Tektronix TDS 784A - Manuals

TDS 684A, TDS 744A, & TDS 784A User Manual i Table of Contents General Safety Summary ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xiii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Manuals xiii...

Table of Contents ii TDS 684A, TDS 744A, & TDS 784A User Manual Delayed Triggering 3–80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measuring Waveforms 3–87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Taking Automa...

Table of Contents TDS 684A, TDS 744A, & TDS 784A User Manual iii List of Figures Figure 1–1: Rear Panel Controls Used in Start Up 1–4 . . . . . . . . . . . . . . . Figure 1–2: ON/STBY Button 1–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2–1: Connecting a Probe for th...

Table of Contents iv TDS 684A, TDS 744A, & TDS 784A User Manual Figure 3–11: Real-Time Sampling 3–17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3–12: Equivalent-Time Sampling 3–18 . . . . . . . . . . . . . . . . . . . . . . . Figure 3–13: How the Acquisition Modes Work 3–21...

Table of Contents TDS 684A, TDS 744A, & TDS 784A User Manual vii List of Tables Table 1–1: Key Features of the TDS Oscilloscopes 1–1 . . . . . . . . . . . . . . . Table 1–2: Fuse and Fuse Cap Part Numbers 1–5 . . . . . . . . . . . . . . . . . . . Table 3–1: Autoset Defaults 3–6 . . . . . . . . ....

Table of Contents viii TDS 684A, TDS 744A, & TDS 784A User Manual

TDS 684A, TDS 744A, & TDS 784A User Manual ix General Safety Summary Review the following safety precautions to avoid injury and prevent damage tothis product or any products connected to it. Only qualified personnel should perform service procedures. Injury Precautions To avoid fire hazard, use...

General Safety Summary x TDS 684A, TDS 744A, & TDS 784A User Manual To prevent product overheating, provide proper ventilation. If you suspect there is damage to this product, have it inspected by qualifiedservice personnel. Clean the probe using only a damp cloth. Refer to cleaning instructions...

General Safety Summary TDS 684A, TDS 744A, & TDS 784A User Manual xi The following symbols may appear on the product: DANGER High Voltage Protective Ground (Earth) Terminal ATTENTION Refer to Manual Double Insulated Certifications and Compliances CSA Certification includes the products and power...

General Safety Summary xii TDS 684A, TDS 744A, & TDS 784A User Manual

TDS 684A, TDS 744A, & TDS 784A User Manual xiii Preface This is the User Manual for the TDS 684A, TDS 744A, and TDS 784ADigitizing Oscilloscopes. The chapter Getting Started briefly describes the TDS Oscilloscope, preparesyou to install it, and tells you how to put it into service. The chapter O...

Preface xiv TDS 684A, TDS 744A, & TDS 784A User Manual Conventions In this manual, you will find various procedures which contain steps ofinstructions for you to perform. To keep those instructions clear and consistent,this manual uses the following conventions: In procedures, names of front pan...

TDS 684A, TDS 744A, & TDS 784A User Manual 1–1 Product Description The Tektronix TDS Oscilloscope is a superb tool for acquiring, displaying, andmeasuring waveforms. Its performance addresses the needs of both benchtop laband portable applications with the following features: Table 1–1: Key Feat...

Product Description 1–2 TDS 684A, TDS 744A, & TDS 784A User Manual Table 1–1: Key Features of the TDS Oscilloscopes (Cont.) Feature TDS 784A TDS 744A TDS 684A Trigger modes Include: edge, logic, and pulse. Video trigger, with option 05, modesinclude:NTSC, SECAM, PAL, HDTV, and FlexFormat . Stora...

TDS 684A, TDS 744A, & TDS 784A User Manual 1–3 Start Up Before you use the TDS Oscilloscope, ensure that it is properly installed andpowered on. Preparation To ensure maximum accuracy for your most critical measurements, you shouldknow about signal path compensation and the proper use of the pro...

Start Up 1–4 TDS 684A, TDS 744A, & TDS 784A User Manual Putting into Service To learn how to install, access the front panel, power on, do a self test, andpower off the oscilloscope, do the following procedures: To properly install and power on the oscilloscope, do the following steps: 1. Be sur...

Start Up TDS 684A, TDS 744A, & TDS 784A User Manual 1–5 Table 1–2: Fuse and Fuse Cap Part Numbers Fuse Fuse Part Number Fuse CapPart Number 0.25 inch × 1.25 inch (UL 198.6, 3AG): 6 A FAST, 250 V. 159-0013-00 200-2264-00 5 mm × 20 mm (IEC 127): 5 A (T), 250 V. 159-0210-00 200-2265-00 To remove th...

Start Up 1–6 TDS 684A, TDS 744A, & TDS 784A User Manual The ON/STBY button controls power to most of the instrument circuits. Powercontinues to go to certain parts even when this switch is set to STBY. Once the oscilloscope is installed, it is typical to leave the principal powerswitch on and us...

TDS 684A, TDS 744A, & TDS 784A User Manual 2–1 Overview This chapter describes the basic concepts of operating the TDS Oscilloscope.Understanding the basic concepts of your oscilloscope will help you use it muchmore effectively. The first section, Operating Interface Maps, quickly shows you how ...

TDS 684A, TDS 744A, & TDS 784A User Manual 2–3 Operating Interface Maps This section contains illustrations, or maps, of the display, the front and rearpanels, and the menu system of the TDS Oscilloscope. These maps will help youunderstand and operate the oscilloscope. This section also contains...

Operating Interface Maps 2–4 TDS 684A, TDS 744A, & TDS 784A User Manual Front Panel Map — Right Side Hardcopy, page 3–120 File System, page 3–117 Autoset, page 3–5 Help, page 3–135 Status, page 3–133 Selecting Channels, page 3–7 Horizontal Controls, page 3–13 Acquisition Modes, page 3–20 Cursor ...

Operating Interface Maps TDS 684A, TDS 744A, & TDS 784A User Manual 2–5 Rear Panel Map Rear Panel Connectors Security Bracket GPIB Connector, page 3–128 Centronics Connector Principal Power Switch, page 1–5 Serial Number SIGNAL OUTPUT – (Provides Analog Signal Output) AUX TRIGGER INPUT – (Provid...

Operating Interface Maps 2–6 TDS 684A, TDS 744A, & TDS 784A User Manual Display Map The value entered with the general purpose knob or keypad. Channel level and waveform source. The main menu with choices of major actions The side menuwith choices ofspecific actions. Vertical scale, page 3–10 Ho...

Operating Interface Maps TDS 684A, TDS 744A, & TDS 784A User Manual 2–7 To Operate a Menu 1 Press front-panel menu button. (Press SHIFT first if button label is blue.) 2 Press one of these buttons to select from main menu. 3 Press one of these buttons to select from side menu (if displayed). 4 I...

Operating Interface Maps 2–8 TDS 684A, TDS 744A, & TDS 784A User Manual To Operate a Pop-Up Menu Press to display pop-up menus. Press it again to make selection. Alternatively, press SHIFT first to make selection in the opposite direction. A pop-up selection changes the other main menu titles. P...

TDS 684A, TDS 744A, & TDS 784A User Manual 2–9 Tutorial This section quickly makes you acquainted with some of the fundamentaloperations required to use the TDS Oscilloscope to take measurements. Start thistutorial by doing Setting Up for the Examples on this page. Setting Up for the Examples Pe...

Tutorial 2–10 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . See Appendix A: Options and Accessories for optional probes you can order and use with this product. Do the following steps to reset the oscilloscope to a known factory default statebefore doing the examples. (You can reset the osci...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–11 The display shows side menus along the right side of the screen. The buttonsto select these side menu items are to the right of the side menu. Because an accidental instrument reset could destroy a setup that took a longtime to create, the...

Tutorial 2–12 TDS 684A, TDS 744A, & TDS 784A User Manual The channel reference indicator shows the vertical position of channel 1with no input signal. This indicator points to the ground level for the channelwhen its vertical offset is set to 0 V in the vertical menu; when vertical offsetis not ...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–13 Example 1: Displaying a Waveform The TDS Oscilloscope provides front panel knobs for you to adjust a waveform,or it can automatically set up its controls to display a waveform. Do the followingtasks to learn how to adjust a waveform and ho...

Tutorial 2–14 TDS 684A, TDS 744A, & TDS 784A User Manual When you first connect a signal to a channel and display it, the signal displayedmay not be scaled and triggered correctly. Use the autoset function and youshould quickly get a meaningful display. You should have a stable display of the pr...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–15 Figure 2–9 shows the display after pressing AUTOSET. If necessary, you canadjust the waveform now by using the knobs discussed earlier in this example. Figure 2–9: The Display After Pressing Autoset NOTE . If you are using a passive probe,...

Tutorial 2–16 TDS 684A, TDS 744A, & TDS 784A User Manual The VERTICAL section of the front panel contains the channel selectionbuttons. These buttons are CH 1, CH 2, CH 3, CH 4, and MORE. (See Fig-ure 2–11.) Figure 2–11: The Channel Buttons and Lights Each of the channel (CH) buttons has a light...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–17 The light above the CH 2 button is now on, and the CH 1 light is off.Because the knobs control only one channel at a time, the verticalcontrols are now set to adjust channel 2. The trigger readout still indicates that the trigger is detect...

Tutorial 2–18 TDS 684A, TDS 744A, & TDS 784A User Manual 7. Press (side) to toggle the selection to 50 . That changes the input coupling of channel 2 from 1 M W to 50 W . The channel readout for channel 2 (near the bottom of the graticule) now shows an W indicator. Pressing a channel (CH) button...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–19 Since the CH 2 light was on when you pressed the WAVEFORM OFFbutton, the channel 2 waveform was removed. The channel (CH) lights now indicate channel 1. Channel 1 has become theselected channel. When you remove the last waveform, all the C...

Tutorial 2–20 TDS 684A, TDS 744A, & TDS 784A User Manual measurement on another channel, select that channel, and then select themeasurement.) Figure 2–14: Measure Main Menu and Select Measurement Side Menu 7. Press Positive Width (side) ➞ –more– (side) ➞ Rise Time (side) ➞ Positive Duty Cycle (...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–21 Press to Remove Menus From Screen Figure 2–15: Four Simultaneous Measurement Readouts By default, the measurement system will use the 10% and 90% levels of thewaveform for taking the rise time measurement. You can change these values tooth...

Tutorial 2–22 TDS 684A, TDS 744A, & TDS 784A User Manual Hint: To make large changes quickly with the general purpose knob, press theSHIFT button before turning the knob. When the light above the SHIFT buttonis on and the display says Coarse Knobs in the upper-right corner, the generalpurpose kn...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–23 You have seen how to display up to four individual automated measurements onscreen. You can also pop up a display of almost all of the automated measure-ments available in the Select Measrmnts side menus. This snapshot of measure-ments is ...

Tutorial 2–24 TDS 684A, TDS 744A, & TDS 784A User Manual 3. Press Remove Measrmnt (main) to remove the snapshot display. (You can also press CLEAR MENU, but a new snapshot will be executed the nexttime you display the Measure menu.) Example 4: Saving Setups The TDS Oscilloscope can save its cont...

Tutorial TDS 684A, TDS 744A, & TDS 784A User Manual 2–25 Figure 2–18: Save/Recall Setup Menu 7. Press one of the To Setup side menu buttons to store the current instrument settings into that setup location. Remember which setup location youselected for use later. There are more setup locations t...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–1 Overview This chapter describes in detail how to perform the operating tasks you must doto measure, test, process, or save and document your waveforms. It leads withthree sections on the fundamental tasks of acquiring, stably displaying, andtaking m...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–3 Acquiring and Displaying Waveforms To use the TDS Oscilloscope to measure or monitor waveforms, you need toknow how to acquire, select, and display those waveforms properly. To help youdo so, this section describes how to do the following tasks: How...

Acquiring and Displaying Waveforms 3–4 TDS 684A, TDS 744A, & TDS 784A User Manual Probe Compensated Correctly Probe Overcompensated Probe Undercompensated Figure 3–1: How Probe Compensation Affects Signals 4. If you need to change the input impedance, press Coupling (main). Then toggle the side ...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–5 To ensure proper coupling of your input signals to the oscilloscope, consider thefollowing points when you use 50 W coupling with any channel: The oscilloscope does not accurately display frequencies under 200 kHz ...

Acquiring and Displaying Waveforms 3–6 TDS 684A, TDS 744A, & TDS 784A User Manual Do the following steps to automatically set up the oscilloscope: 1. Press the channel selection button (such as CH 1) corresponding to your input channel to make it active. 2. Press AUTOSET. If you use Autoset when...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–7 Table 3–1: Autoset Defaults (Cont.) Control Changed by Autoset to Trigger Position Unchanged Trigger Type Edge Trigger Source Numerically lowest of the displayed channels (the selectedchannel) Trigger Level Midpoin...

Acquiring and Displaying Waveforms 3–8 TDS 684A, TDS 744A, & TDS 784A User Manual To determine which channel is currently selected, check the channel readout. Itshows the selected channel in inverse video in the lower left corner of thedisplay. The channel reference indicator for the selected ch...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–9 3. To select a math waveform you have created or a reference waveform you have stored, press MORE and select the waveform from the More menu.Press WAVEFORM OFF while the MORE button is lit to remove thedisplay of t...

Acquiring and Displaying Waveforms 3–10 TDS 684A, TDS 744A, & TDS 784A User Manual The Channel Reference icon, at the left side of the display, points to ground onthe waveform record when offset is set to 0 V. The oscilloscope contracts orexpands the selected waveform around this point when you ...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–11 As you turn the vertical SCALE knob clockwise, the value decreasesresulting in higher resolution because you see a smaller part of the wave-form. As you turn it counterclockwise the scale increases allowing you to...

Acquiring and Displaying Waveforms 3–12 TDS 684A, TDS 744A, & TDS 784A User Manual To select the coupling, bandwidth, and offset for the selected waveform, use theVertical menu (Figure 3–6). This menu also lets you numerically change theposition or scale instead of using the vertical knobs. To m...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–13 Offset. Use offset to subtract DC bias before examining a waveform. For example, you might want to display a small ripple (for example, 100 mV of ripple) on apower supply output (for example, a +15 V output). Adju...

Acquiring and Displaying Waveforms 3–14 TDS 684A, TDS 744A, & TDS 784A User Manual To change the horizontal scale and position: 1. Turn the horizontal POSITION and horizontal SCALE knobs. (See Figure 3–8.) 2. If you want the POSITION knob to move faster, press the SHIFT button. When the light ab...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–15 posttrigger portion. All timing measurements in the waveform record are maderelative to the trigger event. To define the trigger point position: Press HORIZONTAL MENU ➞ Trigger Position (main) ➞ Set to 10%, Set to...

Acquiring and Displaying Waveforms 3–16 TDS 684A, TDS 744A, & TDS 784A User Manual Horizontal Position. To set the horizontal position to specific values in the menu instead of using the Horizontal POSITION knob: Press HORIZONTAL MENU ➞ Horiz Pos (main) ➞ Set to 10%, Set to 50%, or Set to 90% (s...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–17 Input Signal Sampled Points Digital Values +5.0 V –5.0 V +5.0 V –5.0 V 0 V 0 V 0 V 0 V Figure 3–9: Acquisition: Input Analog Signal, Sample, and Digitize The oscilloscope uses the samples it takes (see Figure 3–11...

Acquiring and Displaying Waveforms 3–18 TDS 684A, TDS 744A, & TDS 784A User Manual 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-timemaximum sampling rate, but only under two conditions: You must hav...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–19 Eventually the time period established by scale setting does not allow enoughtime to get all the real samples needed to fill the record. The situation just described occurs if you set the Horizontal SCALE knob to ...

Acquiring and Displaying Waveforms 3–20 TDS 684A, TDS 744A, & TDS 784A User Manual Once you set horizontal scale to exceed the maximum digitizing rate for thenumber of channels in use (see Table 3–2), the oscilloscope will not be able toget enough samples to create a waveform record. At that poi...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–21 Waveform Drawn on CRT Samples Acquired in Four Acquisition Intervals Displayed Record Points Acquisition Mode Use for fastest acquisition rate. This is the default mode. Use to reduce apparent noise. Provides the ...

Acquiring and Displaying Waveforms 3–22 TDS 684A, TDS 744A, & TDS 784A User Manual Peak Detect Mode. TDS 700A models only: Peak Detect mode alternates between saving the highest sample in one acquisition interval and lowest sample in thenext acquisition interval. Peak Detect mode only works with...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–23 To determine the acquisition sampling rate, the acquisition state (running orstopped), and the acquisition mode, check the Acquisition readout at the top ofthe display. (See Figure 3–14.) The state “Run:” shows th...

Acquiring and Displaying Waveforms 3–24 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . TDS 700A models only: Selecting Hi Res mode in the Acquire menu will automatically reduce the record length to a value that prevents overflow ofacquisition memory. Because Hi Res mode uses twice the acquisi...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–25 Table 3–5: TDS 784A Sampling Mode Selection (When Fit to Screen is Off) Time Base 1 One Channel Two Channels Three or Four Channels u 25 ns Real-time Real-time Real-time 25 ns Real-time Real-time Equiv.-time or in...

Acquiring and Displaying Waveforms 3–26 TDS 684A, TDS 744A, & TDS 784A User Manual Press RUN/STOP button only (side) to use the RUN/STOP button to startor stop acquiring. Pressing the RUN/STOP button once will stop theacquisitions. The upper left hand corner in the display will say “Stop” andsho...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–27 Actual High-Frequency Waveform Apparent Low-frequency Waveform Due to Aliasing Sampled Points Figure 3–16: Aliasing Methods to Check and Eliminate. To quickly check for aliasing, slowly increase the horizontal sca...

Acquiring and Displaying Waveforms 3–28 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . TDS 700A models only: This subsection assumes you are using Normal acquisitions mode and gives display settings for this mode. If you select InstaVuacquisitions, procedures for making Style, Format, and Rea...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–29 NOTE . TDS 700A models only: See Using InstaVu T Acquisition Mode, on page 3–43, for differences in how Style setup differs for InstaVu mode. Figure 3–17: Display Menu — Style Intensity lets you set text/graticule...

Acquiring and Displaying Waveforms 3–30 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Toggle Display ‘T’ @ Trigger Point (side) to select whether or not to display ‘T’ indicating the trigger point. You can select ON or OFF. (Thetrigger point indicates the position of the trigger in the waveform ...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–31 The display filter types are sin(x)/x interpolation and linear interpolation. Toswitch between interpolation filters: Press DISPLAY ➞ Filter (main) ➞ Sin(x)/x Interpolation or Linear Interpo- lation (side). NOTE ....

Acquiring and Displaying Waveforms 3–32 TDS 684A, TDS 744A, & TDS 784A User Manual YT is the conventional oscilloscope display format. It shows a signal voltage (thevertical axis) as it varies over time (the horizontal axis). XY format compares the voltage levels of two waveform records point by...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–33 Customizing the Display Color The TDS Oscilloscope can display information in different colors. Thissubsection describes how to use the Color menu to choose the colors in whichthe various display objects appear. T...

Acquiring and Displaying Waveforms 3–34 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Select one of the available palettes in the side menu. Choose from Normal, Bold, Hardcopy Preview or Monochrome. 3. If you are using a persistence display and want to vary the color of each point depending on i...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–35 6. Choose Saturation from the side menu and use the general purpose knob or keypad to select the saturation you desire. A value of 100 provides a purecolor. A value of 0 provides gray. ScrTxt Figure 3–20: Display ...

Acquiring and Displaying Waveforms 3–36 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Select one of the four reference waveforms by pressing Ref in the side menu. 3. To assign the selected reference waveform to a specific color, press (repeatedly) Color and choose the value. 4. To make the selec...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–37 Figure 3–22: Display Menu — Restore Colors Zooming on Waveforms The TDS Oscilloscope can expand or compress (zoom in or out) on a waveformwithout changing the acquisition parameters (sample rate, record length, an...

Acquiring and Displaying Waveforms 3–38 TDS 684A, TDS 744A, & TDS 784A User Manual When zooming horizontally or vertically, Zoom expands or contracts thewaveform by the zoom factor in 1X, 2X, and 5X steps. To help you use Zoom effectively, consider how it is affected by interpolation.When you zo...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–39 5. Adjust the horizontal zoom factor using the horizontal SCALE knob. Adjust the horizontal position of the zoomed waveform using the horizontalPOSITION knob. Depending on the selection for Horizontal Lock in the ...

Acquiring and Displaying Waveforms 3–40 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . Although Zoom must be turned on to control which waveforms Zoom affects, the setting for Horizontal Lock affects which waveforms the horizontalcontrol positions whether Zoom is on or off. The rules for the ...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–41 In Dual Window Zoom mode, the oscilloscope does not display the zoommagnification factors; however, it does display the scale factors (volts/divi-sion and time/division) for the zoomed waveform. Zoomed (Magnified)...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–43 Using InstaVu Acquisition Mode (TDS 700A Models Only) The TDS 744A and TDS 784A Oscilloscopes can use InstaVu acquisition modeto reduce the dead time between waveform updates that normally occur whendigitizing sto...

Acquiring and Displaying Waveforms 3–44 TDS 684A, TDS 744A, & TDS 784A User Manual Next Acquired Waveform Record Next Acquired Waveform Record 1st Set of Acquired Waveform Records Next Set of Acquired Waveform Records Next Set of Acquired Waveform Records Display Updated Display Updated Display ...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–45 Figure 3–27: InstaVu Display To change the InstaVu display style, do the following steps: 1. Press DISPLAY ➞ Mode (main) ➞ InstaVu (pop-up) ➞ Style (main). 2. Select between Vectors and Dots in the side menu. (Dot...

Acquiring and Displaying Waveforms 3–46 TDS 684A, TDS 744A, & TDS 784A User Manual H Envelope, Average, Hi Res, and Single Acquisition Sequence acquisitionmodes and Autosave mode H Delayed time base H Record lengths longer than 500 samples H Interpolation (equivalent time sampling is used instea...

Acquiring and Displaying Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–47 If you are using the FastFrame mode, you can jump to the desired frame. To useFastFrame, do the following steps: 1. Press HORIZONTAL MENU ➞ FastFrame Setup (main) ➞ FastFrame (side) to toggle on or off the use of ...

Acquiring and Displaying Waveforms 3–48 TDS 684A, TDS 744A, & TDS 784A User Manual FastFrame Operating Characteristics. Consider the following operating character- istics when using FastFrame: Envelope, Average, and Hi Res form the envelope or average following thelast frame of the concatenated ...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–49 Triggering on Waveforms To use the TDS Oscilloscope to measure or monitor waveforms, you need toknow how to trigger a stable display of those waveforms. Toward that end, thissection first covers the following topics: Trigger Concepts which details ...

Triggering on Waveforms 3–50 TDS 684A, TDS 744A, & TDS 784A User Manual The trigger event establishes the time-zero point in the waveform record. Allpoints in the record are located in time with respect to that point. The oscillo-scope continuously acquires and retains enough sample points to fi...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–51 in another trigger source. Logic triggers are available on the main trigger systemonly. Video (available as option 05) is a special trigger used on video circuits. It helpsyou investigate events that occur when a video signa...

Triggering on Waveforms 3–52 TDS 684A, TDS 744A, & TDS 784A User Manual Not all of these will result in the same display. The holdoff period allows theoscilloscope to trigger on the correct edge, resulting in a stable display. Holdoff Holdoff Indicates Trigger Points Trigger Level Holdoff Acquis...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–53 Displaying pretrigger information can be valuable when troubleshooting. Forexample, if you are trying to find the cause of an unwanted glitch in your testcircuit, it might trigger on the glitch and make the pretrigger period...

Triggering on Waveforms 3–54 TDS 684A, TDS 744A, & TDS 784A User Manual Trigger Status Lights Figure 3–33: TRIGGER Controls and Status Lights To manually change the trigger level when edge triggering (or certain thresholdlevels when logic or pulse triggering), turn the MAIN LEVEL knob. It adjust...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–55 To trigger on the next valid trigger event and then stop, press SHIFT FORCETRIG. Now press the RUN/STOP button each time you want to initiate thesingle sequence of acquisitions. To leave Single Trig mode, press SHIFT ACQUIRE...

Triggering on Waveforms 3–56 TDS 684A, TDS 744A, & TDS 784A User Manual Main Time Base Main Time Base Time/Div Main Trigger Source = Ch 1 Main Trigger Slope = Rising Edge Main TriggerLevel Figure 3–34: Example Trigger Readouts — Edge Trigger Selected Record View. To determine where the trigger p...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–57 Both the trigger point indicator and level bar are displayed from the Displaymenu. See Set Display Readout Options on page 3–29 for more information. The trigger point indicator shows position. It can be positioned horizonta...

Triggering on Waveforms 3–58 TDS 684A, TDS 744A, & TDS 784A User Manual Use the edge trigger menu to select edge triggering and to perform the proce-dures for source, coupling, slope, trigger level, mode, and holdoff that follow. To bring up the Edge Trigger menu, press TRIGGER MENU ➞ Type (main...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–59 LF Rej removes the low frequency portion of the triggering signal. Lowfrequency rejection attenuates signals below 80 kHz. Noise Rej provides lower sensitivity. Noise Rej requires additional signalamplitude for stable trigge...

Triggering on Waveforms 3–60 TDS 684A, TDS 744A, & TDS 784A User Manual 3. To change to the factory default holdoff setting for the current horizontal scale setting, press Default Holdoff (side). NOTE . If you select Default Holdoff, the default holdoff time will vary with the horizontal scale s...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–61 setup and hold times relative to a clock. This subsection describes how to usethese three classes of logic triggering: pattern, state, and setup/hold. A pattern trigger occurs when the logic inputs to the logic function you ...

Triggering on Waveforms 3–62 TDS 684A, TDS 744A, & TDS 784A User Manual For state triggering, the oscilloscope waits until the end of trigger holdoff andthen waits until the edge of channel 4 transitions in the specified direction. Atthat point, the oscilloscope samples the inputs from the other...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–63 does not become stable long enough before the clock (setup time violation) orthat does not stay stable long enough after the clock (hold time violation). Clock Signal Clock Level T S = Setup Time T H = Hold Time Setup/Hold V...

Triggering on Waveforms 3–64 TDS 684A, TDS 744A, & TDS 784A User Manual of Figure 3–38.) The oscilloscope can then detect and trigger on violations of atime range that occurs before or one that occurs after the clock. NOTE . Keep hold time to at least 2 ns less than the clock period or the oscil...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–65 Figure 3–40: Logic Trigger Menu To Define Pattern 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) ➞ Pattern (pop-up) ➞ Define...

Triggering on Waveforms 3–66 TDS 684A, TDS 744A, & TDS 784A User Manual To Define the Logic. To choose the logic function you want applied to the input channels (see page 3–61 for definitions of the logic functions for both patternand state triggers): Press TRIGGER MENU ➞ Type (main) ➞ Logic (po...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–67 It compares the times and, if the time TRUE is longer (for TRUE for morethan) or shorter (for TRUE for less than), then it triggers a waveform displayat the point the logic condition became FALSE. This time can be, and usual...

Triggering on Waveforms 3–68 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Choose either High (H), Low (L), or Don’t Care (X) (side) for the first three channels. The choices for Ch4 are rising edge and falling edge. Set Thresholds. To set the logic threshold for each channel: 1. Press TRIGGER M...

Triggering on Waveforms 3–70 TDS 684A, TDS 744A, & TDS 784A User Manual Positive setup time always leads the clock edge; positive hold time alwaysfollows the clocking edge. Setup time always leads the hold time by at least 2 ns(T S + T H ≥ 2 ns). Attempting to set either time to reduce the 2 ns ...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–71 subsection describes how to use each of the four classes of pulse triggers: glitch,runt, width, and slew rate triggering. A glitch trigger occurs when the trigger source detects a pulse narrower (orwider) in width than some ...

Triggering on Waveforms 3–72 TDS 684A, TDS 744A, & TDS 784A User Manual Table 3–8: Pulse Trigger Definitions (Cont.) Name Definition Runt positive Triggering occurs if the oscilloscope detects a positive pulsethat crosses one threshold going positive but fails to cross asecond threshold before r...

Triggering on Waveforms 3–74 TDS 684A, TDS 744A, & TDS 784A User Manual If you choose Accept Glitch, the oscilloscope will trigger only on pulsesnarrower than the width you specified. If you select Reject Glitch, it will triggeronly on pulses wider than the specified width. Set the Level. To set...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–75 Negative looks for negative-going runt pulses. Either looks for both positive and negative runt pulses. Set to Trig When. To determine how wide a runt pulse the oscilloscope will trigger on: 1. Press TRIGGER MENU ➞ Type (mai...

Triggering on Waveforms 3–76 TDS 684A, TDS 744A, & TDS 784A User Manual Hint: To use the Trigger Bar feature to set the threshold levels on the pulsetrain, press DISPLAY ➞ Readout Options (main) ➞ Trigger Bar Style (side) until Long appears in that menu item. Note the position of the trigger ind...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–77 Set to Trig When. To set the range of widths (in units of time) the trigger source will search for and to specify whether to trigger on pulses that are outside thisrange or within this range, do the following steps: 1. Press...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–79 whether to trigger on edges with slew rates faster than or slower than thatindicated in readout, do the following step: Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞ Class (main) ➞ Slew Rate (pop-up) ➞ Trigger When (ma...

Triggering on Waveforms 3–80 TDS 684A, TDS 744A, & TDS 784A User Manual To understand what happens when you slew rate trigger, study Figure 3–46 asyou consider the following points: The main menu shows the oscilloscope is set to trigger based on the slewrate of a pulse input to the trigger sourc...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–81 edge trigger and certain classes of main pulse triggers. This subsection describeshow to delay the acquisition of waveforms. (The Delayed time base is notavailable in InstaVu mode (TDS 700A models only); see Incompatible Mod...

Triggering on Waveforms 3–82 TDS 684A, TDS 744A, & TDS 784A User Manual Time Delay (From Delay Trig Menu) Start Posttrigger Acquisition (Triggeron nth Delayed Trigger Event) Time Delay (From Horiz Menu) Time Delay (From Delay Trig Menu) Waiting for nth Event (Where n=5) Main Trigger Point Start ...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–83 NOTE . Due to hardware limitations, the delayed time base cannot be made triggerable when the main trigger type is Logic, any class, or when the maintrigger type is Pulse with Runt or Slew Rate classes selected. For these se...

Triggering on Waveforms 3–84 TDS 684A, TDS 744A, & TDS 784A User Manual By pressing Intensified (side), you can display an intensified zone that showswhere the delayed timebase record may occur (a valid delay trigger eventmust be received) relative to the main trigger on the main time base. ForD...

Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–85 menu. You will still need to display the Horizontal menu if you wish to leaveDelayed Triggerable. The Source menu lets you select which input will be the delayed triggersource. 8. Press Source (main) ➞ Ch1, Ch2, Ch3, Ch4, or...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–87 Measuring Waveforms To make the best use of the TDS Oscilloscope when taking measurements, youneed to know how to use the three types, or classes, of measurements it can take.This section describes how to take the following classes of measurements ...

Measuring Waveforms 3–88 TDS 684A, TDS 744A, & TDS 784A User Manual Automatic measurements are taken over the entire waveform record or, if youspecify gated measurements (see page 3–91), over the region specified by thevertical cursors. Automated measurements are not taken just on the displayedp...

Measuring Waveforms 3–90 TDS 684A, TDS 744A, & TDS 784A User Manual With no menus displayed, the measurement readouts appear far right of thedisplay graticule. (See Figure 3–52.) You can display and continuously update asmany as four measurements at any one time. With any menu displayed, theread...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–91 Be careful when taking automatic measurements on noisy signals. You mightmeasure the frequency of the noise and not the desired waveform. Youroscilloscope helps identify such situations by displaying a low signalamplitude or low...

Measuring Waveforms 3–92 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Using the general purpose knob, move the selected (the active) cursor. Press SELECT to change which cursor is active. Displaying the cursor menu and turning V Bar cursors off will not turngating off. (Gating arrows remain on ...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–93 Histogram sets the values statistically. It selects the most common value eitherabove or below the midpoint (depending on whether it is defining the high orlow reference level). Since this statistical approach ignores short term...

Measuring Waveforms 3–94 TDS 684A, TDS 744A, & TDS 784A User Manual 2. Press High Ref, Mid Ref, Low Ref, or Mid2 Ref (side). High Ref — Sets the high reference level. The default is 90%. Mid Ref — Sets the middle reference level. The default is 50%. Low Ref — Sets the low reference level. The de...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–95 3. Press MEASURE ➞ Select Measrmnt (main) ➞ Delay (side) ➞ Edges (main). A side menu of delay edges and directions will appear.Choose from one of the combinations displayed on the side menu using thefollowing information: The se...

Measuring Waveforms 3–96 TDS 684A, TDS 744A, & TDS 784A User Manual Snapshot Display Figure 3–57: Snapshot Menu and Readout Consider the following rules when taking a snapshot: Be sure to display the waveform properly before taking a snapshot. Snapshotdoes not warn you if a waveform is improperl...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–97 To perform a tutorial that shows you how to take automatic measurements, seeExample 3: Taking Automated Measurements on page 2–19. To learn how the oscilloscope calculates each automatic measurement, seeAppendix B: Algorithms on...

Measuring Waveforms 3–98 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . When cursors measure certain math waveforms, the measurement may not be of time, frequency, or voltage. Cursor measurement of those math waveformsthat are not of time, frequency, or voltage is described in Waveform Math, ...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–99 TDS 700A Models Only: In FastFrame mode, the @ shows the time position ofthe selected cursor relative to the trigger point of the frame that the selectedcursor is in. The D shows the time difference between the two cursors only ...

Measuring Waveforms 3–100 TDS 684A, TDS 744A, & TDS 784A User Manual Non-selected Cursor (Dashed Vertical Bar) Cursor Readout (Paired) Selected Cursor (Solid Vertical Bar) Position of Vertical Bar Cursors (Useful for Locating Cursors Outside the Display) Figure 3–61: Paired Cursor Menu and Reado...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–101 adjust the distance of the solid cursor relative to the dashed cursor. PressSELECT again to resume tracking. To change the cursors speed, press SHIFT before turning the general purposeknob. The cursor moves faster when the SHIF...

Measuring Waveforms 3–102 TDS 684A, TDS 744A, & TDS 784A User Manual To measure the amplitude of a waveform, do the following steps: 1. Press the channel selection button of the channel you wish to measure. Note the vertical scale factor for the channel in the channel readout on screen. 2. Count...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–103 Run an SPC anytime you wish to ensure that the measurements you make aremade with the most accuracy possible. You should also run an SPC if thetemperature has changed more than 5 C since the last SPC was performed. NOTE . When ...

Measuring Waveforms 3–104 TDS 684A, TDS 744A, & TDS 784A User Manual Figure 3–62: Performing a Signal Path Compensation The TDS Oscilloscope lets you compensate the probe, based on the channel it isconnected to, to improve the gain and offset accuracy of the probe. By executingProbe Cal on a cha...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–105 NOTE . Probe Cal is not recommended with the P6139A passive probe. This probe typically has little gain and offset error, and therefore, the improvement inperformance after a Probe Cal is not worth the time needed to do the Pro...

Measuring Waveforms 3–106 TDS 684A, TDS 744A, & TDS 784A User Manual When gain compensation completes, the following actions occur: The clock icon will disappear. If offset compensation is required for the probe installed, the ProbeOffset Compensation message will replace the Probe Gain Compensa...

Measuring Waveforms 3–108 TDS 684A, TDS 744A, & TDS 784A User Manual When you install a probe or power on the oscilloscope with probes installed, theoscilloscope tests the probe at each input. Depending on the probe it finds oneach input, it takes one of the following actions: If the probe has a...

Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 3–109 If the Re-use Probe Calibration data? menu is displayed, you can choose one ofthe following options: Press OK Use Existing Data (side) to use the Probe Cal data last stored tocompensate the probe. Press OK Erase Probe Cal Data ...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–111 Saving Waveforms and Setups The TDS Oscilloscope can save and recall the waveforms you measure and thesetups you use to measure them. It can also output or save a copy of its displayscreen. This section describes how to use the following features ...

Saving Waveforms and Setups 3–112 TDS 684A, TDS 744A, & TDS 784A User Manual 2. To store to a setup internally, choose one of the ten internal storage locations from the side menu To Setup 1, To Setup 2, ... (see Figure 3–65). Now thecurrent setup is stored in that location. 3. To store a setup ...

Saving Waveforms and Setups 3–114 TDS 684A, TDS 744A, & TDS 784A User Manual Saving and Recalling Waveforms TDS Oscilloscope provides four internal reference memories in any of which youcan store a waveform. Waveform thus stored are retained even when you turn theoscilloscope off or unplug it. T...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–115 TDS 700A Models Only: To select the format that the oscilloscope uses to savewaveforms to a disk, press save/recall WAVEFORM ➞ Save Format (main) ➞ Internal, MathCad, or Spreadsheet (side). Internal creates files (.WFM)...

Saving Waveforms and Setups 3–116 TDS 684A, TDS 744A, & TDS 784A User Manual Note that in Figure 3–67, the main menu items Ref2, Ref3, and Ref4 appearshaded while Ref1 does not. References that are empty appear shaded in theMore main menu. To recall a waveform from disk to an internal reference ...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–117 To rearm the oscilloscope for taking a new autosave single acquisition sequence,press RUN/STOP. To avoid loss of reference waveforms, you can save them to floppy disk (use theSAVE/RECALL WAVEFORM menu), before rearming ...

Saving Waveforms and Setups 3–118 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . The amount of free space on the disk is shown in the upper right corner of the display. The oscilloscope shows the amount in Kbytes (or in Mbytes if thefree space is 1 Mbyte or more). To convert the amount to byt...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–119 menu to enter each letter. When you have entered the name, press the side menuOK Accept item. Figure 3–69: File System — Labeling Menu To copy a file or directory, turn the general purpose knob until it scrolls thecurso...

Saving Waveforms and Setups 3–120 TDS 684A, TDS 744A, & TDS 784A User Manual The labeling menu should appear. Turn the general purpose knob or use themain-menu arrow keys to select each letter. Press Enter Char from the mainmenu to enter each letter. When you have entered the name, press the sid...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–121 The oscilloscope prints hardcopies of its display in many formats, which allowsyou to choose from a wide variety of hardcopy devices. It also makes it easier foryou to place oscilloscope screen copies into a desktop pub...

Saving Waveforms and Setups 3–122 TDS 684A, TDS 744A, & TDS 784A User Manual Before you make a hardcopy, you need to set up communications and hardcopyparameters. Do the following procedures to set up for making hardcopies. Set Communications Parameters. To set up the communication parameters fo...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–123 Landscape Format Portrait Format Figure 3–71: Hardcopy Formats 4. Press SHIFT ➞ HARDCOPY MENU ➞ Palette (main) ➞ Hardcopy or Current (side) to specify a hardcopy palette. Current uses the currentpalette settings to crea...

Saving Waveforms and Setups 3–124 TDS 684A, TDS 744A, & TDS 784A User Manual Date and Time Display Figure 3–72: Date and Time Display Set the Date and Time. You might need to set the date and time of the oscillo- scope. To set those parameters, do the following steps. 1. Press SHIFT ➞ UTILITY ➞ ...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–125 To make your hardcopies, use the procedures that follow. Connect to a Hardcopy Device. To connect the oscilloscope directly to a hardcopy device, determine which interface and cable the device uses, and connectaccording...

Saving Waveforms and Setups 3–126 TDS 684A, TDS 744A, & TDS 784A User Manual Clear the Spool. To remove all hardcopies from the spool, press SHIFT ➞ HARDCOPY MENU ➞ Clear Spool (main) ➞ OK Confirm Clear Spool (side). The oscilloscope takes advantage of any unused RAM when spooling hardcopiesto p...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–127 stored hardcopies from disk into your desktop publishing software that runs on aPC-compatible computer. To make your hardcopies, use the procedures that follow. Connect to a Hardcopy Device. To connect a controller with...

Saving Waveforms and Setups 3–128 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . If you defined another name, use it instead of “DEV1”. Also, remember that the device address of the oscilloscope as set with the IBCONF.EXE programshould match the address set in the oscilloscope Utility menu (t...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–129 To transfer data between the oscilloscope and other instruments over the GPIB,do the following tasks to make sure the instruments support GPIB protocols andobserve GPIB Interface requirements. Check for GPIB Protocols. ...

Saving Waveforms and Setups 3–130 TDS 684A, TDS 744A, & TDS 784A User Manual Obtain the Proper Interconnect Cabling. To connect the oscilloscope to a GPIB network, obtain at least one GPIB cable. Connecting two GPIB devices requiresan IEEE Std 488.1-1987 GPIB cable (available from Tektronix, par...

Saving Waveforms and Setups TDS 684A, TDS 744A, & TDS 784A User Manual 3–131 Digitizing Oscilloscope (Rear Panel) Controller GPIB Connector Figure 3–77: Connecting the Oscilloscope to a Controller Select GPIB Port. To select the GPIB port, press SHIFT ➞ UTILITY ➞ System (main) ➞ I/O (pop-up) ➞ P...

Saving Waveforms and Setups 3–132 TDS 684A, TDS 744A, & TDS 784A User Manual GPIB Configuration Menu Figure 3–78: Utility Menu See Printing a Hardcopy, on page 3–120. See the TDS Programmer Manual, Tektronix part number 070-8709-XX. To Find More Information

TDS 684A, TDS 744A, & TDS 784A User Manual 3–133 Determining Status and Accessing Help The TDS Oscilloscope can display the status of its internal systems. It alsoprovides an on-line help system. This section describes how to use the followingtwo features: Status which displays a snapshot of sys...

Determining Status and Accessing Help 3–134 TDS 684A, TDS 744A, & TDS 784A User Manual Firmware Version Figure 3–79: Status Menu — System Figure 3–80: Banner Display

Determining Status and Accessing Help TDS 684A, TDS 744A, & TDS 784A User Manual 3–135 Displaying Help To use the on-line help system: Press HELP to provide on-screen information on any front panel button, knob ormenu item. (See Figure 3–81.) Figure 3–81: Initial Help Screen When you press that ...

TDS 684A, TDS 744A, & TDS 784A User Manual 3–137 Using Features for Advanced Applications The TDS Oscilloscope provides powerful features for testing and digitally proces-sing the waveforms you acquire. This section describes how to use the followingfeatures: Limit Testing — for testing the wave...

Using Features for Advanced Applications 3–138 TDS 684A, TDS 744A, & TDS 784A User Manual To use limit testing, you must do four tasks: Create the limit test template from a waveform. Specify the channel to compare to the template. Specify the action to take if incoming waveform data exceeds the...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–139 Figure 3–83: Acquire Menu — Create Limit Test Template 4. Press ± V Limit (side). Enter the vertical (voltage) tolerance value using the general purpose knob or keypad. 5. Press ± H Limit (side). Enter the ...

Using Features for Advanced Applications 3–140 TDS 684A, TDS 744A, & TDS 784A User Manual NOTE . To view the waveform data as well as the template envelope, it might be useful to select the Dots display style. (See Select the Display Style onpage 3–28.) Now specify the channel that will acquire ...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–141 NOTE . The button labeled Stop After Limit Test Condition Met corresponds to the Limit Test Condition Met menu item in the Stop After main menu. You can turnthis button on in the Limit Test Setup menu, but ...

Using Features for Advanced Applications 3–142 TDS 684A, TDS 744A, & TDS 784A User Manual Waveform Math The TDS Oscilloscope provides a means for you to mathematically manipulateyour waveforms. For example, you might have a waveform clouded bybackground noise. You can obtain a cleaner waveform b...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–143 3. Press Set Function to (side) repeatedly to cycle it to inv (invert), intg, or diff. Waveform integration (intg) is described on page 3–165, and waveformdifferentiation (diff) is described on page 3–161. ...

Using Features for Advanced Applications 3–144 TDS 684A, TDS 744A, & TDS 784A User Manual 5. Press OK Create Math Wfm (side) to perform the function. You can also select whether or not you wish to average a certain math waveform;to do so, perform the following steps: 1. Press MORE ➞ Math1, Math2...

Using Features for Advanced Applications 3–146 TDS 684A, TDS 744A, & TDS 784A User Manual Normal Waveform of an Impulse Response FFT Waveform of the Magnitude Response FFT Waveform of the Phase Response Figure 3–86: System Response to an Impulse To obtain an FFT of your waveform, do the followin...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–147 Figure 3–87: Define FFT Waveform Menu 7. Press Set FFT Vert Scale to (side) repeatedly to choose from the following vertical scale types: dBV RMS — Magnitude is displayed using log scale, expressed in dBrel...

Using Features for Advanced Applications 3–148 TDS 684A, TDS 744A, & TDS 784A User Manual Hamming — Very good window for resolving frequencies that are veryclose to the same value with somewhat improved amplitude accuracy overthe rectangular window. Hanning — Very good window for measuring ampli...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–149 Once you have displayed an FFT math waveform, use cursors to measure itsfrequency amplitude or phase angle. 1. Be sure MORE is selected in the channel selection buttons and that the FFT math waveform is sel...

Using Features for Advanced Applications 3–150 TDS 684A, TDS 744A, & TDS 784A User Manual Figure 3–89: Cursor Measurement of an FFT Waveform 10. Press Function (main) ➞ Paired (side). 11. Use the technique just outlined to place the vertical bar of each paired cursor to the points along the hori...

Using Features for Advanced Applications 3–152 TDS 684A, TDS 744A, & TDS 784A User Manual FFTs Transform Time Records to Frequency Records. The FFT time domain record just described is input for the FFT. Figure 3–91 shows the transformationof that time domain data record into an FFT frequency do...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–153 The following topics contain information to help you display your FFT properly. Adjust for a Non-Clipped Display. To properly display your FFT waveform, scale the source waveform so it is not clipped. You s...

Using Features for Advanced Applications 3–154 TDS 684A, TDS 744A, & TDS 784A User Manual Selecting the right acquisition mode can produce less noisy FFTs. Set up in Sample. Use sample mode until you have set up and turned on your FFT. Sample mode can acquire repetitive and nonrepetitive wavefor...

Using Features for Advanced Applications 3–156 TDS 684A, TDS 744A, & TDS 784A User Manual Nyquist Frequency Point Frequency Amplitude Actual Frequencies Aliased Frequencies Figure 3–92: How Aliased Frequencies Appear in an FFT When you set up an FFT math waveform to display the phase angle of th...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–157 For records with a 100 K length (TDS 700A models with Option 1M only),set the trigger position to 5%. Use the horizontal position knob to move thetrigger T on screen to the center horizontal graticule line....

Using Features for Advanced Applications 3–158 TDS 684A, TDS 744A, & TDS 784A User Manual To learn how to optimize your display of FFT data, read about how the FFTwindows data before computing the FFT math waveform. Understanding FFTwindowing can help you get more useful displays. Windowing Proc...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–159 FFT Time Domain Record FFT Time Domain Record After Windowing FFT Window FFT Frequency Domain Record FFT Xs Figure 3–93: Windowing the FFT Time Domain Record You can often determine the best window empirica...

Using Features for Advanced Applications 3–160 TDS 684A, TDS 744A, & TDS 784A User Manual Window Characteristics. When evaluating a window for use, you may want to examine how it modifies the FFT time domain data. Figure 3–94 shows eachwindow, its bandpass characteristic, bandwidth, and highest ...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–161 Rectangular Window 0 dB -20 -40 -50 Hanning Window 0 dB -20 -40 -60 -80 Hamming Window 0 dB -20 -40 -60 Blackman-Harris Window 0 dB -20-40-60-80 -100 -101 FFT Window Type Bandpass Filter 0.89 –3 dB Bandwidt...

Using Features for Advanced Applications 3–162 TDS 684A, TDS 744A, & TDS 784A User Manual Derivative waveforms are used in the measurement of slew rate of amplifiers andin educational applications. You can store and display a derivative mathwaveform in a reference memory, then use it as a source...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–163 Derivative Math Waveform Source Waveform Figure 3–95: Derivative Math Waveform Once you have displayed your derivative math waveform, you can use automatedmeasurements to make various parameter measurements...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–165 clipped portion. Also, the automated measurement Pk-Pk will display a clippingerror message if turned on (see To Take Automated Measurements onpage 3–163). If your derivative waveform is clipped, try either...

Using Features for Advanced Applications 3–166 TDS 684A, TDS 744A, & TDS 784A User Manual The integral math waveform, derived from the sampled waveform, is computedbased on the following equation: y(n) + scale n i + 1 x(i) ) x(i * 1) 2 T Where: x(i) is the source waveform y(n) is a point in the ...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–167 Source Waveform Integral Math Waveform Figure 3–97: Integral Math Waveform Once you have displayed your integrated math waveform, use cursors to measureits voltage over time. 1. Be sure MORE is selected (li...

Using Features for Advanced Applications 3–168 TDS 684A, TDS 744A, & TDS 784A User Manual Source Waveform Integral Math Waveform Figure 3–98: H Bars Cursors Measure an Integral Math Waveform 7. Press Function (main) ➞ V Bars (side). Use the general purpose knob to align one of the two vertical c...

Using Features for Advanced Applications TDS 684A, TDS 744A, & TDS 784A User Manual 3–169 Read the time difference between the long vertical bars of the pairedcursors from the : readout. You can also use automated measurements to measure integral math waveforms.Use the same procedure as is found...

Using Features for Advanced Applications 3–170 TDS 684A, TDS 744A, & TDS 784A User Manual If you wish to see the zoom factor (2X, 5X, etc.) you need to turn Zoom on:press ZOOM ➞ On (side). The vertical and horizontal zoom factors appear on screen. Whether Zoom is on or off, you can press Reset Z...

TDS 684A, TDS 744A, & TDS 784A User Manual A–1 Appendix A: Options and Accessories This appendix describes the various options as well as the standard and optionalaccessories that are available for the TDS Oscilloscope. Options Tektronix will ship the options shown in Table A–1: Table A–1: Optio...

Appendix A: Options and Accessories A–2 TDS 684A, TDS 744A, & TDS 784A User Manual Table A–1: Options (Cont.) Description Label Option # 1M(TDS 7X4A) 130,000 record length(TDS 7X4A) Extend TDS 7X4A record length from 50,000 standard to500,000 samples on one channel, 250,000 on two channels,and 1...

Appendix A: Options and Accessories TDS 684A, TDS 744A, & TDS 784A User Manual A–3 Table A–1: Options (Cont.) Description Label Option # 95 Calibration Data Report 96 Calibration Certificate Certificate of Calibration which states this instrument meets orexceeds all warranted specifications and ...

Appendix A: Options and Accessories A–4 TDS 684A, TDS 744A, & TDS 784A User Manual Optional Accessories You can also order the optional accessories listed in Table A–3. Table A–3: Optional Accessories Accessory Part Number Service Manual 070-8992-xx Plotter (GPIB and Centronics Standard) HC100 O...

Appendix A: Options and Accessories TDS 684A, TDS 744A, & TDS 784A User Manual A–5 AM 503S — DC/AC Current probe system, AC/DC. Uses A6302 CurrentProbe. AM 503S Option 03: DC/AC Current probe system, AC/DC. Uses A6303Current Probe. P6021 AC Current probe. 120 Hz to 60 MHz. P6022 AC Current probe...

TDS 684A, TDS 744A, & TDS 784A User Manual B–1 Appendix B: Algorithms The TDS Oscilloscope can take 25 automatic measurements. By knowing how itmakes these calculations, you may better understand how to use your oscillo-scope and how to interpret your results. Measurement Variables The oscillosc...

Appendix B: Algorithms B–2 TDS 684A, TDS 744A, & TDS 784A User Manual The oscilloscope calculates the histogram-based and values as follows: 1. It makes a histogram of the record with one bin for each digitizing level (256 total). 2. It splits the histogram into two sections at the halfway point...

Appendix B: Algorithms TDS 684A, TDS 744A, & TDS 784A User Manual B–3 The oscilloscope also measures several values itself that it uses to help calculatemeasurements. RecordLength — is the number of data points in the time base. You set it with the Horizontal menu Record Length item. Start — is ...

Appendix B: Algorithms TDS 684A, TDS 744A, & TDS 784A User Manual B–5 Measurement Algorithms The automated measurements are defined and calculated as follows. = – The arithmetic area for one waveform. Remember that one waveform is notnecessarily equal to one cycle. For cyclical data you may pref...

Appendix B: Algorithms B–6 TDS 684A, TDS 744A, & TDS 784A User Manual Amplitude (voltage) measurement. The mean over one waveform cycle. Fornon-cyclical data, you might prefer to use the Mean measurement. If = then return the (interpolated) value at . = ŕ ( )dt ( * ) For details of the integrati...

Appendix B: Algorithms TDS 684A, TDS 744A, & TDS 784A User Manual B–7 2. From this sample, continue the search to find the first (negative) crossing of . The time of this crossing is . (Use linear interpolation if necessary.) 3. From , continue the search, looking for a crossing of . Update if s...

Appendix B: Algorithms TDS 684A, TDS 744A, & TDS 784A User Manual B–9 Note that this value should never be negative (unless High or Low are setout-of-range). Timing measurement. The distance (time) between (default = 50%) amplitude points of a negative pulse. If = ‘–’ then = – else = – Amplitude...

Appendix B: Algorithms TDS 684A, TDS 744A, & TDS 784A User Manual B–11 2. From this sample, continue the search to find the first (positive) crossing of . The time of this crossing is the low rise time or . (Use linear interpolation if necessary.) 3. From , continue the search, looking for a cro...

Appendix B: Algorithms B–12 TDS 684A, TDS 744A, & TDS 784A User Manual The integration algorithm used by the oscilloscope is as follows: ŕ B A W(t)dt is approximated by ŕ B A W ^ (t)dt where: W(t) is the sampled waveform ^ ( ) is the continuous function obtained by linear interpolation of W(t) A...

TDS 684A, TDS 744A, & TDS 784A User Manual C–1 Appendix C: Packaging for Shipment If you ship the TDS Oscilloscope, pack it in the original shipping carton andpacking material. If the original packing material is not available, package theinstrument as follows: 1. Obtain a corrugated cardboard s...

TDS 684A, TDS 744A, & TDS 784A User Manual D–1 Appendix D: Factory Initialization Settings Recalling the factory setup establishes the initialization settings shown inTable D–1 to set the TDS Oscilloscope to a known default state. Table D–1: Factory Initialization Defaults Control Changed by Fac...

TDS 684A, TDS 744A, & TDS 784A User Manual E–1 Appendix E: Probe Selection The TDS Oscilloscope can use a variety of Tektronix probes for taking differentkinds of measurements. To help you decide what type of probe you need, thissection introduces the five major types of probes: passive, active,...

Appendix E: Probe Selection E–2 TDS 684A, TDS 744A, & TDS 784A User Manual Maximum amplitude sensitivity using 1X high impedance Large voltage range (between 15 and 500 V) Qualitative or go/no-go measurements Low impedance probes measure frequency more accurately than general purposeprobes, but ...

Appendix E: Probe Selection TDS 684A, TDS 744A, & TDS 784A User Manual E–3 Active Voltage Probes Active voltage probes, sometimes called “FET” probes, use active circuitelements such as transistors. There are three classes of active probes: High speed active Differential active Fixtured active A...

Appendix E: Probe Selection E–4 TDS 684A, TDS 744A, & TDS 784A User Manual precisely connect your instrument to your device-under-test. These probes havethe same electrical characteristics as high speed, active probes but use a smallermechanical design. Current Probes Current probes enable you t...

Appendix E: Probe Selection TDS 684A, TDS 744A, & TDS 784A User Manual E–5 Optical Probes Optical probes let you blend the functions of an optical power meter with thehigh-speed analog waveform analysis capability of an oscilloscope. You have thecapability of acquiring, displaying, and analyzing...

TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–1 Glossary AC coupling A type of signal transmission that blocks the DC component of a signal butuses the dynamic (AC) component. Useful for observing an AC signal that isnormally riding on a DC signal. Accuracy The closeness of the indicated v...

Glossary Glossary–2 TDS 684A, TDS 744A, & TDS 784A User Manual Attenuation The degree the amplitude of a signal is reduced when it passes through anattenuating device such as a probe or attenuator. That is, the ratio of the inputmeasure to the output measure. For example, a 10X probe will attenu...

Glossary TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–3 Cycle area A measurement of waveform area taken over one cycle. Expressed involt-seconds. Area above ground is positive; area below ground is negative. Cycle mean An amplitude (voltage) measurement of the arithmetic mean over one cyc...

Glossary Glossary–4 TDS 684A, TDS 744A, & TDS 784A User Manual Fall time A measurement of the time it takes for the trailing edge of a pulse to fallfrom a HighRef value (typically 90%) to a LowRef value (typically 10%) ofits amplitude. Frequency A timing measurement that is the reciprocal of the...

Glossary TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–5 High The value used as 100% in automated measurements (whenever high ref,mid ref, and low ref values are needed as in fall time and rise time measure-ments). May be calculated using either the min/max or the histogrammethod. With the...

Glossary Glossary–6 TDS 684A, TDS 744A, & TDS 784A User Manual Knob A rotary control. Logic state trigger The oscilloscope checks for defined combinatorial logic conditions onchannels 1, 2, and 3 on a transition of channel 4 that meets the set slope andthreshold conditions. If the conditions of ...

Glossary TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–7 Negative overshoot measurement Amplitude (voltage) measurement. NegativeOvershoot + Low * Min Amplitude 100% Negative width A timing measurement of the distance (time) between two amplitudepoints — falling-edge MidRef (default 50%) a...

Glossary Glossary–8 TDS 684A, TDS 744A, & TDS 784A User Manual Pixel A visible point on the display. The oscilloscope display is 640 pixels wideby 480 pixels high. Pop-up Menu A sub-menu of a main menu. Pop-up menus temporarily occupy part of thewaveform display area and are used to present addi...

Glossary TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–9 fill a waveform record from a single trigger event. Use real-time sampling tocapture single-shot or transient events. Record length The specified number of samples in a waveform. Reference memory Memory in a oscilloscope used to stor...

Glossary TDS 684A, TDS 744A, & TDS 784A User Manual Glossary–11 Waveform interval The time interval between record points as displayed. XY format A display format that compares the voltage level of two waveform recordspoint by point. It is useful for studying phase relationships betweentwo wavef...

TDS 684A, TDS 744A, & TDS 784A User Manual Index–1 Index Numbers 1/seconds (Hz), Cursor menu, 3–10120 MHz, Vertical menu, 3–12250 MHz, Vertical menu, 3–12 A AC coupling, Glossary–1AC line voltage, trigger input, 3–50AC, Main Trigger menu, 3–58Accept Glitch, Main Trigger menu, 3–73Accessories, A–...

Index Index–2 TDS 684A, TDS 744A, & TDS 784A User Manual Average, Incompatible with InstaVu, 3–46Average acquisition mode, 3–20, 3–48, Glossary–2Average mode, Acquire menu, 3–138Average, Acquire menu, 3–23Average, More menu, 3–144 B Bandwidth, Glossary–2 Selecting, 3–12 Bandwidth, Vertical menu,...

Index TDS 684A, TDS 744A, & TDS 784A User Manual Index–3 Color Matches Contents, 3–35, 3–36Hardcopy, 3–34Hue, 3–34Lightness, 3–34Map Math, 3–35Map Reference, 3–35Math, 3–35Monochrome, 3–34Normal, 3–34Options, 3–36Palette, 3–33Persistence Palette, 3–34Ref, 3–36Reset All Mappings To Factory, 3–36R...

Index Index–4 TDS 684A, TDS 744A, & TDS 784A User Manual with math waveforms, 3–153, 3–169 DC, Main Trigger menu, 3–58Define Inputs, Main Trigger menu, 3–65, 3–67, 3–69Define Logic, Main Trigger menu, 3–66, 3–68Delay by Events, Delayed Trigger menu, 3–84Delay by Time, Delayed Trigger menu, 3–84D...

Index TDS 684A, TDS 744A, & TDS 784A User Manual Index–5 E Edge trigger, 3–50, 3–57, Glossary–3 How to set up, 3–58–3–86Readout, 3–57 Edge, Main Trigger menu, 3–57, 3–58Edges, Measure Delay menu, 3–95Either, Main Trigger menu, 3–73, 3–74, 3–77empty, Saved waveform status, 3–114Encapsulated Posts...

Index Index–6 TDS 684A, TDS 744A, & TDS 784A User Manual Goes TRUE, Main Trigger menu, 3–66, 3–68GPIB, 2–5, 3–129–3–132, Glossary–4 Connecting to, 3–130Interconnect cabling, 3–130Interface requirements, 3–129Procedures for using, 3–130Protocols, 3–129Selecting and configuring the port, 3–131Typi...

Index TDS 684A, TDS 744A, & TDS 784A User Manual Index–7 Intensified, 3–83, 3–84Main Scale, 3–15Record Length, 3–15Set to 10%, 3–16Set to 50%, 3–16Set to 90%, 3–16Time Base, 3–83Trigger Position, 3–15 HORIZONTAL MENU button, 3–53, 3–83Horizontal POSITION knob, 3–14, 3–39Horizontal Readouts, 3–13...

Index Index–8 TDS 684A, TDS 744A, & TDS 784A User Manual Main Trigger menu, 3–57, 3–58, 3–64, 3–67, 3–68, 3–72, 3–74, 3–77 AC, 3–58Accept Glitch, 3–73AND, 3–66, 3–68Auto, 3–59Ch1, Ch2 ..., 3–58, 3–65, 3–68, 3–69, 3–73, 3–74, 3–76, 3–77 Class, 3–76 Pattern, 3–64Runt, 3–74Setup/Hold, 3–68Slew Rate...

Index TDS 684A, TDS 744A, & TDS 784A User Manual Index–9 Fall time, 3–88Frequency, 2–19, 3–88, Glossary–4Gated, Glossary–4High, 3–88, Glossary–5Low, 3–89, Glossary–6Maximum, 3–89, Glossary–6Mean, 3–89, Glossary–6Minimum, 3–89, Glossary–6Negative duty cycle, 3–89Negative overshoot, 3–89Negative w...

Index TDS 684A, TDS 744A, & TDS 784A User Manual Index–13 Source, Delayed Trigger menu, 3–85Source, Main Trigger menu, 3–58, 3–73, 3–74, 3–76, 3–77 Spectral, Color menu, 3–34Spooler, Hardcopy, 3–126Start up, 1–3State trigger, 3–61, 3–67–3–86 How to set up, 3–67–3–86 State, Main Trigger menu, 3–6...