Tektronix TDS 620 Manual
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Tektronix TDS 620 Manual

Tektronix TDS 620 Manual

Digitizing oscilloscopes
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Performance Verification
TDS 620 & 640
Digitizing Oscilloscopes
070-8649-00
Please check for change information at the
rear of this manual.
First Printing AUG 1992

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Summary of Contents for Tektronix TDS 620

  • Page 1 Performance Verification TDS 620 & 640 Digitizing Oscilloscopes 070-8649-00 Please check for change information at the rear of this manual. First Printing AUG 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 5 A copy of Specification , found in Appendix B of the TDS 620 and TDS 640 User Manual, is also included here as a convenient reference. The following documents are related to the use or service of the oscilloscope.
  • Page 6 Welcome...

  • Page 7: Table Of Contents

    ........1-44 Check Outputs — AUX 1 (for TDS 620) or CH 3 (for TDS 640) and Main and Delayed Trigger .
  • Page 8 Signal Acquisition System ....... Horizontal System ........Trigger System .

  • Page 9: Safety

    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 Performance Verification...
  • Page 10 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 11 Performance Verification Procedures...

  • Page 13: Brief Procedures

    Performance Verification These procedures verify both the TDS 620 and the TDS 640 Digitizing Oscilloscopes. The Self Tests use internal routines to confirm basic functionality and proper Brief Procedures adjustment. No test equipment is required to do these test procedures.

  • Page 14: Conventions

    Performance Verification Throughout these procedures the following conventions apply: Conventions Each test procedure uses the following general format: Title of Test Equipment Required Prerequisites Procedure Each procedure consists of as many steps, substeps, and subparts as required to do the test. Steps, substeps, and subparts are sequenced as follows: 1.

  • Page 15: Self Tests

    1. Verify that internal diagnostics pass: Do the following substeps to verify passing of internal diagnostics. a. Display the System diagnostics menu: Press SHIFT; then press UTILITY. Repeatedly press the main-menu button System until Diag/Err is highlighted in the pop-up menu. TDS 620 & TDS 640 Performance Verification...
  • Page 16 Performance Verification b. Run the System Diagnostics: Press the main-menu button Execute; then press the side-menu button OK Confirm Run Test. c. Wait: The internal diagnostics do an exhaustive verification of proper oscilloscope function. This verification will take up to two minutes. While it progresses, a “clock”...

  • Page 17: Functional Tests

    When you are instructed to press a menu button, the button may already be selected (its label will be highlighted). If this is the case, it is not necessary to press the button. TDS 620 & TDS 640 Performance Verification...

  • Page 18: Verify All Input Channels

    Performance Verification Verify All Input Channels Equipment Required: One P6139A or P6205 probe. Prerequisites: None. Procedure: 1. Install the test hookup and preset the oscilloscope controls: Figure 1-3: Universal Test Hookup for Functional Tests a. Hook up the signal source: Install the probe on CH 1. Connect the probe tip to PROBE COMPENSATION SIGNAL on the front panel;...

  • Page 19: Verify The Time Base

    PROBE COMPENSATION GND. (See Figure 1-3 on page 1-6.) b. Initialize the oscilloscope: Press save/recall SETUP. Press the main-menu button Recall Factory Setup; then press the side-menu button OK Confirm Factory Init. TDS 620 & TDS 640 Performance Verification...

  • Page 20: Verify The Main And Delayed Trigger Systems

    Performance Verification c. Modify default settings: Press AUTOSET to obtain a viewable, triggered display. Set the horizontal SCALE to 250 Press CLEAR MENU to remove the menus from the screen. 2. Verify that the time base operates: Confirm the following statements. a.
  • Page 21 Verify that the trigger READY indicator on the front panel flashes about once every second as the waveform is updated on-screen. 4. Remove the test hookup: Disconnect the standard-accessory probe from the channel input and the probe-compensation terminals. TDS 620 & TDS 640 Performance Verification...

  • Page 22: Performance Tests

    —Read General Instructions and Conventions starting on page 1-1. Also, if you are not familiar with operating the oscilloscope, read At a Glance in Section 3 of the TDS 620 & TDS 640 User Manual before doing any of these procedures.

  • Page 23: Equipment Required

    Female BNC to dual banana Tektronix part number Various Accuracy Banana (two re- 103-0090-00 Tests quired) Connector, BNC Male BNC to dual female BNC Tektronix part number Checking Trigger “T” 103-0030-00 Sensitivity Coupler, Dual- Female BNC to dual male Tektronix part number...
  • Page 24 Item Number and Minimum Requirements Example Purpose Description 12 Generator, Lev- 250 MHz to 500 MHz; Variable TEKTRONIX SG 504 Leveled Checking Analog eled Sine Wave, amplitude from 500 mV to 4 V Sine Wave Generator with a Bandwidth and Trig-...

  • Page 25: Signal Acquisition System Checks

    Select an unchecked channel: Press WAVEFORM OFF to remove the channel just confirmed from the display. Then, press the front-pa- nel button that corresponds to the channel you are to confirm. 1 13 TDS 620 & TDS 640 Performance Verification...
  • Page 26 Performance Verification Table 1-2: DC Offset Accuracy (Zero Setting) Vertical Scale Setting Vertical Position and Offset Accuracy Lim- Offset Setting 1 mV 100 mV Vertical position is set to 0 divisions and vertical offset to 0 V when the oscilloscope is initialized in step 1.

  • Page 27: Check Dc Gain And Voltage Measurement Accuracy

    Dual Banana to BNC Adapters Coaxial Cables BNC T Connector Figure 1-5: Initial Test Hookup a. Hook up the test-signal source: Set the output of a DC calibration generator to 0 volts. 1 15 TDS 620 & TDS 640 Performance Verification...
  • Page 28 Performance Verification Connect the output of a DC calibration generator through a dual-banana connector followed by a 50 precision coaxial cable to one side of a BNC T connector. Connect the Sense output of the generator through a second dual-banana connector followed by a 50 precision coaxial cable to the other side of the BNC T connector.
  • Page 29 3. Reestablish the initial test hookup setup: a. Hook up the test-signal source: Set the output of the DC calibration generator to 0 volts. Move the BNC T connector back to CH 1. 1 17 TDS 620 & TDS 640 Performance Verification...
  • Page 30 Performance Verification b. Initialize the oscilloscope: Press save/recall SETUP. Press the main-menu button Recall Factory Setup. Press the side-menu button OK Confirm Factory Init. c. Modify the default settings: Press SHIFT; then press ACQUIRE MENU. Press the main-menu button Mode; then press the side-menu button Average 16.
  • Page 31 DC accuracy check is failed for the current vertical scale setting of the current channel.) e. Measure the test signal: Press CLEAR MENU. Read the measure- ment results at the Mean measurement readout. See Figure 1-7. 1 19 TDS 620 & TDS 640 Performance Verification...
  • Page 32 Performance Verification First set vertical position and offsets to maximum (no input). Note CH ref indicator bounded on-screen for the offset baseline below screen. Second, input a DC level equal to the offset plus 3 divisions. Third, turn on the Measurement called mean and read the results here.

  • Page 33: Check Analog Bandwidth

    11, and set the output of the gener- ator to a reference frequency of 50 kHz.) High Frequency Sine Wave Generator Output Leveling Head Figure 1-8: Initial Test Hookup 1 21 TDS 620 & TDS 640 Performance Verification...
  • Page 34 Performance Verification 2. Confirm the input channels are within limits for analog bandwidth: Do the following substeps — test CH 1 first, skipping substeps a and b since CH 1 is already set up for testing from step 1. a. Select an unchecked channel: Press WAVEFORM OFF to remove the channel just confirmed from display.
  • Page 35 (see Figure 1-9). First, increase the reference frequency to the test frequency; then decrease the horizontal scale. Second, read the results from the readout of measurement Pk-Pk. Figure 1-9: Measurement of Analog Bandwidth 1 23 TDS 620 & TDS 640 Performance Verification...
  • Page 36 Performance Verification g. Check against limits: CHECK that the Pk-Pk readout on screen is within the limits listed in Table 1-4 for the current vertical scale setting . When finished checking, set the horizontal SCALE back to the 50 ns setting. You may skip checking the remaining vertical scale settings in Table 1-4 (skip substep, h) if this oscilloscope has performed as follows:...

  • Page 37: Check Delay Between Channels

    Connect the coupler to both CH 1 and CH 2. 1 25 TDS 620 & TDS 640 Performance Verification...
  • Page 38 Save CH 3 (for TDS 640) or AUX 1 (for TDS 620) waveform: TDS 620: Move the coupler from CH 2 to AUX 1, so that CH 1 and AUX 1 are driven. Press WAVEFORM OFF. Press AUX 1;...
  • Page 39 Third, turn on the cursor and align the V bar cursors to the time reference points. Fourth, read the results here. Figure 1-11: Measurement of Channel Delay 1 27 TDS 620 & TDS 640 Performance Verification...

  • Page 40: Time Base System Checks

    Performance Verification These procedures check the characteristics related to the Main and Delayed Time Base System time base system and are listed as checked under Warranted Characteristics Checks in Section 2, Specification. Check Accuracy for Long-Term Sample Rate, Delay Time, and Delta Time Measurements Equipment Required: One time-mark generator (Item 13) and one precision coaxial cable (Item 5).
  • Page 41 10 ms delay is entered. Fourth, the waveforms rising edge is checked to be within 4.0 horizontal divisions on the center horizontal graticule line. Figure 1-13: Measurement of Accuracy — Long-Term and Delay Time 1 29 TDS 620 & TDS 640 Performance Verification...
  • Page 42 Performance Verification c. Check long-term sample rate and delay time accuracies against limits: CHECK that the rising edge of the marker crosses the center horizontal graticule line at a point within center graticule. d. Check delta-time accuracy against limits: Press the side-menu button Main Only. Set horizontal SCALE to 2.5 ns.

  • Page 43: Trigger System Checks

    Hook up the test-signal source: Connect, through a 50 precision coaxial cable, followed by a 10X attenuator, the output of a medium- frequency leveled sine wave generator (Item 11) to CH 1. 1 31 TDS 620 & TDS 640 Performance Verification...
  • Page 44 Performance Verification 2. Confirm the trigger system is within time-accuracy limits for pulse-glitch or pulse-width triggering (Horizontal Scale 2.5 ns) : a. Display the test signal: Set the output of the sine wave generator for a 100 MHz, five-division sine wave on screen. Press SET LEVEL TO 50%.
  • Page 45 CHECK that the Lower Limit readout, after the oscilloscope loses triggering, is within 1 s to 3 s, inclusive. Use the keypad to return the Lower Limit to 500 ns and reestab- lish triggering. 1 33 TDS 620 & TDS 640 Performance Verification...

  • Page 46: Check Accuracy, Trigger-Level Or Threshold, Dc Coupled

    Performance Verification Press the side-menu button Upper Limit; then use the general purpose knob to slowly decrease the Upper Limit readout until triggering is lost. CHECK that the Upper Limit readout, after the oscilloscope loses triggering, is within 1 s to 3 s, inclusive.
  • Page 47 9.863 V to 10.137 V, inclusive. 3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold accuracy: a. Select the Delayed time base: Press HORIZONTAL MENU. Press the main-menu button Time Base. 1 35 TDS 620 & TDS 640 Performance Verification...
  • Page 48 Performance Verification Press the side-menu buttons Delayed Only and Delayed Trig- gerable. Set D (delayed) horizontal SCALE to 500 First, set vertical offset to maximum and vertical position to –3 divisions. Note the channel reference indicator is bounded on screen (baseline is off-screen).

  • Page 49: Sensitivity, Edge Trigger, Dc Coupled

    1. Install the test hookup and preset the instrument controls: a. Initialize the oscilloscope: Press save/recall SETUP. Press the main-menu button Recall Factory Setup. Press the side-menu button OK Confirm Facto- ry Init. 1 37 TDS 620 & TDS 640 Performance Verification...
  • Page 50 Performance Verification b. Modify the initialized front-panel control settings: Set the horizontal SCALE for the M (main) time base to 25 ns. Press HORIZONTAL MENU; then press the main-menu button Time Base. Press the side-menu button Delayed Only; then press the side- menu button Delayed Triggerable.
  • Page 51 (Use the side menu to switch between trigger slopes; use the TRIGGER LEVEL knob to stabilize the trigger if required.) Leave the Main trigger system triggered on the positive slope of the waveform before continuing to the next step. 1 39 TDS 620 & TDS 640 Performance Verification...
  • Page 52 Performance Verification First, set a signal with an amplitude at the minimum trigger sensitivity. Second, check for a stable trigger at both the positive and negative slope settings. Figure 1-19: Measurement of Trigger Sensitivity c. Check Delayed trigger system for stable triggering at limits: Do the following subparts in the order listed.
  • Page 53 500 mV. (Readout may fluctu- ate around 500 mV.) Press SET LEVEL TO 50%. Disconnect the leveling head at CH 1 and reconnect it to CH 1 through a 5X attenuator. 1 41 TDS 620 & TDS 640 Performance Verification...
  • Page 54 Performance Verification d. Check the Main trigger system for stable triggering at limits: Read the following definition: A stable trigger is one that is con- sistent, resulting in a uniform, regular display triggered on the selected slope (positive or negative). This display should not have its trigger point switching between opposite slopes, nor should it “roll”...
  • Page 55 Delayed triggering systems using the CH 1 input. Doing the proce- dure Check Analog Bandwidth ensures that trigger signals are coupled from all four channels. 6. Disconnect the hookup: Disconnect the cable from the channel last tested. 1 43 TDS 620 & TDS 640 Performance Verification...

  • Page 56: Output Signal Checks

    Warranted Characteristics in Section 2, Specification. The oscilloscope outputs these signals at its front and rear panels. Check Outputs — AUX 1 (for TDS 620) or CH 3 (for TDS 640) and Main and Delayed Trigger Equipment Required: Two 50 precision cables (Item 5), and one calibra- tion generator (Item 10).
  • Page 57 Press the side-menu button to select the 1 M setting. Press CLEAR MENU. CHECK that the Ch2 High readout is 2.5 volts and that the Ch2 Low readout is 0.7 volts. 1 45 TDS 620 & TDS 640 Performance Verification...
  • Page 58 Second, read the measurement results here. Figure 1-21: Measurement of Main Trigger Out Limits 3. Confirm AUX 1 (for TDS 620) or CH 3 (for TDS 640) output is within limits for gain: a. Measure gain: TDS 620: Move the precision 50 cable from the DELAYED TRIGGER OUTPUT BNC to the SIGNAL OUTPUT BNC.

  • Page 59: Check Probe Compensator Output

    Figure 1-22: Initial Test Hookup a. Hook up test-signal: Connect one of the 50 cables to CH 1. Connect the other end of the cable just installed to the female BNC to clips adapter. 1 47 TDS 620 & TDS 640 Performance Verification...
  • Page 60 Performance Verification Connect the red-coded clip on the adapter just installed to the PROBE COMPENSATION SIGNAL on the front panel; connect the black-code clip to PROBE COMPENSATION GND. b. Initialize the oscilloscope: Press save/recall SETUP. Press the main-menu button Recall Factory Setup.
  • Page 61 BNC T connector. Now connect the BNC T connector to CH 1. DC Calibrator Output Sense Dual Banana to BNC Adapters Coaxial Cables BNC T Connector Figure 1-24: Subsequent Test Hookup 1 49 TDS 620 & TDS 640 Performance Verification...
  • Page 62 Performance Verification e. Measure amplitude of the probe compensation signal: Press SHIFT; then press ACQUIRE MENU. Press the the side- menu button AVERAGE then enter 16 using the keypad or the general purpose knob. Adjust the output of DC calibration generator until it precisely overlaps the top (upper) level of the stored probe compensation signal.

  • Page 63: Specification

    Specification...

  • Page 65: General

    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 66: Menus

    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 67: Signal Acquisition System

    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 Performance Verification...

  • Page 68: Acquisition Control

    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 69: Measurement Assistance

    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 70: Display

    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 71 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 72 Specification Table 2-3: 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 73 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 TDS 620 & TDS 640 Performance Verification...
  • Page 74 Specification Table 2-7: 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 75 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 76 Specification Table 2-8: 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 – 300 MHz 1 mV/div –...
  • Page 77 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. 2 13 TDS 620 & TDS 640 Performance Verification...
  • Page 78 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 79: 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. 2 15 TDS 620 & TDS 640 Performance Verification...
  • Page 80 Specification Table 2-14: 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 81 Data is maintained by small lithium-thionyl-chloride batteries internal to the memory ICs. The amount of lithium is so small in these ICs that they can typically be safely disposed of with ordinary garbage in a sanitary landfill. 2 17 TDS 620 & TDS 640 Performance Verification...
  • Page 82 Specification 2 18 Specification...

  • Page 83: Change Information

    MANUAL CHANGE INFORMATION At Tektronix, we continually strive to keep up with the latest electronic developments by adding circuit and component improvements to our instruments as soon as they are developed and tested. Sometimes, due to printing and shipping requirements, we can not get these changes immediately into printed manuals.

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