Performance Verification TDS 520A, 524A, 540A, & 544A Digitizing Oscilloscopes 070-8712-01 Please check for change information at the rear of this manual. First Printing: July 1993.
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. Those manufactured in the United States have six unique digits. The country of manufacture is identified as follows: B010000 E200000 J300000 H700000 Tektronix, Inc.
WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
Welcome This is the Performance Verification for the TDS 520A, 524A, 540A, and 544A Oscilloscope. It contains procedures suitable for determining if the instrument functions, was adjusted properly, and meets the performance characteristics as warranted. Also contained in this document are technical specifications for these oscilloscopes. Related Manuals The following documents are related to the use or service of the digitizing oscilloscope.
Welcome ii Welcome
Table of Contents Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Performance Verification Procedures Brief Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Tests . . . . . . . . . . . . . . . .
Table of Contents Specifications i Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 General Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Summary Please take a moment to review these safety precautions. They are provided for your protection and to prevent damage to the digitizing oscilloscope. This safety information applies to all operators and service personnel. Symbols and Terms These two terms appear in manuals: H statements identify conditions or practices that could result in damage to the equipment or other property. H statements identify conditions or practices that could result in personal injury or loss of life.
Safety Summary Specific Precautions Observe all of these precautions to ensure your personal safety and to prevent damage to either the digitizing oscilloscope or equipment connected to it. Power Source The digitizing oscilloscope is intended to operate from a power source that will not apply more than 250 VRMS between the supply conductors or between either supply conductor and ground.
Performance Verification Procedures
Brief Procedures The Self Tests use internal routines to confirm basic functionality and proper adjustment. No test equipment is required to do these test procedures. The Functional Tests utilize the probe-compensation output at the front panel as a test-signal source for further verifying that the oscilloscope functions properly. A standard-accessory probe, included with this oscilloscope, is the only equipment required.
Brief Procedures Conventions Throughout these procedures the following conventions apply: H Each test procedure uses the following general format: Title of Test Equipment Required Prerequisites Procedure H 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. First Step a. First Substep H First Subpart H Second Subpart b. Second Substep 2.
Brief Procedures H Refer to Figure 1-1: “Main menu” refers to the menu that labels the seven menu buttons under the display; “side menu” refers to the menu that labels the five buttons to the right of the display. “Pop-up menu” refers to a menu that pops up when a main-menu button is pressed.
Brief Procedures Self Tests This procedure uses internal routines to verify that this oscilloscope functions and was adjusted properly. No test equipment or hookups are required. Verify Internal Adjustment, Self Compensation, and Diagnostics Equipment Required: None. Prerequisites: Power on the Digitizing Oscilloscope and allow a 20 minute warm-up before doing this procedure. Procedure: 1. Verify that internal diagnostics pass: Do the following substeps to verify passing of internal diagnostics. a.
Brief Procedures First, the CAL menu is displayed. Second, the adjustment sections are verified. Third, a signal path compensation is run and is verified. Figure 1-2: Verifying Adjustments and Signal-Path Compensation When doing steps f and g, do not turn off the oscilloscope until signalpath compensation completes. If you interrupt (or lose) power to the instrument while signal-path compensation is running, a message is logged in the oscilloscope error log.
Brief Procedures Functional Tests The purpose of these procedures is to confirm that this oscilloscope functions properly. The only equipment required is one of the standard-accessory probes and, to check the file system, a 3.5 inch. 720 K or 1.44 Mbyte floppy disk. These procedures verify functions; that is, they verify that oscilloscope features operate. They do not verify that they operate within limits.
Brief Procedures b. Initialize the oscilloscope: H Press save/recall SETUP. H Press the main-menu button Recall Factory Setup. H Press the side-menu button OK Confirm Factory Init. 2. Verify that all input channels operate: Do the following substeps — test CH 1 first, skipping substep a since CH 1 is already set up for verification from step 1. a. Select an unverified channel: H Press WAVEFORM OFF to remove from display the channel just verified.
Brief Procedures H Hi Res mode displays an actively acquiring waveform on-screen with the noise that was present in Sample mode reduced. H Envelope mode displays an actively acquiring waveform onscreen with the noise displayed. H Average mode displays an actively acquiring waveform onscreen with the noise reduced like in Hi Res mode. TDS 520A and 524A only: Substep e will have you repeat the previous substeps to check all input channels.
Brief Procedures e. Test all channels: Repeat substeps a through d to verify AUX 2. 4. Remove the test hookup: Disconnect the probe from the channel input and the probe-compensation terminals. Verify the Time Base Equipment Required: One P6139A probe. Prerequisites: None. Procedure: 1. Install the test hookup and preset the oscilloscope controls: a. Hook up the signal source: Install the probe on CH 1.
Brief Procedures Verify the Main and Delayed Trigger Systems Equipment Required: One P6139A probe. Prerequisites: None. Procedure: 1. Install the test hookup and preset the oscilloscope controls: a. Hook up the signal source: Install the probe on CH 1. Connect the probe tip to PROBE COMPENSATION SIGNAL on the front panel; connect the probe ground to PROBE COMPENSATION GND. (See Figure 1-3 on page 1-6.) b. Initialize the oscilloscope: H Press save/recall SETUP.
Brief Procedures b. Select the delayed trigger level menu: H Press SHIFT; then press DELAYED TRIG. H Press the main-menu button Level; then press the side-menu button Level. c. Confirm that the following statements are true: H The trigger-level readout for the delayed trigger system changes as you turn the general purpose knob. H The general purpose knob can trigger and untrigger the squarewave probe-compensation signal as you rotate it. (Leave the signal untriggered.
Brief Procedures Verify the File System (Optional on TDS 520A and 540A) Equipment Required: One P6139A probe and one 720 K or 1.44 Mbyte, 3.5 inch DOS compatible disk. You can use a disk of your own or you can use the Programming Examples Software 3.5 inch disk (Tektronix part number 063–1134–00) contained in the TDS Family Programmer Manual (Tektronix part number 070–8709–01). Prerequisites: None. Procedure: 1. Install the test hookup and preset the oscilloscope controls: a.
Brief Procedures H Press the side-menu button Save To Selected File. 2. Verify the file system works: H Press AUTOSET to restore the 500 ms time base and the five cycle waveform. H Press the main-menu button Recall Saved Setup; then press the side-menu button From File. H Turn the general purpose knob to select the file to recall. For example, if you followed the instructions above and used a blank disk, you had the TDS assign the name TEK00000.SET to your file.
Brief Procedures 1Ć14 Performance Verification Procedures
Performance Tests This subsection contains a collection of procedures for checking that TDS 520A, 524A, 540A, and 544A Digitizing Oscilloscopes perform as warranted. Since the procedures cover models with both two full-featured channels (TDS 520A and 524A) and four full-featured models (TDS 540A and 544A), instructions that apply only to one of the model types are clearly identified. Otherwise, all test instructions apply to both the two and four channel models.
Performance Tests Table 1-1: Test Equipment Item Number and Description 1 Attenuator,10X (three required) 2 Attenuator, 5X 3 Minimum Requirements Example Purpose Ratio: 10X; impedance 50 ; Tektronix part number connectors: female BNC input, 011–0059–02 male BNC output Ratio: 5X; impedance 50 ; Tektronix part number connectors: female BNC input, 011–0060–02 male BNC output Terminator, 50 Impedance 50 ; connectors: female BNC input, male BNC output 50 , 36 inch, male to male BNC connectors Si
Performance Tests Table 1-1: Test Equipment (Cont.
Performance Tests 1Ć18 Performance Verification Procedures
Performance Tests Test Record Photocopy the next four pages and use them to record the performance test results for your instrument. TDS 500A Test Record Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: RH %: Technician: Performance Test Minimum Incoming Outgoing Maximum Offset Accuracy CH1 Offset CH2 Offset CH3 Offset CH4 Offset +1 mV +100 mV +1 V – 1.6 mV – 25 mV 250 mV – __________ __________ __________ __________ __________ __________ + 1.
Performance Tests TDS 500A Test Record (Cont.) Instrument Serial Number: Temperature: Date of Calibration: Certificate Number: RH %: Technician: Performance Test Minimum Incoming Outgoing Maximum CH2 200 mV Vert scale setting, –5 Div position setting + 11.525 V __________ __________ + 11.675 V CH2 200 mV Vert scale setting, +5 Div position setting – 11.675 V __________ __________ – 11.525 V CH2 1 V Vert scale setting, –5 Div position setting + 107.450 V __________ __________ + 108.
Performance Tests TDS 500A Test Record (Cont.
Performance Tests TDS 500A Test Record (Cont.) Instrument Serial Number: Temperature: Date of Calibration: Performance Test Certificate Number: RH %: Technician: Minimum Incoming Outgoing Maximum Probe Compensator Output Signal Frequency (CH1 Freq.
Performance Tests Signal Acquisition System Checks These procedures check those characteristics that relate to the signal-acquisition system and are listed as checked under Warranted Characteristics in Section 2, Specifications. Check Accuracy of Offset (Zero Setting) Equipment Required: None. Prerequisites: The oscilloscope must meet the prerequisites listed on page 1-15. 1. Preset the instrument controls: a. Initialize the oscilloscope: H Press save/recall SETUP.
Performance Tests Follow these rules to match this procedure to the model of the oscilloscope under test: Models TDS 540A, 544A Only—When using Table 1-2 to test CH 1—CH 4; ignore the columns for AUX 1 & AUX 2 settings and limits. Model TDS 520A, 524A Only—Use Table 1-2 to test input channels; use the columns for CH 1—CH 4 when testing CH 1 and CH 2; use the columns for AUX 1 and AUX 2 when testing those channels.
Performance Tests Ignore the inactive cursor. Align the active cursor to the DC baseline (no input). Then read the offset relative to ground reference. Figure 1-4: Measurement of DC Offset Accuracy at Zero Setting Check DC Gain and Voltage Measurement Accuracy WARNING Performance of this procedure requires input voltages up to 130 VDC. Be sure to set the DC calibration generator to 0 volts before connecting, disconnecting, and/or moving the test hookup during the performance of this procedure.
Performance Tests Procedure: 1. Install the test hookup and preset the instrument controls (see Figure 1-5): DC Calibrator Output Sense HI LO Dual Banana to BNC Adapters 50 W Coaxial Cables BNC T Connector Figure 1-5: Initial Test Hookup a. Hook up the test-signal source: H Set the output of a DC calibration generator to 0 volts. H Connect the output of a DC calibration generator through a dual-banana connector followed by a 50 W precision coaxial cable to one side of a BNC T connector.
Performance Tests H Press the main-menu button Graticule; then press the side-menu button Frame. 2. Confirm input channels are within limits for DC delta voltage accuracy: Do the following substeps — test CH 1 first, skipping substep a since CH 1 is already selected from step 1. a. Select an unchecked channel: H Set the generator output to 0 V. H Press WAVEFORM OFF to remove the channel just confirmed from the display.
Performance Tests First align a cursor to the DC baseline (no input). Second align the second cursor to the DC test level that you input. Third read the results of the DC measurement here. D Figure 1-6: Measurement of the DC Accuracy for Delta Measurements e. Test all channels: Repeat substeps a through d for all four channels. 3. Reestablish the initial test hookup setup: a. Hook up the test-signal source: H Set the output of a DC calibration generator to 0 volts.
Performance Tests 4. Confirm input channels are within limits for DC accuracy at maximum offset and position: Do the following substeps — test CH 1 first, skipping substep a since CH 1 is already selected from step 3. a. Select an unchecked channel: H Press WAVEFORM OFF to remove the channel just confirmed from the display. H Press the front-panel button that corresponds to the channel you are to confirm. H Set the generator output to 0 V. H Move the test hookup to the channel you select. b.
Performance Tests Table 1-4: DC Accuracy: AUX 1–AUX 2 Scale Setting Positio n Setting (Divs) Offset Setting Generator Setting Accuracy Limits 100 mV –5 +0.5 V +1.3 V +1.271 V to +1.329 V +5 –0.5 V –1.3 V –1.271 V to –1.329 V –5 +5 V +13 V +12.710 V to +13.290 V +5 –5 V –13 V –12.710 V to –13.290 V –5 +50 V +130 V +127.10 V to +132.90 V +5 –50 V –130 V –127.10 V to –132.90 V 1V 10 V d. Display the test signal: H Press VERTICAL MENU. Press the main-menu button Position.
Performance Tests First set vertical and position offsets to maximum (no input). Note gnd 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. Figure 1-7: Measurement of DC Accuracy at Maximum Offset and Position f.
Performance Tests Check Analog Bandwidth Equipment Required: One high-frequency leveled sine wave generator and its leveling head (Item 11), plus two10X attenuators (Item 1). Prerequisites: See page 1-15. Procedure: 1. Install the test hookup and preset the instrument controls: a. Initialize the oscilloscope: H Press save/recall SETUP. H Press the main-menu button Recall Factory Setup. H Press the side-menu button OK Confirm Factory Init. b.
Performance Tests 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: H Press WAVEFORM OFF to remove the channel just confirmed from display. H Press the front-panel button that corresponds to the channel you are to confirm. H Move the leveling head to the channel you select. b.
Performance Tests e. Display the test signal: Do the following subparts to first display the reference signal and then the test signal. H Press MEASURE; then press the main-menu button Select Measrmnt for CHx. H Now press the side menu button more until the menu label Pk-Pk appears in the side menu (its icon is shown at the left). Press the side-menu button Pk-Pk. H Press CLEAR MENU.
Performance Tests g. Check against limits: H CHECK that the Pk-Pk readout on screen is within the limits listed in Table 1-5 for the current vertical scale setting. H When finished checking, set the horizontal SCALE back to the 50 ns setting. Checking each channel’s bandwidth at all vertical scale settings is time consuming and unnecessary.
Performance Tests Check Delay Between Channels Equipment Required: One medium-frequency leveled sine-wave generator (Item 10), one precision, 50 W coaxial cable (Item 4), one 50 terminator (Item 3), and a dual-input-coupler (Item 7). Prerequisites: See page 1-15. Procedure: DO NOT use the vertical position knob to reposition any channel while doing this check. To do so invalidates the test. 1. Install the test hookup and preset the instrument controls: a.
Performance Tests H Connect the coupler to both CH 1 and CH 2. 2. Confirm CH 1 through CH 4 (CH 2 for 520A and 524A) are within limits for channel delay: a. Set up the generator: Set the generator frequency to 250 MHz and the amplitude for about five divisions in CH 1. Hint: as you are adjusting the generator amplitude, push SET LEVEL TO 50% frequently to speed up the updating of the waveform amplitude on screen. TDS 520A and 524A only: Press CH 2; then skip to substep e and continue this check.
Performance Tests H Read the measurement results at the D: cursor readout, not the @: readout on screen. First, display the live/reference waveforms for channels. Note their overlapping ground reference indicators. Second, identify the time reference points of those waveforms. 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 f.
Performance Tests Time Base System Checks These procedures check those characteristics that relate to the Main and Delayed time base system and are listed as checked under Warranted Characteristics in Section 2, Specifications. Check Accuracy for Long-Term Sample Rate, Delay Time, and Delta Time Measurements Equipment Required: One time-mark generator (Item 12) and one precision coaxial cable (Item 4). Prerequisites: See page 1-15. Procedure: 1.
Performance Tests H Press TRIGGER MENU; then press the main-menu button Mode & Holdoff. Now press the side-menu button Normal. H Press SET LEVEL TO 50%. H Press horizontal MENU. Press the main-menu button Record Length; then press the side-menu button 1000 points in 20 divs. H Press the main-menu button Trigger Position. Press the sidemenu button Pretrigger; then set pretrigger to 20%: press 20, then ENTER, on the keypad. 2. Confirm Main and Delayed time bases are within limits for accuracies: a.
Performance Tests c. Check long-term sample rate and delay time accuracies against limits: CHECK that the rising edge of the marker crosses the center center horizontal graticule line at a point within graticule. See Figure 1-13. d. Check delta-time accuracy against limits: H Press the side-menu button Main Only. Set horizontal SCALE to 2 ns. H Set the output of the generator for 20 ns markers. H Press SET LEVEL TO 50%. H Press SHIFT; then ACQUIRE MENU. Next, press the main-menu button Mode.
Performance Tests Trigger System Checks These procedures check those characteristics that relate to the Main and Delayed trigger systems and are listed as checked under Warranted Characteristics in Section 2, Specifications. Check Accuracy (Time) for Pulse-Glitch or Pulse-Width Triggering Equipment Required: One medium-frequency leveled sine wave generator (Item 10), one 10X attenuator (Item 1), and one precision, 50 W, coaxial cable (Item 4). Prerequisites: See page 1-15. Procedure: 1.
Performance Tests 2. Confirm the trigger system is within time-accuracy limits for pulse-glitch or pulse-width triggering (Horizontal Scale 1 ms): v 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%. b. Set the trigger mode: Press TRIGGER MENU. Now press the mainmenu button Mode & Holdoff; then the side-menu button Normal. c.
Performance Tests First, the upper and lower limits are set so the test waveform triggers within limits. Second, a limit (here, the lower limit) is increased until triggering stops. Figure 1-15: Measurement of Time Accuracy for Pulse and Glitch Triggering 3. Confirm the trigger system is within time-accuracy limits for pulse-glitch or pulse-width triggering (horizontal scale >1 ms): a. Set upper and lower limits that ensure triggering at 250 kHz: H Press the side-menu button Upper Limit.
Performance Tests H Press the side-menu button Upper Limit; then use the general purpose knob to slowly decrease the the Upper Limit readout until triggering is lost. H CHECK that the Upper Limit readout is within 1 ms to 3 ms, inclusive. 4. Disconnect the hookup: Disconnect the cable from the generator output at the input connector of CH 1.
Performance Tests b. Initialize the oscilloscope: H Press save/recall Setup. H Press the main-menu button Recall Factory Setup. H Press the side-menu button OK Confirm Factory Init. c. Select Delayed Triggerable: H Press HORIZONTAL MENU. H Press the main-menu button Time Base. H Press the side-menu button Delayed Triggerable. 2. Confirm Main trigger system is within limits for Trigger-level/Threshold accuracy: a. Display the test signal: H Press VERTICAL MENU. Press the main-menu button Position.
Performance Tests First, set vertical offset to maximum and vertical position to –3 divisions. Second, set input equal to the offset to return the DC level to the screen. Third, push SET LEVEL to 50% and check the results in the main menu under “Level.” Figure 1-17: Measurement of Trigger-level Accuracy 3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold accuracy: a. Select the Delayed time base: H Press HORIZONTAL MENU. H Press the main-menu button Time Base.
Performance Tests H CHECK that the Level readout in the side menu is within 9.940 V to 10.060 V, inclusive. 4. Disconnect the hookup: a. First set the output of the DC calibration generator to 0 volts. b. Then disconnect the cable from the generator output at the input connector of CH 1.
Performance Tests c. Hook up the test-signal source: Medium Frequency Sine Wave Generator Output 50 W Coaxial Cables Figure 1-18: Initial Test Hookup—TDS 520A or 524A Only H TDS 520A, 524A only: Connect, through a 50 W precision coaxial cable, the signal output of a medium-frequency sine wave generator to CH 1. See Figure 1-18.
Performance Tests H Press the main-menu button High-Low Setup; then press the side-menu button Min-Max. H Press the main-menu button Select Measrmnt for Ch1. H Press the side-menu button –more– until Amplitude appears in the side menu (its icon is shown at the left). Press the side-menu button Amplitude. H Press SET LEVEL TO 50%. H Press CLEAR MENU. H Set the test signal amplitude for about three divisions on screen.
Performance Tests 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 1-20: Measurement of Trigger Sensitivity H Leave the Main trigger system triggered on the positive slope of the waveform before continuing to the next step. (The Main trigger system must be triggered to check the delayed trigger system in the next step.) c.
Performance Tests 3. Confirm the AUX Trigger input: a. Display the test signal: H Remove the 10X attenuator and reconnect the cable to CH 1. H Set the test signal amplitude for about 2.5 divisions on screen. H Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 250 mV. (Readout may fluctuate around 250 mV.) b. Check the AUX trigger source for stable triggering at limits: Do the following in the order listed. H Use the definition for stable trigger from step 2.
Performance Tests H Set the test signal amplitude for about five divisions on screen. Now fine adjust the generator output until the CH 1 Amplitude readout indicates the amplitude is 500 mV. (Readout may fluctuate around 500 mV.) H Disconnect the leveling head at CH 1 and reconnect it to CH 1 through a 5X attenuator. d. Repeat step 2, substeps b and c only, since only the 500 MHz frequency is to be checked here. 5.
Performance Tests Output Signal Checks The procedure that follows checks those characteristics of the output signals that are listed as checked under Warranted Characteristics in Section 2, Specifications. The oscilloscope outputs these signals at its front and rear panels. Check Outputs — CH 3 and Main and Delayed Trigger (TDS 540A and 544A only) Equipment Required: Two 50 W precision cables (Item 4), and one calibration generator (Item 9). Prerequisites: See page 1-15.
Performance Tests d. Modify the initialized front-panel control settings: H Set the horizontal SCALE to 200 ms. H Press SHIFT; then ACQUIRE MENU. H Press the main-menu button Mode. Then press the side-menu button Hi Res. 2. Confirm Main and Delayed Trigger outputs are within limits for logic levels: a. Display the test signal: H Press WAVEFORM OFF to turn off CH 1; then press CH 2 to display that channel. Set the vertical SCALE to 1 V. H Press TRIGGER MENU.
Performance Tests c. Check Main Trigger output against limits: H CHECK that the Ch2 High readout is Ch2 Low readout is v700 mV. w2.5 volts and that the H Press VERTICAL MENU; then press the main-menu button Coupling. Now press the side-menu button W to toggle it to the 50 W setting. H CHECK that the Ch2 High readout is Low readout v250 mV. w1.0 volt and that the Ch2 d.
Performance Tests b. Check against limits: H CHECK that the readout Ch2 Pk-Pk is between 90 mV and 110 mV, inclusive. H Press VERTICAL MENU; then press the side-menu button W to toggle to the 50 W setting. H Set vertical SCALE to 10 mV; then press CLEAR MENU. H CHECK that the readout Ch2 Pk-Pk is between 45 mV and 55 mV, inclusive. 4. Disconnect the hookup: Disconnect the cable from the generator output at the input connector of the channel last tested.
Performance Tests H Press the side-menu button OK Confirm Factory Init. c. Modify the initialized front-panel control settings: H Set the vertical SCALE to 100 mV as required. H Set the horizontal SCALE to 200 ms. H Press Set Level to 50% and use the VERTICAL POSITION knob to center the display on screen. H Press SHIFT; then ACQUIRE MENU. H Press the main-menu button Mode; then press the side-menu Average button. H Select 128 averages. On the keypad, type 128; then press ENTER. 2.
Performance Tests b. Check against limits: CHECK that the CH 1 Freq readout is within 950 Hz to 1.050 kHz, inclusive. 3. Confirm that the Probe Compensator signal is within limits for amplitude: a. Save the probe compensation signal in reference memory: H Press SAVE/RECALL WAVEFORM; then press the main-menu button Save Wfm Ch 1. H Press the side-menu button to Ref 1 to save the probe compensation signal in reference 1. H Disconnect the cable from CH 1 and the clips from the probe compensation terminals.
Performance Tests H Adjust the output of DC calibration generator until it precisely overlaps the top (upper) level of the stored probe compensation signal. (This value will be near 500 mV.) H Record the setting of the DC generator. H Adjust the output of DC calibration generator until it precisely overlaps the base (lower) level of the stored probe compensation signal. (This value will be near zero volts.) H Record the setting of the DC generator. d.
Performance Tests Option 05 Video Trigger Checks Equipment Required: PAL signal source (Item 18), 60 Hz. sine wave generator (Item 19), pulse generator (Item 20), 75 W Cable (Item 21), 75 W terminator (Item 22), 50 W cable (Item 4), 50 W terminator (Item 3). Check Video Trigger Prerequisites: See page 1-15. These prerequisites include running the signal path compensation routine. Procedure: 1. Setup digitizing oscilloscope to factory defaults by completing the following steps: a. Press save/recall SETUP.
Performance Tests 3. Check Jitter vs. Signal Amplitude a. Setup equipment for Jitter Test (See Figure 1-27). H Connect one of the rear panel composite outputs marked COMPST on the TSG121 through a 75 W cable and a 75 W terminator to the oscilloscope CH1 input. H Press the PAL signal source 100% FIELD control (the fourth TSG121 front-panel button from the left). PAL Signal Source TSG121 COMPST 75 W Cable 75 W Terminator Figure 1-27: Jitter Test Hookup b.
Performance Tests H CONFIRM that the TRIG’D LED is lit and the waveform is displayed on screen. c. Press SHIFT; then ACQUIRE MENU. d. Press the main-menu Mode. e. Select the side-menu Average. It should be already set to 16. f. Press the main-menu Create Limit Test Template. g. Press the side-menu V Limit. h. Use the keypad to set V Limit to 100 mdiv (press 100, SHIFT, m, then ENTER) i. Press the side-menu OK Store Template. j. Press MORE. k. Press the main-menu Ref1. l. Press CH1. m.
Performance Tests STOP shows the test is complete Figure 1-29: Jitter Test When Completed w. Press the main-menu Limit Test Setup. x. Toggle the side-menu Ring Bell if Condition Met to OFF. y. Toggle the side-menu Limit Test to OFF. 4. Check Triggered Signal Range. Setup oscilloscope for Triggered Signal Test. a. Press MORE. b. Press WAVEFORM OFF. c. Press HORIZONTAL MENU. d. Use the keypad to set the horizontal scale time-per-division (Horiz Scale (/div)) to 50 ms (press 50, SHIFT, m, then ENTER).
Performance Tests m. CONFIRM that the TRIG’D LED stays on and that the waveform on screen is stable. ie; does not move horizontally or vertically. Also, CONFIRM that the waveform on the screen has one positive pulse and a number of negative pulses (See Figure 1-30). Positive pulse Negative pulses Figure 1-30: Triggered Signal Range Test – 300 mV n. Use the keypad to set the fine scale to 75 mV (press 75, SHIFT, m, then ENTER). o.
Performance Tests Positive pulse Negative pulses Figure 1-31: Triggered Signal Range Test – 75 mV p. Disconnect all test equipment (TSG121) from the digitizing oscilloscope. 5. Check 60 Hz Rejection. a. Setup oscilloscope for 60 Hz Rejection Test. H Use the keypad to set the Ch1 Fine Scale to 282 mV (press 282, SHIFT m, then ENTER). H Press WAVEFORM OFF. H Press CH2. H Press VERTICAL MENU. H Use the keypad set the fine scale to 2 V (press 2, then ENTER). H Press HORIZONTAL MENU.
Performance Tests Signal Generator SG 502 50 W Cable Figure 1-32: 60 Hz Rejection Test Hookup H Adjust the SG 502 for three vertical divisions of 60 Hz signal (See Figure 1-33). The signal will not be triggered. That is, it will run free. Figure 1-33: 60 Hz Rejection Test Setup Signal c. Check 60 Hz rejection. H Use the keypad to set the the horizontal scale time-per-division (Horiz Scale (/div)) to 50 ms (press 50, SHIFT, m, then ENTER). H Reconnect the output of the signal generator (SG 502).
Performance Tests H Press VERTICAL MENU. H If needed, press the main-menu Fine Scale. H Use the keypad to set fine scale to 500 mV (press 500, SHIFT, m, then ENTER). H Connect another the PAL signal source’s composite signal con- nector (labelled COMPST on the TSG 121) through a 75 W cable and a 75 terminator to the CH2 input (See Figure 1-34).
Performance Tests Figure 1-35: 60 Hz Rejection Test Result H Disconnect all test equipment from the digitizing oscilloscope. 6. Check Line Count Accuracy. a. Setup oscilloscope for Line Count Accuracy Test. H Press WAVEFORM OFF. H Press CH1. H Press HORIZONTAL MENU. H Press the main-menu Record Length. H Press, if needed, the side-menu –more– 1 of 2. H Press the side-menu 5000 points in 100divs. H Press the main-menu Horiz Scale (/div).
Performance Tests PAL Signal Source TSG121 COMPST 75 W Cable 75 W Terminator Figure 1-36: Line Count Accuracy Test Hookup H Press the main-menu Trigger Position. H Press the side-menu to Set to 50%. H Press the main-menu Horiz Pos. H Press the side-menu to Set to 50%. H Use the HORIZONTAL POSITION knob to move the falling edge of the sync pulse to two divisions to the left of center screen (See Figure 1-37). Figure 1-37: Line Count Accuracy Test Setup Waveform H Press CURSOR.
Performance Tests H Press the side-menu V Bars. H Using the General Purpose knob, place the left cursor directly over the trigger “T” icon. H Press SELECT. H Turn the General Purpose knob to adjust the right cursor for a cursor delta reading of 6.780us. H Use the HORIZONTAL POSITION knob to position the right cursor to center screen. H Verify that the cursor is positioned on a positive slope of the burst signal (See Figure 1-38).
Performance Tests H Press the side-menu Field Rate. H Use the keypad to set the field rate to 60.05 Hz (press 60.05, then ENTER). H Press the side-menu Lines. H Use the keypad to set the field rate to 793 lines (press 793, then ENTER). H Press the side-menu Fields. H Use the keypad to set the number of fields to 1 (press 1, then ENTER). H Press the side-menu Sync Width. H Use the keypad to set the width to 400 ns (press 400, SHIFT, n, then ENTER). H Press the side-menu –more– 1 of 2.
Performance Tests c. Check Sync Duty Cycle H Connect the pulse generator (PG502) through a 50 W cable and a 50 W terminator to the oscilloscope CH1 input (See Figure 1-39). Pulse Generator PG502 50 W Cable 50 W Terminator Figure 1-39: PG502 Setup for Sync Duty Cycle Test H Turn the pulse generator OUTPUT (VOLTS) control until the signal on the oscilloscope shows a one division negative going pulse (See Figure 1-40). NOTE You may need to adjust the trigger level control to obtain a stable trigger.
Performance Tests Figure 1-40: Sync Duty Cycle Test: One-Div Neg Pulse Waveform H Turn the pulse generator PULSE DURATION variable control to adjust the negative pulse so the oscilloscope CH1 – Width measurement displays 400ns +/–10 ns. H Turn the HORIZONTAL SCALE knob to set the oscilloscope time base to 5 ms/div. H Turn the pulse generator PERIOD variable control to adjust the period until the oscilloscope CH1 Period measurement reads 21.000ms –25/+50 ns (See Figure 1-41). Read note shown below.
Performance Tests Figure 1-41: Sync Duty Cycle Test: Critically Adjusted Pulse H Press TRIGGER MENU. H Press the main-menu Type pop-up until you select Video. If the TRIG’D LED is not on, check that the CH1 – Width and CH1 Period measurements are adjusted correctly (see note above). CONFIRM that the setup is correct and the oscilloscope will trigger. H CONFIRM that the TRIG’D LED is on and the waveform is stable. H Disconnect the signal source from CH1, wait a few seconds, then reconnect the signal.
Performance Tests H Disconnect all test equipment (TSG 121) from the oscilloscope. H Press save/recall SETUP, press the main-menu button Recall Factory Setup, and the side-menu OK Confirm Factory Init.
Specifications
Specifications This subsection begins with a general description of the traits of the TDS 520A, 524A, 540A and 544A Digitizing Oscilloscopes. Three subsections follow, one for each of three classes of traits: nominal traits, warranted characteristics, and typical characteristics. General Product Description The Tektronix TDS 520A, 524A, 540A and 544A Digitizing Oscilloscopes are portable, four-channel instruments suitable for use in a variety of test and measurement applications and systems.
Specifications H Specialized display modes, such as variable persistence (with color coding on the TDS 524A and 544A), dot or vector mode, sin(x)/x or linear display filters, and, on the TDS 524A and 544A, user selectable color palettes. The “Fit to Screen” feature compresses the entire waveform record to fit on the screen. H A complement of advanced acquisition modes such as peak-detect, high-resolution, sample, envelope, and average.
Specifications General Purpose Knob Assign the general purpose knob to adjust a selected parameter function. More quickly change parameters by toggling the SHIFT button. Use the same method as for selecting a function, except the final side-menu selection assigns the general purpose knob to adjust some function, such as the position of measurement cursors on screen, or the setting for a channels fine gain.
Specifications Horizontal System There are three horizontal display modes: main only, main intensified, and delayed only. You can select among various horizontal record length settings. A feature called “Fit to Screen” allows the user to view entire waveform records within the 10 division screen area. In other words, waveforms are compressed to fit on the screen. The exception is that, with Option 1M, 50,000 point records are displayed over a 15 division time span.
Specifications Trigger System The triggering system supports a varied set of features for triggering the signal-acquisition system. Trigger signals recognized include: H Edge (main- and delayed-trigger systems): This familiar type of triggering is fully configurable for source, slope, coupling, mode (auto or normal), and holdoff. H Logic (main-trigger system): This type of triggering can be based on pattern (asynchronous) or state (synchronous).
Specifications Acquisition Control You can specify a mode and manner to acquire and process signals. H Select equivalent-time sampling on repetitive signals or interpolation of points sampled on non-repetitive signals. Both can increase apparent sample rate on the waveform when maximum real-time rates are reached. The apparent sample rate can be increased, even further, by using the FastFrameTM feature. Acquisition rates of 50,000 Frames/Second are possible using FastFrameTM.
Specifications Both H Bar and V Bar cursors can also be used to make absolute measurements; that is measurements relative to a defined level or event. For the H Bars, either cursor can be selected to read out its voltage with respect to any channels ground reference level. For the V Bars, it’s time with respect to the trigger point (event) of the acquisition, and the cursors can control the portion of the waveform on which automatic measurements are made.
Specifications self-diagnostic features built into the Digitizing Oscilloscope to aid in fault detection and servicing are also accessible using commands sent from a GPIB controller. Another standard feature is hardcopy. This feature allows you to output waveforms and other on-screen information to a variety of graphic printers and plotters from the Digitizing Oscilloscope front panel, providing hard copies without requiring you to put the Digitizing Oscilloscope into a system-controller environment.
Nominal Traits This subsection contains tables that list the electrical and mechanical nominal traits that describe the TDS 520A, 524A, 540A and 544A Digitizing Oscilloscopes. Nominal traits are described using simple statements of fact such as “Four, all identical” for the trait “Input Channels, Number of”, rather than in terms of limits that are performance requirements.
Nominal Traits Table 2-3: Nominal Traits — Time Base System Name Description Range, Sample-Rate1,3 TDS 540A, 544A Number of Channels On Sample-Rate Range 1 5 Samples/s – 1 GSamples/s 2 5 Samples/s – 500 MSamples/s 3 or 4 5 Samples/s – 250 MSamples/s Number of Channels On Sample-Rate Range 1 5 Samples/s – 500 MSamples/s 2 5 Samples/s – 250 MSamples/s Range, Sample-Rate1,3 TDS 520A, 524A Range, Equivalent Time or Interpolated Waveform Rate2,3 500 MSamples/s to 100 GSamples/s Range, Second
Nominal Traits Table 2-4: Nominal Traits — Triggering System Name Description Range, Delayed Trigger Time Delay 16 ns to 250 s Range, Events Delay 2 to 10,000,000 Range (Time) for Pulse-Glitch or PulseWidth Triggering 2 ns to 1 s Ranges,Trigger Level or Threshold Source Range Any Channel Auxiliary (TDS 540A & 544A only) V Line Video Trigger Modes of Operation (Option 05 Video Trigger) screen V Supports the following video standards: H NTSC (525/60) – 2 field mono or 8 field H PAL (625/50) –
Nominal Traits Table 2-6: Nominal Traits — Interfaces, Output Ports, and Power Fuse Name Description Interface, GPIB GPIB interface complies with IEEE Std 488–1987 Interface, RS-232 RS-232 interface complies with EIA/TIA 574 (talk only) (optional, as option 13, on TDS 520A and 540A) Interface, Centronics Centronics interface complies with Centronics interface standard C332-44 Feb 1977, REV A (optional, as option 13, on TDS 520A and 540A) Interface, Video VGA video output with levels that comply wi
Nominal Traits Table 2-7: Nominal Traits — Mechanical Name Description Cooling Method Forced-air circulation with no air filter Construction Material Chassis parts constructed of aluminum alloy; front panel constructed of plastic laminate; circuit boards constructed of glass-laminate. Cabinet is aluminum and is clad in Tektronix Blue vinyl material. Finish Type Tektronix Blue vinyl-clad aluminum cabinet Weight Standard TDS 524A and 544A Digitizing Oscilloscope 13.7 kg (30 lbs), with front cover.
Nominal Traits 2Ć14 Specifications
Warranted Characteristics This subsection lists the electrical and environmental warranted characteristics that describe the TDS 520A, 524A, 540A and 544A Digitizing Oscilloscopes. Warranted characteristics are described in terms of quantifiable performance limits which are warranted. NOTE In these tables, those warranted characteristics that are checked in the procedure Performance Verification, found in Section 1, appear in boldface type under the column Name.
Warranted Characteristics Table 2-8: Warranted Characteristics — Signal Acquisition System (Cont.) Name Description Analog Bandwidth, DC-50 W Coupled or DC-1 MW Coupled Volts/Div Bandwidth4 5 mV/div – 10 V/div DC – 500 MHz 2 mV/div – 4.98 mV/div DC – 350 MHz 1 mV/div – 1.
Warranted Characteristics Table 2-10: Warranted Characteristics — Triggering System Name Description Accuracy (Time) for Pulse-Glitch or Pulse-Width Triggering Time Range Sensitivity, Edge-Type Trigger, DC Coupled1 Accuracy 2 ns to 1 ms ns) 1.02 ms to 1 s setting) Trigger Source Sensitivity TDS 540A, 544A (CH1 – CH4) TDS 520A, 524A (CH1, CH2) 0.35 division from DC to 50 MHz, increasing to 1 division at 500 MHz TDS 520A, 524A (AUX1, AUX2) 0.55 division from DC to 50 MHz, increasing to 1.
Warranted Characteristics Table 2-11: Warranted Characteristics — Interfaces, Output Ports and Power Requirements Name Description Logic Levels, Main- and DelayedTrigger Outputs Characteristic Vout (HI) Vout (LO) Output Voltage and Frequency, Probe Compensator Limits w2.5 V open circuit; w1.0 V into a 50 W load to ground v0.7 V into a load of v4 mA; v0.25 V into a 50 W load to ground Characteristic Limits Output Voltage 0.
Warranted Characteristics Table 2-12: Warranted Characteristics — Environmental, Safety, and Reliability Name Description Atmospherics Temperature with floppy disk (optional on TDS 520A and 540A): Operating: +4_ C to +50_ C; Non-operating: –22_ C to +60_ C Temperature without floppy disk: Operating: 0_ C to +50_ C; Non-operating: –40_ C to +60_ C Relative humidity with floppy disk (optional on TDS 520A and 540A): Operating: To 80%, at or below +29_ C; Operating: To 20%, at or below +50_ C Non-operating:
Warranted Characteristics 2Ć20 Specifications
Typical Characteristics The tables in this subsection list the typical characteristics that describe the TDS 520A, 524A, 540A and 544A Digitizing Oscilloscopes. Typical characteristics are described in terms of typical or average performance. Typical characteristics are not warranted. Table 2-13: Typical Characteristics — Signal Acquisition System Name Description Accuracy, Delta Time Measurement For single-shot acquisitions using single-shot sample acquisition modes.1 Time Measurement Error ≤ .
Typical Characteristics Table 2-13: Typical Characteristics — Signal Acquisition System (Cont.) Name Description Step Response Settling Errors TDS 540A and 544A, all channels, TDS 520A and 524A, CH1, CH2 only Volts/Div Setting 1 mV/div–99.5 mV/div 100 mV/div–995 mV/div 1 V/div–10 V/div Step Amplitude Settling Error (%)3 v2 V v20 V v200 V 20 ns 100 ns 20 ms v0.5 v0.2 v0.1 v1.0 v0.5 v0.2 v1.0 v0.5 v0.
Typical Characteristics Table 2-15: Typical Characteristics — Triggering System Name Description Accuracy, Trigger Level or Threshold, DC Coupled Trigger Source Accuracy2 Any Channel Offset) + 0.3 div setting + Offset Accuracy) Auxiliary (TDS 540A & 544A only) Input, Auxiliary Trigger Trigger Marker Position, Edge Triggering mV) w The input resistance is 1.5 kW; the maximum safe input voltage is AC).
Typical Characteristics Table 2-15: Typical Characteristics — Triggering System (Cont.) Name Description Sensitivities, Pulse-Type Trigger Width and Glitch6 1.0 division with a minimum slew rate of 25 div/ms at the trigger level or the threshold crossing. For <5 nsec pulse width or rearm time, 2 divisions are required. Sensitivities, Derating Aux Channel Trig- All trigger sensitivity specifications are derated by 50% for AUX 1 and ger (TDS 520A & 524A) AUX2 inputs.
