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TLA Series Digitizing Oscilloscope Modules Service Manual

Summary of Contents for TLA Series

Page 1: ...This document applies to firmware version 1 00 and above Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you ar...

Page 2: ...eign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc 14200 SW Karl Bra...

Page 3: ...tions This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this...

Page 4: ......

Page 5: ...s Tables 1 2 Operating Information Installation 2 1 Software Installation and Removal 2 4 Operating Information 2 6 Theory of Operation Block Level Description 3 1 Performance Verification Summary Ver...

Page 6: ...on BNC Connector 6 16 Fuses 6 17 Probe Interface 6 19 Acquisition Board 6 22 Rear EMI Gaskets 6 23 Troubleshooting 6 25 Check for Common Problems 6 26 Eliminate Other Problem Sources 6 26 Troubleshoot...

Page 7: ...curacy test 4 22 Figure 4 9 Initial setup for the main trigger sensitivity test 4 23 Figure 4 10 Initial setup for the probe compensation test 4 24 Figure 5 1 Initial setup for the base calibration ad...

Page 8: ...able 1 2 Signal acquisition system 1 2 Table 1 3 Timebase system 1 5 Table 1 4 Trigger system 1 6 Table 1 5 Front Panel Connectors 1 7 Table 1 6 Environmental 1 7 Table 1 7 Certifications and complian...

Page 9: ...th ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all...

Page 10: ...sult in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING ind...

Page 11: ...of this product unless another person capable of rendering first aid and resuscitation is present Disconnect Power To avoid electric shock disconnect the main power by means of the power cord or if p...

Page 12: ...Service Safety Summary viii TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 13: ...ntly A brief description of each chapter follows H Specifications contains a product description of the DSO Module and tables of the characteristics and descriptions that apply to it H Operating Infor...

Page 14: ...anual refers to any field replaceable assembly or mechanical part specifically by its name or generically as a replaceable part In general a field replaceable part is any circuit board or assembly tha...

Page 15: ...7Dx TLA7EX Digitizing Oscillo scope Module Service Manual Provides service information for the DSO modules Isolating and correcting failures in the DSO module Performing periodic or after repair funct...

Page 16: ...Preface xii TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 17: ...enerally you should perform the adjustments and certification calibration once per year or following repairs that affect adjustment or calibration Strategy for Servicing This manual supports and conta...

Page 18: ...us by email In addition to warranty repair Tektronix Service offers calibration and other services which provide cost effective solutions to your service needs and quality standards compliance require...

Page 19: ...n 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA Web site www tektronix com Sales support 1 800 833 9200 select option 1 Service support 1 800 833 9200 select option 2 Technical support...

Page 20: ...Introduction xvi TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 21: ...d 1 M 50 inputs TLA7D2 and TLA7E2 have four channels TLA7D1 and TLA7E1 have two channels H A maximum realtime digitizing rate up to 5 GSample second with an analog bandwidth up to 1 GHz See Table 1 1...

Page 22: ...C Gain 1 5 for full scale ranges from 20 mV to 100 V 2 0 for full scale ranges 19 9 mV n Accuracy Internal Offset1 Full Scale Range Setting Offset Accuracy 10 mV 1 V 1 01 V 10 V 10 1 V 100 V 0 2 offse...

Page 23: ...ttings n Delay Between Channels Full Bandwidth 100 ps with equal full scale Range and Coupling settings Digitized Bits Number of 8 bits Effective Bits Realtime Sampling typical Input Frequency TLA7E1...

Page 24: ...10 V 100 V Range Sensitivity Full Scale Range All Channels 10 mV to 100 V6 Step Response Settling Errors typical7 The maximum absolute difference between the value at the end of a specified time inter...

Page 25: ...s to 10 MS s in a 1 2 5 5 sequence Range Realtime Sampling Rate Products Limits TLA7E1 and TLA7E2 25 MS s to 5 GS s on all channels simultaneously in a 1 2 5 5 sequence TLA7D1 and TLA7D2 25 MS s to 2...

Page 26: ...t the BNC input Sensitivities Pulse Type Trigger Width and Glitch typical 10 of full scale for vertical settings 100 mV full scale and 10 V full scale at the BNC input n Sensitivity Edge Type Trigger...

Page 27: ...Compensator output voltage in peak to peak Volts 0 5 V base top 1 into a 50 load Table 1 6 Environmental Characteristic Description Altitude Operating and Nonoperating Operating to 15 000 feet 4570 m...

Page 28: ...2 for power line harmonics EN 55011 Class A limits for conducted emissions FCC Compliance Complies with the requirements of FCC CFR 47 Part 15 Subpart B Class A for radiated and conducted emissions P...

Page 29: ...mation describes front panel connectors and indicators the power on procedure self cal self tests and instrument commands used for maintenance Installation Basic installation instructions are containe...

Page 30: ...namic Auto Configuration selected hexadecimal FF or decimal 255 the system automatically sets the address to an unused value For example if there are devices set to addresses 01 and 02 already in your...

Page 31: ...rame off 2 Insert the DSO module into the mainframe top and bottom module guides and push it partially into the mainframe Figure 2 2 Then slide the module into the mainframe as far as it will go witho...

Page 32: ...1 of the Tektronix Logic Analyzer Family Application Software CD NOTE This installation program uses parameters you supply to create a custom start up file in your hard disk directory The batch file e...

Page 33: ...the Setup exe icon to begin the installation program 7 Follow the on screen instructions to install the software on the hard disk 8 After the installation is complete go back to the TLA Performance V...

Page 34: ...when performing the procedures in this manual Figure 2 3 shows the connectors and indicators on the front panel of a four chan nel digitizing oscilloscope The two channel model looks and operates the...

Page 35: ...blinks on and then off under the following conditions H Each time communication with the digitizing oscilloscope occurs H When the Slot 0 controller asserts the Module Identification MODID line ARM D...

Page 36: ...mation to set up the window as needed H Listing Data Window The Listing Data Window displays acquired data as tabular text Each column of data represents one group of data or other logical data inform...

Page 37: ...each model The TLA7D2 and TLA7E2 models have four input channels The TLA7D1 and TLA7E1 have two input channels Input signals to be measured enter the DSO module through probes or cables connected to...

Page 38: ...enced to a 10 MHz clock provided by the mainframe Trigger The Trigger circuit produces trigger signals to control the Acquisition System timebase Trigger signals are selected from the following source...

Page 39: ...ins a 320C31 microprocessor that controls signal acquisition waveform processing and measurements Acquisition Memory addressing signals are transferred over the DSP Bus The DSP Processor System is und...

Page 40: ...Theory of Operation 3 4 TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 41: ...data reports are produced for the DSO modules as output from the performance verification and adjustment software Performance verification procedures confirm that a product meets or exceeds the perfor...

Page 42: ...e Set up test equipment Select procedure Allow all mainframes modules and equipment to warm up 30 minutes Are all certifications complete Done Is it OK with customer to remove reconnect probes from Sy...

Page 43: ...0525 XX 10 Adapter N to BNC Male type N to female BNC Tektronix part number 103 0045 XX 11 Adapter SMA to BNC Female type SMA to female BNC Tektronix part number 015 1018 XX 12 Cable precision 50 coa...

Page 44: ...alyzer mainframe with one DSO module H One P6243 or P6245 oscilloscope probe with standard accessories item 3 H One DSO probe calibration fixture item 2 H One male male BNC adapter item 4 It is assume...

Page 45: ...level test for the module refer to Figure 4 2 4 Under the Run button select One Time 5 Click the Run button then click OK to run the extended diagnostics When the instrument runs the extended diagnost...

Page 46: ...at the instrument has had a 30 minute warmup before attempting the self calibration 2 Disconnect any probes connected to the DSO module 3 Go to the System menu and select Calibration and Diagnostics 4...

Page 47: ...e these tests should be done once a year These procedures ask for the serial number of the DSO module under test Before installing the DSO module in the benchtop chassis or portable main frame record...

Page 48: ...mance verification and adjustment software automatically selects the DSO module settings and determines the results of each test The results of the tests are recorded in a temporary file and are avail...

Page 49: ...cation sequence on the DSO module when replacing any circuit board in the module If the performance verification tests fail perform the adjustment procedure as described in the Adjustment Procedures t...

Page 50: ...ck Enter to continue 10 If an instrument is being tested the program lists the different probe types available for testing Enter the appropriate number corresponding to your probe and then click Enter...

Page 51: ...w interrupts If you stop these tests using more aggressive methods you may have to reboot the instrument The results of all tests can be stored in a file on the hard disk You can view the test results...

Page 52: ...r each TLA7xx folder To conserve disk space you must occasionally delete the dlf files If any tests fail use the following steps to troubleshoot the problems 1 Check all test equipment for improper or...

Page 53: ...dule The INTERNAL_CAL test is the performance verification and adjustment software equivalent of SELF_CAL SW test name INTERNAL_CAL Equipment required None required Prerequisites Warm up time 30 minut...

Page 54: ...diagnostics pass INTERNAL_CAL test passes 1 Install the 0 1 F capacitor across the voltage reference output terminals to reduce noise DSO module CH 1 Voltage reference Dual banana to BNC adapter Preci...

Page 55: ...Figure 4 3 Power up diagnostics pass INTERNAL_CAL test passes 1 Verify that all of the prerequisites listed previously are met for the procedure WARNING These procedures use voltage levels that step t...

Page 56: ...on and adjustment software is loaded Test equipment connected as shown in Figure 4 42 Power up diagnostics pass INTERNAL_CAL test passes 1 The output frequency of the sine wave generator must maintain...

Page 57: ...ype N to BNC adapter item 16 Type N to BNC adapter item 16 BNC to BNC adapter item 4 DSO module CH 1 Figure 4 5 Using a power meter to monitor the amplitude of the sine wave generator during the analo...

Page 58: ...p time 30 minutes The logic analyzer application is not running The performance verification and adjustment software is loaded Power up diagnostics pass INTERNAL_CAL test passes 1 Verify that all of t...

Page 59: ...own in Figure 4 6 Power up diagnostics pass INTERNAL_CAL test passes 1 Use the dual input cable or a set of matched cables when running this test If you use unmatched coaxial cables the test may fail...

Page 60: ...running The performance verification and adjustment software is loaded Test equipment connected as shown in Figure 4 7 Power up diagnostics pass INTERNAL_CAL test passes Sine wave generator Type N to...

Page 61: ...up time 30 minutes The logic analyzer application is not running The performance verification and adjustment software is loaded Test equipment connected as shown in Figure 4 7 Power up diagnostics pas...

Page 62: ...running The performance verification and adjustment software is loaded Test equipment connected as shown in Figure 4 8 Power up diagnostics pass INTERNAL_CAL test passes Function generator DSO module...

Page 63: ...The performance verification and adjustment software is loaded Test equipment connected as shown in Figure 4 9 Power up diagnostics pass INTERNAL_CAL test passes Sine wave generator Type N to BNC adap...

Page 64: ...ce verification and adjustment software is loaded Test equipment connected as shown in Figure 4 10 Power up diagnostics pass INTERNAL_CAL test passes Probe compensation DSO module CH 1 Digital multime...

Page 65: ...the DSO module Alternatively you can access the module serial number through the logic analyzer application In the logic analyzer application go to the System menu select System Properties and then cl...

Page 66: ...The performance verification and adjustment software allows you to run groups of adjustments or sequences A sequence consists of one or more individual adjustments Normally you will perform a RUN FULL...

Page 67: ...to Channel Skew Adjustment CHAN_SKEW_CAL Base Calibration 6 Probe Compensation Adjustment PROBE_COMP_CAL None 1 You must complete the EXTERNAL_CAL test before running the INTERNAL_CAL test 2 You must...

Page 68: ...tification information 2 Select a full adjustment sequence 3 Connect the test equipment 4 Run each adjustment step as instructed 5 After completing all the adjustment steps view the test results to co...

Page 69: ...ment procedure Tests Possible circuit board failure 1 Base calibration adjustment EXTERNAL_CAL INTERNAL_CAL A2 Acquisition board 2 Frequency response adjustment BANDWIDTH_CAL A2 Acquisition board 3 Pu...

Page 70: ...ge reference item 7 Precision BNC cable item 12 Dual banana to BNC adapter item 6 Capacitor 0 1 F1 item 8 Prerequisites Warm up time 30 minutes Test equipment connected as shown in Figure 5 1 Power up...

Page 71: ...quisites listed previously are met for the procedure 4 Run the performance verification and adjustment software as described in Using the Software on page 4 9 Select TLA_dig then select the correct mo...

Page 72: ...pment connected as shown in Figure 5 22 Power up diagnostics pass Base Calibration completed 1 The output frequency of the sine wave generator must maintain a constant output amplitude within 0 35 dB...

Page 73: ...em 16 BNC to BNC adapter item 4 DSO module CH 1 Figure 5 3 Using a power meter to monitor the amplitude of the sine wave generator during the frequency response adjustment 1 Verify that all of the pre...

Page 74: ...e logic analyzer application is not running Test equipment connected as shown in Figure 5 2 Power up diagnostics pass Base Calibration completed 1 Verify that all of the prerequisites listed previousl...

Page 75: ...c analyzer application is not running Test equipment connected as shown in Figure 5 2 Power up diagnostics pass Base Calibration and Pulse Trigger adjustment completed 1 Verify that all of the prerequ...

Page 76: ...n completed 1 Use the dual input cable or a set of matched cables when running this test If you use unmatched coaxial cables the test may fail or may be mis calibrated due to an electrical mismatch be...

Page 77: ...unning Test equipment connected as shown in Figure 5 5 Power up diagnostics pass INTERNAL_CAL test pass Probe compensation DSO module CH 1 Digital multimeter Dual banana to BNC adapter Precision BNC c...

Page 78: ...es Service Manual Completing the Adjustment Steps After completing the adjustments obtain a copy of the test results and verify that all tests passed Run the Performance Verification Procedures to ver...

Page 79: ...g trees that use the internal self tests and DC voltage measurements to isolate faults to a faulty circuit board H Repackaging Instructions provides packaging information for shipment or storage Relat...

Page 80: ...plosion or severe burns Do not recharge crush disassemble heat above 100 C 212 F incinerate or expose the battery to water The DSO module contains one lithium battery A1U70 located on the Processor Bo...

Page 81: ...s an electrical conduction path that could cause a DSO module failure especially under high humidity conditions CAUTION Avoid the use of chemical cleaning agents that might damage the plastics and ext...

Page 82: ...parts of items bent pins broken or frayed cables and damaged connectors Replace damaged or missing parts frayed cables and defec tive circuit boards CAUTION To prevent damage to electrical components...

Page 83: ...ith defective wires or cables Chassis Dents deformations and damaged hardware Straighten repair or replace defective hardware CAUTION To prevent damage from electrical arcing ensure that circuit board...

Page 84: ...0 seconds for the majority of the alcohol to evaporate 5 Use hot 48 9_ C to 60_ C 120_ F to 140_ F deionized water to thoroughly rinse the parts 6 Dry all parts with low pressure deionized air 7 Dry a...

Page 85: ...w to replace the module ejector handles H Cover on page 6 10 describes how to replace the module cover H Processor Board on page 6 13 describes how to replace the Processor Board A1 Performance verifi...

Page 86: ...e screw heads 3 T 15 Torx tip TorxR driver bit for T 15 size screw heads 4 One half inch 1 2 nut driver Standard tool 5 One quarter 1 4 inch nut driver Standard tool 6 Soldering iron Standard tool 7 S...

Page 87: ...es NOTE The top and bottom injector ejector handles are not interchangeable The top injector ejector handle assembly has a notch on the right side and a tab on the left side the bottom injector ejecto...

Page 88: ...Use the following procedure and Figure 6 2 to remove the cover 1 Place the module on its right side power requirements label facing down 2 Remove four 4 screws that secure the rear panel to the chassi...

Page 89: ...allation process reinstall the cover exactly as described in steps 3 through 5 If the cover is not properly seated the module can be damaged when you install it in a mainframe or it will not meet EMC...

Page 90: ...d Installation Procedures 6 12 TLA Series Digitizing Oscilloscope Modules Service Manual Leave no vertical gap Make sure tab inserts into slot on rear of front panel Figure 6 3 Seating the cover on th...

Page 91: ...described in the TLA 700 Series Performance Verification and Adjustment Technical Reference 070 9776 XX When ordering a replacement or exchange processor board from Tektronix you must supply the foll...

Page 92: ...oard you must verify operation and you must perform the adjustment and Performance Verification procedures as described in this manual When ordering a replacement or exchange processor board from Tekt...

Page 93: ...serting processor board tab into front subpanel 3 Push forward on the Processor Board P1 connector To ensure proper alignment the tab must be fully inserted into the front subpanel slot 4 While holdin...

Page 94: ...lace the Probe Compensation BNC Connector Do not remove and replace the Channel 1 through 4 BNC s Use the following procedure and Figure 6 6 to remove the Probe Compensation BNC connector 1 Perform th...

Page 95: ...rocessor Board installation procedure see page 6 14 Fuses CAUTION To avoid damage to the DSO module use only replacement fuses that match the type voltage and current rating of the original fuse See t...

Page 96: ...rd Purpose F5 Processor board F1 F4 F2 F12 F13 Figure 6 7 Fuse replacement Use the following procedure and Figure 6 7 to install the fuses CAUTION To avoid damage to the DSO module use only replacemen...

Page 97: ...hree 3 screws that secure the Acquisition Board to the front panel CAUTION To avoid damage to the plastic probe adapter rings during Acquisition Board removal be sure the BNC connectors do not get cau...

Page 98: ...s Digitizing Oscilloscope Modules Service Manual Slide the tabs to unlock J1163 Plastic rings 4 Probe interface Acquisition board Probe interface Slide tabs to unlock J1163 Remove spacer posts 6 Remov...

Page 99: ...cessary turn the front panel face down and insert the plastic rings into holes in the front panel The plastic rings may already be installed if they stayed in the front panel during Acquisition Board...

Page 100: ...ard you must verify operation and perform the adjustment and Performance Verification procedures 1 Perform the Probe Interface removal procedure see page 6 19 2 Remove the RF shielding gasket from the...

Page 101: ...their sockets so the cable retainers snap into place 2 Install the RF shielding gasket onto the BNC connectors 3 Perform the Probe Interface installation procedure page 6 21 Rear EMI Gaskets You will...

Page 102: ...loscope 2 Pick up each gasket at the end where the gasket finger is formed up Then rotate the gasket on As you do this lift up any fingers that bind to the chassis or cover 3 Slide each gasket gently...

Page 103: ...me probes and other modules as the fault s source next H Do Troubleshoot the Digitizing Oscilloscope Module beginning on page 6 27 to isolate locate the failed replaceable part within the module If yo...

Page 104: ...rted make sure front of module is flush with front panel H Module failure see Troubleshoot the Digitizing Oscilloscope Module on page 6 27 or contact local Tektronix service center DSO module loses se...

Page 105: ...d to locate faults within the DSO module If you do not have a known good module and are not sure the problem is in the DSO module perform the following procedure to make sure the mainframe is not the...

Page 106: ...itions the ARM D and TRIG D indicators light for a short time after power is turned on Approximately five seconds after power on the READY indicator turns on and the remaining indicators may turn off...

Page 107: ...O module 1 Install the DSO module into a mainframe 2 Before you power on the mainframe watch the READY ARM D and TRIG D front panel indicators 3 Power on the mainframe and note how the front panel ind...

Page 108: ...rly configured mainframe During power on do LEDs light as expected Run the extended diagnostics Perform the Power Supply Troubleshooting Procedure page 6 31 Diagnostics Pass No Yes Use Table 6 6 on pa...

Page 109: ...igure 6 15 Did you find an open fuse Yes No With power off remove the oscilloscope top cover With power still off measure resistance at probe interface Figure 6 16 Is resistance within limits Yes No R...

Page 110: ...able 6 5 Power supply fault location table Open fuse Module to replace F1 12 V power supply Processor Board A1 and Acquisition Board A2 F2 5 VD power supply Processor Board A1 F4 5 2 V power supply Pr...

Page 111: ...e 6 6 can help you isolate problems to one of the two circuit boards in the module use the Removal and Installation Procedures beginning on page 6 7 to replace the faulty circuit board NOTE If there a...

Page 112: ...ACQ n n Sampler heater ACQ n n VXI Trigger Control Register ACQ n n VXI Trigger Control Functional ACQ n VXI Trigger Control Arm ACQ n n VXI Time Correlation ACQ n Control Voltage Serial Loop ACQ n n...

Page 113: ...enclose the following information H The owner s address H Name and phone number of a contact person H Type and serial number of the instrument H Reason for returning H A complete description of the se...

Page 114: ...Repackaging Instructions 6 36 TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 115: ...nplanned expenditures Product installation service Option IN Provides initial installation of the product and familiarizes new users with some of its operation features Three years of calibration serv...

Page 116: ...Options 7 2 TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 117: ...Digitizing Oscilloscope Modules Service Manual 8 1 Replaceable Electrical Parts Refer to the Replaceable Mechanical Parts chapter for a complete listing and description of replaceable parts for the D...

Page 118: ...Replaceable Electrical Parts 8 2 TLA Series Digitizing Oscilloscope Modules Service Manual...

Page 119: ...ion diagram for the DSO module Probe interface A2 Acquisition board CH 1 CH 2 CH 3 CH 4 J1153 Attenuator J101 100 Probe compensation J100 100 TLA7E2 and TLA7D2 only A1 Processor board J1 P1 J2 P2 J4 J...

Page 120: ...pensation TLA7E2 and TLA7D2 Only A1 Processor 68330 Main processor system Interface DSP Bus 68330 Bus 320C31 DSP processor system P1 P2 100 Acquisition system P2 10 MHz Trigger DSP Bus to DSP processo...

Page 121: ...45 DSO Probe Calibration Adapter 671 3930 XX Male to Male BNC Connector 103 0029 XX Certificate of Traceable Calibration TLA 7D1 or 7D2 or 7E1 or 7E2 Shipping List Tektronix Logic Analyzer Family User...

Page 122: ...nd modification if applicable At the time of your order Tektronix will determine the part number revision level needed for your product based on the information you provide Modules can be serviced by...

Page 123: ...serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entries indicates the part is good for all serial numbers 5 Qty This...

Page 124: ...AXIAL DIV 2100 EARLYWOOD DR PO BOX 547 FRANKLIN IN 46131 27264 MOLEX PRODUCTS COMPANY 2222 WELLINGTON CT LISLE IL 60532 52961 NORTHWEST STAMPING INC 86365 COLLEGE VIEW RD EUGENE OR 97405 53387 3M COMP...

Page 125: ...ARY HEXADECIMAL 100MA AT 50VDC RIGHT ANGLE 0 430 W X 0 400 H X 0 202 L 81073 94HAB16RA 7 131 3766 00 1 CONN HDR PCB MALE RTANG 1 X 2 0 1 CTR 0 318 MLG X 0 110 TAIL 30 GOLD 0 025 SQ 00779 87232 2 8 131...

Page 126: ...1 1315 01 1 CONN RF JACK BNC PNL 50 OHM FEMALE STR PELTOLA REAR PNL SILVER BRIGHT ALLOY 0 576 MLG X 0 36 24931 28JR306 1 21 367 0486 00 1 HANDLE EJECTOR INJECTOR EJECTOR ASSEMBLY TWO WIDE WITHOUT KEYI...

Page 127: ...r code Name description Qty Serial no discont d Serial no effective Tektronix part number 29 131 4619 00 2 CONN RIBBON PCB MALE RTANG 100 POS 0 050 CTR 0 307 MLG X 0 110 TAIL 4 X 25 STAGGERED PCB 2 53...

Page 128: ...rts List 10 8 TLA Series Digitizing Oscilloscope Modules Service Manual 1 2 3 4 2 5 6 7 8 9 10 11 12 13 14 15 2 16 17 18 19 20 21 20 22 23 24 25 2 20 26 27 28 29 30 Figure 10 1 Digitizing oscilloscope...

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