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Tektronix 7a11, Instruction Manual, Page: 11 / 111

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Tektronix 7a11 Instruction Manual Download Page 11

ArtekMedia

Digitally signed by ArtekMedia 

DN: cn=ArtekMedia, 

o=ArtekMedia.com, ou, 

[email protected], c=US 

Date: 2008.11.16 13:33:28 -06'00'

Summary of Contents for 7a11

Page 1: ...INSTRUCTION MANUAL Serial Number a727 Tektronix Inc S W Millikan Way P 0 Box 500 Beaverton Oregon 97005 Phone 644 0161 Cables Tektronix 070 0984 00 1269...

Page 2: ...follows 1 Typed text pages are typically scanned in black and white at 300 dpi 2 Photo pages are typicallyscanned in gray scale mode at 600 dpi 3 Schematic diagram pages are typically scanned in black...

Page 3: ......

Page 4: ...OFFSET OUT 50 SZ TerminationIAdapter Environmental Probe Temperature Altitude Vibration Shock Plug In Altitude Physical Finish Dimension Weight SECTION 2 OPERATING INSTRUCTIONS General Plug In Inserti...

Page 5: ...Checks Recalibration Troubleshooting Test Equipment General Techniques Troubleshooting Basic Components TroubleshootingChart Corrective Maintenance Parts Procurement Screwdriver Requirements Soldering...

Page 6: ...L PARTS LIST MechanicalParts List Information CHANGE INFORMATION Abbreviations and symbols used in this manual are based on or taken directly from IEEE Standard 260 Standard Symbols for Units MIL STD...

Page 7: ...Fig 1 1 7A11 Amplifier 8...

Page 8: ...ther reduced by inserting a 2X attenuator in the signal path ahead of the 50 St terminationladapter Approx imate values of VSWR which can be expected under both conditionsare shown in Fig 1 4 The perf...

Page 9: ...Approximately 2 0pF 0 25nA or less at 2 5 increasing to 1 2nA or less at 5 0 0 1 division maximum measured in 7000 SeriesOscilloscope Characteristic DC Drift Drift With Time Ambient Temper ature and L...

Page 10: ...W Frequency lo MHz Power Rating ENVIRONMENTAL 1 Watt Probe Temperature Non operating Operating Altitude I Operating Non operating Vibration To 50 000feet To 15 000feet l5 minutes alongeach axis at 0 0...

Page 11: ...1 4 VSWR 1 3 1 o 1 MHz 10 MHz 100 MHz FREQUENCY 1 GHz ArtekMedia Digitally signed by ArtekMedia DN cn ArtekMedia o ArtekMedia com ou email manuals ArtekMedia com c US Date 2008 11 16 13 33 28 06 00...

Page 12: ...at any resonant point or if none at 55 C I S 400 g s 112 sine 3 shocks along each axis at 112 ms 1 ms and 2 ms duration total of 27 shocks To 50 000 feet and 5 5 Anodized aluminum front panel Characte...

Page 13: ...NOTES...

Page 14: ...this latch depressed move the Adapter out through the front of the 7Al1 as in Fig 2 2 B Uncoil the desired number of turns of cable from the cable drum and remove the Probe through the Adapter access...

Page 15: ...as specified for 7 A l I oscilloscopecombination Reduces upper frequency 3 dB limit of 7 A l I oscilloscope to 20 MHz Full bandwidth is provided if both switches are in the outward position Externall...

Page 16: ...Operating Instructions 7ATl Adapter Adapter install ring Stored Probe Inpc tAdapter Note that Probe hasI d cable men diseng i aged from Adapter nded Fig 2 2 Probe storageand removal 8...

Page 17: ...e equipped with pincher tip or hook tip for attaching Probe to cir cuitry Maximum allowable DC peak AC input is 200 volts Consult specification section for derating Ground Contact due to frequency Dep...

Page 18: ...ween grounding female thread at Retractable Hook Tip and alli gator clip 9 Alligator Clips For use with grounding leads 10 50 52 TerminationIAdapter GR to probe tip Can be used in any situation requir...

Page 19: ...kHz selected at the Cali brator and IVOLTSIDIV selected at the 7A11 a display of approximately 4 divisions appears on the CRT Adjusting the GAlN control with the oscilloscope Cali brator signal appli...

Page 20: ...the upper half of the CRT 5 Disconnect the Probe from the jack Attach the AC Coupler accessory to the Probe tip Connect the Coupler tip to the Calibrator jack and note that the 4 division square wave...

Page 21: ...in the adds 1 pF and the STORED PROBE INPUT Adapter adds 5 through 50 mV positions input capacitance is 5 8 pF In 1 2 pF Any additional devices such a s connectorsor cables the l through 1 V position...

Page 22: ...Output Amplifier where it is amplified and sent through the interconnecting plug to the oscilloscope The Output Amplifier also provides a push pull trigger signal to the oscilloscope for time base tr...

Page 23: ...nergized its contact drops to the lower position This places R12 in series be tween the probe tip and R21 At the same time it places the R 13 C13 R15 C15 R16 C16 combination in parallel with R21 The n...

Page 24: ...of the DC voltage component of the incoming signal for use in boot strappingthe Probe power supplies A detailed description of this boot strapping feature is con tained in the power supply circuit des...

Page 25: ...ource to drainor drain to sourcecurrent flow can occur in Q198 depending upon the instantaneous polarity of push pullsignals The STEP ATTEN BAL circuit is capable of applying a small voltage at the ba...

Page 26: ...tioning signal A voltage equal but opposite to that appearing at the I33124314 junction is generated by the Offset Inverter and is applied to R49 in the Probe The sum of R317 R44 R45 R46 and R47 is ap...

Page 27: ...any given switch position For example the switch is shown in the 5 mV position Dots in the 5 mV row indicatethat the switch contacts associated with cams 1 3 5 6 7 9 and 10 are closed All other cam o...

Page 28: ...Power Supply and Output Connectors schematic diagram The Power Supplies contained in the Type 7A11 are conventional series regulating types The plus and minus 7 volt supplies may be considered as an e...

Page 29: ...NOTES...

Page 30: ...should be deter mined as a part of preventive maintenance for several reasons 1 the performance of an instrument changes slightly with age use and operating conditions 2 perfor mance may be affected...

Page 31: ...this is power supply trouble which causes symptoms to occur in other wise unrelated circuits Visual Inspection In visually examiningthe equipment take special note of the area localized by evaluation...

Page 32: ...I f the device is con ducting voltage will be developed across resistances in series with it if it is open no voltage will be developed across resistances in series with it unless current is being sup...

Page 33: ...ilm and wire wound resistors are used Replacement resistors should be of the same type and must be at least as accurate as those originally contained in the circuit to maintain the performance standar...

Page 34: ...ugh Tektronix Field Offices or Representatives How ever replacements for standard electronic items can be readily obtained from local electronic parts stores When selecting replacement parts it is imp...

Page 35: ...A l l setup after 1 minute hori Polarity at 7 A l l trace mover and K431 zontal trace is visible from bottom to top a from top to bottom YES Check that the Offset is OFF doer tram move in response to...

Page 36: ...O l o I v F NO ID trace shift when witched to 50 mvf YES YES 1 I A Display much Switch Otcil 1 p e Cali lorcope Csli brator to 4 Ns brator to Ng V 4 div V display ap a p p Fig 4 3 Troubleshooting Char...

Page 37: ...will usually aid in heat trans fer on difficult connections This will decrease heating of the general area Use the extreme tip of needle nosedpliers to avoid drawing off too much heat When connecting...

Page 38: ...ws freely After removing the iron hold the component steady until the solder is firm Clip any excess wire Clean the solder area with a cotton tipped swab and flux remover 1 Except for troubleshooting...

Page 39: ...s should be avoided Use a screw driver which has a small diameter handle and use very light torque Plug In Unit Data Pin Connectors Pin connectors should not be subjected to excessive pressure repeate...

Page 40: ...ention to alignment and spacing It is recommended that repairs be done by a Tektronix Repair Center In repairing defective switches a repair kit and a skilled technician are necessary ingredients The...

Page 41: ...reviously described 2 Remove the two screws which remain in the rear plastic connector guide 3 Remove all pin connectors and cable clamps pushing the cable clamps out from the back of the board 8 Unso...

Page 42: ...Fig 4 8 Test Point locations within Plug In Unit Fig 4 9 Transistor and integrated circuitplacement within Plug In Unit 4 13...

Page 43: ...Fig 4 10 Component locations on Plug In Unit circuit board transistor side...

Page 44: ...t locations on Plug In Unit circuit board reverse side Blk vio on G Red o 1 H Re I wht n wht A n uht 3ed on whl J Blu 4 AD E A I red on wl AP Blk vio on w Fig 4 12 Wire color codes for Plug In Unit ci...

Page 45: ...NOTES s...

Page 46: ...pur poses in which case it should be duplicated to permit re taining an unmarked original copy form calibration procedure by technicians familiar with calibratingthe 7A11 Equipment Required Table 5 1l...

Page 47: ...Performance CheckICalibration 7A11 Fig 5 1 Test equi ment required See Table 5 1 8...

Page 48: ...No 067 0589 00 l1 IStored Probe Input Adapter Removable com ponent of 7A11 Amplifier l2 1TerminatiordAdapter 50 a GR to Probe Tip 7A11 Amplifier standard accessory AC Coupler 7A11 Amplifier standard...

Page 49: ...2 CheckIAdjust Transient Response Page 5 14 Adjust C134 R255 C255 C203 C245 C261 C234 at 10 mV for transient response within f2 using 5 division display of Fast Rise square wave from Type 106 Square W...

Page 50: ...put amplitude 19 Check Trigger Circuit Transient Re sponse Page 5 25 At 50 mV with Type 106Square Wave Generator Fast Rise signal applied check for abberrationswithin 6 10 peak to peak 20 Check Trigge...

Page 51: ...only Remove the left side POLARITY cover from the 7000 SeriesOscilloscope and from the 7A11 BANDWIDTH 20 MHz Amplifier VOLTSIDIV c Remove the Probe and Stored Probe Input Adapter from the 7A11 7B Seri...

Page 52: ...0 0 3 5 V None affected by Step 2 1 c ADJUS1 8 7 V 1 UST R500 ar AD If out of allowable toler 4 JUST R540 rig 5 4 as necessary to have me app cable a 1 perform Step 2 and 2 power supplies within allow...

Page 53: ...tain minimum trace shift 9 Select UP Polarity at the 7Al I 4 Usingthe front panel OSITIONcontrol set trace to graticule center 5 CHECK knob index should be within approxi mately 10 of top center 6 ADJ...

Page 54: ...uld not exceed 05 division peak to peak g Calibration Procedure only ADJUST R211 and R345 Fig 5 41 for optimum square corner and flatness Rounding overshoot and tilt should not exceed 05 division peak...

Page 55: ...explained in the MaintenanceSection CAUTION Do not remove or replace the shield with the 7A11 energized An accidental short circuit may occur Be careful while working with the dis ssembled Probe to av...

Page 56: ...least 2 5 times the indicated value NOTE The 7AI 1 gain can be calibrated with any reliable source 7000 Series Oscilloscopes are equipped with calibrators which are accurate to within 1 The A mplitud...

Page 57: ...rnally to amplifier with VOLTSIDIV switch in any of the 5 mV through 50 mV positions NOTE Y tJ7 Either the Amplitude Calibrator And Comparator accurate to within 0 25 or the 7000 SeriesOscillo scope C...

Page 58: ...o the Probe and note accompanying trace a Control settings given in Table 5 2 apply Equipment shift Trace shift should be within 0 05 division indicating required for step 11 is shown in Fig 5 9 0 25...

Page 59: ...use of the wide bandwidth of the 7A11 a com peak to peakdisplay plete check of transient response is made using a combination of methods sampling and real time in steps 12 13 and 1 12 is ysed to check...

Page 60: ...an be accomplished as follows Fully Clockwise Source Adjusted for well defined trace 1 Select Chan A mode Ext 2 Set the Chennel A mVolts1Div switch to 200 and center the Position control Switch the mV...

Page 61: ...onnector on the left and on the right side Connect the left and right side male connector to the Channel A and B inputs of the 3S1 respectively using 2 ns cables item 17 and GR to BNC female adapters...

Page 62: ...13 Note the shape of the top left corner of the put ill be used as a reference...

Page 63: ...5 mV 20 mV and 50 mV Use a 10X Attenuator at 5 mV 5X Attenuator at 20 mV and no attenuator at 50 mV I Performance Check only Move the Probe and 50 C l TerminationIAdapter to the Hi Amplitude Output o...

Page 64: ...onnect the Probe 50 2 TerminationIAdapter and 5X GR Attenuator to the Hi Amplitude Output connector of the Square Wave Generator e Adjust the Square Wave Generator Amplitude control as necessary to ob...

Page 65: ......

Page 66: ...BNC male connector to Channel A and its lower right BNC male con nector to Channel B of the 3S1 Check that the Sampling System controls remain set up a s in Table 5 5 and check that a coaxial cable r...

Page 67: ...ate to 500 ps Adjust the Type 106 Square Wave Generator to obtain a 5 division display and measure the risetime between the 10 and 90 amplitude points Determine the 7A11 rise time from Fig 5 18 Remove...

Page 68: ...PerformanceCheckICalibration 7A11 I Fig 5 18 7 A l l riratime computation chart...

Page 69: ...ctor to the 3S1 Channel A Input throu nnect the B13 connector to the Channel Set the Sampling System trace accurately to gratic Do not move th...

Page 70: ...sconnect the Probe Termination and 10X Attenua to peak tor from the Type 106 Square Wave Generator a The setup is continued from steps 15 through 18 A 21 Check Trigger Circuit Frequency Response squar...

Page 71: ...t should be set up according to step 12 b and 12 12 b Within the Plug In Extender disconnect the bottom BNC connectorson both sides c Attach the left side connector A1I to Channel A of the 3S1 using t...

Page 72: ...c PMC PO Y prec PT metal mounting hardware outside diameter oval head brass oval head steel part of pan head brass pan head steel plastic paper metal cased polystyrene precision paper tubular PTM pape...

Page 73: ...ng information in your order Part number instrument type or number serial or model number and modification number if applicable If a part you have ordered has been replaced with a new or improved part...

Page 74: ...RICAL PARTS LIST Title Page No 7 A l l PROBE 6 1 CHASSIS 6 2 ATTEN MAIN AMP Circuit Board Assembly 6 3 OFFSET Circuit Board Assembly 6 11 POLARITY Circuit Board Assembly 6 11 BANDWIDTH Circuit Board A...

Page 75: ...00 8039999 1 3pF Var Cer C6 281 0122 00 B040000 2 5 9 pF Var Cer C13 281 0151 00 BOl0100 8039999 1 3pF Var Cer C13 281 0122 00 8040000 2 5 9 pF Var Cer C15 283 0160 00 1 5 pF Cer 50 V C16 283 0202 00...

Page 76: ...se indicated a w 5 10 a w 5 Selected matched pair Selected matched pair Thermal 1 20 W Prec a w 1 20 W Prec 1120W Prec a w 1 2 k n 220 n 464 20 n 200 n Var a w a W Prec CHASSIS Capacitors Tolerance 20...

Page 77: ...00 56 n w 311 0095 00 500R Var 311 0652 00 BOl0100 0049999 2 x 5 kn Var 311 0652 01 8050000 2 x 5 kR Var 311 0955 00 2 kn Var Switches Wired or Unwired Tmnsfonner 120 0644 00 5 turns twisted bifilar...

Page 78: ...Cer 500 V 0 005 pF Cer 500 V 283 0003 00 0 01 pF Cer 150V 283 0001 00 0 005 pF Cer 500 V 283 0001 00 0 005 pF Cer 500 V 290 0177 00 8010100 8079999 1 PF Elect 50 V 290 0420 00 8080000 B089999 0 68 LF...

Page 79: ...licon Silicon Silicon Silicon Transistors Silicon Silicon Silicon Silicon 1N4372A 400 rnW 3 V 5 1N751A 400rnW 5 1V 5 1N751A 400 mW 5 1 V 5 1N751A 400 mW 5 1 V 5 Replaceable by 1N4152 Replaceable by 1N...

Page 80: ...w 315 0473 00 47 kQ 14 w 311 1004 00 20 kQ Var 315 0103 00 10 kQ 14 w Tek Spec Tek Spec Selected from MM4049 2N4261 Selected from MM4049 2N4261 Tek Spec Tek Spec High frequency High frequency Selected...

Page 81: ...Prec 321 0093 01 8080000 90 9s2 I S w Prec 321 0821 00 2 12kc a w Prec 321 0782 03 400 a w Prec 321 0782 03 40a a w Prec 322 0633 00 2 304kn aw Prec 3 17 01 03 00 8010100 8069999 10kn aw 3 15 01 03 00...

Page 82: ...w 321 0094 00 93 1 325 0051 03 18 2 317 0101 00 8010100 8069999 loon 315 0101 00 8070000 100 R 311 0534 00 500 a Var la W Prec IS w 14 w Prec Prec lla w 1 20 W Prec la w Prec IS w Prec 14 w 1 20 W Pre...

Page 83: ...w 100 k n I4 w 20 n 14 W 20 n I4 w 1 1 kQ I S w Prec 4 99 k n a w Prec 311 0496 00 0010100 8069999 2 5 kn Var 311 1226 00 8070000 2 5 kn Var 321 0168 00 549 0 I S w Prec 321 0684 00 15 k n I S w Prec...

Page 84: ...75 k n 75 kQ 8010100 8069999 10 kn Var 8070000 10 kn Var 8 2 k n 523 976 i2 150n l o n 21 5 kn 3 57 k n 3 6 kn 150n l on 1k n 475 n 523 0 180 6 8 0 270 2 3 57 k n 21 5 k n 3 6 kn 150n 10n 1 k n 801010...

Page 85: ...a r d 670 1 1 1 0 01 B 0 7 0 0 0 0 Complete B o a r d Bulb DS430 150 0057 01 BOl0100 8069999 Incandescent 7153AS15 selected DS430 150 0048 01 B070000 Incandescent 683 selected Switch Wired or Unwired...

Page 86: ...oted otherwise POLARITY UP BANDWIDTH 20 MHz STEP ATTEN BAL Adjusted for no trace shift accompanying switching between UP and INVERT VOLTSfDIV 10 mV for voltages 50 mV for waveforms VARIABLE CAL Voltag...

Page 87: ...7 A l l AMPLIFIER T h B O A R D GROUND CONNECTED TO C A S E GROUND THRU M O U N T I N G SCREW C O N T A C T S N O T E i S E E P A R T S L I S T F v n SEMICONDUCTOR TYPES...

Page 88: ...T F U K R TYPES...

Page 89: ...commonly vansr tO 1 V depsndent upon indi vidual tranirtw belw usd for 023...

Page 90: ...FOR ZI CONDULTOR TYPES REFERENCE D AGRAMS PROBE OUTPUT AMPL F E R OFFSET GENERATOR VOLTS D V SWITLH Q READOUT SEE PARTS LIST FOR EARLIER VALUES A N D SERIAL NUMBER RANGES OF PARTS MARKED WllH BLUE OUl...

Page 91: ...7 A l l AMPLIFIER p r F r n a u c h D I A G iNPUT AMPLIFIER S L L P A R T S L15T SLM CONDUCTOR SEE PAWS US1 FOR VAUlES AND S B I U RANGES OF PARIS I WllH BLUE W T L l N E...

Page 92: ......

Page 93: ...OFFSET ON Md adjusted f a 0 V at R307 R308 pncfion IVOLTAGES WAVEFORMS oMuMd unda mndanmp vmm l dwRm S E E PARTS UST FOR EARLIER VALUES AND SERIN NUMBER RANGES OF PARTS MARKED WITH B L U E OUnlNE...

Page 94: ...N O T E S i S E E P A R T S L I S T F O R I C e S E M I C O N D U C T O R T Y P E S 2 U 3 2 4 k U345 PINS 1 5 e 8 N O T CONNECTED PROBE SEE 1 R E F E R E N C E DIAGRAMS P R O B E I N P U T A M P L I...

Page 95: ...2 LL 7A11 AMPLIFIER...

Page 96: ......

Page 97: ...VOLTAGES obtained unda conditions ban T I 6 VOLTS OIV I 5 E L PARTS L15T F O R 5 4 4 0 SEMICONDUCTOR T Y P E 5...

Page 98: ......

Page 99: ...capacitor TIP retractable hook TIP hook TUBE insulating plastic ADAPTER bayonet ground LEAD ground 3 inches long LEA D ground 3 inches long threaded LEAD ground 12 inches long CLIP alligator TERMINATI...

Page 100: ...mnditionrgiven on dlwm 7 A l I AMPLIFIER...

Page 101: ...C H I COLUMN READOUT X i O X i 0 0 T R I G G E R SIGNAL F R O T O J 4 3 0 6 POWER SUPPLY 6 OUTPUT CONNEC...

Page 102: ...MBLY Part No 065 0125 00 Fig Q Index Tektronix Serial Model NO t Description No Part No Eff Disc Y 1 2 3 4 5 1 ASSEMBLY carton assembly includes 2 CASE HALF 1 END CAP rear 1 END CAP front 1 CARTON 7A1...

Page 103: ...s twss head steel wide or width l dex Tektronix SeriaVModel No t Description No Part No Eff Disc y 1 2 3 4 5 1 1 BOlOlOO B079999 1 B080000 1 2 1 PUSHBUTTON gray IDENTIFY 1 KNOB gray POSITION knob incl...

Page 104: ...ousing 213 0181 00 1 SCREW thread forming 62 x 0 375 inch PHs 4 TERMINAL pin rnounthg hardware not included w assembly 1 SCREW 1 7 2 0 2 5 82Ocsk FHS 1 KNOB red VARIABLE CAL IN knob includes 1 SETSCRE...

Page 105: ...G f l a t l a t c h detent BOLT l a t c h p l a s t i c SHIELDING GASKET SPRING f l a t s l i d i n g ground N U T BLOCK mounting hardware f o r each not included w nut block SCREW 4 40 x 0 188 inch 1...

Page 106: ...1 NUT keps 4 40 x 0 25 inch 5 SCREW 4 40 x 0 25 inch 100 csk FHS 82 407 0621 00 1 BRACKET probe r e e l mounting hardware not included wlbracket 83 211 0541 00 5 SCREW 6 32 x 0 25 inch 100 csk FHS 84...

Page 107: ...s WASHER spring tension TIP probe B O D Y HALF top BODY HALF bottom SHIELD e l e c t r i c a l CONTACT e l e c t r i c a l ground ASSEMBLY c i r c u i t board assembly includes CLIP e l e c t r i c a...

Page 108: ......

Page 109: ...a s t r i s e pulse almost equal i n amplitude t o whatever voltage i s applied a t the probe t i p Thus even i f a slowly changing DC voltage i n excess of 100 Volts has been applied t o the probe t...

Page 110: ...AND SCHEMATIC CORRECTIONS CHANGE TO C255 281 0167 00 9 45 200 V R249 321 0091 00 86 6 R R258 321 0016 00 14 3 R R259 321 0091 00 86 6 R C255 R249 R258 and R259 a r e located on the ATTEN HATN W C i r...

Page 111: ...ature dpdt 15 V DC K405 14870034 03 Armature dpdt 15 V DC K407 148 0034 03 Armature dpdt 15 V DC K411 148 0034 03 Armature dpdt 15 V DC K413 148 0034 03 Armature dpdt 15 V DC K415 148 0034 03 Armature...

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