK Create Math Wfm (side) to display the FFT of the waveform you input in step 1. (See Figure 3–88.) Figure 3–88: FFT Math Waveform in Math1 3–148 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 205 The cursor units will always be in Hz, regardless of the setting in the Time Units side menu. The first point of the FFT record is the zero frequency point for the @: readout. 3–149 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 206 FFT math waveform that you display.) Continue reading the topics that follow to learn how to optimize the oscilloscope setup for good display of your FFT waveforms. 3–150 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 207 Waveform Record 10 K Zero Phase Reference FFT Time Domain Record = 10k Waveform Record > 10 K Zero Phase Reference Figure 3–90: Waveform Record vs. FFT Time Domain Record 3–151 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 208 20 Megasamples per second would yield an FFT with a range of 0 to 10 MHz. The sample rates available for acquiring data records vary over a range. TDS oscilloscopes display the sample rate in the acquisition readout at the top of the oscilloscope screen. 3–152 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 209 FFT on the saved waveform. That way the DSP will compute the FFT based on saved, static data and will only update if you save a new waveform. 3–153 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 210 FFT math waveforms of 500 point waveforms are always zoomed 2X or more with interpolation. Waveforms with other record lengths can be zoomed or not and can have minimum Zooms of 1X or less. 3–154 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 211 Since you increase the Nyquist frequency as you increase the sample rate, the alias signals should appear at their proper frequency. 3–155 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 212 FFT time domain waveform: Set the trigger position to 50% and horizontal position to 50% for all record lengths less than 15 K. 3–156 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 213 5. Press Suppress Phase at Amplitudes (side). Use the general purpose knob to set phase suppression to the value obtained using the H Bar cursor. Do not change the window selection or you will invalidate the results obtained using the cursor. 3–157 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 214 In general, then, choose a window that can just resolve between the frequencies you want to measure. That way, you will have the best amplitude accuracy and leakage elimination while still separating the frequencies. 3–158 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 215 Depending on the distance of the frequencies you are trying to measure from the fundamental, the Hamming window sometimes resolves frequencies better than the Hanning. 3–159 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 216 The Hanning and Blackman/ Harris windows taper the data at the end of the record to zero; therefore, they are generally better choices to eliminate leakage. 3–160 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 217 This capability allows you to display a derivative math waveform that indicates the instantaneous rate of change of the waveform acquired. This section describes how to setup the oscilloscope to display and measure derivative math waveforms. 3–161 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 218 1. You should now have your derivative math waveform on screen. Use the Vertical SCALE and POSITION knobs to size and position your waveform as you require. 3–162 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 219 3–163 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 220 If your math waveform is a narrow differentiated pulse, it may not appear to be clipped when viewed on screen. You can detect if your derivative math wave- form is clipped by expanding it horizontally using Zoom so you can see the 3–164 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 221 Integral waveforms find use in the following applications: Measuring of power and energy, such as in switching power supplies Characterizing mechanical transducers, as when integrating the output of an accelerometer to obtain velocity 3–165 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 222 You should now have your integral math waveform on screen. See Fig- ure 3–97. Use the Vertical SCALE and POSITION knobs to size and position your waveform as you require. 3–166 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 223 6. Read the integrated voltage over time between the cursors in volt-seconds from the : readout. Read the integrated voltage over time between the selected cursor and the reference indicator of the math waveform from the @: readout. (See Figure 3–98.) 3–167 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 224 : readout. Read the integrated voltage over time between the X of the selected cursor and the reference indicator of the math waveform from the @: readout. 3–168 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 225 (Press MORE, then select the integrated waveform in the More main menu. Then use the Vertical and Horizontal SCALE knobs to adjust the math waveform size.) 3–169 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 226 On (side). The vertical and horizontal zoom factors appear on screen. Whether Zoom is on or off, you can press Reset Zoom Factors (side) to return the zoomed integral waveform to no magnification. 3–170 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 227 Appendices...
  • Page 228 It allow investigation of a range of NTSC, PAL, SECAM, and high definition TV signals. Scope cart K420 scope cart. This cart can help transport the oscilloscope around many lab environments. A–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 229 Add four 1 GHz P6245 active probes Color printer Tektronix Phaser 200e, 300 dpi, thermal transfer, color printer. It handles letter or A4 size Tektronix thermal paper and transparencies. It can handle laser copy (plain) paper with the ColorCoat Transfer roll.
  • Page 230: Table A-2: Standard Accessories

    User Manual 070-8991-xx Programmer Manual 070-8709-xx Reference 070-8999-xx Performance Verification 070-8990-xx TDS 744A: Four P6139A 10X, 500 MHz Passive probes P6139A Front Cover 200-3696-00 Accessory Pouch 016-1268-00 U.S. Power Cord 161-0230-01 A–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 231: Table A-1: Options

    50 input. Use with 1103 TekProbe Power Supply for offset control. P6563AS Passive, SMD probe, 20X, 500 MHz P6046 Active, differential probe, 1X/10X, DC to 100 MHz, 50 input. A–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 232: Table A-4: Accessory Software

    Service Assurance Tektronix offers the following services that you can purchase any time during the warranty period of this product: REPXXXX provides one year of post-warranty repair support. It is available in one year increments up to three years.
  • Page 233 Appendix A: Options and Accessories CALXXXX provides one year of calibration support. It is available in one year increments up to five years. A–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 234 Histogram Method — attempts to find the highest density of points above and below the waveform midpoint. It attempts to ignore ringing and spikes when determining the 0% and 100% levels. This method works well when measuring square waves and pulse waveforms. B–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 235 Mid2Ref — the middle reference level for a second waveform (or the second middle reference of the same waveform). Used in delay time calculations. Typically set to 50%. You can set it from 0% to 100% or to a voltage level. B–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 236 (or the gated region) of the opposite polarity of . This is 3. Continuing from , find the next in the waveform record (or the gated region) of the same polarity as . This is B–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 237 Values range between 0.0 and 1.0 samples. This value is determined by the instrument when it receives a trigger. The actual zero reference (trigger) location in the measurement record is at B–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 238 This is 2. Find the last (begin the search at and search toward ). This is . This could be a different value from 3. Compute – B–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 239 Figure B–2 shows a falling edge with the two crossings necessary to calculate a Fall measurement. 1. Searching from , find the first sample in the measurement zone greater than B–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 240 1 Hz = 1 cycle per second. = 0 or is otherwise bad, return an error. = 1/ High 100% (highest) voltage reference value. (See High, Low on page B–1.) Using the min-max measurement technique: B–7 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 241 Timing measurement. The ratio of the negative pulse width to the signal period expressed as a percentage. is defined in Negative Width, below. = 0 or undefined then return an error. Negative Overshoot Amplitude (voltage) measurement. B–8 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 242 3. The first in the reference waveform crossing in the same direction (polarity) as that found for the target waveform is found. 4. The phase is determined by the following: B–9 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 243 Figure B–3 shows a rising edge with the two crossings necessary to calculate a Rise Time measurement. 1. Searching from , find the first sample in the measurement zone less than B–10 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 244 LowRef Figure B–3: Rise Time RMS: Amplitude (voltage) measurement. The true Root Mean Square voltage. then = the (interpolated) value at Otherwise, For details of the integration algorithm, see below. B–11 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 245 (but not both), determined in the following manner: 1. Step through the waveform from until the sample min and max pair DO NOT straddle 2. If the pair > , use the minima, else use maxima. B–12 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 246 MidRef, so use minima. Both min and max samples are below MidRef, so use maxima. MidRef Figure B–4: Choosing Minima or Maxima to Use for Envelope Measurements B–13 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 247 NOT available. However, if you question the validity of any measurement in the snapshot display, you can select and display the measurement individually and then check for a warning message. B–14 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 248 170 kg (375 pound) test strength. 2. If you are shipping the oscilloscope to a Tektronix field office for repair, attach a tag to the oscilloscope showing the instrument owner and address, the name of the person to contact about the instrument, the instrument type, and the serial number.
  • Page 249 Appendix C: Packaging for Shipment C–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 250: Table D-1: Factory Initialization Defaults

    Delay trigger envelope # Delay events, triggerable after main Delay time 16 ns Delayed, delay by ... Delay by Time Delayed, time base mode Delayed Runs After Main Display clock No Change D–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 251 Horizontal – FastFrame (TDS 700A models only) Horizontal – FastFrame, frame count (TDS 700A models only) Horizontal – FastFrame, frame length (TDS 700A models only) Horizontal – fit to screen D–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 252 Factory Init) Clock Edge = Rising Logic trigger threshold (all channels) 1.4 V (clipped to 1.2 V at the default (pattern, state, and Setup/Hold) volts/division setting) D–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 253 0.8 V Pulse runt trigger polarity Positive Pulse runt width 2.0 ns Pulse runt triggers when ... Occurs Pulse slew rate Delta Time 2.0 ns Pulse slew rate polarity Positive D–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 254 Minimum Available Dual Window Zoom, Selected Graticule Upper (TDS 700A models only) Zoom vertical (all channels) 1.0X (TDS 684A); 2.0X (TDS 700A models) Zoom vertical position (all channels) 0 divisions D–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 255 Appendix D: Factory Initialization Settings D–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 256 Tektronix recommends you order the P6245 active probe to take advantage of the 1 GHz bandwidth of these two oscilloscopes. NOTE. The TDS 744A comes with four P6139A passive probes. The TDS 684A and TDS 784A Oscilloscopes come without probes, but for general purpose measurements and to take advantage of the wide bandwidth of these two oscilloscopes, the P6245 Active Probe is recommended.
  • Page 257 1 kV to 20 kV (DC + peak AC), the probe head design is mechanically much larger than for a passive probe. High voltage probes have the added advantage of lower input capacitance (typically 2-3 pF). Figure E–1: Typical High Voltage Probes E–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 258 In some small-geometry or dense circuitry applications, such as surface mounted devices (SMD), a hand-held probe is too big to be practical. You can instead use fixtured (or probe card mounted) active probes (or buffered amplifiers) to E–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 259 Current Probes Current probes enable you to directly observe and measure current waveforms, which can be very different from voltage signals. Tektronix current probes are unique in that they can measure from DC to 1 GHz. Two types of current probes are available: one that measures AC current only and AC/DC probes that utilize the Hall effect to accurately measure the AC and DC components of a signal.
  • Page 260 The TVC adds three measurement functions to the voltage versus time capability of your oscilloscope: time delay versus time, pulse-width versus time, and period versus time. E–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 261 Appendix E: Probe Selection E–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 262 Glossary...
  • Page 263 Area Measurement of the waveform area taken over the entire waveform or the gated region. Expressed in volt-seconds. Area above ground is positive; area below ground is negative. Glossary–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 264 Paired markers that you can use to make measurements between two waveform locations. The oscilloscope displays the values (expressed in volts or time) of the position of the active cursor and the distance between the two cursors. Glossary–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 265 Although the samples are taken sequentially in time, they are random with respect to the trigger. Glossary–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 266 That average results in a higher-resolution, lower-bandwidth wave- form. That mode only works with real-time, non-interpolated sampling. Glossary–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 267 (that is, channels that are turned off) to sample those that are in use (turned on). Table 3–2 on page 3–19 lists acquisition rates vs. number of channels that are on. Glossary–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 268 Negative duty cycle A timing measurement representing the ratio of the negative pulse width to the signal period, expressed as a percentage. Glossary–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 269 Phase is expressed in degrees, where 360 comprise one complete cycle of one of the waveforms. Waveforms measured should be of the same frequency or one waveform should be a harmonic of the other. Glossary–7 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 270 Real-time sampling A sampling mode where the oscilloscope samples fast enough to completely Glossary–8 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 271 The clock edge may be the rising or falling edge. Select button A button that changes which of the two cursors is active. Glossary–9 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 272 The oscilloscope displays the value of the active (move- able) cursor with respect to the trigger and the time value between the bars. Waveform The shape or form (visible representation) of a signal. Glossary–10 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 273 YT format The conventional oscilloscope display format. It shows the voltage of a waveform record (on the vertical axis) as it varies over time (on the horizontal axis). Glossary–11 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 274 Glossary Glossary–12 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 275 Index...
  • Page 276 How to execute, 3–6–3–48 Sample, 3–23 AUTOSET button, 2–14 Single Acquisition Sequence, 3–26 AUX TRIGGER INPUT, BNC, 2–5 Stop After, 3–25, 3–141 Auxiliary trigger, 3–50 Stop After Limit Test Condition Met, 3–140 Index–1 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 277 VERTICAL MENU, 2–17 Color menu, 3–33 WAVEFORM OFF, 2–18, 3–8, 3–32 Bold, 3–34 ZOOM, 3–37, 3–38 Change Colors, 3–34 Buttons Collision Contrast, 3–36 CH1, CH2 ..., 3–8 Color, 3–34, 3–35, 3–36 Index–2 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 278 On hardcopies, 3–123 Ground, Glossary–4 To set, 3–124 Selecting, 3–12–3–48 DC coupling, Glossary–3 Trigger, 3–52–3–86 DC offset, 3–153 Coupling Waveforms, 3–3 for DC correction of FFTs, 3–153 Coupling, Delayed Trigger menu, 3–85 Index–3 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 279 Differential active probes, E–3 Dual Window Zoom, 3–40 Dual Zoom, Zoom menu, 3–41 Differentiation Dual Zoom Offset, Zoom menu, 3–41 of a derivative, 3–162 waveform, 3–161 Duty cycle, 2–20, Glossary–6, Glossary–8 Index–4 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 280 Glitch trigger, 3–71, Glossary–4 interpolation mode, 3–154 How to set up, 3–72–3–86 magnifying, 3–154 Glitch, Main Trigger menu, 3–73 phase display, setup considerations, 3–156 Goes FALSE, Main Trigger menu, 3–66, 3–68 Index–5 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 281 Fit to screen, 3–15 Format, 3–122 Frame Count, 3–47 GPIB, 3–123 Frame Length%, 3–47 HPGL, 3–122 Frame%, 3–47 Interleaf, 3–122 Horiz Pos, 3–16 Landscape, 3–122 Horiz Scale, 3–15 Laserjet, 3–122 Index–6 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 282 Main Scale, Horizontal menu, 3–15 FFT distortion, 3–155 Main Trigger Menu Incompatible with InstaVu, 3–46 Falling edge, 3–60 linear versus sin(x)/x, 3–155 Rising edge, 3–60 IRE (NTSC), Cursor menu, 3–101 Index–7 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 283 Cycle mean, 3–88, Glossary–3 Slope, 3–60 Cycle RMS, 3–88, Glossary–3 Source, 3–58, 3–73, 3–74, 3–76, 3–77 Delay, 3–94, Glossary–3 State, 3–67, 3–68 Duty cycle, 2–20, Glossary–6, Glossary–8 Thresholds, 3–75, 3–78 Index–8 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 284 3–74, 3–77 Measure, 3–90, 3–95 More, 3–115, 3–142, 3–146, 3–162 NAND, Glossary–6 See also More menu NAND, Main Trigger menu, 3–66, 3–68 Operation, 2–7 Negative duty cycle, 3–89 Pop-up, 2–8, Glossary–8 Index–9 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 285 Paired cursor, 3–97 Compensation Signal, 2–13 PAL, Display menu, 3–31 Connection, 2–9 Palette, Color menu, 3–33 Current, E–4 Palette, Hardcopy menu, 3–123 Definition, Glossary–8 Passive voltage probes, E–1–E–6 Differential active, E–3 Index–10 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 286 Real time sampling, 3–17 RS-232, 2–5 Real-time sampling, Glossary–8 RS-232, Port, 3–123, 3–128 Rear panel, 2–5 RUN/STOP, 3–48 Recall, Setups, 3–111–3–132 RUN/STOP, Acquire menu, 3–26 Recall Factory Setup, Save/Recall Setup menu, 3–113 Index–11 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 287 Snapshot of Measurements, 2–23, 3–95 Set 1st Source to, More menu, 3–143 Snapshot, Measure menu, 3–95 Set 2nd Source to, More menu, 3–143 Software version, 3–133 Set Function to, More menu, 3–143 Index–12 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 288 Type Logic, Main Trigger menu Trigger, 3–49–3–86, Glossary–10 Logic, 3–64, 3–67, 3–68 AC Line Voltage, 3–50 Pulse, 3–77 Auxiliary, 3–50 Type Pulse, Main Trigger menu, 3–72 Coupling, 3–52–3–86 Delay, 3–53 Index–13 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 289 VERTICAL MENU button, 2–17 Hanning, 3–148, 3–158, 3–161 Vertical position, for DC correction of FFTs, 3–153 rectangular, 3–147, 3–158, 3–161 Vertical POSITION knob, 3–10, 3–38 rectangular vs. bell-shaped, 3–160 Vertical Readout, 3–10 Index–14 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 290 Horizontal Lock, 3–39 YT, Display menu, 3–31 Preview, 3–40 Reset Zoom Factors, 3–40 Zoom Off, 3–40 Zoom Off, Zoom menu, 3–40 Zero phase reference point, 3–151, 3–156 establishing for impulse testing, 3–156–3–157 Index–15 TDS 684A, TDS 744A, & TDS 784A User Manual...
  • Page 291 Index Index–16 TDS 684A, TDS 744A, & TDS 784A User Manual...

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