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 694C Digital Real-Time Oscilloscope 071-0473-00 This document supports firmware version 1.0 and above.
Page 3 Copyright © Tektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions. Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the...
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 6 ........3–100 TDS 694C User Manual...
Page 7 Appendix F: Programmer Disk ....... F–1 Glossary Index TDS 694C User Manual...
Page 8: Table Of Contents
3–18 Figure 3–9: Real-Time Sampling ......3–19 TDS 694C User Manual...
Page 9 ..3–64 Figure 3–36: TLA 714 to TDS 694C ......
Page 10 ........3–153 Figure 3–81: Dual Waveform Math Main and Side Menus ..3–154 TDS 694C User Manual...
Page 11 ........D–5 Figure F–1: Equipment Needed to Run the Example Programs ..F–1 TDS 694C User Manual...
Page 12 Table of Contents List of Tables Table 1–1: Key Features of TDS 694C ......1–3 Table 1–2: Fuse and fuse cap part numbers .
Page 13 Table of Contents TDS 694C User Manual viii...
Page 14 Do Not Operate in Wet/Damp Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. TDS 694C User Manual...
Page 15 Acquisition circuitry in the TDS 694C is very susceptible to damage from electrostatic discharge and from overdrive signals. To prevent electrostatic damage to the TDS 694C, be sure to operate the oscilloscope only in a static-controlled environment. Be sure to discharge to ground any electrostatic charge that may be present on cables and probes before attaching them to the oscilloscope.
Page 16 Preface This is the User Manual for the TDS 694C Oscilloscopes The chapter Getting Started briefly describes the TDS 694C Oscilloscopes, prepares you to install it, and tells you how to put it into service. The chapter Operating Basics covers basic principles of the operation of the oscilloscope.
Page 17 Sometimes you may have to make a selection from a pop-up menu: Press TRIGGER MENU Type (main) Edge (pop-up). In this example, you repeatedly press the main menu button Type until Edge is highlighted in the pop-up menu. TDS 694C User Manual...
Page 18: Waveforms
Product Description The Tektronix TDS 694C Digital Real-Time 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 key features: H An analog bandwidth of 3 GHz simultaneous on 4 channels...
Page 19 H Dual Window Zoom, which shows a waveform magnified and unmagnified on the same display (see Using Dual Window Mode on page 3–35) H Sample, envelope, average, and peak-detect modes (see Table 1–1, on page 1–3.) TDS 694C User Manual 1–2...
Page 20: Table 1-1: Key Features Of Tds 694C
Product Description TDS 694C Features Table 1–1 lists some key TDS 694C features that are covered in this manual. Table 1–1: Key Features of TDS 694C Feature TDS 694C No. of channels Digitizing rate, max. 10 GS/s No. of Channels. @ maximum rate...
Page 21 Product Specification The product specification is found in the technical reference TDS 500D, TDS 600C, & TDS 700D Technical Reference (Performance Verification and Specifications) that is shipped as a standard accessory with the TDS 694C Oscil- loscopes. TDS 694C User Manual...
Page 22 Start Up Before you use the TDS 694C Oscilloscopes, ensure that it is properly installed and powered on. Preparation To ensure maximum accuracy for your most critical measurements, you should know about signal path compensation and the proper use of the probe you choose to use with your oscilloscope.
Page 23 071-0496-xx). CAUTION. To prevent damage to the instrument caused by over heating, the TDS 694C must have adequate airflow. Verify air intake and exhaust ventilation in the cabinet as specified in Step 2. 2. Leave space for cooling for both rackmount and bench configurations. Do this by verifying that the air intake and exhaust holes on the sides and bottom of the cabinet are free of any airflow obstructions.
Page 24: Figure 1-1: Rear Panel Controls Used In Start Up
1. Check that the rear-panel principal power switch is on (see Figure 1–1). The principal power switch controls all AC power to the instrument. 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). TDS 694C User Manual 1–7...
Page 25: Figure 1-2: On/Stby Button
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 26 Overview This chapter describes the basic concepts of operating the TDS 694C Digital Real-Time Oscilloscope. Understanding the basic concepts of your oscilloscope will help you use it much more effectively. The first section, Operating Interface Maps, quickly shows you how the oscilloscope controls are organized and where you can read about them.
Page 27 Overview TDS 694C User Manual 2–2...
Page 28: File System
Operating Interface Maps This section contains illustrations, or maps, of the display, the front and rear panels, and the menu system of the TDS 694C Oscilloscopes. These maps will help you understand and operate the oscilloscope. This section also contains a visual guide to using the menu system.
Page 29 Probe Calibration, page 3–109 Vertical Controls, page 3–9 Zoom, page 3–32 Ground Triggering, page 3–39 Delay Triggering, page 3–80 Edge Triggering, page 3–47 Horizontal Controls, Logic Triggering, page 3–51 page 3–13 Pulse Triggering, page 3–67 TDS 694C User Manual 2–4...
Page 30 Rear Panel Connectors Security Bracket page 1–6 page 1–6 AUX TRIGGER INPUT – (Provides Auxiliary Trigger Signal Input) MAIN TRIGGER OUTPUT – (Provides Main Trigger (TTL) Output) DELAYED TRIGGER OUTPUT – (Provides Delayed Trigger (TTL) Output) TDS 694C User Manual 2–5...
Page 31 The side menu Channel level and with choices of waveform source. specific actions. Vertical scale, Trigger parameters, page 3–9 page 3–46 The main menu with Horizontal scale and time choices of major actions base type, page 3–13 TDS 694C User Manual 2–6...
Page 32 Press one of these buttons to select from main menu. 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. TDS 694C User Manual 2–7...
Page 33 Press to display pop-up menus. Press here to remove menus from 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. TDS 694C User Manual 2–8...
Page 34: Figure 2-1: Deskew Fixture Connections (Two P6249 Probes Shown)
Start this tutorial by doing Setting Up for the Examples on this page. Setting Up for the Examples Perform the following tasks to connect input signals to the TDS 694C Oscillo- scopes, to reset it, and to become acquainted with its display screen. Once completed, these tasks ready the oscilloscope for use in the examples that follow.
Page 35: Figure 2-2: Connecting A Probe For The Examples (P6249 Shown)
(You can reset the oscilloscope anytime you begin a new task and need to “start fresh” with known default settings.) 1. Press the save/recall SETUP button to display the Setup menu. (See Figure 2–3.) SETUP Button Figure 2–3: SETUP Button Location TDS 694C User Manual 2–10...
Page 36: Figure 2-4: The Setup Menu
Note that a clock icon appears on screen. The oscilloscope displays this icon when performing operations that take longer than several seconds. 4. Press SET LEVEL TO 50% (see Figure 2–5) to be sure the oscilloscope triggers on the input signal. TDS 694C User Manual 2–11...
Page 37: Figure 2-5: Trigger Controls
This indicator points to the ground level for the channel when its vertical offset is set to 0 V in the vertical menu; when vertical offset is not set to 0 V, it points to the vertical offset level. TDS 694C User Manual 2–12...
Page 38: Figure 2-6: The Display After Factory Initialization
Example 1: Displaying a Waveform The TDS 694C Oscilloscopes provides front panel knobs for you to adjust a waveform, or it can automatically set up its controls to display a waveform. Do the following tasks to learn how to adjust a waveform and how to autoset the TDS 694C Oscilloscopes.
Page 39: Figure 2-7: 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 ms/div now, and you should see two complete waveform cycles on the display. TDS 694C User Manual 2–14...
Page 40: Figure 2-8: Trigger Controls
You may see these signal components at higher HORIZONTAL SCALE settings. You can reduce these signal components using shorter probe ground and signal leads. TDS 694C User Manual 2–15...
Page 41: Figure 2-9: Autoset Button Location
Figure 2–10: The Display After Pressing Autoset Example 2: Displaying Multiple Waveforms The TDS 694C Oscilloscopes 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.
Page 42: Figure 2-11: The Channel Buttons And Lights
There are several other important things to observe: H The channel readout on the display now shows the settings for both Ch1 and Ch2. H There are two channel indicators at the left edge of the graticule. Right now, they overlap. TDS 694C User Manual 2–17...
Page 43 7. Press GND (side) to toggle the selection to ground (GND). That changes the input coupling of channel 2 from DC to GND. The channel readout for channel 2 (near the bottom of the graticule) now shows a ground indicator. TDS 694C User Manual 2–18...
Page 44: Figure 2-12: The Vertical Main Menu And Coupling Side Menu
GND channel 2 setting to the DC coupling setting of channel 1. 2. Press CH 2 DC (side) to toggle the selection to DC. That returns the input coupling of channel 2 to its initial state. TDS 694C User Manual 2–19...
Page 45: Figure 2-13: The Menus After Changing Channels
2. Press WAVEFORM OFF again to remove the channel 1 waveform. Example 3: Taking Automated Measurements The TDS 694C Oscilloscopes can measure many waveform parameters automatically and read out the results on screen. Do the following tasks to discover how to set up the oscilloscope to measure waveforms automatically.
Page 46 The measurement readout includes the notation Ch1, meaning that the measurement is taken on the channel 1 waveform. (To take a measurement on another channel, select that channel, and then select the measurement.) TDS 694C User Manual 2–21...
Page 47: 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. TDS 694C User Manual 2–22...
Page 48: 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%. TDS 694C User Manual 2–23...
Page 49: Figure 2-16: General Purpose Knob Indicators
The numeric keypad also provides multipliers for engineering exponents, such as m for milli, M for mega, and m for micro. To enter these multiplier values, press the SHIFT button, and then press the multiplier. TDS 694C User Manual 2–24...
Page 50 2. Press Again (side) to do another snapshot and update the snapshot measure- ments. 3. Press Remove Measrmnt (main) to remove the snapshot display. (You can also press CLEAR MENU, but a new snapshot will be executed the next time you display the Measure menu.) TDS 694C User Manual 2–25...
Page 51: Figure 2-17: Snapshot Of Channel 1
Figure 2–17: Snapshot of Channel 1 Example 4: Saving Setups The TDS 694C Oscilloscopes can save its controls settings and recall them later to quickly re-establish a setup. It provides ten storage locations to store up to ten setups. It also provides a file system, so that you can also save setups to a floppy disk, an optional hard disk, or an external Zip drive.
Page 52: Figure 2-18: Save/Recall Setup Menu
(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.) Figure 2–18: Save/Recall Setup Menu TDS 694C User Manual 2–27...
Page 53 The positive width measurement is now removed from the display because you selected it after you saved the setup. 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). TDS 694C User Manual 2–28...
Page 54 The topics just listed contain steps that you perform to accomplish the task that the topic defines. You should read Conventions on page xi of Preface before reading about these tasks. Each topic just listed comprises more basic operation tasks and topics. A list of these tasks follows. TDS 694C User Manual 3–1...
Page 55: Saving And Recalling Setups
..........3–177 TDS 694C User Manual 3–2...
Page 56 Acquiring and Displaying Waveforms To use the TDS 694C Oscilloscopes to measure or monitor waveforms, you need to know how to acquire, select, and display those waveforms properly. To help you do so, this section describes how to do the following tasks:...
Page 57 Acquiring and Displaying Waveforms Setting up Automatically: Autoset and Reset The TDS 694C Oscilloscopes can automatically obtain and display a stable waveform of usable size. It can also be reset to its factory default settings. This subsection describes how to execute Autoset and reset, and lists the default settings in effect after an Autoset.
Page 58: Table 3-1: Autoset Defaults
Vertical Scale As determined by the signal level Vertical Coupling Vertical Offset 0 volts, except offsetable probes, the offset will be set to the mid point of the signal Zoom TDS 694C User Manual 3–5...
Page 59: Figure 3-1: The Channel Readout
Selecting Channels The TDS 694C Oscilloscopes applies all actions based on a specific waveform, such as taking measurements or applying any changes it receives to the vertical control settings, to the selected waveform. You can select a channel waveform, a math waveform, or a reference waveform.
Page 60: Figure 3-2: Waveform Selection Priority
If you start by turning off the MORE waveforms, all the MORE waveforms will be turned off before going to the channel waveforms. If you turn off a channel that is a trigger source, it continues to be the trigger source even though the waveform is not displayed. TDS 694C User Manual 3–7...
Page 61 3–150. Scaling and Positioning Waveforms The TDS 694C Oscilloscopes allows you to scale (change the vertical or horizontal size) and position (move up, down, left, or right) waveforms on screen for best display. (Figure 3–3 shows the results of both vertical and horizontal scaling and positioning.) This section first tells you how to quickly check and set...
Page 62: Figure 3-3: Scaling And Positioning
Scaled Horizontally Figure 3–3: Scaling and Positioning To Change Vertical Scale The TDS 694C Oscilloscopes permits you to change vertical scale and position and Position quickly from the front panel using dedicated control knobs. To change the vertical scale and position: 1.
Page 63: Figure 3-4: Vertical Readouts And Channel Menu
By changing the vertical scale, you can focus on a particular portion of a waveform. 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. TDS 694C User Manual 3–10...
Page 64 To make such changes, do the following procedures: NOTE. The TDS 694C requires a P6339 probe for AC coupling, 10 MW input impedance, and bandwidth selections to appear in the menus. Coupling. To choose the type of coupling for attaching the input signal to the...
Page 65: Figure 3-5: Record View And Time Base Readouts
Record View Readout Time Base Readout Extd Acq FastFrame Set up Setup Figure 3–5: Record View and Time Base Readouts TDS 694C User Manual 3–12...
Page 66: Figure 3-6: Horizontal Controls
Acquiring and Displaying Waveforms To Change Horizontal The TDS 694C Oscilloscopes provides control of horizontal position and scale Scale and Position using the horizontal front panel knobs. By changing the horizontal position, you can move the waveform right or left to see different portions of the waveform.
Page 67 Record Length (main). Select the record length desired from the side menu. Press –more– to see additional choices: TDS 694C Oscilloscopes have standard record lengths up to 30,000 points. Record lengths up to 120,000 with Option 1M. 2. To fit an acquired waveform (or with Extended Acquisition On, an acquisi-...
Page 68 H How the different acquisition modes (such as interpolation) affect this process H How to select among these modes Following these descriptions are procedures for selecting the sampling and acquisition modes, beginning with Checking the Acquisition Readout on page 3–20. TDS 694C User Manual 3–15...
Page 69: Figure 3-7: Acquisition: Input Analog Signal, Sample, And Digitize
Interval for one waveform record point. Samples for a record point. Figure 3–8: Several Points May be Acquired for Each Point Used TDS 694C User Manual 3–16...
Page 70 The Acquisition Modes The TDS 694C oscilloscope supports the following four acquisition modes: Sample, Envelope, Average, and Peak Detect. Sample (the mode most commonly used), Peak Detect operate in real time on a single trigger event, provided that the oscilloscope can acquire enough samples for each trigger event.
Page 71 NOTE. For record lengths of 30,000 points of less, the Peak Detect sample interval will be 100ps. For record lengths of 50,000 points or greater, the Peak Detect sample interval will be 400ps. TDS 694C User Manual 3–18...
Page 72 Use to reveal variations in the signal across time. Average 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 3–10: How the Acquisition Modes Work TDS 694C User Manual 3–19...
Page 73: Acquisition Modes
To choose the event that stops the acquiring waveforms, do the following step: Press SHIFT ACQUIRE MENU Stop After (main) RUN/STOP button only, Single Acquisition Sequence, or Limit Test Condition Met (side). (See Figure 3–12.) TDS 694C User Manual 3–20...
Page 74 To toggle the RUN/STOP function you can easily step on the foot switch. The foot switch connects to the TDS 694C Oscillo- scope’s RS–232 port located on the rear panel. See Appendix A: Table A–2, for Standard accessories Set Communications Parameters.
Page 75 Methods to Check and Eliminate. To quickly check for aliasing, slowly increase the horizontal scale (time per division setting). If the shape of the displayed waveform changes drastically or becomes stable at a faster time base setting, your waveform was probably aliased. TDS 694C User Manual 3–22...
Page 76 Either can detect faster signal components over time. Customizing the Display The TDS 694C Oscilloscopes can display waveform records and other display elements in different ways. This section describes how to adjust the oscilloscope display style, intensity level, graticule, and format.
Page 77 Set Display Readout Readout options control whether the trigger indicator, trigger level bar, and Options current date and time appear on the display. The options also control what style trigger level bar, long or short, is displayed. TDS 694C User Manual 3–24...
Page 78 — one for the main and one for the delayed time base. The trigger bar is a visual indicator of the trigger level. Trigger Point Indicator Trigger Bar—Long Style -or- Trigger Bar—Short Style Figure 3–15: Trigger Point and Level Indicators TDS 694C User Manual 3–25...
Page 79: Display Settings
NOTE. When the horizontal scale is set to the faster rates (2 ns/div for the TDS 694C) or when using the ZOOM feature to expand waveforms horizontally, interpolation occurs. (The filter type, linear or sin(x)/(x), depends on which is set in the Display menu.) Otherwise, interpolation is not used.
Page 80: Table 3-2: Xy Format Pairs
XY format is a dot-only display, although it can have persistence. The Vector style selection has no effect when you select XY format. You cannot display Math waveforms in XY format. They will disappear from the display when you select XY. TDS 694C User Manual 3–27...
Page 81 Acquiring and Displaying Waveforms Customizing the Display Color The TDS 694C Oscilloscopes can display information in different colors. This section describes how to use the Color menu to choose the colors in which the various display objects appear. Change the Display Color To bring up the Color menu: 1.
Page 82 Reset to Factory Color. 4. Choose Hue from the side menu and use the general purpose knob or keypad to select the desired hue. Values range from 0 to 359. Sample values are: TDS 694C User Manual 3–29...
Page 83 4. If you want the selected math waveform to be the same color as the waveform it is based on, select Color Matches Contents. If the math waveform is based on dual waveforms, the math waveform will use the color of the first constituent waveform. TDS 694C User Manual 3–30...
Page 84 1. Press the Options main menu item. 2. Toggle Collision Contrast to ON in the side menu to mark collision zones with a special color. Restore Colors To restore colors to their factory default settings: TDS 694C User Manual 3–31...
Page 85 Figure 3–19: Display Menu — Restore Colors Zooming on Waveforms The TDS 694C Oscilloscopes can expand or compress (zoom in or out) on a waveform without changing the acquisition parameters (sample rate, record length, and so on). This section describes how to use Zoom and how it interacts with the selected waveform.
Page 86 Toggle Dual Zoom to OFF in the side menu. 3. Adjust the vertical zoom factor for the selected waveform using the vertical SCALE knob. Adjust the vertical position of the zoomed waveform using the vertical POSITION knob. TDS 694C User Manual 3–33...
Page 87 NOTE. Although Zoom must be turned on to control which waveforms Zoom affects, the setting for Horizontal Lock affects which waveforms the horizontal control positions whether Zoom is on or off. The rules for the three settings are listed in step 4 on page 3–34. TDS 694C User Manual 3–34...
Page 88 (See Figure 3–21.) 2. To scale or position the unmagnified waveform, press Selected Grati- cule (main) Lower (side). Use the vertical and horizontal knobs to scale and position the unmagnified waveform in the box. TDS 694C User Manual 3–35...
Page 89 Dual zoom displays a second zoomed view of the selected unzoomed waveform. The second zoomed view is offset in time from the first zoomed view. Also, zoom must be enabled (side menu set to On or Preview) to see the Dual Zoom displays. TDS 694C User Manual 3–36...
Page 90 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 3–35. TDS 694C User Manual 3–37...
Page 91 Acquiring and Displaying Waveforms Selected Graticule Zoomed Waveform Edges Zoom Boxes Unzoomed Waveform Figure 3–22: Dual Zoom — Shown Dual Window (Preview) Mode TDS 694C User Manual 3–38...
Page 92 Triggering on Waveforms To use the TDS 694C Oscilloscopes to measure or monitor waveforms, you need to know how to trigger a stable display of those waveforms. Toward that end, this section first covers the following topics: H Trigger Concepts which details some basic principles of triggering and describes triggering elements: type, source, coupling, holdoff, mode, and so on.
Page 93 For example, you might want to trigger with an external clock, a logic analyzer or with a signal from another part of the circuit. To use the auxiliary trigger, connect the external triggering signal to the Auxiliary Trigger input connector on the oscilloscope rear panel. TDS 694C User Manual 3–40...
Page 94 Although the unsynced waveform may “roll” across the display, it will not freeze as it would in normal trigger mode. Monitoring of a power supply output is an example of such an application. TDS 694C User Manual 3–41...
Page 95 All trigger types except edge triggering use only DC coupling; edge triggering can use all available coupling types: AC, DC, Low Frequency Rejection, High Frequency Rejection, and Noise Rejection: See To Specify Coupling on page 3–49 for a description of each coupling mode. TDS 694C User Manual 3–42...
Page 96 (or both) after a main trigger event. See Delayed Triggering on page 3–80 to learn how to use delay. TDS 694C User Manual 3–43...
Page 97 Level if edge trigger or glitch or width pulse trigger is selected. Note that the MAIN LEVEL knob and menu items apply only to the main trigger level. To modify the delayed trigger level, use the Level item in the Delayed Trigger menu. TDS 694C User Manual 3–44...
Page 98 When the oscilloscope recognizes a delayed trigger, it will fill in the posttrigger portion of the delayed waveform. H When ARM, TRIG’D, and READY are all off, the digitizer is stopped. TDS 694C User Manual 3–45...
Page 99 Trigger Status Screen. To see a more comprehensive status listing of the settings for the main and delayed trigger systems, press SHIFT STATUS STA- TUS (main) Trigger (side). TDS 694C User Manual 3–46...
Page 100 Edge, Logic, or Pulse (pop-up). Triggering on a Waveform Edge The TDS 694C Oscilloscopes can trigger on an edge of a waveform. An edge trigger event occurs when the trigger source passes through a specified voltage level in a specified direction (the trigger slope). You will likely use edge triggering for most of your measurements.
Page 101 To bring up the Edge Trigger menu, press TRIGGER MENU Type (main) Edge (pop-up). (See Figure 3–30.) Figure 3–30: Main Trigger Menu — Edge Type TDS 694C User Manual 3–48...
Page 102 H In Normal mode the oscilloscope acquires a waveform only if there is a valid trigger. 2. To change the holdoff time, press Holdoff (side). Enter the value in time using the general purpose knob or the keypad. TDS 694C User Manual 3–49...
Page 103 1.2 V, which is smaller than the typical TTL (+1.4 V) or ECL (–1.3 V) level. Set to 50% fixes the trigger level to approximately 50% of the peak-to-peak value of the trigger source signal. TDS 694C User Manual 3–50...
Page 104 Triggering on Waveforms Triggering Based on Logic The TDS 694C Oscilloscopes 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 setup and hold times relative to a clock.
Page 105: Table 3-3: Pattern And State Logic
Setup/hold triggering uses the setup and hold times to define a “setup/hold violation zone” relative to the clock. Data that changes state within this zone triggers the oscilloscope. Figure 3–31 shows how the setup and hold times you choose positions this zone relative to the clock. TDS 694C User Manual 3–52...
Page 106 To quickly check if logic triggers are selected and if so, what class, check the Trigger Status Trigger readout. When logic triggers are selected, the trigger readout displays the selected logic trigger class: Pattern, State, or StHld (Setup/Hold). (See Fig- ure 3–32.) TDS 694C User Manual 3–53...
Page 107 Clock Level Clock Signal Setup/Hold Violation Zone –T Clock Level Clock Signal Setup/Hold Violation Zone –T Clock Level Clock Signal Positive T ; Negative T Negative T Positive T Figure 3–31: Violation Zones for Setup/Hold Triggering TDS 694C User Manual 3–54...
Page 108 (Pages 3–51 through 3–52 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). TDS 694C User Manual 3–55...
Page 109 Type (main) Logic (pop-up) 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. TDS 694C User Manual 3–56...
Page 110 (TRUE) for less than the time you specify. Conversely, the TRUE for more than menu item requires the boolean function to be TRUE for longer than the time you specify. TDS 694C User Manual 3–57...
Page 111 TRUE for 150 ms. Time Logic Function is TRUE Logic Function (AND) Becomes TRUE Logic Function Becomes FALSE and Triggers Acquisition Time Logic Function Must be TRUE Figure 3–34: Logic Trigger Menu — Time Qualified TRUE TDS 694C User Manual 3–58...
Page 112 Set Trigger When. To choose to trigger when the logic condition is met (Goes TRUE) or when the logic condition is not met (Goes FALSE): Press TRIGGER MENU Type (main) Logic (pop-up) Class (main) State (pop-up) Trigger When (main) Goes TRUE or Goes FALSE (side). TDS 694C User Manual 3–59...
Page 113 2. Press any one of Ch1, Ch2, Ch3, or Ch4 (side). Do not select the same channel that you selected for the clock source. 3. Press Clock Edge (side) to toggle between the rising and falling edges. TDS 694C User Manual 3–60...
Page 114 Setup time always leads the hold time by at least 2 ns 2 ns). Attempting to set either time to reduce the 2 ns limit adjusts the other time to maintain the limit. TDS 694C User Manual 3–61...
Page 115 Trigger Modes and Trigger Holdoff on page 3–41. Advanced Logic This feature provides the ability to cross trigger a TDS 694C oscilloscope with Triggering with a TLA the system Trigger Out signal from a TLA Series Logic Analyzer. For precise...
Page 116 500 ps resolution. If a problem is suspected on any four of the signals, the TDS 694C can be used to zero in on the problem and provide even more timing resolution, less than 15 ps.
Page 117 BNC connector. Connect a coaxial cable to the BNC connector, then connect the remaining BNC cable connector to the Aux Trigger Input located on the rear panel of the TDS 694C. See Figure 3–37. TLA 714 Logic Analyzer Trig Out Signal...
Page 118 TDS 694C probe to a signal on their prototype that is also probed by the TLA Logic Analyzer. The signal used should have an event that is uniquely recogniz- able within a 1 ms interval.
Page 119 NOTE. The TLA Logic Analyzer should now be repetitively triggering on the rising edge of the signal and sending a trigger to the TDS 694C. The rising edge of the signal should be displayed some where on the TDS 694C screen.
Page 120 Triggering on Waveforms Triggering on Pulses The TDS 694C Oscilloscopes can trigger on glitch or runt pulses, or it can trigger based on the width, slew rate, or timeout period of a pulse. These capabilities make 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.
Page 121: Table 3-4: Pulse Trigger Definitions
Width negative Triggering occurs if the oscilloscope finds a negative pulse with a width between, or optionally outside, the user-speci- fied lower and upper time limits. TDS 694C User Manual 3–68...
Page 122 When you select the pulse class Glitch, the oscilloscope will trigger on a pulse narrower (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). TDS 694C User Manual 3–69...
Page 123 Positive, Negative, or Either (side). Positive looks at positive-going pulses. Negative looks at negative-going pulses. Either looks at both positive and negative pulses. 2. Press Width (side), and set the glitch width using the general purpose knob or keypad. TDS 694C User Manual 3–70...
Page 124 To set up for runt triggering, do the following procedures. Select Runt Triggering. Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Runt (pop-up). (See Figure 3–40.) TDS 694C User Manual 3–71...
Page 125 2. Use the general purpose knob or keypad to set the values for the high and low thresholds. Hint: To use the Trigger Bar feature to set the threshold levels on the pulse train, press DISPLAY Readout Options (main) Trigger Bar Style (side) until Long appears in that menu item. TDS 694C User Manual 3–72...
Page 126 For all three polarity settings, triggering occurs at the point the runt pulse recrosses its first threshold. TDS 694C User Manual 3–73...
Page 127 2. Press Within Limits (side) if you want the oscilloscope to trigger on pulses that fall within the specified range. If you want it to trigger on pulses that are outside the range, then press Out of Limits (side). TDS 694C User Manual 3–74...
Page 128 Slew Rate (pop-up) Polarity (main) Positive, Negative, or Either (side). Positive monitors the slew rate of the positive-going edges of pulses. The edge must first cross the lower threshold and then cross the upper threshold. TDS 694C User Manual 3–75...
Page 129 This readout varies as you vary the Delta Time setting this side menu and as you vary either of the threshold settings from the Thresholds menu. You adjust those parameters to adjust slew rate; you can’t adjust slew rate directly. TDS 694C User Manual 3–76...
Page 130 Ch 1. It is set to monitor the positive-polarity pulse edges of the trigger source and to trigger on any edge with a slew rate faster than the slew rate setting. TDS 694C User Manual 3–77...
Page 131 4 V and a delta time of 200 ns between the threshold levels. Therefore, the slew rate of the pulse edge triggered on is: Slew Rate Measured + dv + 4 Volts + 20 mV ns 200 ns TDS 694C User Manual 3–78...
Page 132 Stays High causes a trigger to occur if the signal stays higher than the trigger level for longer than the timeout value. Stays Low causes a trigger to occur if the signal stays lower than the trigger level for longer than the timeout value. TDS 694C User Manual 3–79...
Page 133 Trigger Holdoff on page 3–41. Delayed Triggering The TDS 694C Oscilloscopes provides a main time base and a delayed time base. The delayed time base, like the main time base, requires a trigger signal and an input source dedicated to that signal. You can only use delay with respect to the main edge trigger and certain classes of main pulse triggers.
Page 134 Logic, any class, or when the main trigger type is Pulse with Runt or Slew Rate classes selected. For these settings, the oscilloscope will force the delayed time base to be in Runs After mode. TDS 694C User Manual 3–81...
Page 135 Pulse as fits your application. Logic type is incompatible with Delayed Triggerable. 3. If Source is set to Auxiliary, press Source (main). Select any source other than Auxiliary from the side menu according to your application. TDS 694C User Manual 3–82...
Page 136 Delayed Trigger Waveform Record 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 3–44: How the Delayed Triggers Work TDS 694C User Manual 3–83...
Page 137 Delayed Triggerable in the Horizontal menu. You will still need to display the Horizontal menu if you want to leave Delayed Triggerable. The Source menu lets you select which input will be the delayed trigger source. TDS 694C User Manual 3–84...
Page 138 When using Delayed Triggerable mode to acquire waveforms, two trigger bars are displayed. One trigger bar indicates the level set by the main trigger system; the other indicates the level set by the delayed trigger system. TDS 694C User Manual 3–85...
Page 139 Some combinations of vertical scale, offset, and position result in a trigger range that prevents Set to TTL or Set to ECL from achieving their desired settings. In this case, the trigger level is set as close as possible to the desired setting. TDS 694C User Manual 3–86...
Page 140 Measuring Waveforms To make the best use of the TDS 694C Oscilloscopes when taking measure- ments, you need to know how to use the five types, or classes, of measurements it can take. This section describes how to take the following classes of measure- ments (Figure 3–46 shows four measurement classes):...
Page 141: Table 3-5: Measurement Definitions
Measuring Waveforms Taking Automated Measurements The TDS 694C Oscilloscopes provides the feature Measure for automatically taking and displaying waveform measurements. This section describes how to set up the oscilloscope to let it do the work of taking measurements for you.
Page 142 Timing measurement of the first pulse in the waveform or gated region. The distance (time) between MidRef (default 50%) amplitude points of a negative pulse. Peak to Peak Voltage measurement. The absolute difference between the maximum and minimum amplitude in the entire waveform or gated region. TDS 694C User Manual 3–89...
Page 143 Measurement 1 is the top readout, Measurement 2 is below it, and so forth. Once a measurement readout is displayed in the screen area, it stays in its position even when you remove any measurement readouts above it. TDS 694C User Manual 3–90...
Page 144 H Be careful when taking automatic measurements on noisy signals. You might measure the frequency of the noise and not the desired waveform. Your oscilloscope helps identify such situations by displaying a low signal amplitude or low resolution warning message. TDS 694C User Manual 3–91...
Page 145 All Measurements (side). Gate Measurements The gating feature lets you limit measurements to a specified portion of the waveform. When gating is Off, the oscilloscope makes measurements over the entire waveform record. TDS 694C User Manual 3–92...
Page 146 Displaying the cursor menu and turning V Bar cursors off will not turn gating off. (Gating arrows remain on screen to indicate the area over which the measurement is gated.) You must turn gating off in the Gating side menu. TDS 694C User Manual 3–93...
Page 147 Units helps you set precise values. For example, if your are measuring specifications on an RS-232-C circuit, set the levels precisely to RS-232-C specification voltage values by defining the high and low references in units. TDS 694C User Manual 3–94...
Page 148 Delay (side) Delay To (main) Measure Delay to. 2. Press Measure Delay to (side) repeatedly to choose the delay to waveform. The choices are Ch1, Ch2, Ch3, Ch4, Math1, Math2, Math3,Ref1, Ref2, Ref3, and Ref4. TDS 694C User Manual 3–95...
Page 149 4. To take the measurement you just specified, press Delay To (main) Create Measurement (side). To exit the Measure Delay menu rather than creating a delay measurement, press CLEAR MENU, which returns you to the Measure menu. TDS 694C User Manual 3–96...
Page 150 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. Snapshot Display Figure 3–52: Snapshot Menu and Readout TDS 694C User Manual 3–97...
Page 151 Appendix B: Algorithms on page B–1. Taking Cursor Measurements The TDS 694C Oscilloscopes provides cursors that measure the difference (either in time or voltage) between two locations in a waveform record. This section describes cursors — how to select their type and mode, how to display them, and how to use them to take measurements.
Page 152 There are two cursor modes: independent and tracking. (See Figure 3–54.) In independent mode, you move only one cursor at a time using the general purpose knob. The active, or selected, cursor is a solid line. Press SELECT to change which cursor is selected. TDS 694C User Manual 3–99...
Page 153 V Bars. The value after D shows the time (or frequency) difference between the cursors. 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. TDS 694C User Manual 3–100...
Page 154 To select the type of cursors you want, do the following steps: 1. To display the cursor menu, press CURSOR. (See Figure 3–55.) 2. Press Function (main) H Bars, V Bars, Paired, or Off (side). TDS 694C User Manual 3–101...
Page 155 H To adjust either cursor in independent mode, use the general purpose knob to move the selected (active) cursor. A solid line indicates the adjustable cursor and a dashed line the fixed cursor. Press Select to toggle selection between the two cursors. TDS 694C User Manual 3–102...
Page 156 3–153, Waveform Differentiation on page 3–172, and Waveform Integration on page 3–177. Taking Graticule Measurements The TDS 694C Oscilloscopes provides a graticule for measuring the difference (either in time or amplitude) between two points on a waveform record. Graticule measurements provide you with quick, visual estimates. For example, you might look at a waveform amplitude and say “it is a little more than...
Page 157 5 divisions Displaying Histograms The TDS 694C Oscilloscopes can display histograms constructed from the selected trace waveform data. You can display either a vertical or horizontal histogram. You can display only one type of histogram at a time. See Fig- ure 3–57.
Page 158 The size of the max bin is controlled by the Histogram Size side menu. Reset Histogram Counting To reset the count in all histogram bins to zero, press MEASURE Histogram (pop-up) Histogram Options (main) Reset Histogram Counting (side). TDS 694C User Manual 3–105...
Page 159 Measure (main) Histogram (pop-up) Histogram Box Limits (main). Then toggle Move Box (side) to Horizontal or Vertical and use the general purpose knob to move the histogram box. (The SELECT button will also toggle Move Box.) TDS 694C User Manual 3–106...
Page 160 Measuring Waveforms Histogram Measurement The TDS 694C Oscilloscope provides you with 10 histogram measurements. List Table 3–6 lists brief definitions of the measurements. Table 3–6: Measurement definitions Name Definition Mean The average of all acquired points within (or on) the histogram box.
Page 161 This section tells you how to use both features. Signal Path The TDS 694C Oscilloscopes lets you compensate the internal signal path used Compensation to acquire the waveforms you measure. SPC optimizes the oscilloscope capability to make accurate measurements based on the ambient temperature.
Page 162 Set to 0 S (side). Probe Cal The TDS 694C Oscilloscopes lets you compensate the probe, based on the channel it is connected to, to improve the gain and offset accuracy of the probe.
Page 163 PROBE COMPENSATION GND. 9. Press OK Compensate Gain (side). 10. Wait for gain compensation to complete (one to three minutes). When gain compensation completes, the following actions occur: H The clock icon will disappear. TDS 694C User Manual 3–110...
Page 164 13. Press SHIFT UTILITY System (main) Diag/Err (pop-up) Error Log (main). If there are too many error messages to be seen on screen, rotate the general purpose knob clockwise to scroll to the last message. TDS 694C User Manual 3–111...
Page 165 If it is, the oscilloscope sets status to pass; if not, it sets the status to Initialized. TDS 694C User Manual 3–112...
Page 166 H Press OK Erase Probe Cal Data (side) to erase the Probe Cal data last stored and use the probe uncompensated. H Press CLEAR MENU on the front panel to retain the Probe Cal data last stored and use the probe uncompensated. Figure 3–60: Re-use Probe Calibration Data Menu TDS 694C User Manual 3–113...
Page 167: Table 3-7: Probe Cal Status
Some optical probes and most active probes (such as the P6249) have TEKPROBE interfaces. TDS 694C User Manual 3–114...
Page 168 NOTE. TDS Oscilloscopes do not come equipped with a hard disk drive. Saving and Recalling Setups The TDS 694C Oscilloscopes can store up to ten instrument setups in internal memory that you may later recall. This section describes how you save and recall a setup, and how you can recall the factory default setup.
Page 169 3. To store a setup to disk, press To File (side). Then use the general purpose knob to select the exact file from the resulting scrollbar list. Finally, press Save To Selected File (side) to complete the operation. TDS 694C User Manual 3–116...
Page 170 To use Tek Secure to remove all reference setups and waveforms (does not affect mass storage disks): Press SHIFT UTILITY System (main) Config (pop-up) Tek Secure Erase Memory (main) OK Erase Setup & Ref Memory (side). TDS 694C User Manual 3–117...
Page 171 See Example 4: Saving Setups, on page 2–26. Saving and Recalling Waveforms and Acquisitions TDS 694C Oscilloscopes provides four internal reference memories in any of which you can store a waveform. Waveforms thus stored are retained even when you turn the oscilloscope off or unplug it. The oscilloscope also can save waveforms to disk.
Page 172 2. To store a waveform internally, press SAVE/RECALL WAVEFORM Save Wfm (main) To Ref1, To Ref2, To Ref3, or To Ref4 (side). Figure 3–62: Save Waveform Menu TDS 694C User Manual 3–119...
Page 173 Also note that the delimiters are carriage returns. To Delete Waveforms To delete a reference waveform(s) that you no longer need: Press SAVE/RECALL WAVEFORM Delete Refs (main) Delete Ref1, Delete Ref2, Delete Ref3, Delete Ref4, or Delete All Refs (side). TDS 694C User Manual 3–120...
Page 174 More main menu. Figure 3–63: More Menu To Recall a Waveform To recall a waveform from disk to an internal reference memory: From Disk Press SAVE/RECALL WAVEFORM Recall Wfm To Ref (main) Recall From File (side). TDS 694C User Manual 3–121...
Page 175 To run file utilities, see the Managing the File System on page 3–122. Managing the File System The TDS 694C Oscilloscopes provides file utilities and a floppy disk drive (and optional hard disk) for saving hardcopies, setups, and waveforms. This section describes how to manage (delete, rename, etc.) these files using the file system.
Page 176 1 Mbyte or more). To convert the amount to bytes, you simply multiply the Kbytes amount times 1024. Thus, the 690 Kbytes shown in Figure 3–64 = 690 Kbytes x 1024 bytes/Kbyte = 706,560 bytes. Figure 3–64: File Utilities TDS 694C User Manual 3–123...
Page 177 Press Enter Char from the main menu to enter each letter. When you have entered the name, press the side menu OK Accept item. Figure 3–65: File System — Labeling Menu TDS 694C User Manual 3–124...
Page 178 When the confirm delete option is OFF, the oscilloscope can immediately delete files or directories. When the confirm option is ON, the oscilloscope warns you before it deletes files and gives you a chance to reconsider TDS 694C User Manual 3–125...
Page 179 2–5). 4. Power up the Zip drive either immediately after or at the same time the oscilloscope is powered up. Do not power up the Zip drive first. TDS 694C User Manual 3–126...
Page 180 See Printing a Hardcopy, on page 3–127. Printing a Hardcopy The TDS 694C Oscilloscopes can provide you with hardcopies of its display. To obtain a hardcopy, you need to know how to configure the communication and hardcopy parameters of the oscilloscope, how to connect it to one of the many hardcopy devices it supports, and how to print the hardcopy.
Page 181 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. To Set Up for Making...
Page 182 When using these formats, be careful not to inadvertently abort the print by pressing the Hardcopy button for a second print before the oscilloscope has finished processing and transmitting the first one. TDS 694C User Manual 3–129...
Page 183 (See Figure 3–68.) (The date and time are removed from the display when menus are displayed.) 4. Once the oscilloscope is connected to a hardcopy device, press HARDCOPY to print your date/time stamped hardcopy. TDS 694C User Manual 3–130...
Page 184 For example, use 23.6 for the 23 of June.) 3. Repeat steps 1 and 2 to set other parameters as desired. 4. Press OK Enter Date/Time (side) to put the new settings into effect. This sets the seconds to zero. TDS 694C User Manual 3–131...
Page 185 Centronics Cable Figure 3–69: Connecting the Oscilloscope Directly to the Hardcopy Device 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 186 The size of the spool is, therefore, variable. The number of hardco- pies that can be spooled depends on three variables: H The amount of unused RAM H The hardcopy format chosen H The complexity of the display TDS 694C User Manual 3–133...
Page 187 Saving files to the 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. Or you might load stored hardcopies from disk into your desktop publishing software that runs on a PC-compatible computer. TDS 694C User Manual 3–134...
Page 188 GPIB Cable Connecting the Oscilloscope and Hardcopy Device Via a PC Figure 3–70: Print. If your controller is PC-compatible and it uses the Tektronix GURUT or S3FG210 (National Instruments GPIB-PCII/IIA) GPIB package, do the following steps to print a hardcopy: 1.
Page 189 “copy screen1 lpt1: /B”. Your hardcopy device should now print a picture of the oscilloscope screen. NOTE. If you transmit hardcopy files across a computer network, use a binary (8-bit) data path. TDS 694C User Manual 3–136...
Page 190 Saving Waveforms and Setups Communicating with Remote Instruments The TDS 694C Oscilloscopes can connect into a system environment, so that you can control it remotely or exchange measurement or waveform data between it and a computer. This subsection explains how to prepare and setup the oscilloscope for control and operation over the IEEE Std 488.2-1987 (GPIB)
Page 191 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 192 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. TDS 694C User Manual 3–139...
Page 193 Saving Waveforms and Setups GPIB Configuration Menu Figure 3–74: Utility Menu To Find More Information See Printing a Hardcopy, on page 3–127. See the TDS Programmer Manual disk. TDS 694C User Manual 3–140...
Page 194 Determining Status and Accessing Help The TDS 694C Oscilloscopes can display the status of its internal systems. It also provides an on-line help system. This section describes how to use the following two features: H Status which displays a snapshot of system, display, trigger, waveform, and...
Page 195 Determining Status and Accessing Help Firmware Version Figure 3–75: Status Menu — System TDS 694C User Manual 3–142...
Page 196 Banner (main). (See Figure 3–76.) Figure 3–76: Banner Display Displaying Help To use the on-line help system: Press HELP to provide on-screen information on any front panel button, knob or menu item. (See Figure 3–77.) TDS 694C User Manual 3–143...
Page 197 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. TDS 694C User Manual 3–144...
Page 198 Using Features for Advanced Applications The TDS 694C Oscilloscopes provides powerful features for testing and digitally processing the waveforms you acquire. This section describes how to use the fol- lowing features: H Limit Testing — for testing the waveforms you acquire against a template you create (on this page) H Waveform Math —...
Page 199 Average acquisition mode. If you are unsure how to select Average, see Selecting an Acquisition Mode on page 3–20. 3. Once you have selected a source, select a destination for the template: press Template Destination (side) Ref1, Ref2, Ref3, or Ref4. TDS 694C User Manual 3–146...
Page 200 Until you have done so, the template waveform has been defined but not created. To avoid overwriting the template you have just created, store any new template you create in a different destination from that just stored. TDS 694C User Manual 3–147...
Page 201 Now specify the action to take if waveform data exceeds the limits set by the Response limit test template and turn on limit testing: 1. Press SHIFT ACQUIRE MENU Limit Test Setup (main) to bring up a side menu of possible actions. TDS 694C User Manual 3–148...
Page 202 H The waveform will be repositioned horizontally to move the first sample in the waveform record that is outside of template limits to center screen. H The position of the waveform template will track that of the waveform. TDS 694C User Manual 3–149...
Page 203 CH 2 is higher than CH 1. Waveform Math The TDS 694C Oscilloscopes provides a means for you to mathematically manipulate your waveforms. For example, you might have a waveform clouded by background noise. You can obtain a cleaner waveform by subtracting the background noise from your original waveform.
Page 204 3. Press Set Function to (side) repeatedly to cycle it to inv (invert), intg, or diff. Waveform integration (intg) is described on page 3–177, and waveform differentiation (diff) is described on page 3–172. 4. To create the math waveform, press OK Create Math Wfm (side). TDS 694C User Manual 3–151...
Page 205 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 3–81: Dual Waveform Math Main and Side Menus TDS 694C User Manual 3–152...
Page 206 Fast Fourier Transforms The Advanced DSP Math capabilities of the TDS 694C Oscilloscopes include taking the Fast Fourier Transform (FFT) of a waveform. This section describes FFTs and how to set up the oscilloscope to display and measure FFTs.
Page 207 DSP allows the oscilloscope to compute FFTs of source waveforms that must be acquired based on a single trigger, making it useful for measuring the frequency content of single events. DSP also allows the phase as well as the magnitude to be displayed. TDS 694C User Manual 3–154...
Page 208 5. If the selected math waveform is not FFT, press Change Math Definition (side) FFT (main). See Figure 3–83. 6. Press Set FFT Source to (side) repeatedly until the channel source selected in step 1 appears in the menu label. TDS 694C User Manual 3–155...
Page 209 Phase (rad) — Phase is displayed using radians as the scale, where radians wrap from –p to +p. The topic Considerations for Phase Displays, on page 3–166, provides in depth information on setup for phase displays. TDS 694C User Manual 3–156...
Page 210 The topic Adjust Phase Suppression, on page 3–167, provides additional information on phase suppression. 12. Press OK Create Math Wfm (side) to display the FFT of the waveform you input in step 1. (See Figure 3–84.) TDS 694C User Manual 3–157...
Page 211 (0 volts), or the zero phase level (0 degrees or 0 radians) from the @: readout. (The waveform reference indicator at the left side of the graticule indicates the level where phase is zero for phase FFTs.) TDS 694C User Manual 3–158...
Page 212 7. Press SELECT to select the alternate cursor. 8. Align the selected cursor to another point of interest on the math waveform. TDS 694C User Manual 3–159...
Page 213 FFT frequency domain record. This frequency domain record is derived from the FFT time domain record, which is derived from the waveform record. All three records are described below. TDS 694C User Manual 3–160...
Page 214 FFT Time Domain Record = Waveform Record Waveform Record 10 K Zero Phase Reference FFT Time Domain Record = 10k Waveform Record > 10 K Zero Phase Reference Figure 3–86: Waveform Record vs. FFT Time Domain Record TDS 694C User Manual 3–161...
Page 215 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. TDS 694C User Manual 3–162...
Page 216 However, long record lengths lower the noise relative to the signal and increase the frequency resolution for the FFT. More important, they might be needed to capture the waveform feature you want to include in the FFT. TDS 694C User Manual 3–163...
Page 217 SCALE knobs to adjust the math waveform size.) 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. TDS 694C User Manual 3–164...
Page 218 These harmonics typically decrease in amplitude as their frequency increases. H Sample the source signal at rates that are at least 2X that of the highest frequency component having significant amplitude. TDS 694C User Manual 3–165...
Page 219 The zero reference point is the point at the center of the FFT math waveform but corresponds to various points on the source (time domain) record. (See Figure 3–86 on page 3–161.) TDS 694C User Manual 3–166...
Page 220 Adjust Phase Suppression. Your source waveform record may have a noise component with phase angles that randomly vary from −pi to pi. This noise could make the phase display unusable. In such a case, use phase suppression to control the noise. TDS 694C User Manual 3–167...
Page 221 Windowing Process. The oscilloscope multiplies the FFT time domain record by one of four FFT windows before it inputs the record to the FFT function. Figure 3–89 shows how the time domain record is processed. TDS 694C User Manual 3–168...
Page 222 FFT, better amplitude accuracy over frequency resolution, or to provide a compromise between both. You can choose from these four windows: Rectangular, Hamming, Hanning, and Blackman-Harris. TDS 694C User Manual 3–169...
Page 223 H The lower the lobes on the side of each central lobe are, the better the amplitude accuracy of the frequency measured in the FFT using that window. H Narrow lobes increase frequency resolution because they are more selective. Lower side lobe amplitudes increase accuracy because they reduce leakage. TDS 694C User Manual 3–170...
Page 224 Care should be taken when using bell shaped windows to be sure that the most interesting parts of the signal in the time domain record are positioned in the center region of the window so that the tapering does not cause severe errors. TDS 694C User Manual 3–171...
Page 225 Figure 3–90: FFT Windows and Bandpass Characteristics Waveform Differentiation The Advanced DSP Math capabilities of the TDS 694C Oscilloscopes include waveform differentiation. This capability allows you to display a derivative math waveform that indicates the instantaneous rate of change of the waveform acquired.
Page 226 6. Press OK Create Math Wfm (side) to display the derivative of the waveform you input in step 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. TDS 694C User Manual 3–173...
Page 227 To Take Cursor Measurements on page 3–179. When using that procedure, note that the amplitude measurements on a derivative waveform will be in volts per second rather than in volt-seconds as is indicated for the integral waveform measured in the procedure. TDS 694C User Manual 3–174...
Page 228 The vertical position and vertical offset will not affect your derivative waveform unless you position the source waveform off screen so it is clipped. H When using the vertical scale knob to scale the source waveform, note that it also scales your derivative waveform. TDS 694C User Manual 3–175...
Page 229 Horizontal SCALE knob to adjust the math waveform size.) 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. TDS 694C User Manual 3–176...
Page 230 Reset All Factors (side) to return the zoomed derivative waveform to no magnification. Waveform Integration The Advanced DSP Math capabilities of the TDS 694C Oscilloscopes include waveform integration. This capability allows you to display an integral math waveform that is an integrated version of the acquired waveform. This section describes how to setup the oscilloscope to display and measure integral math waveforms.
Page 231 6. Press OK Create Math Waveform (side) to turn on the integral math waveform. You should now have your integral math waveform on screen. See Fig- ure 3–93. Use the Vertical SCALE and POSITION knobs to size and position your waveform as you require. TDS 694C User Manual 3–178...
Page 232 6. Read the integrated voltage over time between the cursors in volt-seconds from the D: readout. Read the integrated voltage over time between the selected cursor and the reference indicator of the math waveform from the @: readout. (See Figure 3–94.) TDS 694C User Manual 3–179...
Page 233 @: readout. 11. Press Function (main) Paired (side). 12. Use the technique just outlined to place the long vertical bar of each paired cursor to the points along the horizontal axis you are interested in. TDS 694C User Manual 3–180...
Page 234 The oscilloscope integrates this offset along with the time varying portions of your waveform. Even a few divisions of offset in the source waveform may be enough to ensure that the integral waveform saturates (clips), especially with long record lengths. TDS 694C User Manual 3–181...
Page 235 On (side). The vertical and horizontal zoom factors appear on screen. Whether Zoom is on or off, you can press Reset (main) Reset Live Factors or Reset All Factors (side) to return the zoomed integral waveform to no magnification. TDS 694C User Manual 3–182...
Page 236 Appendices...
Page 237: Table A-1: Options
Appendix A: Options and Accessories This appendix describes the various options as well as the standard and optional accessories that are available for the TDS 694C Oscilloscope. Options Tektronix will ship the options shown in Table A–1: Table A–1: Options...
Page 238: Table A-2: Standard Accessories
Optional Accessories You can also order the optional accessories listed in Table A–3. Table A–3: Optional accessories Accessory Part number Service Manual 071-0495-XX Oscilloscope Cart K420 Rack Mount Kit (for field conversion) 016-1236-00 Accessory Pouch 016-1268-00 TDS 694C User Manual A–2...
Page 239: Table A-4: Recommended Probe Cross Reference
Active >3.5V Logic P6245 Active CMOS/TTL P6245 All Technology P6245 Differential Digital/ P6246 Telecom P6248 Micro Volt ADA400A High Voltage P5210 Current CT-1 AC Only CT-2 CT-6 Current TCP202 AC/DC AM503S Electro-Optical Converter P6701B P6703B TDS 694C User Manual A–3...
Page 240 Appendix A: Options and Accessories NOTE. The TDS 694C oscilloscope does not have a 1MW input impedance, therefore many passive, high voltage, and current probes will not work correctly. Use probes with 50W output impedance only. Accessory Probes The following optional accessory probes are recommended for use with your TDS 694C: H P6245 Active, high speed digital voltage probe.
Page 241: Table A-5: Accessory Software
Appendix A: Options and Accessories Accessory Software The optional accessories listed in Table A–5 are Tektronix software products recommended for use with your oscilloscope. Table A–5: Accessory software Software Part number Wavewriter: AWG and waveform creation S3FT400 WaveStarT: Waveform capture and documentation...
Page 242 Appendix A: Options and Accessories TDS 694C User Manual A–6...
Page 243 Appendix B: Algorithms The TDS 694C Oscilloscopes can take 25 automatic measurements. By knowing how it makes these calculations, you may better understand how to use your oscilloscope and how to interpret your results. Measurement Variables The oscilloscope uses a variety of variables in its calculations. These include:...
Page 244 Typically set to 90%. You can set it from 0% to 100% or to a voltage level. MidRef — the waveform middle reference level. Typically set to 50%. You can set it from 0% to 100% or to a voltage level. TDS 694C User Manual B–2...
Page 245 Similarly, after a positive MidRef crossing, waveform data must go above 10% of the amplitude before a negative crossing can be measured. Hysteresis is useful when you are measuring noisy signals, because it allows the oscilloscope to ignore minor fluctuations in the signal. TDS 694C User Manual B–3...
Page 246 3. Continuing from MCross2, find the next MidRefCrossing in the waveform record (or the gated region) of the same polarity as MCross1. This is MCross3. MCross1Polarity — is the polarity of first crossing (no default). It can be rising or falling. TDS 694C User Manual B–4...
Page 247 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 (TPOS+TSOFF). TDS 694C User Manual B–5...
Page 248 Amplitude (voltage) measurement. The area over one waveform cycle. For data not cyclical, you might prefer to use the Area measurement. If StartCycle = EndCycle then return the (interpolated) value at StartCycle. EndCycle Waveform(t)dt CycleMean= StartCycle For details of the integration algorithm, see page B–15. TDS 694C User Manual B–6...
Page 249 The true Root Mean Square voltage over one cycle. If StartCycle = EndCycle then CycleRMS = Waveform[Start]. Otherwise, EndCycle (Waveform(t)) CycleRMS = StartCycle (EndCycle * StartCycle) SampleInterval For details of the integration algorithm, see page B–15. TDS 694C User Manual B–7...
Page 250 1. Searching from Start to End, find the first sample in the measurement zone greater than HighRef. 2. From this sample, continue the search to find the first (negative) crossing of HighRef. The time of this crossing is THF. (Use linear interpolation if necessary.) TDS 694C User Manual B–8...
Page 251 1 Hz = 1 cycle per second. If Period = 0 or is otherwise bad, return an error. Frequency = 1/Period High 100% (highest) voltage reference value. (See High, Low on page B–1.) Using the min-max measurement technique: High = Max TDS 694C User Manual B–9...
Page 252 Minimum Amplitude (voltage) measurement. The minimum amplitude. Typically the most negative peak voltage. Examine all Waveform[ ] samples from Start to End inclusive, and set Min equal to the smallest magnitude Waveform[ ] value found. TDS 694C User Manual B–10...
Page 253 NegativeWidth = (MCross2 – MCross1) else NegativeWidth = (MCross3 – MCross2) Waveform[Start] Optical Power See Mean dBm on page B–10. Peak to Peak Amplitude measurement. The absolute difference between the maximum and minimum amplitude. PeaktoPeak = Max – Min TDS 694C User Manual B–11...
Page 254 4. The phase is determined by the following: MCross1Ref * MCross1Target Phase = Period If the target waveform leads the reference waveform, phase is positive; if it lags, negative. Phase is not available in the Snapshot display. TDS 694C User Manual B–12...
Page 255 LowRef. 2. From this sample, continue the search to find the first (positive) crossing of LowRef. The time of this crossing is the low rise time or TLR. (Use linear interpolation if necessary.) TDS 694C User Manual B–13...
Page 256 Amplitude (voltage) measurement. The true Root Mean Square voltage. If Start = End then RMS = the (interpolated) value at Waveform[Start]. Otherwise, (Waveform(t)) RMS = Start (End * Start) SampleInterval For details of the integration algorithm, see below. TDS 694C User Manual B–14...
Page 257 A and B are numbers between 0.0 and RecordLength–1.0 If A and B are integers, then: ) W(i) W(i ) 1) ) ( W(i ) 1) ) ( W(i) ) dt + s where s is the sample interval. TDS 694C User Manual B–15...
Page 258 MidRef Both min and max samples are above 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 TDS 694C User Manual B–16...
Page 259 NOTE. When measurements are displayed using Snapshot, out of range warnings are 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. TDS 694C User Manual B–17...
Page 260 Appendix B: Algorithms TDS 694C User Manual B–18...
Page 261 Appendix C: Packaging for Shipment If you ship the TDS 694C Oscilloscopes, pack it in the original shipping carton and packing material. If the original packing material is not available, package the instrument as follows: 1. Obtain a corrugated cardboard shipping carton with inside dimensions at least 15 cm (6 in) taller, wider, and deeper than the oscilloscope.
Page 262 Appendix C: Packaging for Shipment TDS 694C User Manual C–2...
Page 263 TDS 694C. The P6339A probe will provide the same 10 MW performance as other high input resistance probes. NOTE. Most passive probes require the input impedance of the oscilloscope to be 1 MW. The TDS 694C is 50 W only and will not work with these probes. TDS 694C User Manual D–1...
Page 264 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). TDS 694C User Manual D–2...
Page 265 Active voltage measuring probes use active circuit elements in the probe design to process signals from the circuit under test. All active probes require a source of power for their operation. Power is obtained either from an external power supply or from the oscilloscope itself. TDS 694C User Manual D–3...
Page 266 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 2 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 267 (LANs), fiber-based systems based on the FDDI, SONET, and Fiber Channel standards, optical disk devices, digital video, and high-speed fiber optic communications systems. TDS 694C User Manual D–5...
Page 268 Appendix D: Probe Selection TDS 694C User Manual D–6...
Page 269 Appendix E: Inspection and Cleaning Inspect for dirt and damage on and clean the exterior of the TDS 694C Oscillo- scopes. When done regularly, this preventive maintenance may prevent oscilloscope malfunction and enhance its reliability. How often to do this preventive maintenance depends on the severity of the environment in which the oscilloscope is used.
Page 270: Table E-1: External Inspection Check List
CAUTION. To prevent getting moisture inside the oscilloscope during external cleaning, use only enough liquid to dampen the cloth or applicator. Lubrication. There is no periodic lubrication required for this oscilloscope. TDS 694C User Manual E–2...
Page 271 H Select Start, Programs, and then click the TDS694C Digital Real-Time Programmer Manual. H If you have not created a Windows 95 shortcut, use the File Manager Explorer (Windows 95) to select and run the TDS–pgm.hlp program. TDS 694C User Manual F–1...
Page 272 Appendix F: Programmer Disk TDS 694C User Manual F–2...
Page 274 The waveform displayed on the oscilloscope may have a lower frequency than the actual input signal. Amplitude The High waveform value less the Low waveform value. TDS 694C User Manual Glossary–1...
Page 275 3 dB ( .707) attenuation of the original (reference) signal. Burst width A timing measurement of the duration of a burst. Channel One type of input used for signal acquisition. The oscilloscope has four channels. TDS 694C User Manual Glossary–2...
Page 276 Available for both the trigger system and the vertical system. Delay measurement A measurement of the time between the middle reference crossings of two different waveforms. Delay time The time between the trigger event and the acquisition of data. TDS 694C User Manual Glossary–3...
Page 277 The ratio of High optical power to Low optical power. Fall time A measurement of the time it takes for the trailing edge of a pulse to fall from a HighRef value (typically 90%) to a LowRef value (typically 10%) of its amplitude. TDS 694C User Manual Glossary–4...
Page 278 With the min/max method (most useful for general waveforms), it is the maximum value found. With the histogram method (most useful for pulses), it refers to the most common value found above the mid point. See Appendix B: Algorithms for details. TDS 694C User Manual Glossary–5...
Page 279 With the min/max method (most useful for general waveforms), it is the minimum value found. With the histogram method (most useful for pulses), it refers to the most common value found below the mid point. See Appendix B: Algorithms for details. TDS 694C User Manual Glossary–6...
Page 280 A logic (Boolean) function in which the output of the OR function is complemented (true becomes false, and false becomes true). On the oscilloscope, that is a trigger logic pattern and state function. TDS 694C User Manual Glossary–7...
Page 281 Positive duty cycle A timing measurement of the ratio of the positive pulse width to the signal period, expressed as a percentage. Positive overshoot Amplitude (voltage) measurement. Max * High PositiveOvershoot + 100% Amplitude TDS 694C User Manual Glossary–8...
Page 282 Reference memory Memory in a oscilloscope used to store waveforms or settings. You can use that waveform data later for processing. The oscilloscope saves the data even when the oscilloscope is turned off or unplugged. TDS 694C User Manual Glossary–9...
Page 283 A button that changes which of the two cursors is active. Selected waveform The waveform on which all measurements are performed, and which is affected by vertical position and scale adjustments. The light over one of the channel selector buttons indicates the current selected waveform. TDS 694C User Manual Glossary–10...
Page 284 An event that marks time zero in the waveform record. It results in acquisi- tion and display of the waveform. Trigger level The vertical level the trigger signal must cross to generate a trigger (on edge trigger mode). TDS 694C User Manual Glossary–11...
Page 285 (on the vertical axis) as it varies over time (on the horizontal axis). Zip drive An optional external disk drive you connect to the Centronix port. You can save and recall waveforms, acquisitions, image histograms, setups, and hardcopies to an attached Iomega Zip drive. TDS 694C User Manual Glossary–12...
Page 287 Interval, Glossary–1 BMP, 3–129 Mode, envelope, 3–20 BMP Color, Hardcopy menu, 3–131 Modes BMP Mono, Hardcopy menu, 3–131 Average, 3–20 Peak detect, 3–20 AUX TRIGGER INPUT, 2–5 Sample, 3–20 DELAYED TRIGGER OUTPUT, 2–5 Readout, 3–22 TDS 694C User Manual Index–1...
Page 288 Change Colors, Color menu, 3–31 Reset Current Palette To Factory, 3–34 Channel, Glossary–2 Reset to Factory Color, 3–31 Readout, 2–6, 3–8, 3–35 Restore Colors, 3–33 Reference Indicator, 2–6, 3–8 Saturation, 3–32 Selection buttons, 2–17, 3–9 TDS 694C User Manual Index–2...
Page 289 CURSOR button, 3–103 Coupling, 3–87 Cursor menu, 3–103, 3–160, 3–181 Delay by, 3–86 1/seconds (Hz), 3–105 Delay by Events, 3–86 Function, 3–103, 3–104 Delay by Time, 3–86 H Bars, 3–103, 3–104 Falling edge, 3–87 Independent, 3–104 TDS 694C User Manual Index–3...
Page 290 EPS Color Img, Hardcopy menu, 3–131 Dots style, 3–150 EPS Color Plt, Hardcopy menu, 3–131 Filter, 3–28 EPS Mono Img, Hardcopy menu, 3–131 Frame, 3–28 EPS Mono Plt, Hardcopy menu, 3–131 Full, 3–28 Epson, 3–129 Graticule, 3–28 TDS 694C User Manual Index–4...
Page 291 Graticule, Display menu, 3–28 Drives, 3–128 Grid, Display menu, 3–28 File Utilities, 3–125 Ground coupling, Glossary–5 Format, 3–128 GROUP 1, GROUP 2 ... buttons, 3–35 Icons, 3–119, 3–122, 3–126, 3–128 Overwrite Lock, 3–128 Print, 3–127 Rename, 3–126 TDS 694C User Manual Index–5...
Page 292 Hardcopy, Color menu, 3–31 HPGL, Hardcopy menu, 3–131 Hardcopy, Utility menu, 3–141 Hue, Color menu, 3–31 Help, Accessing, 3–143 HELP button, 3–145 Help system, 3–143 HF Rej, Main Trigger menu, 3–51 I/O, Status menu, 3–143 High, 3–91, Glossary–5 TDS 694C User Manual Index–6...
Page 293 Limit Test Condition Met, Acquire menu, 3–151 Goes FALSE, 3–59, 3–61 Limit Test Setup, Acquire menu, 3–150, 3–151 Goes TRUE, 3–59, 3–61 Limit Test Sources, Acquire menu, 3–150 HF Rej, 3–51 Limit Test, Acquire menu, 3–151 TDS 694C User Manual Index–7...
Page 294 Mean +– 2 StdDev, 3–109 Negative duty cycle, 3–91 Mean +– 3 StdDev, 3–109 Negative overshoot, 3–91 Mean dBm, 3–92, B–10 Negative width, 3–91 MEASURE button, 3–93, 3–109 Overshoot, Glossary–8 Measure Delay menu Peak Hits, 3–109 TDS 694C User Manual Index–8...
Page 295 Negative width, 3–91 Save/Recall Waveform, 3–121 Negative, Main Trigger menu, 3–72, 3–74, 3–77 Setup, 2–10, 3–8 No Process, More menu, 3–155 Status, 3–143 Noise Utility, 3–23, 3–130 reducing in FFTs, 3–166 Mid Ref, Measure menu, 3–97 TDS 694C User Manual Index–9...
Page 296 High voltage, D–2 PCX, Hardcopy menu, 3–131 Low impedance Zo, D–2 Peak detect acquisition mode, 3–20, Glossary–8 Optical, D–5 Peak Hits, 3–109 Option 31 to add, A–1 Peak to peak, 3–91, Glossary–8 Option 33 to add, A–1 TDS 694C User Manual Index–10...
Page 297 RUN/STOP, Acquire menu, 3–23 Recall Factory Setup, Save/Recall Setup menu, 3–119 Runt trigger, 3–69, 3–70, Glossary–10 Recall Saved Setup, Save/Recall Setup menu, 3–119 How to set up, 3–73–3–88 Recalling Runt, Main Trigger menu, 3–73 Acquisitions, 3–120 TDS 694C User Manual Index–11...
Page 298 Set Function to, More menu, 3–153 Snapshot, Measure menu, 3–99 SET LEVEL TO 50% button, 3–46 Software version, 3–143 Set Levels in % units, Measure menu, 3–96 Source, Delayed Trigger menu, 3–87 Set operator to, More menu, 3–154 TDS 694C User Manual Index–12...
Page 299 Triggering on Waveforms, 3–41 Timeout, Main Trigger menu, 3–81, 3–82 True for less than, Main Trigger menu, 3–59 TLA Cross Trigger, 3–64 True for more than, Main Trigger menu, 3–59 TLA Cross Trigger ..., Main Trigger menu, 3–51 TDS 694C User Manual Index–13...
Page 300 External Attenuation, 3–13 Blackman-Harris, 3–159, 3–171, 3–174 Fine Scale, 3–13 characteristics of, 3–172 Offset, 3–13 Hamming, 3–159, 3–171, 3–174 Position, 3–13 Hanning, 3–159, 3–171, 3–174 Set to Zero, 3–13 rectangular, 3–159, 3–171, 3–174 VERTICAL MENU button, 2–18 TDS 694C User Manual Index–14...
Page 301 ZOOM button, 3–35 Zoom feature, 3–34 Zoom menu YT, Format, 3–29 Dual Zoom, 3–38 YT format, Glossary–12 Dual Zoom Offset, 3–39 YT, Display menu, 3–29 Preview, 3–37 Reset Zoom Factors, 3–37 Zero phase reference point, 3–163, 3–168 TDS 694C User Manual Index–15...
Page 302 Index TDS 694C User Manual Index–16...

Tektronix TDS 694C User Manual

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