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Tektronix TDS 620 User Manual

Tektronix TDS 620 User Manual

Digitizing
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Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
User Manual
TDS 620 & 640
Digitizing Oscilloscopes
070-8506-01
Please check for change information at the
rear of this manual.
First Printing AUG 1992
Revised NOV 1992

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  • Page 1 ® Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) User Manual TDS 620 & 640 Digitizing Oscilloscopes 070-8506-01 Please check for change information at the rear of this manual. First Printing AUG 1992 Revised NOV 1992...
  • Page 2 Instrument Serial Numbers Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the serial number are assigned sequentially and are unique to each instrument.
  • Page 3 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located.
  • Page 4 This apparatus has been designed and tested in accordance with IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus, and has been supplied in a safe condition. This manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the apparatus in safe condition.
  • Page 5 Welcome This is the User Manual for the TDS 620 and TDS 640 Digitizing Oscillo- scopes. If you are a new user, the Tutorial section will help you become familiar with the operation of your oscilloscope. The Concepts section covers basic principles of oscilloscope operation.
  • Page 6 Welcome The Tutorial and In Detail sections list various procedures which you will Conventions perform. This manual uses the following conventions to keep the instructions clear and concise: Names of front-panel controls and menu labels appear in boldface print. Names are shown as they appear on the oscilloscope front panel and menus (initial capitals, all uppercase, etc.).

  • Page 7: Table Of Contents

    ........... 3-39 TDS 620 & TDS 640 User Manual...
  • Page 8 Contents Help ............3-47 Horizontal Control .

  • Page 9: Product Description

    2 Gigasamples/second maximum digitizing rate. Four channels for acquisition—the TDS 640 lets you use and display all four channels simultaneously; the TDS 620 lets you use and display any two channels simultaneously. All channels can acquire at the maximum digitizing rate.
  • Page 10 Product Description Product Description...
  • Page 11 DANGER indicates a personal injury hazard immediately accessible as one reads the marking. This symbol appears in manuals: Static-Sensitive Devices These symbols appear on equipment: DANGER Protective ATTENTION High Voltage ground (earth) Refer to terminal manual TDS 620 & TDS 640 User Manual...
  • Page 12 Safety Observe all of these precautions to ensure your personal safety and to pre- Specific Precautions vent damage to either the oscilloscope or equipment connected to it. Power Source The oscilloscope is intended to operate from a power source that will not apply more than 250 V between the supply conductors or between either supply conductor and ground.
  • Page 13 90 to 250 VAC , continuous range, 47 Hz to 63 Hz, and may require up to 300 W. 5. Connect the proper power cord from the rear-panel power connector (Figure i) to the power system. TDS 620 & TDS 640 User Manual...
  • Page 14 Start Up Power Connector Principal Power Switch Fuse Figure i: Rear Panel Controls Used in Start Up Table i: Fuse and Fuse Cap Part Numbers Fuse Fuse Part Fuse Cap Part Number Number .25 inch 1.25 inch (UL 198.6, 3AG): 159-0013-00 200-2264-00 6 A FAST, 250 V.
  • Page 15 (If the self test passed, the status display screen will be removed after a few seconds.) Check the self test results. 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 serv- iced.
  • Page 16 Start Up Signal Path Compensation (SPC) lets you compensate your oscilloscope for the current ambient temperature, helping to ensure maximum possible accu- racy for your most critical measurements. See Signal Path Compensation on page 3-109 for a description of and operating information on this key feature. Probe Cal lets you compensate any channel of your oscilloscope for the effect of the probe on gain accuracy and offset accuracy.
  • Page 17 Tutorial Replace this page with the tab divider of the same name.

  • Page 19: Overview

    BNC connectors along the lower right of the front panel. Then, connect the probe from the CH 1 connector to the PROBE COMPENSATION connec- tors (Figure 1-1). Figure 1-1: Connecting a Probe for the Examples TDS 620 & TDS 640 User Manual...

  • Page 20: Example 1: Displaying A Waveform

    Example 1: Displaying a Waveform In this first example you learn about resetting the oscilloscope, displaying and adjusting a waveform, and using the autoset function. Begin each example by resetting the oscilloscope to a known factory default Resetting the state. Reset the oscilloscope when you begin a new task and need to “start Oscilloscope fresh”...
  • Page 21 4. Press SET LEVEL TO 50% (see Figure 1-4). This ensures the oscilloscope triggers on the input signal. SET LEVEL TO 50% Button Figure 1-4: Trigger Controls TDS 620 & TDS 640 User Manual...
  • Page 22 Example 1: Displaying a Waveform Figure 1-5 shows the display that results from the instrument reset. There are Display Elements several important points to observe: The trigger level bar shows that the waveform is triggered at a level near 50% of its amplitude (from step 4). The trigger position indicator shows that the trigger position of the wave- form is located at the horizontal center of the graticule.
  • Page 23 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 s/div now, and you should see two complete waveform cycles on the display. TDS 620 & TDS 640 User Manual...
  • Page 24 Example 1: Displaying a Waveform When you first connect a signal to a channel and display it, the signal dis- Using Autoset played may not be scaled and triggered correctly. Use the autoset function to quickly get a meaningful display. When you reset the oscilloscope, you see a clear, stable display of the probe compensation waveform.
  • Page 25 (see Figure 1-10). If so, you may need to compensate your probe. The documentation included with such probes explains how to do that. Figure 1-10: Display Signals Requiring Probe Compensation TDS 620 & TDS 640 User Manual...

  • Page 26: Example 2: Multiple Waveforms

    Adding a Waveform On the TDS 640 Digitizing Oscilloscope, these are CH 1, CH 2, CH 3, CH 4, and MORE (Figure 1-11); on the TDS 620, they are CH 1, CH 2, AUX 1, AUX 2, and MORE. Figure 1-11: The Channel Buttons and Lights (TDS 640 Shown) Each of the channel (CH) buttons has a light above its label.
  • Page 27 (side) to toggle the selection to 50 . That changes the input coupling of channel 2 from 1 M to 50 . The channel readout for chan- nel 2 (near the bottom of the graticule) now shows an indicator. TDS 620 & TDS 640 User Manual...
  • Page 28 Example 2: Multiple Waveforms Running: 100kS/s Sample Ch2 Reference Indicator Side-Menu Title Figure 1-12: The Vertical Main Menu and Coupling Side Menu Pressing a channel (CH) button sets the vertical controls to that channel. It Changing Controls also adds the channel to the display if that waveform is not already displayed. to Another Channel 1.
  • Page 29 The channel (CH) lights now indicate channel 1. Channel 1 has become the selected channel. When you remove the last waveform, all the CH lights are turned off. 2. Press WAVEFORM OFF again to remove the channel 1 waveform. 1 11 TDS 620 & TDS 640 User Manual...

  • Page 30: Example 3: Automated Measurements

    Example 3: Automated Measurements In this example you learn how to use the automated measurement system to get numeric readouts of important waveform characteristics. The signal display must be stable to use the automated measurement sys- Displaying tem. Also, the waveform must have all the segments necessary for the mea- Automated surement you want.
  • Page 31 8. To move the measurement readouts outside the graticule area, press CLEAR MENU (see Figure 1-15). Running: 100kS/s Sample Press here to remove menus from screen. Figure 1-15: Four Simultaneous Measurement Readouts 1 13 TDS 620 & TDS 640 User Manual...
  • Page 32 Example 3: Automated Measurements Use the Measure menu to remove unwanted measurement displays. You can Removing remove any one, or all measurement readouts with a single menu item. Measurement Readouts Press MEASURE Remove Measrmnt (main) Measurement 1, Mea- surement 2, and Measurement 4 (side) to remove those measurements. Leave the rise time measurement displayed.
  • Page 33 1. Press Snapshot (main) to pop up a snapshot of all available single waveform measurements. (See Figure 1-17.) 1 15 TDS 620 & TDS 640 User Manual...
  • Page 34 Example 3: Automated Measurements Figure 1-17: Snapshot of Channel 1 The snapshot display includes the notation Ch 1, meaning the measure- ments displayed are taken on the channel 1 waveform. Take a snapshot of a waveform in another channel by first selecting that channel using the channel selection buttons.

  • Page 35: Example 4: Saving Setups

    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. 1 17 TDS 620 & TDS 640 User Manual...

  • Page 36: Recalling A Setup

    Example 4: Saving Setups Figure 1-18: Save/Recall Setup Menu 7. Press –more– (side) until the setup location you want is highlighted. Press To Setup (side). That will store the current instrument settings into that setup location. Remember which setup location you selected. Once you have saved a particular setup, you can change the settings as you wish, knowing that you can come back to that setup at any time.
  • Page 37 Concepts Replace this page with the tab divider of the same name.

  • Page 39: Overview

    For More Information, a t the end of each topic, will point you to sources where more information can be found. To explore these and other topics in more depth, see In Detail starting on Page 3-1. TDS 620 & TDS 640 User Manual...

  • Page 40: Triggering

    Triggering This section discusses triggering in general and describes the main-trigger system and the delayed-trigger system. Triggers determine when the oscilloscope starts acquiring and displaying a waveform. Triggers help make untriggered or unstable waveforms or blank screens into meaningful waveforms (see Figure 2-1). Triggered Waveform Untriggered Waveforms Figure 2-1: Triggered Versus Untriggered Displays...
  • Page 41 Although the unsynced waveform may “roll” across the display, it will not disappear as it would in normal trigger mode. Monitoring of a power supply output is an example of such an application. TDS 620 & TDS 640 User Manual...
  • Page 42 Triggering Holdoff When a trigger event is recognized, the oscilloscope disables the trigger system until acquisition is complete. The trigger system remains disabled during the holdoff period that follows each acquisition. Set holdoff time to help ensure a stable display. The trigger signal can be a complex waveform with many possible trigger points on it.
  • Page 43 Set the trigger slope by selecting Slope in the Main Trigger menu and then selecting from the rising or falling slope icons in the side menu that appears. The level control determines where on that edge the trigger point occurs (see Figure 2-3). TDS 620 & TDS 640 User Manual...
  • Page 44 Triggering Positive-Going Edge Negative-Going Edge Trigger Level Can be Adjusted Vertically Trigger Slope Can be Positive or Negative Figure 2-3: Slope and Level Controls Help Define the Trigger Set the main-trigger level with the trigger MAIN LEVEL knob. The delayed-trigger system provides an edge trigger (no pulse or logic trig- Delayed Trigger gers).

  • Page 45: Acquisition

    Record length is the number of points (or samples) that make up the wave- form record. You can set the record length in the Horizontal menu. The oscil- loscope provides record lengths of 500, 1000, and 2000 samples. TDS 620 & TDS 640 User Manual...
  • Page 46 Acquisition Sampling Sampling is the process of converting the analog input signal to digital for display and processing (see Figure 2-5). Record Points Sampling Rate Figure 2-5: Real-Time Sampling Interpolation Interpolation is the process used to create intervening points in the waveform record when the time base is set faster than the oscilloscope can acquire samples to complete the waveform.

  • Page 47: Acquisition Modes

    50 system, be sure to switch the channel input coupling to 1 M See Scaling and Positioning Waveforms , on page 2-10. For More Information See Acquisition Modes , on page 3-12. TDS 620 & TDS 640 User Manual...

  • Page 48: Scaling And Positioning Waveforms

    Scaling and Positioning Waveforms Scaling and positioning waveforms increass or decreases their displayed size and moves them up, down, right, and left on the display. The channel reference indicator and the record view icons, help you quickly see the position of the waveform in the display (see Figure 2-6). The channel reference icon points to the ground of the waveform record when offset is set to 0 V.
  • Page 49 The oscilloscope shows the actual scale in the bottom right of the display. The scale readout shows the time per division used. Since all live waveforms use the same time base, the oscilloscope only displays one value for all the active channels. 2 11 TDS 620 & TDS 640 User Manual...
  • Page 50 Scaling and Positioning Waveforms Aliasing Aliasing occurs because the oscilloscope cannot sample the signal fast enough to construct an accurate waveform record (Figure 2-7). When aliasing happens, you see a waveform with a frequency lower than the actual wave- form being input or a waveform that is not stable, even though the light next to TRIG’D is lit.
  • Page 51 See Autoset , on page 3-17. For More Information See Delayed Triggering , on page 3-24. See Horizontal Control , on page 3-48. See Vertical Control , on page 3-116. See Zoom , on page 3-122. 2 13 TDS 620 & TDS 640 User Manual...

  • Page 52: Measurements

    Measurements The oscilloscope displays graphs of voltage over time and can help you measure the displayed information. Cursor Automated Readouts Measurements Graticule : 64.0 mV Ch 1 @: 32.0 mV Frequency 100 MHz Ch 1 Period 10 ns Cursors Figure 2-8: Graticule, Cursor and Automated Measurements The oscilloscope provides three measurement classes: graticules, cursors, Measurement and automated measurements (see Figure 2-8).
  • Page 53 Figure 2-9: Cursor Modes Independent mode cursors operate by moving one cursor at a time (the active cursor) using the general purpose knob. Press TOGGLE to toggle which cursor bar is active. 2 15 TDS 620 & TDS 640 User Manual...
  • Page 54 Measurements Tracking mode cursors operate in tandem: you move both cursors at the same time using the general purpose knob. To adjust the solid cursor relative to the dashed cursor, press the TOGGLE button to suspend cursor tracking and use the general purpose knob to make the adjust- ment.
  • Page 55 In Detail Replace this page with the tab divider of the same name.

  • Page 57: Overview

    Waveform Math Measurement System Zoom Probe Cal Many of these tasks list steps you perform to accomplish the task. You should read Conventions on page ii of Welcome before reading about these tasks. TDS 620 & TDS 640 User Manual...

  • Page 58: At A Glance

    At a Glance The At a Glance section contains illustrations of the display, the front and rear panels, and the menu system. These will help you understand and operate the oscilloscope. This section also contains a visual guide to using the menu system.
  • Page 59 At a Glance Front Panel Map— Left Side Side-Menu Buttons, page 3-7 ON/STBY Switch, Main-Menu Buttons, CLEAR MENU page ix page 3-7 Removes Menus from the Display TDS 620 & TDS 640 User Manual...
  • Page 60 At a Glance Front Panel Map — Right Side Measurement System, page 3-65 Display Modes, page 3-30 Remote Communication, page 3-98 Cursor Measurements, page 3-19 Hardcopy, page 3-39 Saving and Recalling Waveforms, page Acquisition Modes, 3-104 page 3-12 Cursor Measurements, page 3-19 Saving and Recalling Setups page 3-102...
  • Page 61 SIGNAL OUT – (Provides analog signal output) AUX TRIGGER INPUT – (Provides auxiliary trigger signal input) MAIN TRIGGER OUTPUT – (Provides main trigger (TTL) output) DELAYED TRIGGER OUTPUT – (Provides delayed trigger (TTL) output) TDS 620 & TDS 640 User Manual...

  • Page 62: Display Map

    At a Glance Display Map When present, the general The value entered with purpose knob makes coarse the general purpose The acquisition Trigger position (T), adjustments; when absent, knob status, page 3-12 page 3-112 fine adjustments The waveform record icon Indicates position of vertical bar cursors in the waveform record,...
  • Page 63 3. Press one of these buttons to select from side menu (if displayed). 4. If side menu item has an ad- justable value (shown in re- verse video), adjust it with the general purpose knob or keypad. TDS 620 & TDS 640 User Manual...
  • Page 64 At a Glance To Operate a Pop-Up Menu Press Press here to to display pop-ups. remove menus from screen. Press it again to make selection. A pop-up selection changes the other main menu titles. In Detail...
  • Page 65 (see the Programmer manual for more details Cursor Menu see page 3-19) Delayed Trigger Menu (see page 3-24) Display Menu see page 3-30 ) Hardcopy Menu (see page 3-39) Horizontal Menu (see page 3-48) TDS 620 & TDS 640 User Manual...
  • Page 66 At a Glance Press these buttons: To bring up these menus: Main Trigger Menu – Edge (see page 3-35) Main Trigger Menu – Logic (see page 3-57) Main Trigger Menu –Pulse (see page 3-91) Measure Menu (see page 3-65) More Menu (see page 3-119) Save/Recall Setup Menu (see page 3-102)
  • Page 67 3-103 and 3-42) Utility Menu – Diagnostics see the Service manual) Utility Menu – I/O (see page 3-98) Vertical Channel Menu see page 3-116) Zoom Menu see page 3-122) 3 11 TDS 620 & TDS 640 User Manual...

  • Page 68: Acquisition Modes

    Acquisition Modes The acquisition system has several options for converting analog data into digital form. The Acquisition menu lets you determine the acquisition mode and how to start and stop acquisitions. The oscilloscope supports three acquisition modes. Description of Modes Sample Envelope Average...
  • Page 69 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 3-1: How the Acquisition Modes Work TDS 620 & TDS 640 User Manual 3 13...
  • Page 70 Acquisition Modes Acquisition Readout The acquisition readout at the top of the display (Figure 3-2) shows the state of the acquisition system (running or stopped). The “running” state shows the sample rate and acquisition mode. The “stopped” state shows the number of acquisitions acquired since the last stop or major change.
  • Page 71 Acquire and Stop After menus, press SHIFT FORCE TRIG. Now the RUN/STOP button operates as just described. (You still must display the Acquire menu and then the Stop After menu to leave Single Acquisition Sequence operation.) 3 15 TDS 620 & TDS 640 User Manual...
  • Page 72 Acquisition Modes Limit Test Condition Met (side) lets you acquire waveforms until wave- form data exceeds the limits specified in the limit test. Then acquisition stops. At that point, you can also specify other actions for the oscillo- scope to take, using the selections available in the Limit Test Setup main menu.

  • Page 73: Autoset

    When no channels are displayed, autoset will turn on channel one (CH 1) and scale it. Table 3-1 on the following page lists the autoset defaults. Autoset Defaults 3 17 TDS 620 & TDS 640 User Manual...
  • Page 74 Autoset Table 3-1: Autoset Defaults Control Changed by Autoset to Selected channel Numerically lowest of the displayed channels Acquire Mode Sample Acquire Stop After RUN/STOP button only Display Style Vectors Display Intensity—Overall If less than 50%, set to 75% Display Format Horizontal Position Centered within the graticule window Horizontal Scale...

  • Page 75: Cursor Measurements

    The short horizontal bars mea- sure vertical parameters (typically volts); the long vertical bars measure horizontal parameters (typically time or frequency). (See Cursor Readouts on page 3-20 for more information.) 3 19 TDS 620 & TDS 640 User Manual...
  • Page 76 Cursor Measurements NOTE When cursors measure certain math waveforms, the measurement may not be of time, frequency, or voltage. Cursor measurement of those math waveforms that are not of time, frequency or voltage is described in Waveform Math, which begins on page 3-119. For those oscilloscopes equipped with Option 2F, the advanced DSP math option, the instruction manual shipped with the option de- scribes the use of cursors to measure such waveforms and the...
  • Page 77 To take cursor measurements, press CURSOR to display the Cursor menu Operation (Figure 3-6). Function Use the Function menu to select the type of cursors you want: Press CURSOR Function (main) H Bars, V Bars, Paired, or Off (side). 3 21 TDS 620 & TDS 640 User Manual...
  • Page 78 Cursor Measurements Position of Vertical Bar Cursors (Useful for Locating Cursors Outside the Display) Cursor Readout (Paired) Selected Cursor (Solid Vertical Bar; Solid Horizontal Bar) Non-selected Cursor (Dashed Vertical Bar; Solid Horizontal Bar) Figure 3-7: Paired Cursor Menu and Readouts Mode Use the Mode menu to select the cursor mode.
  • Page 79 See the TDS Family Option 2F Instruction Manual if your oscilloscope is equipped with the advanced DSP math option. This manual provides informa- tion on cursor units with integrated, differentiated, and FFT waveforms. 3 23 TDS 620 & TDS 640 User Manual...

  • Page 80: Delayed Triggering

    Delayed Triggering The TDS 600 Digitizing Oscilloscopes provide a main time base and a delayed time base. Both require a trigger signal and an input source dedi- cated to that signal. Delay can only be used with the edge trigger and certain classes of pulse triggers.
  • Page 81 The end of the zone corresponds to the end of the delayed record. To learn how to define the intensity level of the normal and intensified waveform, see Display Modes on page 3-30. 3 25 TDS 620 & TDS 640 User Manual...
  • Page 82 Delayed Triggering Pretrigger Record Posttrigger Record Delayed Runs After Main Delayed Trigger Waveform Record Main Trigger Point Main Trigger Source Time Delay Start Posttrigger Acquisition (From Horiz Menu) Delayed Triggerable By Events Delayed Trigger Waveform Record Main Trigger Point Main Trigger Source Delayed...
  • Page 83 You will still need to display the Horizontal menu if you wish to leave Delayed Triggerable. The Source menu lets you select which input will be the delayed trigger source. 3 27 TDS 620 & TDS 640 User Manual...
  • Page 84 Delayed Triggering 7. Press Source (main) Ch1, Ch2, Ch3 (Aux1 on the TDS 620), Ch4 (Aux2 on the TDS 620), or Auxiliary (side). Figure 3-11: Delayed Trigger Menu 8. Press Coupling (main) DC, AC, HF Rej, LF Rej, or Noise Rej (side) to define how the input signal will be coupled to the delayed trigger.
  • Page 85 Set to 50% fixes the delayed trigger level to 50% of the peak-to-peak value of the delayed trigger source signal. See Triggering , on page 2-2. For More Information See Triggering , on page 3-112. 3 29 TDS 620 & TDS 640 User Manual...

  • Page 86: Display Modes

    Display Modes The oscilloscope can display waveform records in different ways. The Display menu lets you adjust the oscilloscope display style, intensity level, graticule, and format. Press DISPLAY to show the Display menu. Operation Figure 3-12: Display Menu—Style Display Style Press DISPLAY Style (main) Vectors, Intensified Samples, Dots,...
  • Page 87 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. (The trigger point indicates the position of the trigger in the waveform record.) 3 31 TDS 620 & TDS 640 User Manual...
  • Page 88 Display Modes 3. Toggle Trigger Bar Style (side) to select either the short or the long trigger bar or to turn the trigger bar off. (See Figure 3-13. Note that both styles are shown for illustrating purposes, but you can only display one style at a time.) The trigger bar is only displayed if the trigger source is an active, dis- played waveform.
  • Page 89 XY or YT (side). When you choose the XY mode, the input you have selected is assigned to the X-axis and the oscilloscope automatically chooses the Y-axis input (see Table 3-2). 3 33 TDS 620 & TDS 640 User Manual...
  • Page 90 Display Modes Table 3-2: XY Format Pairs X-Axis Channel Y-Axis Channel (User Selectable) (Fixed) Ch 1 Ch 2 Ch 3 Ch 4 Ref 1 Ref 2 Ref 3 Ref 4 For example, if you press the CH 1 button, the oscilloscope will display a graph of the channel 1 voltage levels on the X-axis against the channel 2 voltage levels on the Y-axis.

  • Page 91: Edge Triggering

    To select which source you want for the trigger: Press TRIGGER MENU Type (main) Edge (pop-up) Source (main) Ch1, Ch2, Ch3 (Aux1 on the TDS 620), Ch4 (Aux2 on the TDS 620), AC Line, or Auxiliary (side). 3 35 TDS 620 & TDS 640 User Manual...
  • Page 92 Edge Triggering Figure 3-15: Main Trigger Menu—Edge Type Coupling To select the coupling you want: Press TRIGGER MENU Type (main) Edge (pop-up) Cou- pling (main) DC, AC, HF Rej, LF Rej, or Noise Rej (side). DC passes all of the input signal. In other words, it passes both AC and DC components to the trigger circuit.
  • Page 93 The amount of time the oscilloscope waits depends on the time base setting. In Normal mode the oscilloscope acquires a waveform only if there is a valid trigger. 3 37 TDS 620 & TDS 640 User Manual...
  • Page 94 Edge Triggering 2. Press Holdoff (side). Enter the value in % using the general purpose knob or the keypad. Holdoff can be set from 0% (minimum holdoff available) to 100% (maximum available). See Holdoff, Variable, Main Trigger on page A-22 of Appendix B for the typical minimum and maximum values.

  • Page 95: Hardcopy

    EPS Mono and Color formats are compatible with the Tektronix Phaser Color Printer, HPGL is compatible with the Tektronix HC100 Plotter, and Epson is compatible with the Tektronix HC200 Printer.
  • Page 96 Hardcopy Setting Communication Parameters To set up the communication parameters: Press SHIFT UTILITY System (main) I/O (pop-up) Confi- gure (main) Hardcopy (Talk Only) (side) (see Figure 3-16). Figure 3-16: Utility Menu—System I/O Setting Hardcopy Parameters To specify the hardcopy format, layout, and type of port using the hardcopy menu: 1.
  • Page 97 The size of the spool is, therefore, variable. The number of hardcopies that can be spooled depends on three variables: the amount of unused RAM the hardcopy format chosen the complexity of the display 3 41 TDS 620 & TDS 640 User Manual...
  • Page 98 Hardcopy Date/Time Stamping Your Hardcopy You can display the current date and time on screen so that it appears on the hardcopies you print. To date and time stamp your hardcopy: 1. Press DISPLAY Readout Options (main) Display Date and Time (side) to toggle the setting to On.
  • Page 99 RS-232 and Centronics ports. Use a printer/plotter with a GPIB connector. Use a GPIB-to-Centronics or GPIB-to-RS-232 converter box. Send the data to a computer with both GPIB and RS-232 or Centronics ports. 3 43 TDS 620 & TDS 640 User Manual...
  • Page 100 Hardcopy Using a GPIB-Based Hardcopy Device You can connect the oscilloscope directly to a GPIB-based hardcopy device (see Figure 3-19). An example of a GPIB hardcopy device is the Tektronix HC100 Plotter. Oscilloscope Hardcopy Device (e.g., Tek HC100) GPIB Cable...
  • Page 101 Hardcopy Device Figure 3-21: Connecting the Oscilloscope and Hardcopy Device Via a PC If your controller is PC-compatible and it uses the Tektronix GURU or S3FG210 (National Instruments GPIB-PCII/IIA) GPIB package, you can operate this setup as follows: 1. Use the MS-DOS cd command to move to the directory that holds the software that came with your GPIB board.
  • Page 102 Your hardcopy device should now print a picture of the oscilloscope screen. See Remote Communication , on page 3-98. For More Information See the TDS Family Option 13 Hardcopy Interface Instruction Manual , Tektronix part number 070-8567-00 (Option 13 equipped instruments only). 3 46 In Detail...

  • Page 103: Help

    HELP again to re-enter help mode. Figure 3-22: Initial Help Screen 3 47 TDS 620 & TDS 640 User Manual...

  • Page 104: Horizontal Control

    Horizontal Control Use the horizontal menu and knobs to control the horizontal part of the dis- play (the time base). By changing the horizontal scale, you can focus on a particular portion of a Horizontal Knobs waveform. By adjusting the horizontal position, you can move the waveform right or left to see different portions of it.
  • Page 105 The end of the zone corresponds to the end of the waveform record. To learn how to change the intensity of the normal and intensified waveform, see Display Modes on page 3-30. 3 49 TDS 620 & TDS 640 User Manual...
  • Page 106 None—only the waveform currently selected can be zoomed and posi- tioned horizontally Live—all channels (including AUX channels for the TDS 620 Oscillo- scope) can be zoomed and positioned horizontally at the same time All—all waveforms displayed (channels, math, and/or reference) can be zoomed and positioned horizontally at the same time See Zoom, on page 3-122 for the steps to set the horizontal lock feature.
  • Page 107 Horizontal Control See Scaling and Positioning Waveforms, on page 2-10. For More Information See Delayed Triggering , on page 3-24. See Zoom, on page 3-122. 3 51 TDS 620 & TDS 640 User Manual...

  • Page 108: Limit Testing

    Limit Testing Limit testing provides a way to automatically compare each incoming wave- form against a template waveform. You set an envelope of limits around a waveform and let the oscilloscope find waveforms that fall outside those limits. When it finds such a waveform, the oscilloscope can generate a hard- copy, ring a bell, stop and wait for your input, or any combination of these actions.
  • Page 109 The waveform appears on the display. NOTE To view the waveform data as well as the template envelope, use the Dots display style (see Display Modes on page 3-30). 3 53 TDS 620 & TDS 640 User Manual...
  • Page 110 Limit Testing Limit Test Sources Now specify the channel that will acquire the waveforms to be compared against the template you have created. 1. Press SHIFT ACQUIRE MENU Limit Test Sources (main) Compare Ch1 to, Compare Ch2 to, Compare Ch3 to, or Compare Ch4 to (side).
  • Page 111 If you are comparing each waveform to its own template, the position of each waveform template will track that of its waveform. 3 55 TDS 620 & TDS 640 User Manual...
  • Page 112 Limit Testing If you are comparing two or more waveforms to a common template, that template will track the position of the failed waveform. If more than one waveform fails during the same acquisition , the template will track the position of the waveform in the highest numbered channel (CH 4 or Aux 2, depending on the TDS model number of your digitizing oscilloscope).

  • Page 113: Logic Triggering

    When you use a state trigger, you define: The precondition for each logic input, channels 1, 2, and 3 for the TDS 640 (1, 2, and Aux 1 for the TDS 620) The direction of the state change for the clock input, channel 4 (Aux 2 for the TDS 620) The Boolean logic function—select from clocked AND, NAND, OR, and...
  • Page 114 —At the end of trigger holdoff, the oscilloscope waits until the edge of channel 4 on the TDS 640 (or Aux 2 on the TDS 620) transitions in the speci- fied direction. At that point, the oscilloscope samples the inputs from the other channels and triggers if the conditions defined in Table 3-3 are met.
  • Page 115 The logic inputs are channels 1, 2, 3, and 4 for the TDS 640 and 1, 2, and Aux 1 and Aux 2 for the TDS 620 when using Pattern Logic Triggers. For State Logic Triggers, channel 4 (Aux 2 for the TDS 620) becomes the clock input, leaving the remaining channels as logic inputs.
  • Page 116 Ch1 or Ch2 (side). On the TDS 640 you can also select Ch3 or Ch4 (side). On the TDS 620 you can select Aux1 or Aux2 (side). 2. Use the MAIN TRIGGER LEVEL knob, the general purpose knob, or the keypad to set each threshold.
  • Page 117 Pattern (pop-up) Define Inputs (main) Ch1, Ch2, Ch3, and Ch4 (side). (On the TDS 620, Ch3 and Ch4 are replaced by Aux1 and Aux2.) 2. Repeatedly press each input selected in step 1 to toggle it to either High ( H ), Low ( L ), or Don’t Care ( X ) for each channel. (You can also use the general purpose knob.)
  • Page 118 Logic Triggering Define a Time Qualified Pattern Trigger To time qualify a pattern logic trigger, specify a time that the boolean logic function (AND, NAND, OR, or NOR) must be TRUE (logic high). You also choose the type of of time qualification (greater or less than the time limit specified) as well as the time limit using the Trigger When menu selection.
  • Page 119 When you select State logic triggering, the oscilloscope uses channel 4 on State Operations the TDS 640 (or Aux 2 on the TDS 620) as a clock for a logic circuit made from the rest of the channels. See page 3-59 for details on operations com- mon to both pattern and state triggers.
  • Page 120 Logic Triggering Define Logic To choose the type of logic function you want applied to the input channels: Press TRIGGER MENU Type (main) Logic (pop-up) Class (main) State (pop-up) Define Logic (main) AND, OR, NAND, or NOR (side). See Triggering , on page 2-2. For More Information See Triggering , on page 3-112.

  • Page 121: Measurement System

    Delay Timing measurement. The time between the MidRef crossings of two different traces, or the gated region of the traces. 3 65 TDS 620 & TDS 640 User Manual...
  • Page 122 Measurement System Table 3-4: Measurement Definitions (Cont.) Name Definition Fall Time Timing measurement. Time taken for the falling edge of the first pulse in the waveform or gated region to fall from a High Ref value (default = 90%) to a Low Ref value (default =10%) of its final value.
  • Page 123 Low Ref value (default = 10%) to a High Ref value (default = 90%) of its final value. Voltage measurement. The true Root Mean Square voltage over the entire waveform or gated region. 3 67 TDS 620 & TDS 640 User Manual...
  • Page 124 Measurement System The readout area for measurements is on the right side of the waveform Measurement Display window. You can display and continuously update as many as four measure- ments at any one time. When menus are displayed, the readouts appear in the graticule area.
  • Page 125 1. Press MEASURE Remove Measrmnt (main). 2. Select the measurement to remove from the side menu. If you want to remove all the measurements at one time, press All Measurements (side). 3 69 TDS 620 & TDS 640 User Manual...
  • Page 126 Measurement System Gated 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. When gating is activated, vertical cursors are displayed. Use these cursors to define the section of the waveform you want the oscilloscope to measure.
  • Page 127 Units is helpful for setting precise values. For example, if you are trying to measure specifications on an RS-232-C circuit, you can set the levels precisely to RS-232-C specification voltage values by defining the high and low references in units. 3 71 TDS 620 & TDS 640 User Manual...
  • Page 128 Measurement System High Ref Mid Ref Low Ref Mid2 Ref 2. Press , or (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 default is 10%. Mid2 Ref —Sets the middle reference level used on the second waveform specified in the Delay or Phase Measurements.
  • Page 129 2. Press Measure Delay to (side) repeatedly or turn the general purpose knob to choose the delay to waveform. The choices are Ch1, Ch2, Ch3, Ch4 (on the TDS 640), Ch1, Ch2, Aux1 and Aux2 (on the TDS 620), Math1, Math2, Math3, Ref1, Ref2, Ref3, and Ref4.
  • Page 130 Measurement System Creating the Delay Measurement —Once you have specified the wave- forms you are measuring between and which edges to use, you need to notify the oscilloscope to proceed with the measurement. Press Delay To (main) OK Create Measurement (side). To exit the Measure Delay menu without creating a delay measurement, press CLEAR MENU, which returns you to the Measure menu.
  • Page 131 Select Measrmnt menu. See Appendix C: Algorithms , on page A-25. For More Information See Measurements , on page 2-14. See Tutorial Example 3: Automated Measurements , on page 1-12. 3 75 TDS 620 & TDS 640 User Manual...

  • Page 132: Probe Cal

    Probe Cal You can compensate the entire signal path, from probe tip to digitized signal, to improve the gain and offset accuracy of the probe. By executing Probe Cal on a channel with installed probe, you can optimize the oscilloscope capability to make accurate measurements using that channel and probe.
  • Page 133 14. Note the compensation error amount. Skip to step 19. 15. Disconnect the probe from any signal you may have connected it to. Leave the probe installed on its channel. 16. Press OK Compensate Offset (side). 3 77 TDS 620 & TDS 640 User Manual...
  • Page 134 Probe Cal Figure 3-35: Probe Cal Menu and Gain Compensation Display 17. Wait for offset compensation to complete (one to three minutes). When offset compensation completes, the following occurs: The clock icon will disappear. If offset compensation did not complete successfully, you may get the message “Compensation Error.”...
  • Page 135 Probe Cal, the oscilloscope cannot determine whether it is the same probe. Therefore, it displays the Re-use Probe Calibration data? menu (see Figure 3-36). 3 79 TDS 620 & TDS 640 User Manual...
  • Page 136 Probe Cal Figure 3-36: Re-use Probe Calibration Data Menu If the Re-use Probe Calibration data? menu is displayed, you can choose one of the following options: Press OK Use Existing Data (side) to use the Probe Cal data last stored to compensate the probe.
  • Page 137 Some optical probes and most active probes (including the P6205 shipped with the standard oscilloscope) have complex interfaces. 3 81 TDS 620 & TDS 640 User Manual...

  • Page 138: Probe Compensation

    Probe Compensation Passive probes require compensation to ensure maximum distortion-free input to the oscilloscope and to avoid high frequency amplitude errors (see Figure 3-37). Probe Compensated Correctly Probe Overcompensated Probe Undercompensated Figure 3-37: How Probe Compensation Affects Signals To compensate your probe: Operation 1.
  • Page 139 8. Adjust the probe until you see a perfectly flat top square wave (see Figure 3-37) on the display. Figure 3-38 shows where the adjustment is located. Figure 3-38: P6139A Probe Adjustment See Probe Selection , on page 3-84. For More Information 3 83 TDS 620 & TDS 640 User Manual...

  • Page 140: Probe Selection

    3-90 to select the probe by application. There are five major types of probes: passive, active, current, optical, and time-to-voltage probes which are discussed here. See your Tektronix Prod- ucts Catalog for more information. Passive voltage probes measure voltage. They employ passive circuit compo- Passive Voltage nents such as resistors, capacitors, and inductors.
  • Page 141 High voltage probes have the added advan- tage of lower input capacitance (typically 2-3 pF). P6009 P6015A Figure 3-39: The P6009 and P6015A High Voltage Probes 3 85 TDS 620 & TDS 640 User Manual...
  • Page 142 Probe Selection Active voltage probes, sometimes called “FET” probes, use active circuit Active Voltage elements such as transistors. There are three classes of active probes: Probes High speed active Differential active Fixtured active Active voltage measuring probes use active circuit elements in the probe design to process signals from the circuit under test.
  • Page 143 Current probes enable you to directly observe and measure current wave- Current Probes forms, which can be very different from voltage signals. Tektronix current probes are unique in that they can measure from DC to 1 GHz. Two types of current probes are available: one that measures AC current only and AC/DC probes that utilize the Hall effect to accurately measure the AC and DC components of a signal.
  • Page 144 Probe Selection Optical probes can combine the functions of an optical-power meter with the Optical Probes oscilloscopes high-speed analog waveform analysis capability. You can simultaneously acquire, display, and analyze optical and electrical signals. Applications include measuring the transient optical properties of lasers, LEDs, electro-optic modulators, and flashlamps.
  • Page 145 500 to 950 nm, DC to 250 MHz, 5 V/mW P6713 1100 to 1700 nm, DC to 300 MHz, 5 V/mW Time-to-Voltage Converter TVC 501 Time delay, pulse width and period measurements 3 89 TDS 620 & TDS 640 User Manual...
  • Page 146 Probe Selection You can also classify probes by application. Different applications demand Probes by different probes. Use Table 3-7 to select a probe for your application. Application Table 3-7: Probes by Application Telecommuni- Industrial Consumer/ High Energy Certification, cations & Electronics Computer Pulsed Power...

  • Page 147: Pulse Triggering

    Figure 3-41 shows the pulse trigger readouts. Table 3-8 on page 3-92 de- scribes the choices for the pulse triggers. Trigger Class = Runt Main Time Base Main Time Base Time/Div Figure 3-41: Pulse Trigger Readouts 3 91 TDS 620 & TDS 640 User Manual...
  • Page 148 Pulse Triggering Table 3-8: Pulse Trigger Definitions Name Definition Glitch positive Triggering occurs if the oscilloscope detects positive spike widths less than the specified glitch time. Glitch negative Triggering occurs if the oscilloscope detects negative spike widths less than the specified glitch time.
  • Page 149 Source (main) Ch1 or Ch2 (side). On the TDS 640 you can also press Ch3 or Ch4 (side). On the TDS 620 you can select Aux1 or Aux2 (side). Mode & Holdoff To change the holdoff time and select the trigger mode: 1.
  • Page 150 Pulse Triggering In Normal mode the oscilloscope acquires a waveform only if there is a valid trigger. (You can force a single acquisition by pressing FORCE TRIGGER.) 2. To change the holdoff time, press Holdoff (side). Use the general pur- pose knob or the keypad to enter the value in percent.
  • Page 151 Class (main) Runt (pop-up) Source (main) Ch1, Ch2, Ch3 (Aux1 on the TDS 620), or Ch4 (Aux2 on the TDS 620) (side). (See Figure 3-43.) 2. Press Polarity (main) Positive, Negative, or Either (side). 3. Press Thresholds (main) and set the upper and lower thresholds for runt detection with the side menu selections and the keypad or the general purpose knob.
  • Page 152 Pulse Triggering Polarity Use this menu item to specify the direction of the runt pulse. Press TRIGGER MENU Type (main) Pulse (pop-up) Class (main) Runt (pop-up) Polarity (main) Positive, Negative, or Either (side). Positive looks for positive-going runt pulses. Negative looks for negative-going runt pulses. Either looks for both positive and negative runt pulses.
  • Page 153 Width (pop-up) Level (main) Level, Set to TTL, Set to ECL, or Set to 50% (side). See Triggering , on page 2-2. For More Information See Triggering , on page 3-112. 3 97 TDS 620 & TDS 640 User Manual...

  • Page 154: Remote Communication

    Besides the base protocols, Tektronix has defined codes and formats for messages to travel over GPIB. Each device that follows these codes and formats, such as the TDS 620 and TDS 640, supports standard commands. Use of instruments that support these commands can greatly simplify devel- opment of GPIB systems.
  • Page 155 GPIB Device GPIB Device Figure 3-44: Typical GPIB Network Configuration Cables —An IEEE Std 488.1-1987 GPIB cable (available from Tektronix, part number 012-0991-00) is required to connect two GPIB devices. Connector —A 24-pin GPIB connector is located on the oscilloscope rear panel.
  • Page 156 Remote Communication To set up remote communications, ensure that your oscilloscope is physically Operation cabled to the controller and that the oscilloscope parameters are correctly set. Plug an IEEE Std 488.2-1987 GPIB cable into the GPIB connector on the oscilloscope rear panel and into the GPIB port on your controller (see Fig- ure 3-46).
  • Page 157 Figure 3-47: Utility Menu See Hardcopy, on page 3-39. For More Information See the TDS Family Programmer Manual , Tektronix part number 070-8318-04. See the TDS Family Option 13 Hardcopy Interface Instruction Manual , Tektronix part number 070-8567-00 (Option 13 equipped instruments only).

  • Page 158: Saving And Recalling Setups

    Saving and Recalling Setups You may want to save and reuse setups for many reasons. For example, after changing the setting during the course of an experiment, you may want to quickly return to your original setup. You can save and recall up to ten instru- ment setups from internal oscilloscope memory.
  • Page 159 See Tutorial Example 4: Saving Setups , on page 1-17. For More Information See Factory Initialization Settings , on page A-41. 3 103 TDS 620 & TDS 640 User Manual...

  • Page 160: Saving And Recalling Waveforms

    The information is retained even when you power off the oscillo- scope or unplug it. The oscilloscope can display up to 11 (9 on the TDS 620) waveforms at one time. That includes waveforms from the four (two on the TDS 620) input channels, four reference waveforms, and three math waveforms.
  • Page 161 Ref1, Ref2, Ref3, or Ref4 (main). Note that in Figure 3-50, the main menu items Ref2, Ref3, and Ref4 appear shaded while Ref1 does not. References that are empty appear shaded in the More main menu. 3 105 TDS 620 & TDS 640 User Manual...
  • Page 162 Saving and Recalling Waveforms Figure 3-50: More Menu See Selecting Channels , on page 3-107. For More Information 3 106 In Detail...

  • Page 163: Selecting Channels

    The channel selection buttons are on the right of the display and are labeled CH 1, CH 2, CH 3 (AUX 1 on the TDS 620), CH 4 (AUX 2 on the TDS 620), and MORE. They determine which channel is selected. The MORE button allows you to select internally stored Math and Ref waveforms for display and manipulation.
  • Page 164 To select a channel: Operation Pressing CH 1, CH 2, CH 3 (AUX 1 on the TDS 620), or CH 4 (AUX 2 on the TDS 620) turns the channel on if it is not already on. You do not use the channel selection buttons when triggering. Instead select the trigger source in the Main Trigger menu or Delayed Trigger menu.

  • Page 165: Signal Path Compensation

    Pass or Fail in the main menu. 5. Verify the word Pass appears under Signal Path in the main menu. (See Figure 3-53.) 3 109 TDS 620 & TDS 640 User Manual...
  • Page 166 Signal Path Compensation Figure 3-53: Performing a Signal Path Compensation 3 110 In Detail...

  • Page 167: Status

    Trigger displays parameter information about the triggers. Waveforms displays information about the various waveforms, including live, math, and reference. I/O displays information about the I/O port(s). Firmware Version Figure 3-54: Status Menu—System 3 111 TDS 620 & TDS 640 User Manual...

  • Page 168: Triggering

    Triggering Triggers determine when the oscilloscope starts acquiring and displaying a waveform. The TDS 600 series has three types of triggers: edge, logic, and pulse. Although these three triggers are unique, they have some common character- istics that can be defined and modified using the Trigger menu, buttons, and knob.
  • Page 169 The lights are labeled TRIG’D, READY, and ARM. When TRIG’D is lighted, it means the oscilloscope has recognized a valid trigger and is filling the posttrigger portion of the waveform. 3 113 TDS 620 & TDS 640 User Manual...
  • Page 170 Triggering When READY is lighted, it means the oscilloscope can accept a valid trigger event and it is waiting for that event to occur. When ARM is lighted, it means the trigger circuitry is filling the pretrigger portion of the waveform record. When both TRIG’D and READY are lighted, it means the oscilloscope has recognized a valid main trigger and is waiting for a delayed trigger.
  • Page 171 See Delay Triggering , on page 3-24. For More Information See Edge Triggering , on page 3-35. See Logic Triggering , on page 3-57. See Pulse Triggering , on page 3-91. See Triggering , on page 2-2. 3 115 TDS 620 & TDS 640 User Manual...

  • Page 172: Vertical Control

    Vertical Control You can control the vertical position and scale of the selected waveform using the vertical menu and knobs. By changing the vertical scale, you can focus on a particular portion of a Vertical Knobs waveform. By adjusting the vertical position, you can move the waveform up or down on the display.
  • Page 173 P6205), the input impedance of the oscilloscope automatical- ly becomes 50 . If you then connect a passive probe (like the P6139A ) you need to set the input impedance back to 1 M 3 117 TDS 620 & TDS 640 User Manual...
  • Page 174 Vertical Control Bandwidth To eliminate the higher frequency components, change the bandwidth of the selected channel: Press VERTICAL MENU Bandwidth (main) Full, 100 MHz, or 20 MHz (side). Fine Scale Press VERTICAL MENU Fine Scale (main) to make fine adjustments to the vertical scale using the general purpose knob or the keypad.

  • Page 175: Waveform Math

    (Figure 3-59). The More menu allows you to display, define, and manip- ulate math functions. Figure 3-59: More Menu Math1, Math2, and Math3 1. Press MORE Math1, Math2, or Math3 (main) to select the waveform that you want to display or change. 3 119 TDS 620 & TDS 640 User Manual...
  • Page 176 Waveform Math NOTE If your oscilloscope is equipped with Option 2F, Advanced DSP Math, the menu item FFT will be at the same brightness as the menu items Single Wfm Math and Dual Wfm Math; otherwise, FFT will be dimmed. See the TDS Family Option 2F Instruction Manual for information on FFTs and other advanced math wave- forms.
  • Page 177 If your oscilloscope is equipped with option 2F, you can also create inte- For More grated, differentiated, and Fast Fourier Transform waveforms. If your oscillo- Information scope is equipped with that option, see the TDS Family Option 2F Instruction Manual. 3 121 TDS 620 & TDS 640 User Manual...

  • Page 178: Zoom

    Zoom The Zoom feature expands or compresses a waveform on the display without changing the acquisition parameters. If the waveform is expanded, the oscilloscope may not have acquired enough Zoom and points to display the expanded portion. You can use interpolation (linear or Interpolation sin(x)/x) to create the intervening points.
  • Page 179 Table 3-9: Zoom Defaults Parameter Setting Zoom Vertical Position Zoom Vertical Gain Zoom Horizontal Position Tracking Horizontal Position Zoom Horizontal Gain Press ZOOM Off (side) to return the oscilloscope to normal operation. 3 123 TDS 620 & TDS 640 User Manual...
  • Page 180 Zoom See Acquisition , on page 2-7. For More Information See Display Modes , on page 3-30. 3 124 In Detail...

  • Page 181: Appendices

    Appendices Replace this page with the tab divider of the same name.

  • Page 183: Appendix A: Options And Accessories

    Appendix A: Options and Accessories This section describes the various options as well as the standard and option- al accessories that are available for the TDS 620 and TDS 640 Digitizing Oscilloscopes. The following options are available: Options Options A1–A5: International Power Cords...
  • Page 184 Appendix A: Options and Accessories Option M3: When Option M3 is ordered, Tektronix provides five years of warranty/remedial service and four oscilloscope calibrations. Option M8: When Option M8 is ordered, Tektronix provides four calibra- tions and four performance verifications, one of each in the second through the fifth years of service.
  • Page 185 With this option, Tektronix ships a TD100 Data Manager. Option 4D: Delete Four Probes—(TDS 640 only) With this option, Tektronix ships the instrument without the four P6205 Active Probes normally included as standard accessories. Option 9C: Certificate of Calibration and Test Data Report...
  • Page 186 SMT KlipChip 206-0364-00 You can also order the following optional accessories: Optional Accessories Table A-4: Optional Accessories Accessory Part Number TDS 620 Service Manual 070-8507-00 TDS 640 Service Manual 070-8508-00 Plotter (GPIB and Centronics Standard) HC100 Oscilloscope Cart K218...
  • Page 187 P6711 Opto-Electronic Converter, 500 to 950 nm, DC to 250 MHz 5 V/ P6713 Opto-Electronic Converter, 1100 to 1700 nm, DC to 300 MHz. 5 V/mW. TVC 501 Time-to-voltage converter. Time delay, pulse width and period measurements. TDS 620 & TDS 640 User Manual...
  • Page 188 016-1077-00 springs and insulator Bayonet Ground Assembly 013-0085-00 Probe Tip-to-Chassis Adapter 131-0258-00 Accessory Software The following optional accessories are Tektronix software products recom- mended for use with your oscilloscope: Table A-6: Accessory Software Software Part Number EZ-Test Program Generator S45F030...

  • Page 189: Appendix B: Specification

    The TDS 640 has four input channels labeled CH 1, CH 2, CH 3, and CH 4. The TDS 620 has four input channels labeled CH 1, CH 2, AUX 1, and AUX 2.
  • Page 190 Signal Acquisition System The signal acquisition system of the TDS 620 Digitizing Oscilloscope provides four full-featured vertical channels, CH 1, CH 2, AUX 1 and AUX 2, with calibrated vertical scale factors from 1 mV to 10 V per division. Any two of the four channels can be acquired simultaneously.
  • Page 191 The triggering system is comprised of three types of signals for triggering the Trigger System signal acquisition system: Edge (main- and delayed-trigger systems): This familiar type of triggering is fully configurable for source, slope, coupling, mode (auto or normal), and holdoff. TDS 620 & TDS 640 User Manual...
  • Page 192 Appendix B: Specification Logic (main-trigger system): This type of triggering can be based on pattern (asynchronous) or state (synchronous). In either case, logic triggering is configurable for sources, for boolean operators to apply to those sources, for logic pattern or state on which to trigger, for mode (auto or normal), and for holdoff.
  • Page 193 Digital Signal Processing (DSP) Tektronix’ proprietary digital signal processor, (DSP) is an important compo- nent of the multiprocessor architecture of these oscilloscopes. This dedicated processor supports advanced analysis of waveforms when doing such com- pute-intensive tasks as interpolation, waveform math, and signal averaging.
  • Page 194 Appendix B: Specification The oscilloscope is fully controllable and capable of sending and receiving waveforms over the GPIB interface (IEEE Std 488.1-1987/IEEE Std 488.2-1987 standard). This feature makes the instrument ideal for making automated measurements in a production or research and development environment that calls for repetitive data taking.

  • Page 195: Nominal Traits

    Nominal Traits Oscilloscopes. (Traits that differ according to model or apply only to one model are preceded by the appropriate model number, TDS 620 or TDS 640, in the tables.) Electrical and mechanical traits are included. Nominal traits are described using simple statements of fact such as “identi- cal”...
  • Page 196 Appendix B: Specification Table A-9: Nominal Traits — Time Base System Name Description TDS 620: Range, Sample–Rate 10 Samples/sec to 2 GSamples/sec on two channels simultaneously TDS 640: Range, Sample–Rate 10 Samples/sec to 2 GSamples/sec on four channels simultaneously Range, Interpolated Waveform Rate...
  • Page 197 Construction Material Chassis parts constructed of aluminum alloy; front panel constructed of plastic laminate; circuit boards constructed of glass laminate. Cabi- net is aluminum and is clad in Tektronix Blue vinyl material. Finish Type Tektronix Blue vinyl-clad aluminum cabinet A 15...
  • Page 198 Appendix B: Specification Table A-13: Nominal Traits — Mechanical (Cont.) Name Description Weight Standard Digitizing Oscilloscope 12.3 kg (27 lbs), with front cover. 20.0 kg (44 lbs), when pack- aged for domestic shipment Rackmount Digitizing Oscilloscope 12.3 kg (27 lbs) plus weight of rackmount parts, for the rack- mounted Digitizing Oscilloscope (Option 1R).

  • Page 199: Warranted Characteristics

    Offset Accuracy is the accuracy of this Voltage level. The samples must be acquired under the same setup and ambient conditions. To ensure the most accurate measurements possible, run an SPC calibration first. When using the TDS 620 and/or TDS 640 Digitizing Oscilloscope at a Volts/Div setting of 5 mV/div, an SPC calibration should be run once per week to ensure that instrument performance levels meet specifications.
  • Page 200 Appendix B: Specification Table A-14: Warranted Characteristics — Signal Acquisition System (Cont.) Name Description Analog Bandwidth, DC-50 Volts/Div Bandwidth Coupled, or DC-1 M Coupled with 5 mV/div – 10 V/div DC – 500 MHz P6139A Probe 2 mV/div – 4.98 mV/div DC –...
  • Page 201 The trigger point must not switch between opposite slopes on the waveform, and the display must not “roll” across the screen on successive acquisitions. The TRIG’D LED stays constantly lighted when the SEC/DIV setting is 2 ms or faster but may flash when the SEC/DIV setting is 10 ms or slower. A 19 TDS 620 & TDS 640 User Manual...
  • Page 202 Power Consumption 300 W (450 VA) CH 3 (AUX 1 for TDS 620) signal out is only present at the rear panel if CH 3 (AUX 1) is selected as the trigger source for the main and/or delayed trigger systems.

  • Page 203: Typical Characteristics

    The values given are the maximum absolute difference between the value at the end of a specified time interval after the mid-level crossing of the step, and the value one second after the mid-level crossing of the step, expressed as a percentage of the step ampli- tude. A 21 TDS 620 & TDS 640 User Manual...
  • Page 204 Appendix B: Specification Table A-20: Typical Characteristics — Triggering System Name Description Input, Auxiliary Trigger 1.5 k The input resistance is ; the maximum safe input voltage AC). Error, Trigger Position, Edge Triggering Acquisition Mode Trigger-Position Error Sample, Average WI + 1 ns) Envelope Holdoff, Variable, Main Trigger Minimum: For any horizontal scale setting, the minimum holdoff for a...
  • Page 205 Data is maintained by small lithium-thionyl-chloride batteries internal to the memory ICs. The amount of lithium is so small in these ICs that they can typically be safely disposed of with ordinary garbage in a sanitary landfill. A 23 TDS 620 & TDS 640 User Manual...
  • Page 206 Appendix B: Specification A 24 Appendices...

  • Page 207: Appendix C: Algorithms

    Appendix C: Algorithms The Tektronix TDS 600 Digitizing Oscilloscopes can take 25 automatic mea- surements. By knowing how the instrument makes these calculations, you may better understand how to use your instrument and how to interpret your results. The TDS 600 Digitizing Oscilloscopes use a variety of variables when making Measurement calculations.
  • Page 208 Appendix C: Algorithms The oscilloscope calculates the histogram-based values as High 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 between (also called 3.
  • Page 209 —is the polarity of first crossing (no default). It can be rising or falling. StartCycle —is the starting time for cycle measurements. It is a floating- point number with values between 0.0 and ( RecordLength – 1.0), inclusive. StartCycle = MCross1 A 27 TDS 620 & TDS 640 User Manual...
  • Page 210 Appendix C: Algorithms EndCycle —is the ending time for cycle measurements. It is a floating-point number with values between 0.0 and ( RecordLength – 1.0), inclusive. EndCycle = MCross3 MCross1 MCross3 (StartCycle) (EndCycle) MCross2 MidRef + (Hysteresis x Amplitude) MidRef MidRef –...

  • Page 211: Burst Width

    Mean measurement. If StartCycle = EndCycle then return the (interpolated) value at StartCycle . EndCycle Waveform StartCycle CycleMean = EndCycle StartCycle SampleInterval For details of the integration algorithm, see page A-35. A 29 TDS 620 & TDS 640 User Manual...

  • Page 212: Fall Time

    Appendix C: Algorithms Cycle RMS The true Root Mean Square voltage over one cycle. If StartCycle = EndCycle then CycleRMS = Waveform[Start] . Otherwise, EndCycle Waveform StartCycle CycleRMS = EndCycle StartCycle SampleInterval For details of the integration algorithm, see page A-35. Delay Timing measurement.
  • Page 213 100% (highest) voltage reference value. (See “High, Low” earlier in this section) Using the min-max measurement technique: High 0% (lowest) voltage reference value calculated. (See “High, Low” earlier in this section) Using the min-max measurement technique: A 31 TDS 620 & TDS 640 User Manual...
  • Page 214 Appendix C: Algorithms Maximum Amplitude (voltage) measurement. The maximum voltage. Typically the most positive peak voltage. Examine all Waveform[ ] samples from Start to End inclusive and set Max equal to the greatest magnitude Waveform[ ] value found. Mean The arithmetic mean for one waveform. Remember that one waveform is not necessarily equal to one cycle.
  • Page 215 MCross1Target in the same direction (polarity) as that found for the target waveform is found. 4. The phase is determined by the following: MCross1Ref MCross1Target Phase Period A 33 TDS 620 & TDS 640 User Manual...
  • Page 216 Appendix C: Algorithms If the target waveform leads the reference waveform, phase is positive; if it lags, negative. Phase is not available in the Snapshot display. Positive Duty Cycle Timing measurement. The ratio of the positive pulse width to the signal peri- od, expressed as a percentage.
  • Page 217 = the (interpolated) value at Otherwise, Waveform Start Start SampleInterval For details of the integration algorithm, see below. Integration Algorithm The integration algorithm used by the oscilloscope is as follows: is approximated by where: A 35 TDS 620 & TDS 640 User Manual...
  • Page 218 Appendix C: Algorithms W(t) is the sampled waveform is the continuous function obtained by linear interpolation of W(t) RecordLength A and B are numbers between 0.0 and –1.0 If A and B are integers, then: where s is the sample interval. Similarly, is approximated by where:...
  • Page 219 MidRef samples were out of range. However, if was chosen using the % choice from the Measure menu’s Set Levels in % Units selection, then MidRef could give a “CLIPPING” warning. A 37 TDS 620 & TDS 640 User Manual...
  • Page 220 Appendix C: Algorithms 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.

  • Page 221: Appendix D: Packaging For Shipment

    170 kg (375 pound) test strength. 2. If you are shipping the oscilloscope to a Tektronix field office for repair, attach a tag to the oscilloscope showing the instrument owner and ad- dress, the name of the person to contact about the instrument, the instru- ment type, and the serial number.
  • Page 222 Appendix E: Packaging for Shipment A 40 Appendices...

  • Page 223: Appendix E: Factory Initialization Settings

    Cursor time units Seconds Delayed edge trigger coupling Delayed edge trigger level Delayed edge trigger slope Rising Delayed edge trigger source Channel 1 Delay trigger average # Delay trigger envelope # A 41 TDS 620 & TDS 640 User Manual...
  • Page 224 Appendix E: Factory Initialization Settings Table A-22: Factory Initialization Defaults (Cont.) Control Changed by Factory Init to Delay time 16 ns Delay events, triggerable after main Delayed, delay by ... Delay by Time Delayed, time base mode Delayed Runs After Main Display clock No Change Display format...
  • Page 225 Measure High Ref 90% and 0 V (units) Measure Low Ref 10% and 0 V (units) Measure Mid Ref 50% and 0 V (units) Measure Mid2 Ref 50% and 0 V (units) A 43 TDS 620 & TDS 640 User Manual...
  • Page 226 Appendix E: Factory Initialization Settings Table A-22: Factory Initialization Defaults (Cont.) Control Changed by Factory Init to Pulse glitch trigger polarity Positive Pulse runt high threshold 2.0 V Pulse runt low threshold 0.0 V Pulse runt trigger polarity Positive Pulse trigger class Glitch Pulse trigger filter state On (Accept glitch)

  • Page 227: Glossary & Index

    Glossary & Index Replace this page with the tab divider of the same name.

  • Page 229: Glossary

    That is, the ratio of the input measure to the output measure. For example, a 10X probe will attenuate, or reduce, the input voltage of a signal by a factor of 10. TDS 620 & TDS 640 User Manual...
  • Page 230 Glossary Automatic trigger mode A trigger mode that causes the oscilloscope to automatically acquire if triggerable events are not detected within a specified time period. Autoset A function of the oscilloscope that automatically produces a stable waveform of usable size. Autoset sets up front-panel controls based on the characteristics of the active waveform.
  • Page 231 An interconnection bus and protocol that allows you to connect multiple instruments in a network under the control of a controller. Also known as IEEE 488 bus. It transfers data with eight parallel data lines, five control lines, and three handshake lines. TDS 620 & TDS 640 User Manual...
  • Page 232 Glossary Graticule A grid on the display screen that creates the horizontal and vertical axes. You can use it to visually measure waveform parameters. Ground (GND) coupling Coupling option that disconnects the input signal from the vertical system. Hardcopy An electronic copy of the display in a format useable by a printer or plotter.
  • Page 233 Negative overshoot measurement Amplitude (voltage) measurement. NegativeOvershoot Amplitude Negative width A timing measurement of the distance (time) between two amplitude points—falling-edge MidRef (default 50%) and rising-edge MidRef (default 50%)—on a negative pulse. TDS 620 & TDS 640 User Manual...
  • Page 234 Glossary Normal trigger mode A mode on which the oscilloscope does not acquire a waveform record unless a valid trigger event occurs. It waits for a valid trigger event before acquiring waveform data. A logic (Boolean) function in which the output of the OR function is complemented (true becomes false, and false becomes true).
  • Page 235 A mode in which the oscilloscope triggers on a runt. A runt is a pulse that crosses one threshold but fails to cross a second threshold before recrossing the first. The crossings detected can be positive, negative, or either. TDS 620 & TDS 640 User Manual...
  • Page 236 Glossary Sample acquisition mode The oscilloscope creates a record point by saving the first sample during each acquisition interval. That is the default mode of the acquisition. Sample interval The time interval between successive samples in a time base. For real-time digitizers, the sample interval is the reciprocal of the sample rate.
  • Page 237 It is useful for studying phase relationships between two waveforms. YT format The conventional oscilloscope display format. It shows the voltage of a waveform record (on the vertical axis) as it varies over time (on the horizontal axis). TDS 620 & TDS 640 User Manual...
  • Page 238 Glossary G 10 Glossary...
  • Page 239 Bandwidth, Vertical menu, 3-118 Stop After Limit Test Condition CAUTION Met, 3-54 Bayonet ground assembly, A-6 statement in manuals, vii Template Source, 3-52 statement on equipment, vii Before you begin, xi V Limit, 3-53 TDS 620 & TDS 640 User Manual...
  • Page 240 Compare Ch2 to, Acquire menu, 3-54 Deskjet, 3-39 Compensation, 3-82 Deskjet, Hardcopy menu, 3-40 Configure, Utility menu, 3-40 , 3-100 Differences – TDS 620 and TDS 640, DANGER, statement on equipment, Connector BNC, A-6 Differential active probes, 3-86 Date/Time GPIB, 3-5 , 3-99...
  • Page 241 High-Low Setup, Measure menu, Measurements, 2-14 3-71 Graticule, Display menu, 3-33 Histogram, Measure menu, 3-71 Grid, Display menu, 3-33 Holdoff, Main Trigger menu, 3-61 , 3-93 Ground coupling, G-4 Factory initialization settings, A-41–A-44 TDS 620 & TDS 640 User Manual...
  • Page 242 Index Holdoff, trigger, 2-4 , G-4 Intensified Samples, Display menu, Linear interpolation, Display menu, 3-30 3-32 Horiz Pos, Horizontal menu, 3-50 Intensified, Horizontal menu, 3-25 , Logic trigger, 2-3 , 3-59 Horiz Scale, Horizontal menu, 3-50 3-27 Definitions, 3-59 Horizontal, 3-17 Pattern, 3-58 , G-5 Intensity, 3-31 , G-4 Bar cursors, 2-15 , 3-19 , G-4...
  • Page 243 Low Ref, 3-72 NAND, G-5 Mid Ref, 3-72 Menu NAND, Main Trigger menu, 3-61 , 3-64 Mid2 Ref, 3-72 Acquire, 3-14 , 3-52 Min-Max, 3-71 Cursor, 3-21 Negative duty cycle, 3-66 Reference Levels, 3-71 TDS 620 & TDS 640 User Manual...
  • Page 244 Index Negative overshoot, 3-66 Pattern, Main Trigger menu, 3-59 Probes Accessories, A-3 , A-5–A-6 Negative width, 3-66 PCX, 3-39 Active voltage, 3-86–3-87 Negative, Main Trigger menu, 3-94 , PCX, Hardcopy menu, 3-40 Additional, A-2 , A-3 3-95 By applications, 3-89 , 3-90 Peak to peak, 3-66 , G-6 Noise Rej, Main Trigger menu, 3-36 Compensation, 1-5 , 3-82 , G-7...
  • Page 245 Self test, xi RUN/STOP, Acquire menu, 3-15 Single Wfm Math, More menu, 3-120 Set 1st Source to, More menu, 3-121 Runt trigger, 3-91 , 3-92 , 3-95 , G-8 Runt, Main Trigger menu, 3-95 TDS 620 & TDS 640 User Manual...
  • Page 246 Index Slope, G-8 TDS 620 and 640 differences, v Trigger MAIN LEVEL knob, 1-6 , 2-6 , 3-112 Slope, Delayed Trigger menu, 3-28 Tek Secure, 3-103 , G-8 TRIGGER MENU button, 3-35, 3-59 , Slope, Main Trigger menu, 3-37 Tek Secure Erase Memory, Utility...
  • Page 247 Set to Zero, 3-118 XY, Display menu, 3-33 VERTICAL MENU button, 1-9 Vertical POSITION knob, 3-116 Vertical Readout, 3-116 Vertical SCALE knob, 3-116 WARNING, statement in manual, vii Warranted Characteristics Defined, A-17 Performance Conditions for, A-17 TDS 620 & TDS 640 User Manual...

  • Page 248: Index

    Index I 10 Index...

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