Digital Multimeters - DMM4020 - Stanford Product Realization Lab
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1. Digital Multimeters Tektronix DMM4020 Data Sheet DMM4020 Features amp Benefits Key Performance Specifications 9 9 Digit Resolution Basic VDC Accuracy of up to 0 015 1 yr 200 mV to 1000 V Voltage Range with up to 1 uV Resolution 200 pA to 10 A Current Range with up to 1 nA Resolution 200 Q to 100 MQ Range with up to 1 mQ Resolution CAT I 1000 V CAT II 600 V Available Functions and Features Volts Ohms and Amps Measurements True RMS AC AC DC Measurements Diode and Continuity Testing Frequency Measurements a 2x4 Ohms 4 wire Measurement Technique Dedicated DC Leakage Current Measurements Six Dedicated Buttons for Fast Access to Instrument Setups Limit Compare Mode for Pass Fail Testing Connectivity Front 2x4 Measurement Inputs RS 232 on Rear Panel for Quick PC Connectivity Includes USB to RS 232 Interface Adapter Cable Includes National Instruments LabVIEW SignalExpress TE Limited Edition for Connecting Your Bench 3 year Warranty Tektronix Data Sheet Measurements with the Push of a Button As the circuits in embedded system designs become more sophisticated you must measure a multitude of different parameters to validate your design The Tektronix DMM4020 5 5 digit bench multimeter offers a broad range of functions in one easy to use instrument Typical multimeter measurements volts ohms and amps are made with a basic VDC2. all from your PC Only Tektronix offers a connected test bench of intelligent instruments to simplify and speed debug of your complex design Performance You Can Count On In addition to industry leading service and support every DMM4020 multimeter comes backed with a three year standard warranty 1 NI LabVIEW SignalExpress supports the following Tektronix instruments MSO DPO4000 3000 2000 Series oscilloscopes TDS3000C 2000B 1000B Series oscilloscopes AFG3000 Series arbitrary function generators DMM4050 4040 4020 Series digital multimeters www tektronix com dmm 3 Data Sheet Characteristics General Specifications Triggering Description 400 ms lt 2 ms lt 1 ms TTL Levels 5 V max Min Max relative hold compare and dB functions Multiple Measurement Combinations Primary Function ACV DC AC FREQ OHMS X X X X X X X X X X X X X X X X Description 1000 V all ranges 10 on the largest ranges of all functions except continuity and diode test RS 232C RS 232 to USB Adapter cable included Voltage sei Characteristic Characteristic Description Trigger Delay 100V Setting 90 V to 110 V External Trigger Delay 120V Setting 108 V to 132 V External Trigger Jitter 220V Setting 198 V to 242 V Trigger Input 240V Setting 216 V to 264 V Trigger Output Frequency 47 Hz to 440 Hz Power Consumption 15 VA peak 10 W average Math Functions Dimensions Dimension mm in Height 88 3 46 Secondary
3. 8 0 05 0 9 0 05 0 05 0 01 750 V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 3 Uncertainty given as of reading of range 6 www tektronix com dmm Resistance Specifications are for 4 wire resistance function or 2 wire resistance with REL If REL is not used add 0 2 for 2 wire resistance plus lead resistance Characteristic Description Measurement Method Current source referenced to LO input Max Lead Resistance 10 of range per lead for 200 Q 2 KQ ranges 1 kQ 4 wire ohms per lead on all other ranges Input Protection 1000 V on all ranges Input Characteristics Range Full Scale 5 Digits 200 Q 199 999 Q 2kO 1 99999 kQ 20 KQ 19 9999 kQ 200 kQ 199 999 kQ 2MQ 1 99999 MQ 20 MQ 19 9999 MQ 100 MQ 100 000 MQ Accuracy Range 200 Q 2 KQ 20 KQ 200 kQ 2 MQ 20 MQ 100 MQ 3 Uncertainty given as of reading of range Slow 0 001 Q 0 01 Q 0 1 O 10 10 O 100 Q 1 KQ 90 days 23 C 5 C 0 02 0 004 0 015 0 002 0 015 0 002 0 015 0 002 0 03 0 003 0 2 0 003 1 5 0 004 Uncertainty 3 Resolution Medium 0 01 Q 0 1 O 10 10 Q 100 Q 1 kQ 10 KQ 1 year 23 C 5 C 0 03 0 004 0 02 0 003 0 02 0 003 0 02 0 003 0 04 0 004 0 25 0 003 1 75 0 004 Digital Multimeters Tektronix D
4. Documentation 16 4m 16 2m Run LabVIEW 8 2 ius TEK 4020 User Vivi I3 de j m M 15 8m String Measurement 15 6m gt cn E Scalar Measurement 15 4m 15 2m E FTF 15m Tek DPO3000 14 8m 14 6m gt ES DPO3052CH1 14 ae gt E DPO3052 CH1 Positiv ae 14m I l 1 1 1 1 1 1 1 I 23 0 50 100 150 200 250 300 350 400 450 468 Iteration Legend DPO3052 CH1 Positive pulse width s 1 076 1 075 1 074 E 35 1 073 E Idle lt 1072 G Logs TER A ta Snapshots 1 07 1 I I I I 1 1 1 1 I 50 100 150 200 250 300 350 400 450 474 Iteration Legend Scalar Measurement SignalExpress acquiring data from Tektronix DMM4020 and DPO3052 Connect Your Bench for Intelligent Debug Easily capture save and analyze measurement results from your multimeter with the special Tektronix Edition of National Instrument s LabVIEW SignalExpress software Every DMM4020 multimeter ships with a free copy of the Limited Edition version of SignalExpress for basic instrument control data logging and analysis The optional Professional Edition offers over 200 built in functions that provide additional signal processing advanced analysis sweeping limit testing and user defined step capabilities SignalExpress supports the range of Tektronix bench instruments enabling you to connect your entire test bench You can then access the Digital Multimeter
5. accuracy of up to 0 015 ensuring you have the performance you need for your design You can also use the DMM4020 to measure frequency and to perform continuity and diode tests This allows you to replace your counter continuity tester and DMM with one versatile instrument saving bench space and cost Measure Nanoampere Signals Measuring standby current in today s energy efficient designs requires looking at very low currents often in the microamp or nanoamp range Using a traditional multimeter for this measurement can lead to inaccurate results since they typically employ the shunt resistance technique for measuring current The DMM4020 offers an improved method for measuring low currents By using a current to voltage op amp technique the DMM4020 can make current measurements with 1 nA of resolution and with minimal loading affect on the circuit under test giving results that reflect real world operation of the device Designed to Make Your Work Easier The DMM4020 multimeter is designed with the ease of use and familiar operation you expect from Tektronix Intuitive Operation Dedicated front panel buttons provide fast access to frequently used functions and parameters reducing setup time You no longer need to search through software menus to find the function you need 2 www tektronix com dmm Limit compare mode on the DMM4020 Setup Buttons for Your Common Measurements With six setup buttons on the front pane
6. 5 0 005 3 Uncertainty given as of reading of range www tektronix com dmm 9 Data Sheet Frequency Characteristic Gate Time Measurement Method Settling Considerations Measurement Considerations Description 131 ms AC coupled input using the AC voltage measurement function When measuring frequency after a DC offset voltage change errors may occur For the most accurate measurement wait up to 1 second to allow input blocking RC time constant to settle To minimize measurement errors shield inputs from external noise when measuring low voltage low frequency signals Input Characteristics Range 100 mV to 750 V 4 5 200 kHz 1 MHz 4 Input gt 100 mV 5 Limited to 8 x 107 V Hz Continuity Characteristic Continuity Threshold Test Current Response Time Rate Maximum Reading Resolution 2 kHz 20 kHz 20 kHz 200 kHz Frequency Uncertainty 90 days 23 C 5 C 20 Hz 2 kHz 0 01 0 002 0 01 0 002 0 01 0 002 0 01 0 004 Diode Test Description Characteristic 20 Q Response Time 1mA Rate 100 S s with audible tone Maximum Reading Fast Resolution 199 99 Q 0 01 O 10 www tektronix com dmm 1 year 23 C 5 C 0 01 0 003 0 01 0 003 0 01 0 003 0 01 0 006 Description 100 S s with audible tone Fast 1 9999 V 0 1 mV Temperature Coefficient C Outside 18 28 C 0 002 0 001 0 002 0 001 0 002 0 001 0 002 0 002 Ordering Information Mo
7. MM4020 AC Current The following AC current specifications are for sinusoidal signals with amplitudes greater than 5 of range For inputs from 1 to 5 of range add an additional error of 0 1 of range Characteristic Description Input Protection Tool accessible 11 A 1000 V and 440 mA 1000 V fuses Measurement Method AC coupled true RMS Shunt Resistance 0 01 Q for 2 A and 10 A ranges 1 Q for 20 mA and 200 mA AC Filter Bandwidth 20 Hz 100 kHz Maximum Crest Factor 3 1 at Full Scale Additional Crest Factor Crest Factor 1 2 0 05 of full scale Errors lt 100 Hz Crest Factor 2 3 0 2 of full scale Only applies to non sinusoid signals Input Characteristics Range Full Scale Resolution Burden Voltage 5 Digits Slow Medium Fast 20 mA 19 9999 mA 0 1 pA 1 pA 1 pA lt 0 05 V 200 mA 199 999 mA 1 pA 10 pA 10 pA lt 0 5 V 2A 1 99999 A 10 pA 100 pA 100 pA lt 0 1 V 10A 10 0000 A 100 pA 1 mA 1 mA lt 0 5 V Accuracy Range Frequency Uncertainty 3 Temperature Coefficient C 90 days 1 year Outside 18 28 C 23 C 5 C 23 C 5 C 20 mA 20 Hz 45 Hz 1 0 05 1 25 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 200 mA 20 Hz 45 Hz 0 8 0 05 1 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 2A 20 Hz 45 Hz 1 0 05 1 25 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 10 A 20 Hz 45 Hz 1 0 1 1 25 0 12 0 015 0 005 45 Hz 2 kHz 1 0 1 0 5 0 12 0 01
8. MM4020 Fast 0 01 Q 0 1 Q 10 10 Q 100 Q 1 kQ 10 KQ Current Source 0 8 mA 0 8 mA 0 08 mA 0 008 mA 0 9 pA 0 16 pA 0 16 pA 10 MQ Temperature Coefficient C Outside 18 28 C 0 003 0 0006 0 003 0 0005 0 003 0 0005 0 003 0 0005 0 004 0 0005 0 01 0 0005 0 2 0 0005 www tektronix com dmm 7 Data Sheet DC Current Characteristic Description Input Protection Tool accessible 11 A 1000 V and 440 mA 1000 V fuses 0 01 Q for 2 A and 10 A ranges 1 Q for 20 mA and 200 mA Burden voltage lt 5 mV for 200 pA and 2 mA range Shunt Resistance Input Characteristics Range Full Scale Resolution Burden Voltage 5 Digits Slow Medium Fast 200 pA 199 999 pA 0 001 pA 0 01 pA 0 01 pA lt 5 mV 2mA 1999 99 WA 0 01 pA 0 1 pA 0 1 pA lt 5 mV 20 mA 19 9999 mA 0 1 pA 1 pA 1 pA lt 0 05 V 200 mA 19 9999 mA 1 pA 10 pA 10 pA lt 0 5 V 2A 1 99999 A 10 pA 100 pA 100 pA lt 0 1 V 10 A 10 0000 A 100 pA 1 mA 1 mA lt 0 5 V Accuracy Range Uncertainty Temperature Coefficient C 90 days 4 year Outside 18 28 C 23 C 5 C 23 C 5 C 200 pA 0 02 0 005 0 03 0 005 0 003 0 001 2mA 0 015 0 005 0 02 0 005 0 002 0 001 20 mA 0 03 0 02 0 04 0 02 0 005 0 001 200 mA 0 02 0 005 0 03 0 008 0 005 0 001 2A 0 05 0 02 0 08 0 02 0 008 0 001 10A 0 18 0 01 0 2 0 01 0 008 0 001 3 Uncertainty given as of reading of range 8 www tektronix com dmm Digital Multimeters Tektronix D
9. Width 217 8 56 Function T Depth 297 11 7 DC V X Weight kg Ib X Net 2 1 4 6 DC X Display ACI X Vacuum Fluorescent Display segment FREQ OHMS Environment i er Electrical Characteristic Description ES Characteristic eee Input Protection Operating 0 C to 50 C E Storage 40 C to 70 C ee Warm Up 2 hour to full uncertainty specifications Relative Humidity noncondensing Remote Interfaces Operating Uncontrolled lt 10 C lt 90 10 C to 28 C lt 75 28 C to 40 C lt 45 40 C to 50 C Warranty Storage lt 95 40 C to 70 C Three years Altitude Operating 2 000 meters Storage 12 000 meters Vibration Complies with MIL PRF 28800F Class 3 Safety Complies with IEC 61010 1 2001 ANSI ISA 61010 1 S82 02 01 2004 UL 61010 1 2004 CAN CSA C22 2 No 61010 1 2004 CAT 1000V CAT II 600 V EMC Designed to comply with IEC 61326 1 1997 A1 1998 A2 2000 4 www tektronix com dmm Digital Multimeters Tektronix DMM4020 Electrical Specifications DC Voltage Specifications Specifications are valid for 5 digit mode and after at least a half hour warm up Characteristic Maximum Input 1000 V on any range Common Mode 120 dB at 50 or 60 Hz 0 1 1 kQ unbalance Description Rejection Normal Mode Rejection 80 dB at Slow Rate A D Nonlinearity 15 ppm of range Input Bias Current lt 30 pA at 25 C Settling Considerations Measurement settling times are affected by source impedance cable dielect
10. dels Model Description DMM4020 5 5 Digit Multimeter DMM4020 Includes Meter TL710 test leads line cord spare line fuse statement of cal practices Warranty statement Safety and Installation Guide Connectivity Installation Manual CD ROM with user manual English French Italian German Spanish Simplified Chinese Traditional Chinese Korean Russian Japanese RS 232 to USB Adapter Cable National Instruments LabVIEW SignalExpress Tektronix Edition Limited Edition Software Please specify power plug when ordering Instrument Options Power Plug Options Option Description Opt A0 North America Opt A1 Universal Euro Opt A2 United Kingdom Opt A3 Australia Opt A5 Switzerland Opt A6 Japan Opt A10 China Opt A11 India Opt A12 Brazil Opt E1 Euro and UK power cords Digital Multimeters Tektronix DMM4020 Service Options 6 Option Description Opt CA1 Provides a single calibration event or coverage for the designated calibration interval whichever comes first Opt C3 Calibration Service 3 Years Opt C5 Calibration Service 5 Years Opt R5 Repair Service 5 Years including warranty 6 Test Leads and accessories are not covered by the DMM warranty and Service Offerings Refer to the datasheet of each Test Lead and accessory model for its unique warranty and calibration terms Recommended Accessories and Software Accessory Description Calibration Manual 077 0365 xx 196 3520 xx Premium Test Leads r
11. dwidth Common Mode Rejection Maximum Crest Factor 3 1 at Full Scale Additional Crest Factor Crest Factor 1 2 0 05 of full scale Errors lt 100 Hz Crest Factor 2 3 0 2 of full scale Only applies for non sinusoid signals Input Characteristics Range Full Scale Resolution Input Impedance 5 Digits Slow Medium Fast 200 mV 199 999 mV 1 uV 10 uV 10 uV 1 MQ 2 shunted by 2V 1 99999 V 10 pV 100 pV 100 pV lt 100 pf 20 V 19 9999 V 100 pV 1000 uV 1000 uV 200 V 199 999 V 1 mV 10 mV 10 mV 750 V 750 00 V 10 mV 100 mV 100 mV Accuracy Range Frequency Uncertainty Temperature Coefficient C 90 days 1 year Outside 18 28 C 23 C 5 C 23 C 5 C 200 mV 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 2V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 20 V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 200 V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0
12. eplacement spare for TL710 TL705 2x4 Wire Ohm 1000 V Precision Test Lead TL725 2x4 Wire Ohm SMD Test Tweezers ACD4000 Soft Transit Case HCTEK4321 Hard Carrying Case RMU2U Rackmount Shelf Kit for 1 or 2 Units 013 0369 xx Calibration Fixture 4 terminal short 196 3520 00 TL710 Premium Test Lead SIGEXPTE NI LabVIEW SignalExpress Tektronix Edition Software Full Version Tektronix is registered to ISO 9001 and ISO 14001 by SRI Quality System Registrar GPIB Product s complies with IEEE Standard 488 1 1987 and RS 232C IEEE 488 www tektronix com dmm 11 Data Sheet www tektronix com dmm Contact Tektronix ASEAN Australasia 65 6356 3900 Austria 00800 2255 4835 Balkans Israel South Africa and other ISE Countries 41 52 675 3777 Belgium 00800 2255 4835 Brazil 55 11 3759 7627 Canada 1 800 833 9200 Central East Europe and the Baltics 41 52 675 3777 Central Europe amp Greece 41 52 675 3777 Denmark 45 80 88 1401 Finland 41 52 675 3777 France 00800 2255 4835 Germany 00800 2255 4835 Hong Kong 400 820 5835 India 000 800 650 1835 Italy 00800 2255 4835 Japan 81 3 6714 3010 Luxembourg 41 52 675 3777 Mexico Central South America amp Caribbean 52 55 56 04 50 90 Middle East Asia and North Africa 41 52 675 3777 The Netherlands 00800 2255 4835 Norway 800 16098 People s Republic of China 400 820 5835 Poland 41 52 675 3777 Portugal 80 08 12370 Republic of Korea 001 800 8255 2835 Rus
13. l you can save the settings for your most common measurements Simply set up the meter for a measurement then press shift followed by a setup button to save the measurement settings Now each time you perform that measurement you simply press the appropriate setup key Dual Display With the unique dual display you can measure two different parameters of the same signal from one test connection Limit Compare The limit compare mode provides pass fail indicators to quickly show if a test passes or fails to help eliminate mistakes especially for results that are Close to the limit Simple and Accurate 4 wire Measurements Patented split terminal jacks for the 2x4 ohms function allow you to perform 4 wire measurements using only two leads instead of four Special test lead accessories are available to enable you to establish the connection You get excellent resolution and accuracy plus the convenience and ease of using a single pair of leads Easy Connectivity to Your PC The RS 232 port on the back panel can be used to connect to your PC A USB to RS 232 interface adapter cable is included standard with the DMM4020 for connecting to your PC s USB port Untitled 1 LabVIEW SignalExpress BAX File Edit View Tools AddStep Dataview Window Help Q ddStep Run RunOne Record 4 Tig Add Display A Dock Show Help RAY 22 Step Setup im Data View G Recording Options EventLog __ Project
14. ric characteristics and input signal changes Input Characteristics Range Full Scale Resolution Input Impedance 5 Digits Slow Medium Fast 200 mV 199 999 mV 1 uV 10 uV 10 uV gt 10 GO 2 2V 1 99999 V 10 uV 100 uV 100 uV gt 10 GO 2 20 V 19 9999 V 100 uV 1000 uV 1000 uV 10 MO 1 200 V 199 999 V 1 mV 10 mV 10 mV 10 MO 1 1000 V 1000 00 V 10 mV 100 mV 100 mV 10 MO 1 2 At some dual display measurements the input impedance of 200 mV and 2 V ranges may be changed to 10 MQ Accuracy Range Uncertainty Temperature Coefficient C 90 days 1 year Outside 18 28 C 23 C 5 C 23 C 5 C 200 mV 0 01 0 003 0 015 0 004 0 0015 0 0005 2V 0 01 0 002 0 015 0 003 0 001 0 0005 20 V 0 01 0 003 0 015 0 004 0 0020 0 0005 200 V 0 01 0 002 0 015 0 003 0 0015 0 0005 1000 V 0 01 0 002 0 015 0 003 0 0015 0 0005 3 Uncertainty given as of reading of range www tektronix com dmm 5 Data Sheet AC Voltage Specifications AC Voltage specifications are for AC sinewave signals gt 5 of range For inputs from 1 to 5 of range and lt 50 kHz add an additional error of 0 1 of range and for 50 kHz to 100 kHz add 0 13 of range Characteristic Description Maximum Input 750 Vems or 1000 V peak or 8 x 107 Volts Hertz product Measurement Method AC coupled true RMS Measures the AC component of input with up to 1000 VDC bias on any range 20 Hz 100 kHz 60 dB at 50 Hz or 60 Hz 1 KQ unbalance AC Filter Ban
15. s Tektronix DMM4020 xij X Microsoft Excel Book1 Joey File Edit View Insert Format Tools Data Window Help z X EDSS ARY B S ma a 2 3 de Bim B Arial 10 B 7z Uu Ei S 18 8 te tel D A ta amp I a H3 X fe A B G D F G H l J K ad I 1 Date 9 4 2009 el 2 Time 47 28 5 3 X_Dimensi Time 4 x0 0 00E 00 5 Delta X 1 6 End_of_Header X Value Comment 8 O 1 07315 9 1 1 07335 10 2 1 07438 AC Measurements I 11 3 1 07416 12 4 1 07203 13 5 1 07119 14 6 1 07327 B 7 im Hi 16 8 1 07463 78 tore FPO 18 0 1 07364 WAN i Hi Jig n tvs oh l a Ki i i 20 2 1 07233 i 21 3 1 07327 22 4 1 07255 23 5 1 07428 24 6 1 07328 25 1 07156 26 18 1 0707 27 9 1 07246 28 20 1 07528 29 2141 1 07337 P 0 32 1 07259 1 36 71 106 141 176 211 246 281 316 351 386 421 456 31 23 1 07381 i 32 24 1 07472 33 25 1 0731 34 26 1 07321 35 27 1 07424 36 28 1 07169 EEE Scalar Measurement A L rif Drawy 3 AutoShapesy a 1 amp fi 4l Bi Lg a A SF EB Ready NUM A SignalExpress used to export DMM4020 data into Excel feature rich tools packed into each instrument from one intuitive software interface This allows you to automate complex measurements requiring multiple instruments log data for an extended period of time time correlate data from multiple instruments and easily capture and analyze your results
16. sia amp CIS 7 495 7484900 South Africa 41 52 675 3777 Spain 00800 2255 4835 Sweden 00800 2255 4835 Switzerland 00800 2255 4835 Taiwan 886 2 2722 9622 United Kingdom amp Ireland 00800 2255 4835 USA 1 800 833 9200 European toll free number If not accessible call 41 52 675 3777 Updated 10 February 2011 For Further Information Tektronix maintains a comprehensive constantly expanding collection of application notes technical briefs and other resources to help engineers working on the cutting edge of technology Please visit www tektronix com Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specification and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc All other trade names referenced are the service marks trademarks or registered trademarks of their respective companies 02 Oct 2011 3MW 24431 3 Tektronix
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