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Tektronix 11A16 User's Manual

Contents

1. 3 sa percer 2 3 Using These Procedures 2 5 Conventions in this 2 5 Initial Mainframe Settings 2 5 Menu Selections and Measurement Techniques 2 5 A6303 Current Probe 2 6 Procedure 1 Initial Setup 2 10 Procedure 2 Enhanced Accuracy 2 11 Procedure 3 High Frequency Response 2 13 Procedure 4 Overload 2 18 Procedure 5 Input Resistance 2 20 Procedure 6 DC Balance nop 2 21 Procedure 7 Vertical 2 23 Procedure 8 Bandwidth 2 25 Procedure 9 AC Coupling 2 27 Procedure 10 2 30 Procedure 11 DC Offset Accuracy 2 34 Procedure 12 Degauss Ability 2 38 Procedure 13 Probe Calibration 2 40 Maintenance Preventive Maintenance dud ERES PURO ae ey wee re 3 1 11 16 Side Shield Removal 3 1 GICANING 2
2. Calibration Reference Voltage Current Nu Probe Hall Effect Aux Signal Amplifier NK Toget Signal To From Main rigger ol Mainframe Amplifier Display Signal Connector 2 Input Power Overload Amplifier Detector Deguass Signal Analog Circuitry Generator Digital Circuitry Front Panel Main Amplitude Control SEIN NVRAM Serial Data Channel Switch Sequence interface To From Serial Data Mainframe Figure 4 2 11A16 Detailed Block Diagram One Analog Channel Analog Circuitry The analog circuitry processes the input signal It provides attenuation and amplification to an input signal before it is passed to the mainframe Attenuators There is one attenuator for each channel Both identical attenuators are located on the Main board They provide the following functions m signal attenuation input coupling modes m calibration reference signal Attenuation of a signal is selected by activating relays that connect two attenuators in series The relays can be activated in specific combinations to produce three different attenuation factors 1 10 or 100 The input coupling mode is set with two relays on the attenuator modules The input coupling mode can be set to AC DC or OFF 4 2 Theory of Operation During calibration and Self Tests a calibration reference signal is connected to the input of the attenuator and an auxiliary 50 termination is con
3. 11A16 Service Reference REV FEB 1991 2 3 te er aera te hh a ad tt aaa ARARE a ead a EE Sam Rt tet T Dea a Oa eld OO fata atu Pt CO PO On Lat tte ay er tuum STD aes ae DeL atte tt eae cee ee eA i a IG an a E ad LNG GIA i TG MN Pic s tuu tt Ban a Le ranean hi i a i aa O a i he ek Reta Description Minimum Specification Examples of Recommended Test Equipment Test Current Loop Adapter Coaxial Cable 36 inch 2 required Coaxial Cable 42 inch 2 required Attenuator 2 5X Attenuator 5X Attenuator 10X Adapter BNC to Banana 2 required Adapter T Adapter BNC Barrel Torx Screwdriver and Tips Integrated Circuit Extracting Tool Probe calibration fixture 0 for use with 11400 and DSA600 Series Oscil loscopes 50 0 36 inch male BNC connectors 500 42 inch male BNC connectors Impedance 50 Q one male and one female BNC connector Impedance 50 one male and one female BNC connector Impedance 50 one male and one female BNC connector BNC Female to Dual Banana connector BNC T Two female and o
4. dard 3 1 Visual amp 3 2 Diagnostic Troubleshooting 3 2 KeMMel 16518 3266 ht Re ease wae erway ee 52 3 2 S oe ee eat 3 4 Extended Diagnostics ifo but RC 3 4 Enhanced Accuracy Errors 3 4 EITOF Index EE E Cashews ed 3 5 Other Messa0BS ou RE het Soh ced fed ee eds ue 3 9 Calibrating a New Configuration 3 9 Restoring Calibration Data 3 9 Conventional Troubleshooting 3 10 Front Panel Connector Troubleshooting 3 10 Fuse Troubleshooting x32 X4 Re RE Ra ee Need er denne es 3 10 Darlington NPN or PNP Power Transistor Troubleshooting 3 10 Panel Connector Troubleshooting 3 10 Relay Troubleshooting 3 10 Jumper Troubleshooting 3 10 Field Replaceable Unit FRU 3 11 Abbreviations of FRU Names 3 11 Abbreviations of Component Names 3 11 Ordelirig PANS etl Lee PERF RICE 3 12 Static Sensitive Device Classificat
5. Peak Peak A AAA Topline Total Peak for Either Figure 2 2 Measurement of Plug in Contribution to Aberrations Checks and Adjustments 11 16 Service Reference Procedure 3 High Frequency Response Step 3 Repeat Step 1 beginning with the Mainframe Vert Size setting and proceeding through Step 2 in this procedure until all CH 1 Deflection Factors in Table 2 3 are examined for aberrations Do not change the Calibration Generator Pulse Amplitude instead use the attenuator specified in the second column of Table 2 3 Step 4 Press the CH 1 Display on off button off Press the CH 2 Display on off button on Step 5 Verify CH 2 by moving the Voltage Adapter and cable to CH 2 and repeating Step 1 through Step 3 in this procedure Vert Size Attenuator Peak Peak to Peak Deflection Between Pulser Amplifier Amplifier Factor and Adapter Aberrations Aberrations 100 mV div none 5 8 50 mV div none 4 5 7 20 mV div 2 5X 4 596 796 10 mV div 5X 4 596 796 5 mV div 10X 4 596 7 96 2 mV div 10X 4 2 5 X 4 596 796 1 mV div 10X 5X 4 596 796 This aberration percentage does not include the mainframe aberration 2 15 Procedure 3 High Frequency Response Setup to Check Amplifier Bandwidth Voltage Adapter Mainframe Leveled Sine Wave Generator 42 inch Coaxial Cable Steps Necessary to Check Amplifier Bandwidth The specifications for Amplifier Bandwidth
6. 2 Fully wrap the 11A16 with anti static sheeting to protect its finish 3 Tightly pack 3 inches of dunnage or urethane foam between the carton and the 11A16 to cushion it 4 Seal the carton with shipping tape or with industrial staples 9 Mark the adaress of the Tektronix service center and your retum address on the carton 1 5 1 6 Instrument Options Your 11A16 may be equipped with one or more options A brief description of the available options follow For further information and prices see your Tektronix Product Catalog or contact your local Tektronix service center Option 20 adds two A6302 Current probes General Information Checks and Adjustments This section contains procedures that allow you to examine measurement limits and electrical specifications of the 11A16 Two Channel Current Amplifier Procedures 1 13 see Table 2 1 are intended to return the 11 16 to proper operation following repair or to serve as part of a routine maintenance program To ensure accurate operation of the 11A16 check the electrical adjustment after each 2 000 hours of operation or every 24 months if you use the 11A16 infrequently Refer to the 11416 User Reference for more information about specifications and amplifier operation If an A6303 Current probe is to be used the following procedures you should first calibrate it using the procedure on page 2 6 To verify that the instrument is functioning perform the proc
7. specific SMPLHD failure is determined by decoding the Actual data produced by the diagnostic test Decoding is discussed below f both SMPLHD boards have failures the 501 is suspect Decoding an SMPLHD Failure The Actual data accompanying an X1311 error code can be decoded to identify the suspect Sample and Hold board The Actual data is hexadecimal hex number Convert this hex number to binary then determine which bits are 1 Table 3 3 shows the suspect board and the board pin number for the failed ACVS channel Refer to Figure 3 2 to locate a failed SMPLHD board The hex data code 0040 is equivalent to the binary 0000 0000 0100 0000 The single 1 is in Binary Bit position 6 which points to the SMPLHD2 board If both SMPLHD boards have failures this would point to the SDI IC or other common circuitry Maintenance Table 3 3 Sample and Hold Board Failure Codes m E EA EOT OS REEE O ITERE EEEE EEEE O OA PA a ae strane B ERA R aA e A E REA a E Ea E R S EA AEREE A A a A ANE E R a e P E R a a eA Binary Bit Suspect SMPLHD FRU Board Pin 15 SMPLHD2 20 14 SMPLHD2 22 13 SMPLHD1 20 12 SMPLHD1 22 11 SMPLHD2 19 10 SMPLHD2 23 9 SMPLHD1 19 8 SMPLHD1 23 7 SMPLHD2 17 6 SMPLHD2 14 5 SMPLHD1 17 4 SMPLHD1 14 3 SMPLHD2 15 2 SMPLHD2 16 1 SMPLHD1 15 0 SMPLHD1 16 11 16 Service Reference 3 7 Table 3 4 lis
8. 671 1451 01 Attenuator Board 1 4 671 1451 01 Attenuator Board A2 670 9336 00 Front Panel Board A3 670 9336 00 Front Panel Board REV JUL 1991 Replaceable Parts Code 0435 0860 1163 1326 1465 1572 TK1689 TK1943 TK1967 0JRO5 OKBO1 OKBO5 03888 04713 12327 2K262 22526 22599 5 400 66302 71400 73743 8 345 80009 83385 83486 92101 93907 CROSS INDEX CODE NUMBER MANUFACTURER Manufacturer LEWIS SCREW CO LABEL GRAPHICS POLYCAST INC NORTHWEST FOURSLIDE INC BEAVERTON PARTS MFG CO RAN ROB INC AROMAT CORP NEILSEN MANUFACTURING INC SYNDETEK TRIQUEST CORP STAUFFER SUPPLY NORTH STAR NAMEPLATE KDI ELECTRONICS MOTOROLA INC SEMICONDUCTOR PRODUCTS SECTOR FREEWAY CORP BOYD CORP DU PONT E I DE NEMOURS AND INC DU PONT ELECTRONICS DEPT AMERACE CORP ESNA DIV TRIAX METAL PRODUCTS INC DIV OF BEAVERTON PARTS MFG CO VLSI TECHNOLOGY INC BUSSMANN DIV OF COOPER INDUSTRIES INC FISCHER SPECIAL MFG CO NORTHWEST SPRING amp MFG CO TEKTRONIX INC MICRODOT MFG INC GREER CENTRAL DIV ELCO INDUSTRIES INC SCHULZE MFG TEXTRON INC CAMCAR DiV 11 16 Service Reference Address 4300 S RACINE AVE 6700 SW BRADBURY CT 9898 SW TIGARD ST 18224 SW 100TH CT 1800 NW 216TH AVE 631 85TH AVE 10400 N TANTAU AVE 3501 PORTLAND ROAD NE 3915 E MAIN 3000 LEWIS AND CLARK HWY 810 SE SHERMAN 1281 5 NE 25TH 60 S JEFFERSON RD 50
9. 3 18 J L Tang Slot at Bottom Figure 3 4 Proper Orientation of the Current Probe Connector Step 3 Replace the four Torx head screws that secure the connector and nut plate to the front subpanel Step 4 Reconnect the 10 pin connector to its receptacle on the Main board Step 5 Connect the coaxial cable with a yellow stripe to the appropriate Attenuator board and connect the coaxial cable with no stripe to the Main board Ensure that the center conductor of the coaxial wire is straight If necessary straighten the conductor with clean pliers to avoid contamination Step 6 Reconnect the multi pin connectors from the Front Panel boards to the Main board Step 7 Replace the Front Panel See Removing Replacing the Front Panel REV FEB 1991 Maintenance Orange gt Shield y Insulated Blue White with Blue Stripe Yellow REII REARED Capacitor Shield Insulated Nut Plates Shield insulated Solder Lug Back View of Front Panel v Without Cables Blue Cable with Blue with Yellow Stripe Peltola Connector Cable with Peltola Connector To Main Board To Attenuator Board Wiring of Front Panel Connectors Viewed From Back of Connector Figure 3 5 installation Wiring for Current Probe Connector 11A16 Service Reference REV FEB 1991 3 19 3 20 Removing Replacing a Darlington Power Transistor To check the transistors in circuit ensure tha
10. 5 214 1280 00 1 SPRING HLCPS 0 14 OD X 1 126 L TWIST LOOP 8X345 ORDER BY DESC 6 214 1054 00 1 SPRING FLAT 0 825 X 0 322 SST TK1326 ORDER BY DESC 7 105 0075 00 1 BOLT LATCH 7A amp 7B SER PL IN 80009 105007500 8 333 3790 00 1 PANEL FRONT 11A16 OKBOS ORDER BY DESC ATTACHING PARTS 9 211 0392 00 4 SCREW MACHINE 4 40 X 0 25 FLH STL T 8 93907 ORDER BY DESC END ATTACHING PARTS 10 348 0235 00 1 SHLD GSKT ELEK FINGER 4 734 L 92101 ORDER BY DESC 11 386 5219 00 1 SUBPANEL FRONT 11A44 TK1465 ORDER BY DESC 12 670 9336 00 2 CIRCUIT BD ASSY FRONT PANEL 80009 670933600 SEE A2 A3 EXCHANGE ITEM 13 610 0777 00 2 CONNECTOR ASSY 11A16 80009 610077700 A1J1001 A1J1002 ATTACHING PARTS 14 210 0405 00 2 2 56 X 0 188 BRS 73743 12157 50 15 211 0413 00 12 SCREW MACHINE 2 56 X 0 375 FLH 82 DEG STL 93907 221 00995 024 END ATTACHING PARTS 16 210 0259 00 2 TERMINAL LUG 0 099 ID LOCKING BRS TK1572 ORDER BY DESC 17 386 6023 00 PLATE CONN MT ALUMINUM 1943 ORDER BY DESC 18 174 0159 00 2 CA ASSY SPELEC 6 26 AWG 3 0 L RIBBON TK1967 ORDER BY DESC A1J1040 A1J1080 19 426 2061 00 1 FR SECT PLUG IN LOWER ALUMINUM TK1465 ORDER BY DESC 20 211 0392 00 2 SCREW MACHINE 4 40 X 0 25 FLH STL T 8 93907 ORDER BY DESC END ATTACHING PARTS 21 334 3540 00 1 MARKER IDENT MARKED WARNING TKO860 ORDER BY DESC 22 151 0391 00 2 TRANSISTOR DARLINGTON PNPSI 04713 MPS U95 A1Q601 A1Q691 342 0937 00 INSULATOR XSTR BERGQUIST SIL PA
11. Li E gt 7 3 4 44 PR ws LE m D at Be tx f E A 652 1 2 ae M P em ee 2 4 4 if 16 3 e gt ity a E M DIE 4 2 Ve i a err s 5 4 s Cd fa 5 ore 4 4 poss ae 4 Mainframe Compatibility The 11A16 amplifier is designed for use in 11300 11400 DSA 600 and some CSA Series mainframes it is not compatible with 11800 Series mainframes Many performance parameters such as vertical accuracy and some functions such as channel deskew depend on the mainframe and probes used Detailed performance specifications for different systems are included in the System Specifications section at the end of this manual Mainframe Firmware The 11A16 Amplifier will work best when your mainframe has an updated firmware version However your mainframe will operate properly with the 11A16 when the firmware versions listed in Table1 1 are installed in your mainframe atta NP NATUS uttter utet ttftt tata ERAEN a EA EER REE O E OOE SE EEEE Pa fat etat atate ta deut atetatstataty atatat peg Patet TET Suns e eT re a tata ATi Tala Ma ora aT me amparo Praia a arate a es I CdA QURE LR IRR OOo le MP IS 113
12. PR LOG INTERNAL USE ONLY DO NOT WRITE BELOW THIS LINE
13. Procedure 4 Overload Observe major menu status of Coupling 11400 or Input Parameters DSA 600 as you connect the Voltage Adapter coaxial cable from the power supply to the CH 1 input Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Examine that Coupling changes to Off Disconnect the power supply at the input Repeat Steps 2 through 5 for the CH 2 input Set the Coupling for CH1 and CH 2 to DC Set Vert Size to 2 U div Set the power supply output to 12 V Connect the power supply to the CH 1 input using the 42 inch coaxial cable Step 11 Step 12 Step 13 Step 14 Examine that Coupling changes to Off Disconnect the power supply at the input Set the CH 2 Display on off to on Repeat Steps10 through13 for the CH 2 input 2 19 Procedure 5 This procedure shows the setup and lists the steps necessary to check input Input Resistance resistance Its purpose is to verify that input resistance is within the proper range Specification Input resistance is 50 within 1 5 0 75 Setup to Check Input Resistance Voltage Adapter BNC T Adapter Mainframe Input Sense Digital Multimeter KD 42 inch Coaxial Cables Procedure to Check Input Resistance Step 1 First Initialize the mainframe settings then perform the following settings in the order listed Mainframe Center Plug in CH 1 Display on off Digital multimeter DMM Resistance MOOG ono s
14. maintenance To clean or inspect the internal boards of the 11A16 you must remove its side shields 11A16 Side Shield Removal The side shields top and bottom frames and front panel reduce radiation of electromagnetic interference EMI from the 11A16 They also reduce the amount of dust reaching the interior Therefore when you are not maintaining the 11A16 keep the side shields in place Remove a side shield as follows Step 1 Pry the side shield from the rear of the 11416 Step2 Liftup on the shield Step3 Gently remove the shield from the grooves in the frame and front panel Install a side shield as follows Step 1 Position the shield over the frame grooves Step2 Slide the front lip of the side shield under the front panel Step 3 Press down on the shield until it snaps into place Pressure must be applied along the full length of the frames to secure the shield Note that the 11A16 will not slide into the mainframe if the side shields are not fully seated in the frames Cleaning Use anti static protection to prevent static damage to components The 11A16 should be cleaned as often as operating conditions require Dirt on a component acts as an insulating blanket and prevents efficient heat dissipation Dirt also provides an electrical conduction path which may cause the 11416 to fail Diagnostic Troubleshooting Exterior dust can be removed with a soft cloth or small brush A
15. retain this return spring Step 2 Remove the four Torx head screws two on the bottom and two on the top of the front panel that secure the front subpanel to the top and bottom frames Step3 Pull the release bar out of the 11416 as far as possible Leave the release bar in this position Step4 Insert a slender sharp tool such as a scribe between the subpanel at the notch around the release bar and the front panel Step 5 Carefully separate the front panel from the subpanel Do not bend the front panel it is intentionally bowed at the center Step 6 Remove the front panel from the 11A16 3 21 3 22 Torx Head Screws 2 D Top View of 11A16 Torx Head Screws 2 Pt Ax Bottom View of 11A16 Release Bar Return Spring Figure 3 6 Removing Replacing the Front Panel Retainer Screws Replace the front panel as follows L C L Step 1 Ensure that the four screws that secure the front subpanel to the top and bottom frames are removed Step 2 Ensure that the release bar return spring is removed Step 3 Position the 11A16 its side with the front panel facing towards you Step 4 Pull the release bar out of the 11A16 as far as possible and then leave the release bar in this position Step 5 Position the front panel so that the notch in the bottom fits over the release bar rod then carefully insert the four front pane tabs into the
16. 1 MANUAL TECH SERVICE REFERENCE 11A16 80009 070776400 11 16 Service Reference REV JUL 1991 5 577 N UNS S N g X NN SC aM 4 6 N NSW N W 9 NS N NN NN X XN W NN NON S PG NN S 5 DEAN WS cem N 3 PAN X S AN M 4 d x x M N SN Nx s s N N NN B ok N A NN 3 N N NOW A N Figure 5 1 Exploded View of the 11 16 Two Channel Current Amplifier 5 6 Replaceable Parts Tektronbpc REVISION INFORMATION Manual Part 070 7764 00 _ First Printing January 199 Product rvice Manual Revised Manual Insert Status DATE CHANGE REFERENCE STATUS 12 MAR 92 C6 0392 Effective Page 1 of 1 TEE 0 4 m j ix x S MMe y E e 7 E i RE ee M n MIC c cer ee n t e 4 4 SS E E 1 4 4 42 PS T EN Sel 4 b d H t ay s Po a LS trus tr PI She GERA e 4 PA DU i s a EC coa z 6221 E j L 97 w 9 4 t Sq P a frt Di 4 i ES A e H D s t gt i M GS amt r ar
17. Cia pa MR Huet FP Cal Refs ROUNE FP 10 000 V al P EH Tr rp touch Step 2 Record the DMM absolute value Step3 Select Exit Step 4 Select FP 9 9951 V 2 30 Checks and Adjustments 11 16 Service Reference Procedure 10 AV DC Accuracy Step 5 Select Run Step 6 Record the DMM absolute value Step 7 Select Exit Step 8 Select Exit Diagnostics LJ E Step 9 Add the DMM absolute values of the readings obtained in Steps 2 and 6 Divide the result by 19 9951 V to obtain the mainframe calibration voltage reference characterization factor This factor is used in the Procedure to Test the Amplifier Steps Necessary to Characterize the DSA 600 Series Mainframe Step 1 Set the following parameters Center crew ce erac ces eee no setting changes Digital multimeter DMM ais eee E a ee lariat Gs cede quate DC dem ite m ee ted S gi e Auto Range 10 V Mainframe UTILITY major menu Calibrator mine e EE DC Adjust Adjust amplitude to 10 V Step 2 Record the DMM absolute value Step 3 Adjust Amplitude to 9 9951V Step 4 Record the DMM absolute value Step 5 Add the DMM absolute values of the readings obtained in Steps 2 and 4 Divide the result by 19 9951 V to obtain the mainframe calibration voltage reference cha
18. Replacing a Pin Jumper Three jumpers J980 J990 and J992 are installed in the 11A16 for normal operation See Figure 3 2 for the location and standard configuration of these jumpers All jumpers should normally be installed across Pins 2 and 3 Removing Replacing a Relay The relays K1 K4 are located on the Attenuator board Refer to Figure 3 3 it may be necessary to remove the top side rail to access the pins of a suspect relay Refer to Removing Replacing the Main board on page 3 28 Remove a Relay as follows Step 1 Desolder the Relay from the Attenuator board Replace a Relay as follows Step 1 Orient pin 1 of the Relay the end with a white bar toward the square circuit pad before soldering 11A16 Service Reference 3 31 Removing Replacing a DIP FRU IC The Main board has several dual inline package DIP ICs that are replaceable in the field For Hypcon IC replacement refer to Removing Replacing the Hypcon Assembly earlier in this section Observe all the special precautions mentioned under Static Sensitive Device Classification on page 3 12 Avoid touching the IC or the socket contacts with your fingers as finger oils can lessen reliability Do not remove the label affixed to the top of any EPROM Removing this label will allow light into the IC which may erase data This also removes critical firmware version information If you are required to desolder an IC from the Main board it is suggested
19. To ensure proper functioning and extended operation of the 11A16 operate and store the 11A16 within the following environments a Operate the 11A16 in a mainframe where the ambient air temperature is between 0 50 Store the 11 16 in ambient temperatures from 40 to 75 After storing the 11A16 at temperatures outside the operating limits allow the 11A16 to reach the safe operating temperature before applying power Enhanced system accuracy is available after a 20 minute warmup period If the mainframe is in the Enhanced Accuracy state and the internal temperature of the mainframe changes 5 C the mainframe reverts to normal accuracy If you are shipping the 11A16 to your local Tektronix service center for repair attach a tag to the instrument with the following information Name and address of the 11A16 owner m Name of a person at your firm who be contacted about the 11A16 m 11A16 type and serial number m Description of the service required Save and reuse the original carton and packaging when shipping the 11A16 by commercial transportation Be sure to package and ship the 11A16 and mainframe separately If the original package is not available or is not reusable package the 11A16 as follows 1 Obtain a corrugated cardboard carton with dimensions at least six inches 15 cm greater than the 11A16 dimensions Use a carton with a bursting test strength of at least 200 pounds per square inch
20. begins normal operation Restoring Calibration Data If the mainframe is powered off during probe calibration Self Tests Extended Diagnostics or other system calibration or evaluation activity internal NVRAM data can be corrupted If the Extended Diagnostic menu is displayed after power on then this corruption might be the cause of the apparent failure If the Extended Diagnostics menu displays a Cksm Probe error use the following procedure to restore normal operation Step 1 Recalibrate the probes Step 2 Execute the Self Tests and confirm that the tests pass If the Extended Diagnostics menu again displays a Cksm Probe error or any new error then use the following procedure to restore normal operation Step 3 Exit the Extended Diagnostic menu Step 4 Wait for self calibration to complete and pass Step 5 Execute the Self Tests and confirm that these tests pass If this procedure does not restore normal operation the 11A16 requires repair 11A16 Service Reference 3 9 Conventional Troubleshooting This section lists faulty FRUs and symptoms that power on diagnostics can not detect After determining the suspect FRU refer to Table 3 8 to locate the appropriate technique s to replace it Front Panel Connector Troubleshooting A faulty Front Panel Connector Cable assembly could cause a communication loss between the Front Panel board and the Main board Fuse Troubleshooting To find a def
21. brush is particularly useful for dislodging dirt in and around the front panel switches Remove the side shields before cleaning Interior cleaning of the 11A16 is seldom required If the interior of the 11A16 accumulates dust or dirt clean with dry low velocity air Remove stubborn dirt with a soft brush or a cloth dampened with a mild detergent and water solution A cotton tipped applicator is useful for cleaning in narrow spaces or for cleaning delicate components Finally remove any cleaning residue by wiping with a damp washcloth To prevent damage from electrical shorts the boards and components must be dry before applying power Visual Inspection The 11A16 should be inspected occasionally for loosely seated or heat damaged components The corrective procedure for most visible defects is replacement of ihe part Particular care must be taken if heat damaged parts are found since overheating usually indicates other problems The mainframe automatically performs a series of diagnostic tests when it is powered on and the microprocessor unit MPU is reset The first set of diagnostic tests are the Kernel Tests which determine if the 11A16 kernel systems are operating properly If these are successful then the Self Tests are executed to verify the functionality of the 11A16 subsystems Any failure causes the mainframe to enter Extended Diagnostics and to display the error index code s in a diagnostic menu The Kernel test
22. di 2 4 tebii s 4 PCM SV E m 4 i xut eer uer UE NENNEN EM M es pe A mane cti er a 2 F pager ei Das Te TES ci ALR OR ae ere Cat AN SA QS A SA m ERAI MOE A WII ape aes FRET Ra SOE IIR RR E n we jes ge Ee ra i ia a N a n GT WT tet a 2 ADD MAR 92 SEND TO TEKTRONIX INC __ 11000 SERIES OSCILLOSCOPE LAB INSTRUMENTS MARKETING SUPPORT BOX 500 DEL STA 39 327 _ PROBLEM REPORT BEAVER F N OREGON 97077 290 SUDICI JVE INSTRUMENT CONFIGURATION 2 g ags sr2eb eadow Koo COAT eer Instrument ROM Version ID Serial Number ES 2 EA SA moo oti lis nso war c neNovni Nog cs Acie Meo o Oni us symewesen t 16 Sv az 2220670 emr 3860 5 X aeb 27 52080 be FE een WE AC 13237 ez 0 VON 9t Ts OT IC SIS AEL geat VES T i 1 as ak d He 97 Option Information bra exar to qd COMPANY NA
23. front panel of the 11A16 is flush with the front panel of the mainframe Remove the 11A16 from a 11000 or DSA 600 Series Mainframe as follows Step 1 Set the mainframe ON STANDBY switch to STANDBY Step 2 Pull the release latch see Fig 1 1 to disengage the 11A16 from the mainframe _ Step 3 Slide the 11A16 straight out of the plug in compartment 11000 DSA600 or CSA400 Series Mainframe Top Groove Bottom Guide Release Latch Figure 1 1 installing and Removing the 11A16 1 4 General Information Memory Backup Power for the 11A16 Operating Environment Packaging for Shipment 11 16 Service Reference The nonvotatile RAM NVRAM within the 11A16 allows the data in memory to be retained when the 11A16 is powered down and removed The NVRAM stores system configuration data such as the 11A16 mainframe and probe identification numbers as well as the calibration constants The data that the NVRAM stores enable the 11A16 to resume Enhanced Accuracy performance see your mainframe User Reference for Enhanced Accuracy operation from a powered off condition without performing a full calibration Enhanced Accuracy operation The rated lifetime of the NVRAM intemal power source is ten years If the 11A16 habitually loses Enhanced Accuracy status without a system configuration change that is the 11A16 remains plugged into the same slot in the same mainframe then you may need to replace the NVRAM
24. menu Frequency Adjust Amplitude ee am a a 4 b o 9 9 9 c 35 9 Digital multimeter DMM MOO aos roh uh Coa aces Eros sudo eats DC acpe ae e TP P ata eaters eee ee Auto Step 2 Record the DMM absolute value Step 3 Adjust Amplitude to 9 9951V Step 4 Record the DMM reading Step 5 Add the DMM absolute values of the readings obtained in Steps 2 and 4 Divide the result by 19 9951 V to obtain the mainframe calibration voltage reference characterization factor 2 35 Procedure 11 DC Offset Accuracy Setup to Check the 11A16 DC Offset Accuracy Voltage Adapter Mainframe BNC to Banana Adapter Coaxial Cable P DC Voltage sa 1 Calibrator e M gital e ultimeter BNC to Banana J 6 c and BNC T Adapters T LO 6 Coaxial Cable Steps Necessary to Check the 11A16 DC Offset Accuracy Step 1 First Initialize the mainframe settings then perform the following settings in the order listed DC Voltage Calibrator OMS anD oos ee PRSE E ORE TEE East bas on SESRG o M on QPU 22955 24 eae Center plug in CH 1 Display on off ER aed eee on Mainframe WAVEFORM major menu 11400 BW Limit 20 MHz DSA600 Input Parameters touch Bandwidth suu er entre ERAS deor ied 20 MHz Acquire Desc
25. position of the multi pin connector index triangle to ensure that this connector can be correctly replaced Step 2 Remove the two Torx head screws that secure the Front Panel board to the front subpanel Step 3 Remove the Front Panel board To replace the Front Panel board perform the previous steps in the reverse order Removing Replacing a Fuse See Figure 3 2 FRU locator for fuse locations A fuse will usually fail only when a Darlington transistor has failed Remove fuses as follows Step 1 Desolder the faulty fuse from the Main board Step 2 Resolder the correct value of fuse to the Main board Step3 When fuse is blown it is likely that one or both Darlington power transistors will be faulty Troubleshoot these before continuing The only function of these fuses is to supply current to the Darlington transistors and protect associated circuitry from excessive current flow Removing Replacing the IC Heatsink Bracket See Figure 3 8 for screw locations Remove and replace the heatsink bracket as follows Step 1 Remove the four Torx head screws that secure the plastic rear panel to the top and bottom frames Step 2 Carefully press the rear panel lock pin out of the alignment hole in the Main board and remove the plastic rear panel from the 11A16 Step 3 Remove the two Torx head screws that secure the heatsink bracket to the Main board Step 4 Remove the four Torx head s
26. test equipment and let them warm up for at least 10 minutes Step 2 Set the Calibration Generator Pulse Amplitude to Min minimum Step 3 Press the display CH 1 button on the 11A16 to enable the channel Step 4 Set the Vert Size to 100 mA div Step 5 Set the vertical Coupling to Off Step 6 Adjust the Vert Offset to position the trace at the graticule center Step 7 Set Coupling back to REV JUN 1991 Checks and Adjustments Step 8 Remove the current probe plug that covers R45 See Figure 2 1 Step 9 Now degauss the probe by pressing the CH 1 DEGAUSS button Step 10 Select Extended Diagnostics from the Utility major menu Step 11 Select Right 11A16 Plug in Subsystem or Block the CH1 CAL B Area and the AUTO BAL Routine Step 12 Select Run and record the value from the ACTUAL column 1000 to 1000 milliunits Step 13 Exit the Extended Diagnostics menu A Step 14 Adjust R45 based on the value recorded in Step 12 as follows lf the recorded value X is negative adjust R45 to bring the trace down Xmilli units 2 mA if the recorded value X is positive adjust R45 to bring the trace up Xmilli units 2 mA Step 15 Degauss the probe again by pressing the CH 1 DEGAUSS button OU Step 16 Repeat Steps 10 through 14 until the value obtained in the diagnostic test Step 12 is less than 100 milliunits Step 17 Replace the plug over R45 Proceed to the Tr
27. the cover 3 33 Cover End Tabs index Bevel A L IC Retaining Clip Socket 2ocket Index Spring 68 Pin Slam Pack IC Mating Recesses r Slam Pack IC Pin Number Sequence Path Highest Pin Number Dual In Line Package IC ee eee 1 Index index Index index Index Index Index Figure 3 14 Semiconductor Indexing Diagram 3 34 Maintenance Programming the Unit Identification This section discusses the procedure to enter the Unit Identification UID into the 11A16 nonvolatile RAM NVRAM The UID is identical to the serial number of the 11A16 and is stored in NVRAM You will need to enter this number if the Main board is replaced or if data in NVRAM becomes corrupted Enter the UID as follows Step 1 Connect your terminal to the RS 232 C port of the mainframe Refer to the User Reference manua of your mainframe for instructions on setting up the RS 232 C parameters Step 2 Configure the mainframe jumper that allows programming of calibration constants and the mainframe Unit Identification often referred to as the Cal Lock jumper Refer to the mainframe Service Reference for instructions on locating and setting the Cal Lock jumper E Step 3 Move the jumper J990 on the Main board so that it covers the two left most jumper pins pins 1 2 Refer to Figure 3 2 for the location of this jumper Obtain the 11A16 serial number fro
28. 01 11302 2 4 or later 11301A 11302A 1 0 or later 11401 11402 4 X or later 11402A 11403 2 2 or later 11403A CSA 404 3 0 or later DSA 601 DSA 602 1 1 or later Contact your Tektronix field office for the most recent firmware version for your mainframe Degauss 11300 Series If you change 11A16 settings during the two second probe Degauss process it can result in a Plugin Communication Faiiure error which is displayed The error occurs because the 11A16 ignores mainframe requests during deskew Commands sent to the 11416 over the ASCII interface can also produce this error ADD NOV 1988When degauss is complete the 11A16 is fully operational If an error does occur it can be easily cleared after degauss by changing any 11A16 setting Probe Calibration and Deskew When you select the probe calibration function Probes from the mainframe UTILITY menu the mainframe performs vertical probe calibration and time deskew on the channel you select Calibration adjusts sensitivity and offset parameters for greatest accuracy Then the deskew operation attempts to match the time delay between the selected channels The deskew operation of most mainframes will correct for delay differences up to 15 ns between channels This delay includes the cable propagation time and rise time of the probes and amplifiers If the delay difference between channels is greater than 15 ns a complete automated deskew will not be possible Refer to Probe Op
29. 05 E MCDOWELL RD 9301 ALLEN DR 6136 NE 87th AVE PO BOX 20038 515 FISHING CREEK RD 15201 BURBANK BLVD SUITE C 1800 216TH AVE NW 1109 MCKAY DR 114 OLD STATE RD PO BOX 14460 111 INDUSTRIAL RD 5858 WILLOW LANE 14150 SW KARL BRAUN DR PO BOX 500 3221 W BIG BEAVER RD 1101 SAMUELSON RD 50 INGOLD RD 600 18TH AVE REV JUL 1991 City State Zip Code CHICAGO IL 60609 3320 PORTLAND OR 97224 TIGARD OR 97223 TUALATIN OR 97062 HILLSBORO OR 97124 6629 OAKLAND CA 94621 1254 CUPERTINO CA 95014 0708 SALEM OR 97303 SPOKANE WA 99202 VANCOUVER WA 98661 2999 PORTLAND OR 97214 HILLSBORO OR 97124 WHIPPANY NJ 07981 1001 PHOENIX AZ 85008 4229 CLEVELAND OH 44125 4632 PORTLAND OR 97220 NEW CUMBERLAND PA 17070 3007 VAN NUYS CA 81411 3532 HILLSBORO OR 97124 6629 SAN JOSE CA 95131 1706 ST LOUIS MO 63178 COLD SPRING KY 41076 9749 LAKE OSWEGO OR 97034 5343 BEAVERTON OR 97077 0001 TROY MI 48098 ROCKFORD IL 61101 BURLINGAME CA 94010 2206 ROCKFORD IL 61108 5181 Fig amp Index Tektronix Serial No Mfr No Part No Effective Dscont Qty 12345 Name amp Description Code Mfr Part No 1 1 366 0600 00 4 PUSH BUTTON 0 269 X 0 409 ABS TK1163 ORDER BY DESC 2 366 1058 00 1 KNOB GRAY 0 625 X 0 255 X 0 485 QJRO5 ORDER BY DESC ATTACHING PARTS 3 214 1095 00 1 PIN SPRING 0 187 L X 0 094 OD STL 22599 52 022 094 0187 END ATTACHING PARTS 4 105 0076 04 1 RELEASE BAR LCH PLUG IN UNIT OJRO5 ORDER BY DESC
30. 42 inch coaxial cable and the Voltage Adapter Step 4 Set the Vert Size to 1 V div Step 5 Set the Vert Offset to 2 5 V Step 6 Select the Peak Peak measurement Measure major menu Step 7 Check that the measurement is 5 V 50 mV with averaging on Step 8 Press the CH 1 Display on off button to turn CH 1 off Press the CH 2 Display on off button to turn CH 2 display on Step 9 Repeat the Steps 2 through 7 for the CH 2 input Checks and Adjustments Procedure 8 This procedure shows the setup and lists the steps necessary to check Bandwidth Limit X bandwidth limiting Its purpose is to verify that rise time is within the proper range for a particular bandwidth limit filter Specification At a bandwidth limit of 100 MHz rise time is 2 45 ns gt 4 55 ns At a bandwidth limit of 20 MHz rise time is 12 3 ns gt 22 7 ns Setup to Check Bandwidth Limit Voltage Adapter Mainframe Calibration Generator Fast Rise Output e e 42 inch Coaxial Cable Steps Necessary to Check Bandwidth Limit Step 1 First Initialize the mainframe settings then set the following parameters in the order listed Center Plug in CH Display On OT 4i uu mc E elle deck ene hate etes on Calibration generator piis PERCEPTIS 1 ps MOSS ders een eerie Sie ae uq Fast Rise Pulse Amplitude 5 divisions 1 V p p Mainframe Man SIZB corset Sou mx eR ES 5 ns div
31. AL value should be between MIN and MAX 15 to 5 Values of 10 to 12 are typical Step 37 Ifthe ACTUAL Probe Gain value is within the acceptable range and probe gain calibration failed in Step 32 then the 11 16 should be examined by a Tektronix service center If the ACTUAL Probe Gain value is ess than 15 adjust R38 to increase the signal amplitude slightly and compromise step flatness Now optimize transient response by performing Steps 18 through 30 while skipping Step R27 DO NOT readjust R38 in Step 27 as you have just set it to meet probe gain requirements Step 38 Ensure that Probe Gain is now correct by repeating the gain check in Steps 34 through 36 REV JUN 1991 2 9 2 10 Procedure 1 Initial Setup This procedure shows the setup and lists the steps necessary to configure the mainframe and 11A16 15 purpose is to warm the instruments and test equipment to the proper operating temperature The Checks and Adjustments procedures should be performed within the ambient temperature range of 18 and 28 C to ensure proper mainframe and 11A16 operation Specification Power on and warm test equipment To avoid equipment damage set the mainframe ON STANDBY switch to STANDBY before installing or removing plug ins Turning the mainframe power off during probe calibration self calibration Extended Diagnostics or other intense system activity may result in some internal data being corrupted If corrupt
32. Bandwidth 20 MHz Acquire Desc Average Set AVON s ossa bd dk Sere turae dos hes 32 MEASUREMENT major menu Measurement Mean Meam ascetics 545 akut Soden slo ee dw a dre touch Data whole zone 11A16 Service Reference REV JUN 1991 2 21 Procedure 6 DC Balance 2 22 Step 3 Check that the Mean readout is within the appropriate Error Limit listed in Table 2 4 Step 4 Repeat Step 3 for each Vert Size setting in Table 2 4 LI L Step 5 Set the CH 1 Display on off to off L Step 6 Set the CH 2 Display on off to on E Step 7 Repeat Steps 1 to 4 for the CH 2 input TEUDBDDISPRDPUEDIBUCUIBENEHUUUMBRBBBESSRUPEPMIMSNINMBIMBLBLDMMBIBILMPPPSURUBDIMTBTPCGPPPLERSPISNSPIWMeMPPLUEesPI MQMegte pPIMlttseTPttTegMeTPSPIIuuuUPUeecrsvUguneueeeeemeeeeeMBLLLEMMELMEeeeeedun a aaa Ra aia att e p I aT Se OGL har Ae a aa aC aa aE VOV ata ar aC Oa a a a a ORB INSTITUIT SUNT TnT 11400 Series Shift Vert Size div Error Limit 1 U div 0 07 70 mU 100 mU div 0 07 7 0 mU 50 mUdiv 0 1 5 2 mU 20 mU div 0 11 2 2 MU 10 mU div 0 12 1 2 mU 5 mU div 0 14 0 7 mU 2 mU div 0 2 0 4 mU 1 mU div 0 3 0 3 mU Checks and Adjustments Procedure 7 This procedure shows the setup and lists the steps necessary to check vertical Verti
33. HORTING 22526 65474 006 A15980 A1J990 A1J992 38 159 0235 00 2 FUSE WIRE LEAD 0 75A 125V FAST 71400 TR MCR 3 4 A1F500 A1F610 39 160 6636 00 1 MICROCKT DGTL CMOS 16 X8 EPROM PRGM 80009 160663600 A1U1080 40 671 1451 00 B010100 010154 2 CIRCUIT BD ASSY ATTENUATOR 80009 671145100 671 1451 01 010155 2 CIRCUIT BD ASSY ATTENUATOR 80009 671145101 SEE A1A3 A1A4 EXCHANGE ITEM 41 148 0246 00 8 RELAY ARM 2 FORM C 2 COIL LATCH 5V TK1689 TQ2EH L2 5V K1 K2 K3 K4 ON BOTH A1A3 A1A4 42 220 0022 00 6 NUT BLOCK 0 4 0 25 X 0 33 4 40 80009 220002200 ATTACHING PARTS 43 211 0409 00 6 SCR ASSEM WSHR 4 40 0 312 PNH STL T10 93907 829 06888 024 END ATTACHING PARTS 44 426 2060 00 1 FR SECT PLUG IN UPPER ALUMINUMN TK1465 ORDER BY DESC ATTACHING PARTS 45 211 0392 00 2 SCREW MACHINE 4 40 X 0 25 FLH STL T 8 93907 ORDER BY DESC END ATTACHING PARTS 46 334 3438 00 1 MARKER IDENT MARKED TURN OFF POWER TKO860 ORDER BY DESC 47 214 1061 00 1 CONTACT ELEC GROUNDING CU BE 80009 214106100 48 337 1064 11 2 SHIELD ELEC PLUG IN SIDE 80009 ORDER BY DESC 49 386 5296 00 1 PANEL REAR POLYCARBONATE TK1163 ORDER BY DESC ATTACHING PARTS 50 213 0904 00 4 SCREW TPG TR 6 32 X 0 5 PNH STL 83385 ORDER BY DESC END ATTACHING PARTS STANDARD ACCESSORIES 015 0598 00 1 VOLTAGE ADPTR 11A16 80009 015059800 015 0601 00 1 ADAPTER 1 TURN CURRENT LOOP 03888 P N VNPRT JA 11 070 7763 00 1 MANUAL TECH USERS REFERENCE 11A16 80000 070776300 070 7764 00
34. ILIL Figure 3 1 Sample LED Fault Code Timing Diagram The three kernel tests are Test 1 The EPROM Checksum test computes a checksum of the content of the firmware EPROM This calculated checksum is then compared with a checksum stored in the EPROM If the checksums do not match the test fails and fault code 1 is reported After the front panel LEDs flash to report the fault code the 11A16 attempts to begin normal operation however it is unlikely that the 11A16 can function properly with a bad EPROM Checksum Test 2 The Nonvolatile RAM NVRAM test verifies that the NVRAM is functioning properly Since the NVRAM contains calibration information which must remain undamaged this test does not alter critical data If the testing algorithm detects a failure then the 11A16 reports a fault code of 2 and repeatedly loops the NVRAM test The 11A16 continues looping the NVRAM test until the mainframe is powered off ON STANDBY switch is set to STANDBY Until the condition causing the NVRAM test to fail is corrected the mainframe does not recognize the 11A16 The NVRAM test could corrupt data stored in the NVRAM if the mainframe is powered off and on during this test if corruption occurs then the Calconstant Checksum is also corrupted At the next power on the 11A16 resets the calibration constants to default EPROM settings and reports a plug in 11A16 Calconstant Checksum Error during normal power on diagnostics To properly c
35. K 10 2K262 ORDER BY DESC 23 151 0390 00 TRANSISTOR DARLINGTON NPN SI 04713 MPS U45 A1Q600 A1Q690 ATTACHING PARTS 24 211 0022 00 4 SCREW MACHINE 2 56 X 0 188 PNH STL 0435 ORDER BY DESC 25 210 1156 00 4 WASHER SHLDR 0 09 ID X 0 2 OD X 0 085 D NYL 80009 210115600 26 210 0994 00 4 WASHER FLAT 0 125 ID X 0 25 OD X 0 022 STL 12327 ORDER BY DESC END ATTACHING PARTS 27 407 3676 00 1 BRACKET HT SK ALUMINUM 5Y400 ORDER BY DESC ATTACHING PARTS 28 211 0392 00 4 SCREW MACHINE 4 40 X 0 25 FLH STL T 8 93907 ORDER BY DESC END ATTACHING PARTS 29 407 3363 00 1 SK ALUMINUM TK1943 ORDER BY DESC ATTACHING PARTS 5 4 REV JUL 1991 Replaceable Parts Fig amp Index Tektronix Serial No Mfr No Part No Effective Dscont Qty 12345 Name amp Description Code Mfr Part No 30 211 0711 00 2 SCR ASSEM WSHR 6 32 X 0 25 PNH STL T15 OKBO1 ORDER BY DESC END ATTACHING PARTS 31 671 1448 00 1 CIRCUIT BD ASSY MAIN 80009 671144800 SEE A1 EXCHANGE ITEM 32 165 2089 06 MICROCKT LINEAR VERT 200 OHM 80009 165208906 33 214 3785 00 HEAT SINK ELEC ALUMINUM 80009 ORDER BY DESC ATTACHING PARTS 34 211 0391 00 8 SCREW MACHINE 2 56 0 437 P4 STL T 8 83486 ORDER BY DESC END ATTACHING PARTS 35 156 2625 00 1 MICROCKT DGTL NMOS CUSTOM SENES 66302 VF4124RC 0001 A1U850 36 670 8986 00 2 CIRCUIT BD ASSY SAMPLE HOLD 80009 670898600 SEE A1A1 A1A2 EXCHANGE ITEM 37 131 0993 00 3 BUS CONDUCTOR SHUNT S
36. ME REASON FOR REPORT USER Hardware Mechanical Problem ADDRESS Software Firmware Problem CITY uuo A IE Documentation Problem PHONE TC EXTENSION 1 Suggested Enhancement IS THE PROBLEM REPRODUCIBLE O Yes No SUBMITTED BY n z o aaa O Intermittent SYSTEM DESCRIPTION Hardware software firmware and host related to the problem DESCRIPTION OF PROBLEM LIST ENCLOSURES Tektronix COMMITTED TO EXCELLENCE 250 0651 00 2 42 gt VII VIH Instructions For Completing The Problem Report Please type or print clearly Use a separate Problem Report PR for each problem SECTION A Fill in the instrument configuration table including all plug in units modules and probes installed in the oscilloscope The information can be found in one of the menus under the UTILITY major menu Instrument Write the instrument name e g 11301 11401 11A32 etc Section Microprocessor Subsystem If the instrument has more than one section write the section name For plug ins write in which mainframe slot they are located e g left center right ROM Version Write the rom version number for each instrument and section Instruments with more than one section will have more than one version number ID Serial Number Write the seria number for each instrument At the factory the ID number is pro grammed to be the in
37. Malt POS 5L eR eet RUE RES 25 5 ns position rising edge at screen center VEM SILO dr eu 200 mV div ce eina RE Ro LA 500 mV WAVEFORM major menu BW Limit 11400 222222222285 ea eee bh EAS 100 MHz Input Parameters DSA 600 touch Bandwidth 100 MHz 11A16 Service Reference REV JUN 1991 2 25 Procedure 8 Bandwidth Limit 2 26 g Step 2 With these settings the display should have a five division peak peak signal Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Select the Rise Time measurement MEASURE major menu Check that the rise time is between 2 45 and 4 55 ns Set the BW Limit 11400 or Bandwidth DSA 600 limit to 20 MHz Check that the rise time is between 12 3 and 22 7 ns Set the CH 1 Display on off to off Set the CH 2 Display on off to on Repeat Steps 1 through 6 for the CH 2 input REV JUN 1991 Checks and Adjustments Procedure 9 This procedure shows the setup and lists the steps necessary to check AC AC Coupling coupling Its purpose is to verify that AC coupling operates accurately Specification Bottom of square wave is near the center graticule line The waveform is vertically centered on the screen and resembles Figure 2 3 At 1 mV div the waveform is within 0 3 divisions of vertical center Setup to Check AC Coupling Voltage Adapter Mainfr
38. S button Check that the signal trace is vertically zeroed to the center graticule within the specifications given above Step 10 Check CH 2 by moving the current probe to CH 2 and repeating Steps 2 through 9 2 39 2 40 Procedure 13 Probe Calibration This procedure shows the setup and lists the steps necessary to check probe calibration Its purpose is to confirm that the mainframe and 11A16 can calibrate the current probe using the Current Loop adapter connected to the mainframe Calibrator BNC output DO NOT connect the Current Loop adapter at this time This procedure will further verify that the front end 11A16 circuitry such as the Power Amplifier Hall Effect Amplifier and the Attenuators are operating properly Specification The mainframe calibrates the current probe without a failure Setup to Check the 11A16 Probe Calibration Mainframe Current Loop Adapter Not Connected Initially Current Probe Steps Necessary to Check Probe Calibration Step 1 If the EA Enhanced Accuracy icon is not displayed then press the ENHANCED ACCURACY button twice in succession Enhanced Accuracy should NOT be invoked when the Current Loop Adapter is connected to the calibrator output of the mainframe The Current Loop Adapter places a considerable load on the precision voltage reference in the mainframe During an Enhanced Accuracy calibration the precision reference can be overloaded resulting in a cal
39. Service Manual PROPERTY OF O ERST FINANCE AND REMARKETING DIVISION Tektronix 11A16 Two Channel Current Amplifier 070 7704 00 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to performing service Please check for change information at the rear of this manual First Printing January 1991 Revised October 199 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 010000 Tektronix Inc Beaverton Oregon USA E200000 Tektronix United Kingdom Ltd London J300000 Sony Tektronix Japan H700000 Tektronix Holland NV Heerenveen The Netherlands Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit alpha code to identify the country of manufacture e g JP for Japan HK for Hong Kong IL for Israel etc Tektronix Inc Box 500 Beaverton OR 97077 Printed in U S A Copyright Tektronix Inc 1991 All rights reserved
40. Tektronix products are covered by U S and foreign patents issued and pending The following are registered trademarks TEKTRONIX TEK TEKPROBE and SCOPE MOBILE WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year 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 order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make Suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronixservice center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations 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 warranty a to repair damage resulting from attemp
41. a Muti pin Connector Removing Replacing Front Panel ch RR S br Mh Ve Removing Replacing a Front Panel Removing Replacing a Multi pin Connector Removing Replacing a Front Pane board 4 4 9 0 4 coc c9 c c9 a c3 9 4 oa 4 9 8 4 9 74 7 3 4 gt Removing Replacing a Fuse Removing Replacing a Heat Sink Bracket 9 4 c c s 9 5 9 4 Removing Replacing a Pin Jumper Removing Replacing an Attenuator Removing Replacing a Multi Pin Connector Removing Replacing a Heat Sink Bracket Removing Replacing a Main board Programming the Unit Identification Removing Replacing Darlington Pair Power Transistors Removing Replacing a FRU Programming the Unit Identification e o a 9 9 Po 9 9 4 c 9 9 B 9 4 amp 4 9 Removing Replacing a Darlington Pair Power Transistor 8 c 4 Removing Replacing a Relay a a o o u a a s e enn l E yn lM l yM y Removing Replacing a Slam Pack IC 0 9 9 4 9 4 0 4 4 Removing Replacing a Sample and Hold board Removing Replacing an Attenuator Board See Figure 3 3 for connector locations Rem
42. acket Heatsink NPNTRAN Bracket Probe Connector NPNTRAN Transistor PNPTRAN Assemblies Bracket PCON Heatsink Figure 3 2 FRU and FRU IC Locator 3 14 Maintenance Table 3 8 FR FRU to be Replaced AMP 1 or AMP2 ATT1 or ATT2 EPROM PCON Front Pane FPB FUSE Heat Sink Bracket Jumper Main board NPNTRAN NVRAM PNPTRAN RELAY K1 K4 SDI SMPLHD 11A16 Service Reference To avoid damage to the 11A16 set the mainframe ON STANDBY switch to STANDBY and remove the 11A16 from the maintrame before removing or replacing FRUS If the mainframe green indicator light remains lit when the ON STANDBY switch is in the STANDBY position then the switch was internally disabled after the servicing of the Power Supply module To enable the ON STANDBY switch refer to Corrective Maintenance in your mainframe Service Reference Removal Replacement Procedure Cross Referenc Procedure s to Reference During Removal Replacement Removing Replacing a Heat Sink Bracket Removing Replacing Assembly Removing Replacing a FRU IC ee Removing Replacing Heat Sink Bracket Removing Replacing an Attenuator board 4 4 4 Removing Replacing a FRU Femoving heplacing a Front Panel usta d gx ERES Removing Replacing a Connector Assembly Removing Replacing
43. al Block Diagram The following sequence is a brief overview of how the 11A16 acquires and processes a signal see Figs 4 1 and 4 2 LJ LJ L Step 1 Analog input signals are acquired from two sources in the current probe the Hall Effect device and the probe winding Step 2 The Hall Effect device signal is passed through the Hall Effect amplifier the Power amplifier then back to one side of the probe winding Step 3 attenuator assembly receives the signal from the other side of the probe winding t provides the input coupling mode AC DC or OFF and attenuation Step 4 The Kernel block generates offset voltages for the Hall Effect amplifier the Power amplifier and the Main Amplifier The Kernel block also reads and drives the Front Panel Control block Step 5 The Main Amplifier block receives the signal from the Attenuator block It subtracts the offset voltage from the input signal then amplifies the difference Step 6 The Main Amplifier block then amplifies and replicates this difference signal to three independently buffered outputs display trigger and CH 1 or CH 2 auxiliary Step 7 The Kernel block provides ON OFF control for all the amplifier block outputs along with Normal Invert control signals for the display and trigger outputs 4 1 Detailed This section describes and illustrates the analog and digital circuitry of the 11A16 Block Diagram block diagram see Fig 4 2 Descriptions
44. alibrate the mainframe and 11A16 you must initiate an Enhanced Accuracy calibration Test 3 The Housekeeper IC test verifies the functionality of the Housekeeper IC also referred to as the SDI IC The Housekeeper IC performs the following housekeeping chores of the 11A16 channel sequencing refreshing the analog control voltage system AVCS and providing seria data communications with the mainframe This test exercises the IC and records the ICs signature If the resulting signature of the Housekeeper IC does not match a known good signature then this test fails 3 3 and the 11A16 reports a fault code of 3 and repeatedly loops on the Housekeeper IC test After all kernel tests have been compteted and successfully passed the 11A16 initializes its settings and communicates with the mainframe Self Tests After passing the kernel tests the mainframe requests that the 11A16 execute its Self Test routines unless the mainframe Self Tests are disabled If the mainframe returns to normal operation or enters into a new configuration calibration this indicates successful completion of the Self Tests Self Tests diagnostics verify the following Probe coding m Calibration cal constant checksums m Calibration cal constant values a Analog to digital ADC and digital to analog DAC converters gm 15 V power fuses m Input signal path Extended Diagnostics After all Self Tests and Extended Diagnostics are executed
45. ame Calibration Generator 42 inch Coaxial Cable Steps Necessary to Check AC Coupling C Step 1 First Initialize the mainframe settings then perform the following settings in the order listed Center Plug in CH 1 Display on off E on Calibration generator NP Ep arctan UE ECCE Fast Rise ATBDIITBGOG eso duced eg eem 1 V 5 divisions 1 ect donat durs deti f dre 10 ms Mainframe Vert SIZ6 Spp lea hes 200 mV div SIZB coser OX VR OU MI aia andan 2 ms div Step 2 Examine that the bottom of the square wave is near the center graticule line as shown at the top of Figure 2 3 Step 3 Select AC Coupling for the CH 1 input Step 4 Examine that the displayed waveform is vertically centered and that it resembles the bottom waveform in Figure 2 3 11A16 Service Reference 2 27 Procedure 9 AC Coupling Step 5 Set the CH 1 Display on off to off Step 6 Move the Voltage Adapter and coaxial cable to the CH 2 input Step 7 Set the 2 Display on off to on and repeat Steps 1 through 4 for the CH 2 input Waveform Coupling Set to DC Waveform Coupling Set to AC Figure 2 3 Waveform with DC Coupling Top and AC Coupling Bottom 2 28 Checks and Adjustments 11A16 Service Reference EE ee Procedure 9 AC Coup
46. and set its Display on off button to on Step9 Perform the Steps 1 to 6 for the CH 2 input Procedure 4 This procedure shows the setup and lists the steps necessary to check the input Overload overload response Its purpose is to verify that the 11A16 responds properly to overload conditions by turning coupling off Specification Coupling changes to Off within 2 seconds Setup to Check Overioad Mainframe BNC to Dual a LZ Banana 42 inch Voltage Adapter Coaxial Cable Steps Necessary to Check Overload Step 1 First Initialize the mainframe settings then perform the following settings in the order listed Center Plug in GEL T DISBIaV Lue uv ow dee is rx eae EHE SES on Mainframe eae eee Lee 50 mU div Input Parameters DSA 600 touch Coupling C1 and 2 DC Coupling 11400 a SCIES US dnd DC Power supply VONG sexier eta eg eo tent 4V nascar Sareea Bats tae a oat ns 400 mA In the following steps IMMEDIATELY disconnect the cable from the input if the coupling does not change within 2 seconds Step 2 Ensure that CH 1 is selected by touching its waveform on the display or by pressing the CH 1 Display on off button twice Checks and Adjustments 11 16 Service Reference E HOOCH epoca GOC Step 3
47. anel from the 11A16 see Fig 3 8 Step 6 Remove the four Torx head screws that secure the hybrid heatsink bracket to the top and bottom frames Step 7 Remove the six Torx head screws and nut blocks that secure the Main board to the top and bottom frames Step 8 Carefully withdraw the Main board between the frames and remove it from the 11A16 Step 9 If the Main board is being replaced remove the Darlington Pair transistors still Mounted on their heatsinks from the old Main board Leaving the transistors attached to their heatsink will guarantee proper reinstallation in the new Main board The transistor sets are interchangeable through the PNP and NPN transistors of a set must be correctly placed Figure 3 2 shows the correct transistor orientation Maintenance TEM a Rear Front Panel board Panel Connectors Nut Blocks 4 Heat Sink Rear Panel See Figure 3 11 Bracket Lock Pin Figure 3 10 Removing Replacing the Main Board gt Top of Amplifier L Frame Section vf Torx Head Screw Nut Block Circuit Board E Figure 3 11 Torx Screw and Nut Block Orientation 11A16 Service Reference 3 29 3 30 If you are replacing a Main board with a new one you will need to remove two items from the old Main board the 1 Heat Sink bracket and the two pair of Darlington Pair transistors with heatsinks Replace the Main board as follows Step 1 Lay the 11A16 on its side with the
48. ansient Response adjustment R36 R45 gn N A6303 Current Probe R34 R38 IE Figure 2 1 Location of Adjustments on the A6303 Current Probe 11A16 Service Reference REV JUN 1991 2 7 2 8 Procedure to Adjust Transient Response C Step 18 Connect the coaxial cable from the Calibration Generator to the CH 2 input through the Voltage Adapter Leave the current probe connected to CH 1 Press the display CH 2 button on the 11A16 Step 19 Set CH 2 Vert Size to 1 V div Main Size to 2 ms div and Coupling to DC Step 20 Set the Calibration Generator Period to 0 1 ms and the Pulse Amplitude to 5 divisions 5 V p p Step 21 Press the display CH 2 button on the 11A16 to disable the channel Step 22 Now degauss the probe by pressing the CH 1 DEGAUSS button Step 23 Move the CH 2 input end of the coaxial cable to the Current Loop Adapter which should already be locked in the jaws of the A6303 probe o OOO rn Step 24 Set the CH 1 Vert Size to 25 mA div and bandwidth limit to 15 MHz If desired waveform Averaging may be enabled to reduce the displayed noise Select Acquire Desc in the Waveform major menu and then Average N and Set AvgN in the Acquire Description pop up menu Set the Average N knob for 8 Step 25 Set the Calibration Generator Period to 10 ms otep 26 Remove the A6303 access plugs for adjustments R34 R36 and R38 Refer to Figure 2 1 Step 27 Adjust R38 for maxim
49. any resultant error index codes appear on the display next to the associated circuit block names in the Extended Diagnostics mainframe menu Each circuit block that experiences failure will indicate the first error encountered and the number of failures in the Block To get a more complete list of the error index codes in a Block select a failed Block and then the Area selector To display the lowest level test routines in the selected Area select the Routine The currently selected Block Area and Routine are shown Several diagnostic operating mode selectors are available on the screen Refer to your mainframe User Reference for more information on Extended Diagnostics and Extended Test menus and operation Enhanced Accuracy Errors Enhanced Accuracy Errors specify faulty FRUs that are preventing the mainframe from entering its Enhanced Accuracy state See your mainframe User Reference for more information about Enhanced Accuracy Maintenance Error index Codes Error Index Codes are five digit codes whose first character indicates the subsystem or 11A16 tested The last four digits are hexadecimal hex numbers that indicate the Block Area Routine and failure identity For example R1241 is decoded as follows Right plug in facing the mainframe front panel Block name plug in Area name Group Routine name Checksum Probe Failure Identity specific failure mode The first character of an error index code indicates the co
50. are located on page 2 13 Step 1 First initialize the mainframe settings then perform the following settings in the order listed Center Plug in CH 1 Display on off TOC PPM cc MR on Leveled sine wave generator Nice A p 500 kHz Mainframe Caelo MET wee eR San ES 500 mV div Main SIZ 2205052 assa sed hace dog vr S 10 ws div Acquire Desc pop up menu Average IN ove uto CE doe PRECOR allure On SGLAVO Nou oo tC e EU MESE 128 Step 2 Set the leveled sine wave generator for 3 V peak peak 6 div Step 3 Select the Peak Peak measurement to measure the peak to peak amplitude of the waveform Be sure the mainframe trigger is stable Record the Peak Peak measurement for the reference waveform Step 4 Set the leveled sine wave generator Frequency control to the maximum bandwidth frequency specified for the mainframe 11A16 combination 120 MHz This limit is displayed as BW Limit WAVEFORM major menu Input Parameters pop up menu Step 5 Set the Main Size to 5 ns div Step 6 Check that the Peak Peak measurement is at least 2 34 V 78 of the peak peak amplitude measured in Step 3 REV FEB 1991 Checks and Adjustments 11A16 Service Reference Procedure 3 High Frequency Response Step 7 Set the CH 1 display on off button to off Step 8 Move the Voltage Adapter and coaxial cable to the CH 2 input
51. cal Accuracy accuracy Its purpose is to verify that the accuracy of DC levels is within the proper range The instrument must be checked immediately after Enhanced Accuracy calibration Specification Measurement of 0 2 Peak Peak resolution for the 11400 Series mainframe Measurement of 0 8 Peak Peak resolution for the DSA 600 Series mainframe Setup to Check Vertical Accuracy Mainframe Calibration Generator 42 inch Voltage Adapter d Coaxial Cable Steps Necessary to Check Vertical Accuracy Step 1 First run the Enhanced Accuracy calibration by pressing the ENHANCED ACCURACY button twice in succession Enhanced Accuracy is achieved after several minutes Step 2 Now Initialize the mainframe settings then set the following parameters in the order listed Center Plug in Crt DISDIaY ahem ergo te deter de dos on Calibration generator MOOG bier dass be dure desc uut tet Bara Org Std Amp Amplitude Output 10 V provides 5 V across 50 input Mainframe WAIN Size 1 cer etw oed eoa d ed 100 us div Acquire Desc Average if available NO AVCIAQC tended EN 32 Mert Off Set uos E 0 U 11A16 Service Reference 9 99 Procedure 7 Vertical Accuracy GECO Coupling C1 C2 Step 3 Connect the Calibration Generator output to the CH 1 input using the
52. ce limitations an Item Name may sometimes appear as incomplete For further Item Name identification U S Federal Cataloging Handbook H6 1 can be used where possible Indentation System This parts list is indented to show the relationship between items The following example is of the indentation system used in the Description column 1 2 S3 4 5 Name amp Description Assembly and or Component Attaching parts for Assembly and or Component END ATTACHING PARTS Detail Part of Assembly and or Component Attaching parts for Detail Part END ATTACHING PARTS Parts of Detail Part Attaching parts for Parts of Detail Part END ATTACHING PARTS Attaching Parts always appear in the same indentation as the item it mounts while the detail parts are indented to the right Indented items are part of and included with the next higher indentation Attaching parts must be purchased separately unless otherwise specified Abbreviations Abbreviations for the FRU boards listed in Table 5 1 conform to American National Standards Institute ANSI standard Y1 1 Other FRUs are listed on page NO TAG RTT utut tutt TRU IIa a utut tts a a a a TTL UNI uu TUTTI IIT UN TUN ae a i e NNNIINSnNTSS FRU Part Number Description A1 671 1448 00 Main Board A1A1 670 8986 00 Sample Hold Board A1A2 670 8986 00 Sample Hold Board
53. crews securing the heatsink bracket to the top and bottom frames Take care not to spread the top and bottom frames which could damage the Darlington Pair power transistors If necessary remove the screws securing the transistor heatsink to the side rail Step 5 Slide the heatsink bracket out the rear of the frame Be careful not to damage the leads of the power transistors To replace the heatsink bracket perform the previous steps in the reverse order Maintenance Torx Head Screws 2 Securing the Heatsink Bracket to Top Frame Torx Head Screws 2 Securing the Rear Panel to Top Frame 2 4 4 A NT X Rear Panel Rear Panel Lock Pin kh e Torx Head Screws 2 Securing the Heatsink Bracket to Bottom Frame Torx Head Screws 2 Securing the Rear Panel Heatsink Bracket to Bottom Frame Heatsink Torx Head Securing Screws 2 Figure 3 8 Removing Replacing the Heatsink Bracket Removing Replacing the Hypcon Assembly The Hypcon Hybrid printed circuit connector Assembly connects a hybrid IC to the Main board A hybrid IC can be an amplifier or other device that has been integrated onto a ceramic substrate The Hypcon Assembly requires special care When replacing the Hypcon do not touch the elastomer or hybrid gold plated contacts with your fingers 11A16 Service Reference 3 25 Exploded View of Hypcon Conn
54. d the AMean measurement after it has stabilized Subtract the Vertical Offset set in Step 7 from the current AMean reading to get the DC Offset error Step 11 Check that the DC Offset error obtained in Step 10 is less than the Error Limit shown in Table 2 6 Step 12 Set Vert Offset to 0 E Step 13 Repeat Steps 6 through 12 for each Vertical Size and Offset shown in Table 2 6 Dellal eloelo leiel e e eje e eiee m eiela e e elele e etol a ein e eie ate aaee agaa o lagae lalala Telela masa a a e ege a ee e n n a e a eee e lalalelatatalatete le ateletatatetalal els aeee e eja elet e a aJe me Ta e eatae alelatateletatetataleta late ajajalle me ejeje e ateate a matae lela atelelebel felelselelalelela Vertical Size Vertical Offset Error Limit Volts 1 V div 4V 50 mV 0 1 V div 4V 14 mV 1 mV div 1V 2 4 mV 1 mV div 800 mV 2 0 mV 1 mV div 600 mV 1 6 mV 1 mV div 400 mV 1 2 mV 1 mV div 200 mV 0 8 MV 11A16 Service Reference 2 37 Procedure 12 This procedure shows the setup and lists the steps necessary to check probe Degauss Ability degauss ability Its purpose is to confirm that the 11A16 can degauss its current probe and zero its output signal This procedure will verify that the front end 11A16 circuitry such as the Power Amplifier Hall Effect Amplifier and the degauss Signal Generator are operating properly Check degauss ability immediately after an Enhanced Accuracy calibration Specification The mainf
55. e rails This will reduce the likelihood of component damage If you are installing a new Main board first remove the Darlington Pair transistors with their heatsinks from the old board and install them in the new Main board do not solder yet Step 7 Reconnect the 10 pin probe connectors into their receptacles on the Main board Connect the probe coaxial cables to the Main board and Attenuator boards Step 8 Reconnect the multi pin connectors from the Front Pane boards to the connectors on the Main board Step 9 Replace the attenuators see Removing Replacing an Attenuator in this section Step 10 If the Main board has been replaced then the Unit Identification UID number needs to be re entered refer to Programming the Unit Identification on page 3 35 Maintenance Removing Replacing Muiti Pin Connectors This section describes the multi pin connectors found on the 11A16 Pin 1 on a multi pin connector is designated with a triangle or arrowhead on the holder This triangle is indexed to a square pad on the board that denotes pin 1 A gap between the pin 1 and 3 positions in the holder keys a multi pin connector There is a corresponding gap between pins 1 and 3 on the board A small plastic plug covers the pin 2 position on the end of the holder Align the plastic plug of the holder with the gap between the board pins see Fig 3 12 Figure 3 12 Multi Pin Connector Orientation Removing
56. ective fuse remove the11A16 from the mainframe and use a digital multimeter to check for continuity across each fuse Figure 3 2 shows fuse locations Fuses are checked by a diagnostic test Darlington NPN or PNP Power Transistor Troubleshooting When using a current probe a faulty Darlington NPN NPNTRAN or PNP PNPTRAN Power Transistor could prevent input signal amplification Use a digital multimeter to check for at least 2 3 resistance between the emitter and collector the two outer leads of each transistor Additionally the heatsink tab is the collector and the square board pad is the emitter A blown fuse will have little affect on this measurement Probe Connector Troubleshooting A faulty probe connector assembly PCON could cause an intermittent or complete loss of input signal Check the continuity of each wire Relay Troubleshooting The 11A16 has four relays K1 K4 located on each Attenuator board See Figure 3 3 for relay locations A faulty relay could disable the following 11A16 functions for a signat channel m AC DC switching K4 Channel Coupling ON OFF K1 Attenuation range X10 K2 m Attenuation range X100 K2 amp Jumper Troubleshooting The misplacement of pin jumpers could cause unpredictable operation of the 11A16 Maintenance Field Replaceable Unit FRU Guide 11 16 Service Reference This section lists abbreviations of board FRUs component module FRUs and error
57. ector Screw Washer Assemblies 4 Plastic Frame oN Registration Pins Elastomer Contact Holder Index PC Board Microcircuit Stiffner Heat Sink Cross Section View of Hypcon Connector Contact Elastomer Contact Holder Conductor i D Conductor i D W An Tp u h m D Hybrid Substrate MN PC Board 4 My 0 PC Board Figure 3 9 Removing Replacing the Hypcon Assembly Note A work on Hypcon assemblies should be performed in a dust free environment to avoid contamination of contacts 3 26 Maintenance Remove the Hypcon assembly as follows Step 1 Notice the index on the Main board arrow and the plastic frame pointed tab Step 2 Unscrew and remove the four Torx head screw washer assemblies Step 3 Lift the plastic frame from the Main board Step 4 Notice the index location of the hybrid and remove the hybrid from Main board with the tweezers Note Step 5 describes the removal of the elastomer from the plastic frame This step is unnecessary when replacing the hybrid only Step 5 Notice the index location of the elastomer contact holder Grasp and lift the corner of the contact holder with the tweezers to remove the holder from the plastic frame Replace the Hypcon Assembly as follows Before remounting the Hypcon assembly use a 4X or greater magnifying glass to examine the hybrid elastomer and the Hypcon contacts
58. ectors Front Panel and the Front Panel BoardS Removing Replacing the Heatsink Bracket Removing Replacing the Hypcon Assembly Removing Replacing the Main board Torx Screw and Nut Block Orientation Multi Pin Connector Orientation Insertion Extraction Semiconductor Indexing Diagram 11A16 System Functional Block Diagram 11A16 Detailed Block Diagram One Analog Channel Exploded View of the 11A16 Two Channel Current Amplifier s as bmw 9 a a 5 co 9 4 9 o o 9 p 4 a 9 9 o A 3 amp c 95 85 s se nun s 22 4 42 v amp 9 9 9 9 9 m 9 c5 1 Measurement Limits Specifications Adjustments and Functional Test JESU EQUIDINGR dos rictu Deflection Factors and Associated Test Conditions 11A16 DC Balance Error Limits 11A16 DC Accuracy Error Limits 11 16 DC Offset Accuracy 11 16 Kernel Error Index Self Tests Extended Diagnostics Error Index Codes Sample and Hold Board Failure Codes Enhanced Accuracy Error Index Codes BORIC FRUS oor odes Ord seb Ee Vet elke oe Component Module FRUS Relat
59. edures which have a v indication in the Functional Test column of Table 2 1 If you wish to verify the specifications of the instrument perform all procedures Table 2 1 pease penn Limits e ey and Functional Test Procedure and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Procedure 1 Initial Setup none none none d Procedure 2 Enhanced successful none none _ execution Procedure 3 High Frequency d Response Amplifier Step Response aberrations lt 5 none none Amplifier Bandwidth Procedure 4 Overload Procedure 5 Input Resistance Procedure 6 DC Balance 11 16 Service Reference peak and 8 p p none amplitude at none 120 MHz gt 78 of 500 kHz reference none coupling changes none d to off none 50 2 none i none refer to Table 2 4 none REV JUN 1991 2 1 Table 2 1 Measurement Limits Specifications Adjustments and Functional Test Cont EE BEL AELSeeeu MHUSERMMSRBMERERRRBIMBMBEBEEeSRLBBMESESASRBPPLEMSMBBIMRDBIMHHRRREHRBBMSPRBMBMRDEMMBBBBEBBBMBMRIBPBMBEMBESRMRSSEAESUSIMPIEMBMBMSBBBPPBPBMERBBRSRSeEBBREMPBIBMeESLAZOMMSBBBMMMBDBMBMRSeSESEMBMBBRBBREIIMBMEMBBMBERBMeePBBBEeeoeeiMeBIBREBMPBD REV FEB 1991 Procedure and Description Measurement Specifications Adjustments Functional Limits Examine Check Adjust Test Procedure 7 Vertical Accuracy d Gain none 5V x50mVforthe none 11400 Series DSA 600 Procedure 8 Bandwidth Li
60. eration on page 2 5 for detailed information on probe degauss calibration and deskew ADD MAR 92 1 Di oor ce rey Ph de V 2 Certain mainframes have unique deskew limitations as follows 11300 Series The deskew range is 0 5 ns which i8 insufficient to accommodate the delays in the 11A16 and current probes ATT CAE APT ie OEM e s ORE BAS asdmiu occ u B SSE ESET DSA600 Series in addition to the 15 ns compensation limit between channels deskew can fail when the 11A16 is in the LEFT compartment interleaved sampling is invoked 1 or 2 GSample second and you attempt to deskew a Current probe During deskew calibration in this configuration the digitizer Interleave algorithm performs a rise time measurement on the current probe sigrial looking for a rise time of 3 ns or less The low bandwidth current probes will fail this rise time test and cause the deskew operation to terminate Installing the 11A16 Amplifier in the CENTER or RIGHT compartment resolves this probiem M e Freffer io Tektronitc Corporate Catalog for complete information about compatibility of amplifiers and mainframes gt 207 te AO ODOT PE PITS gt ET TON 10 ET IUE Ed ee RAAT SRE RN MIE ZI E 3 zn Y M _ 1 tle A PEU f y
61. erial communications between the 11 16 and the mainframe The SD IC converts parallel eight bit data bytes from the MPU into a serial data signal This serial data is then sent to the mainframe Conversely the SDI IC converts the serial data from the mainframe into parallel data bytes for the MPU to read Front Panel Block The Front Panel Control block communicates the status of the front panel buttons to the MPU block The board contains two LED s and two push buttons per channel The MPU will turn on a channel On LED when the display On push button is pressed Current Probe The Current Probe contains a winding and a Hall Effect Sensor that convert electrical current in a conductor to voltage signals for the plug in unit The winding provides high frequency signals and the Hall Effect Device provides DC and low frequency signals Theory of Operation Replaceable Parts This section contains a list of the components that are replaceable for the 11A16 Two Channel Amplifier As described below use this list to identify and order replacement parts Parts Ordering Replacement parts are available from or through your local Tektronix Inc service Information center or representative Changes to Tektronix instruments are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is important to include the followin
62. face that is capable of generating static charge Table 3 7 Relative SUSCEPUBANY to from Static Discharge Relative Semiconductor Classes Susceptibility Levels MOS or CMOS microcircuits and discrete or linear 1 microcircuits with MOS inputs most sensitive ECL 2 Schottky signal diodes 3 Schottky TTL 4 High frequency bipolar transistors 9 JFETs 6 Linear microcircuits 7 Low power Schottky TTL 8 TTL least sensitive 9 Voltage equivalent for levels 100 to 500V 6 600 to 800 V 2 200 to 500 V 7 400 to 1000 V est 3 250 V 8 900 V 4 500 V 9 1200 V 5 400 to 600 V The voltage equivalent is the voltage discharged from 100 pF capacitor through a resistance of 100 Once you have determined the suspect FRU remove the 11A16 side shields as discussed in the Preventive Maintenance section of Maintenance find the FRU on the 11A16 Main board by referring to Figure 3 2 then refer to Table 3 8 to find the removal replacement procedure s The exploded view drawing in Replaceable Parts can be useful in the removal replacement procedures that follow 3 19 ATTN1 Fuse Fuse Front Panel AMP1 Relay F500 F610 SMPLHD1 SDI NVRAM Boards FPB ee fen es i RE i MM ES tr fa ciate SEY m p RR UE A AMP2 2 Relay SMPLHD2 EPROM Jumpers Shown in Default Positions Transistor Heat Sink PNPTRAN Br
63. for dust hair lint or other foreign matter If the Main board surfaces require more cleaning then scrub the surface with a soft rubber eraser and blow on or vacuum the surface while dusting it with a smal clean brush If the hybrid and elastomer contact holders are contaminated then flush or spray the holders with alcohol Do not scrub with a cotton tipped swab or similar device since cotton fibers may adhere to the contacts Special care must be taken to ensure correct index alignment of each Hypcon part while reassembling since failure to do so can result in cracked hybrid substrate Steps 1 3 are not necessary if you are replacing the hybrid only Step 1 Grasp a corner of the elastomer with the tweezers and place the elastomer into the plastic frame Step 2 Align the keyed corner of the elastomer with the keyed corner of plastic frame Step3 the elastomer into the plastic frame uniformly Note Keeping the elastomer clean is very important Small hairs and elastomer flash under the contacts can prevent good electrical contact Most apparent failures of the hybrid are due to contamination of the Hypcon 11A16 Service Reference 3 27 3 28 L Step 4 Place the hybrid into the square hole in the Main board The hybrid is keyed so that it will fit into the Main board in only one orientation When the back of the hybrid rests on the heatsink pedestal the top of the hybrid should be flush wit
64. g information in your order Part Number m Instrument Type or Model Number Instrument Serial Number instrument Modification Number if applicable If a part you order has been replaced with a different or improved part your local Tektronix service center or representative will contact you concerning any change in the part number Change information if any is located at the rear of this manual Module Replacement The 11 16 Two Channel Amplifier is serviced by module replacement so there are three options you should consider Module some cases you may exchange your module for a remanufactured module These modules cost significantly less than new modules and meet the same factory specifications For more information about the module exchange program call 1 800 TEKWIDE extension BV 5799 Module Repair You may ship your module to us for repair after which we will return it to you New Modules You may purchase new replacement modules in the same way as other replacement parts Using the The tabular information in the Replaceable Parts List is arranged for quick Replaceable retrieval Understanding the structure and features of the list will help you find the Parts List all the information you need for ordering replacement parts 11A16 Service Reference REV JUL 1991 Item Names In the Replaceable Parts List an Item Name is separated from the description by a colon Because of spa
65. gitizing Signal Analyzers CSA 404 Communications Signal Analyzer Current Probe A6302 or A63032 Tektronix A6302 with serial number dl above 050000 or A63032 probes Leveled Sine Wave 260 kHz to 250 MHz TEKTRONIX SG 503 Leveled Sine ad Generator Leveled variable Wave Generator with a TM 500 Series amplitude 50 kHz ref Power Module Power Supply Continuously variable from TEKTRONIX PS 503A Dual Power 2 0 40 V current limit ply with a TM 500 Series Power Mod adjustable from 0 400 mA ule 20 V at 400 mA with over current protection DC Voltage Calibrator Output 0 4 V accuracy Fluke 5101B Fluke 343A portable and short term stability gt 0 05 Data Precision 8200 Digital Multimeter Accuracy lt 0 01 Fluke 8842A Digital Multimeter d with test leads Calibration Generator Period 10 ms to 1 us TEKTRONIX PG 506A Calibration i Amplitude fastrise mode Generator with a TM 500 Series lt 1 ns 1 V Standard Power Module mode 200 uVp p to 5 Vp p into 50 Square wave output 0 25 accuracy 1 2 5 amplifier selection Voltage Adapter BNC to 12 pin current Tektronix Part 015 0598 00 i probe connector 11A16 standard accessory A6302 Current probes with Serial Numbers greater than BO50000 have nickel plated connectors which provide better shield grounding and superior immunity to electromagnetic noise 246303 Current probes should be calibrated with the procedure on page 2 6 before use in the verification procedures
66. h the top of the Main board Step 5 Place the plastic frame with the elastomer installed over the hybrid so that the key pointed tab aligns with the corner arrow on the board Step 6 Replace the four Torx head screw washer assemblies and apply two inch pounds of torque 2 3 cm kg to secure the connector assembly Do not overtighten the assembly as this may strip the microcircuit stiffener heatsink mounting threads Hemoving Replacing the Main Board See Figures 3 3 3 8 3 10 3 11 3 12 and the exploded view in the Rep aceable Parts section for connector screw and index locations The Darlington transistor pairs including their heatsinks must be saved for use on the new Main board Remove the Main board as follows EX E P Step 1 Disconnect the multi pin connectors that connect from the Front Panel boards to the Main board Note the position of the multi pin connector index triangle to ensure proper reassembly Step 2 Disconnect the 10 pin probe connectors from the Main board Disconnect the coaxial cables from the Main board and Attenuator boards Step 3 Remove the four screws that secure the Darlington Pair transistor heatsinks to the top and bottom side rails Step 4 Remove the four Torx head screws that secure the plastic rear panel to the top and bottom frames Step 5 Carefully pull the rear panel lock pin out of the alignment hole in the Main board and remove the plastic rear p
67. ibration error Ensure that Enhanced Accuracy is in Manual mode by checking the Instrument Modes or Modes pop up menu of the Utility 1 major menu Errors can occur if Enhanced Accuracy is automatically invoked during probe Calibration Step 2 Initialize the mainframe settings in the Utility menu Step 3 Press the CH 1 display On Off button to display CH 1 Checks and Adjustments Procedure 13 Probe Calibration Step 4 Press the DEGAUSS button Let the probe warm up for 10 minutes Step 5 Install the Current Loop Adapter on the mainframe CALIBRATOR output BNC Attach the current probe head to the test bar of the Current Loop Adapter The arrow on the probe indicates the direction of positive current flow The arrow must be pointing away from the mainframe Step 6 Select the Probes pop up menu in the Utility 1 major menu Step 7 Select the probe channel in the Calibrate Deskew and Compensate Probes section of the Probes pop up menu located in the UTILITY major menu For example C1 for center plug in compartment CH 1 If the polarity of the probe is incorrect or if the probe is not properly connected the following waming message is displayed during the calibration Connect Probe to Calibrator and Restart Operation Correct this problem by reversing the current probe connection and restarting calibration L Step 8 Examine that one of the following messages is displayed after probe Calib
68. ie ES eR RR Nu dv ag eae 4 Wire Step 2 Examine that CH 1 input resistance is 50 within 0 75 Step 3 Repeat Input Resistance Check Step 2 with the Vert Size set to 500 mV div then 50 mV div Step 4 Move the Voltage Adapter from CH 1 to CH 2 and repeat Steps 2 and 3 for the CH 2 input 2 20 Checks and Adjustments Procedure 6 This procedure shows the setup and lists the steps necessary to check DC DC Balance balance Its purpose is to confirm that DC balance be accomplished accurately The position of the displayed trace with no input signal applied is examined This procedure must be performed immediately 5 minutes after Enhanced Accuracy calibration Specification Refer to Table 2 4 Setup to Check DC Balance Mainframe Steps Necessary to Check DC Balance Step 1 First run the Enhanced Accuracy calibration if it has not been run over 5 minutes by pressing the ENHANCED ACCURACY button twice in succession Enhanced Accuracy is achieved after several minutes Step 2 Initialize the mainframe settings then perform the following settings in the order listed Center plug in CH 1 Display on off MOTO PD ODE VE esky orien seu on Mainframe Verm SIZE Sp ae C 1 U div Mail POS hen wate Soda wie bees Seed 25 5 us WAVEFORM major menu BW Limit 11400 tattoo ete oo eae ees 20 MHz Input Parameters DSA 600 touch
69. index codes The error index code tables list the hybrid integrated circuit IC module or board FRU s suspected of causing each error The FRU s in each category are listed in most to least probable cause assuming only one error is indicated If any errors occur inspect the suspect FRU for loose connections and components and then repeat the diagnostic test If any errors recur then replace the suspect FRU s with a good FRU s Verify that the new FRU is a correct replacement for the old FRU If the old FRU contains firmware be sure that the new firmware version is either the same or updated Abbreviations of FRU Names Table 3 5 Board FRUS lists the abbreviation used in the Suspect Board FRU S column of Tables 3 1 3 2 and 3 4 Table 3 5 Board FRU setebeletugesnaratatetcteteteteseccteteanssconetagsserereres eussaseseyecereivans te Abbreviation Name Designator Main Main board 1 1 amp 2 Attenuator boards A1A4 SMPLHD1 amp 2 Sample amp Hold boards A1A1 A1A2 FPB Front Panel boards A2 A3 Abbreviations of Component Names Table 3 6 Component Module FRUS lists the abbreviation used in the Suspect Module Hybrid or IC FRU s column of Tables 3 1 3 2 and 3 4 Table 3 6 Component Module FRUs RE RE EES Abbreviation Name Designator 1 Tek M377 Vertical Amplifier CH 1 U220 AMP2 Tek M377 Vertical Amplifier CH 2 U260 ATTN1 Atten
70. indicators and connectors for example MEASURE on the mainframe and amplifier m Bold letters identify menu labels display messages and commands selectable from the mainframe touch panel Initial Capital letters identify connectors controls and indicators for example Position on associated test equipment Initial Capital letters also identify adjustments inside the amplifier for example Vert Pos m Insome steps the first word is italicized to identify a step that contains performance verification and or an adjustment instruction For example if Check is the first word in the title of a step an electrical specification is checked If Adjust appears in the title the step involves an electrical adjustment If Examine is the first word in the title the step involves measurement limits that are used as calibration guides These limits are not to be interpreted as electrical specifications Initial Mainframe Settings At the beginning of most procedures you are instructed to Initialize the mainframe as part of the setup The Initialize feature available through the UTILITY menu presets all mainframe and plug in unit controls and functions to known values Initializing the instruments at the beginning of a step eliminates the possibility of settings from previous steps causing erroneous or confusing results For more information on initialization refer to your mainframe User Reference manual Menu Selections and Measuremen
71. ion 3 12 Removing Replacing FRUS 3 13 Removing Replacing an Attenuator board 3 16 Removing Replacing the Connector Assembly 3 17 Removing Replacing a Darlington Power Transistor 3 20 Removing Replacing a Sample Hold board 3 20 Removing Replacing the Front 3 21 Removing Replacing a Front Panel board 3 24 Removing Replacing a 3 24 Removing Replacing the IC Heatsink 3 24 Removing Replacing the Assembly 3 25 Removing Replacing the Main 3 28 Removing Replacing Multi Pin Connectors 3 31 Removing Replacing a Pin Jumper 3 31 Removing Replacing a Relay 3 31 Removing Replacing a DIP FRU IC 3 32 Removing Replacing a Slam Pack IC 3 33 Programming the Unit Identification 3 35 Theory of Operation Typical Signal Processing Cycle 4 1 Detailed Block Diagram Descriptions 4 2 Analog uode entr exceed ara ER Secr ote dee 4 2 Digita
72. ion occurs refer to Restoring Calibration Data in Section 3 Setup for Initial Setup Mainframe Steps Necessary for Initial Setup Step 1 Power on the following test equipment Power supply Calibration generator Leveled sine wave generator Digital multimeter Step 2 With the ON STANDBY switch set to STANDBY connect the mainframe to a suitable power source Step 3 Install the 11A16 in the Center plug in compartment Step 4 Set the front panel ON STANDBY switch to ON G Step 5 Allow equipment to warm up for 20 minutes before Continuing Checks and Adjustments Procedure 2 Enhanced Accuracy 11 16 Service Reference This procedure describes the setup and lists the steps necessary to check the Enhanced Accuracy state of the mainframe Its purpose is to verify that the Enhanced Accuracy state can be achieved by the mainframe and 11A16 When the mainframe and 11A16 achieve Enhanced Accuracy the mainframe will display the symbol EA The mainframe stores both the time of calibration and ambient temperature for use in maintaining the Enhanced Accuracy state For more information about the Enhanced Accuracy state see Enhanced Measurement Accuracy Indicator in your mainframe User Reference manual Specification When invoked the Enhanced Accuracy self calibration executes successfully Setup to Check Enhanced Accuracy Mainframe Steps Necessary to Check Enhanced Accuracy Step 1 Ini
73. ive Susceptibility to Damage from Static Discharge FRU Removal Replacement Procedure Cross Reference Board FRUs e ee 9 79 ee 9 9 9 eH 4 4 9 4 o 44 2 2 3 2 15 2 22 2 33 2 37 3 5 3 7 3 8 3 11 3 11 3 13 3 15 5 2 iii iV Contents General Information This reference provides service information and test procedures for the 11A16 Two Channel Current Amplifier It contains information necessary for qualified service personnel to check maintain and troubleshoot the 11A16 Checking the 11A16 involves performing a sequence of Check and Adjustment procedures These procedures verify that the 11A16 is operating Correctly The majority of Troubleshooting is based upon internal diagnostics that the mainframe and 11A16 perform automatically Some visual and mechanical troubleshooting may be necessary Both diagnostic techniques isolate problems to the field replaceable unit FRU level Once the faulty FRU is identified you can use the Corrective Maintenance section to remove and replace the faulty FRU The 11A16 is a two channel medium bandwidth current amplifier that plugs into any of the 11000 or DSA 600 Series mainframes that use amplifiers Commands from the mainframe control a
74. l CCUR cato vue irae AC Oa pe PC dr SO CE AUR 4 4 Front Panel BIOCK a wes s meme diac E Rb 4 4 CUITENL PODO o e Or CO eae CNN 4 4 Replaceable Parts Parts Ordering Information 5 1 Using the Replaceable Parts List 5 2 Change Information Contents List of Illustrations List of Tables 11 16 Service Reference Figure 1 1 Figure 2 1 Figure 2 2 Figure 2 3 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 Figure 3 14 Figure 4 1 Figure 4 2 Figure 5 1 Table 2 1 Table 2 2 Table 2 3 Table 2 4 Table 2 5 Table 2 6 Table 3 1 Table 3 2 Table 3 3 Table 3 4 Table 3 5 Table 3 6 Table 3 7 Table 3 8 Table 5 1 installing and Removing the 11A16 Location of Adjustments on the A6303 Current Probe Measurement of Plug in Contribution to Aberrations Waveform with DC Coupling Top and Coupling Sample LED Fault Code Timing Diagram FRU and FRU LOCATON ure ei rer eee ea RA ahs Removing Replacing an Attenuator Proper Orientation of the Current Probe Connector Installation Wiring for Current Probe Connector Removing Replacing the Front Panel Retainer Screws Removing Replacing the Probe Conn
75. l to Whole Zone in the Mean pop up menu Step 4 Set Compare to On For the 11400 Series select Stat Comp amp Def in the MEASURE major menu and then select Compare Options For the DSA600 Series select the second page of the MEASURE major menu then select Compare amp Defaults Step 5 Set Vert Size to the first Vertical Size entry in Table 2 5 Fine knob resolution will be required to select the 49 8 and 23 mV settings Step 6 Set the DC Voltage Calibrator polarity to minus then set its Output level to the appropriate Deflection Volts setting from Table 2 5 Step 7 Save the current Mean measurement as the reference value in the menu that you used to set Compare on in Step 4 Step 8 Set the DC Voltage Calibrator polarity to plus leaving its output level set to the Deflection Volts setting used in Step 6 el el er ce ES Step 9 Clear the waveform data by selecting Remove Clr Waveform then selecting Clear waveform name wfm 1 in the pop up menu This will restart waveform averaging and give a measurement based on the new input signal L Step 10 Now caiculate the difference between the delta mean value and the combined applied signal levels to get the AVDC error Read the current Mean measurement Divide the A Mean value by the mainframe characterization factor that you determined earlier in this procedure Subtract from this value 2 times the present Deflection Volts setting to obtain the AV DC erro
76. ling Step 8 Remove the Voltage Adapter from the CH 2 input Step 9 Set CH 2 Vert Size to 1 mU div Step 10 Step 11 Step 12 Step 13 Check that the trace is within 0 3 divisions of vertical center Set the CH 2 Display on off to off Set the CH 1 Display on off to on Repeat Steps 9 and 10 for CH 1 2 29 Procedure 10 This procedure shows the setup and lists the steps necessary to check AV DC AV DC Accuracy Accuracy Its purpose is to confirm that the 11A16 can be accurately calibrated Check AV DC Accuracy immediately after an Enhanced Accuracy calibration Before checking AV DC Accuracy you must characterize your mainframe by using the following procedure that corresponds to your mainframe series Specification AV DC Accuracy within 0 53 from 2 mV to 2 V div within 0 78 at 1 mV div Setup to Characterize the 11400 or DSA 600 Series Mainframe dm Calibrator Output Mainframe BNC to Banana Adapter HI Digital 55 Multimeter O LO Coaxial Cable Steps Necessary to Characterize the 11400 Series Mainframe 1 Step 1 Set the following parameters 2252550 ames no setting changes Digital multimeter DMM MOGE eg pac Gedo tc us dea oed DC i e cC Em Auto Range 10 V Mainframe UTILITY major menu Extended Diagnostics SUBSYSTEM c b orar n eee Y dex Ae doen Digitizer BIOCK Lets Points Acq PICA ou ou sod
77. ll 11A16 functions except probe degauss For example combination of the two input channels can be provided to the host mainframe Signals can be independently inverted and summed m Channel bandwidth limiting can be switched between 20 and 50 MHz The front panel of the 11A16 has two buttons and an LED indicator for each input channel Other controls and status indicators are located on the mainframe Each channel has a 12 pin input connector When a probe is connected to the input the 11A16 detects the probe encoding information to select the appropriate scaling This reference contains the following sections General Information describes information that you should know about the 11A16 before you service it such as safety information installation and removal available options and packaging suggestions m Checks and Adjustments provides you with procedures to examine the measurement limits and electrical specifications of the 11A16 Maintenance contains information necessary to do preventive maintenance remove replace field replaceable units FRUS and diagnose faulty FRUS m Theory of Operation describes the general operation and signal path of the 11A16 Replaceable Parts provides you with a complete list of replaceable electrical and mechanical parts found on the 11A16 11 16 Service Reference 1 2 Safety Summary This general safety information is directed to operators and
78. m the printed tag on the 11A16 rail near the Front Panel Step 4 Install the 11A16 in any compartment Step 5 Set the ON STANDBY switch to ON Step 6 Wait until the diagnostic tests are completed DETENTE Step 7 On your terminal type the command UID Left Center Right lt Serial Number gt Left Center Right refers to the compartment that the 11A16 resides Step 8 On the terminal type the query UID Center Right Observe that the correct UID is reported Step 9 Set the ON STANDBY switch to STANDBY Step 10 Remove the 11A16 LJ Step 11 Return the jumper J990 on the Main board to its normal operating position across pins 2 3 Reset the mainframe Cal Lock jumper to its normal position You can use this procedure to confirm the UID by repeating all steps except Step 6 11 16 Service Reference 3 35 3 36 Maintenance Theory of Operation Current Probe Connectors Typical Signal Processing Cycle 11 16 Service Reference This section provides a typical signal processing cycle and descriptions of the major circuitry blocks of the 11A16 Two Channel Current Amplifier Figure 4 1 shows the functional blocks of the 11A16 CH 1 CH 2 Probe Amplifier To From Mainframe Front Panel Control To Main Mainframe Amplifier CH1 Aux CHT Display Trigger 2 Figure 4 1 11A16 System Function
79. mit none at 100 MHz limit none d 2 45 ns lt rise time lt 4 55 ns at 20 MHz limit 12 3 ns lt rise time lt 22 7 ns Procedure 9 AC Coupling none bottom of square none wave at center graticule line then waveform vertically centered on screen Procedure 10 AV DC none 2 mV 2 Vidiv none Accuracy x 0 5396 1 mv 0 78 Procedure 11 DC Offset none refer to Table 2 6 none Accuracy Procedure 12 Degauss none signal trace zero none _ Ability Procedure 13 Probe none successful auto Calibration calibration 2 2 Checks and Adjustments Test Equipment Table 2 2 Test Equipment lists recommended test equipment for use when checking and or adjusting the amplifier The Functional Test column of Table 2 2 indicates with a check mark 77 the test equipment that is recommended if you are performing a functional test only Check and Adjustment steps are based on the test equipment examples given but other equipment with similar specifications may be substituted If you use different equipment this may alter test results setup information and required connectors and adapters Description Minimum Examples of Recommended Functional Specification Test Equipment Test 11400 or DSA 600 Series mainframe that TEKTRONIX Mainframe that accepts accommodates amplifiers 11401 Digitizing Oscilloscope amplifiers 11402 Digitizing Oscilloscope 11403 Digitizing Oscilloscope 11403A Digitizing Oscilloscope DSA 600 Series Di
80. mpartment in which the 11A16 is installed L Left C Center R Right The tables in this section list the four digit failure code only the prefix L C or R is omitted Front panel controls are active during the Self Test sequence and any disturbance could cause a test failure Error index codes are divided into three tables Kernel test error codes Table 3 1 Self Tests Extended Diagnostic error indexes Table 3 2 and Enhanced Accuracy error indexes Table 3 4 Each table lists suspect FRUs in the order of highest to lowest probability For FRU identification and replacement information refer to page 3 11 Table 3 1 lists the error codes that result from the Kernel Tests Error Code Suspect Module Suspect Board Hybrid or IC FRU s 1 EPROM MPU Main 2 NVRAM Main 3 SDI MPU Main 11A16 Service Reference 3 5 3 6 Table 3 2 lists the error codes that result from the Self Tests and Extended Diagnostics Table 3 2 eee ier E Error Index Codes Error Code Bue Module Suspect B Board Hybrid or IC FRU s 1111 Main 11211 Main 11311 NVRAM Main 1211 Main 1221 FUSE Main 1311 SDI SMPLHD12 SMPLHD22 Main 1811 Main 1821 Main 1831 Amp Main 1841 Amp Main 1851 Amp Main 1861 Amp Main 1871 Main 1881 Main 1891 Main 18A1 Main When the NVRAM is replaced a new User Identification UID must be entered before this error can be cleared See Programming the Unit Identification page 3 35
81. ne from left edge of graticule The following settings will horizontally expand the displayed waveform Mainframe Main Size 2 or 5 ns div depending on mainframe Main Pos position positive going edge between the first and second graticule lines from the left edge of the graticule Vert Offset position top of step 2 5 divisions above the center horizontal graticule line WAVEFORM major menu Acquire Desc pop up menu Average N 5 QUA EE See d RR RO s On DOU 0a TL e 8 Vertical Size resolution 11400 Vert Size knob label touch Numeric Entry amp Knob Res pop up menu Fine Vertical Size DSA 600 Vert Size FINE button press Vert Size Fine knob 5 division step amplitude display Vert Offset Coarse knob position top of trace to the center horizontal graticule line The following settings will vertically expand the displayed waveform Vert Size Coarse set to 10 of present readout 10 mV div Vert Offset Coarse position top of trace to the center horizontal graticule line Step2 Examine the displayed system response waveform and measure the aberrations The aberrations should be within 596 peak 2 5 divisions and 896 peak to peak 4 divisions You can use AVert cursors or Horizontal Bars to measure this amplitude
82. ne maie BNC connector BNC Two female connec tors 6 tip 8 tip 10 tip 10 tip narrow shank 15 tip IC insertion extraction pliers 28 pin type Tektronix Part 015 0601 00 11A16 standard accessory Tektronix Part 012 0482 00 Tektronix Part 012 0057 01 Tektronix Part 011 0076 02 Tektronix Part 011 0060 02 Tektronix Part 011 0059 02 Tektronix Part 103 0090 00 Tektronix Part 103 0030 00 Tektronix Part 103 0028 00 Tektronix Part 003 1415 00 Tektronix Part 003 0964 00 Tektronix Part 003 0814 00 Tektronix Part 003 0815 00 Tektronix Part 003 0966 00 General Tool P N U505BG or equivalent 2 4 Checks and Adjustments Using These The first time user should familiarize themselves with the information below prior Procedures to performing the procedures that follow At the beginning of each Check and Adjustment procedure a short narrative describes the purpose of the procedure The next section labeled Measurement Limit gives the proper range for a specification A Specification section gives the result a procedure should produce Then a Setup to section provides a figure that shows test equipment setup and connection The final section labeled Steps Necessary To Check lists the steps required to check the 11A16 specification Conventions in this Manual In these procedures the following conventions are used m CAPITAL letters within the body of text identify front panel controls
83. nected to the input connector Main Amplifiers amplify the difference between the input channel signal and the DC offset voltage by 1 2 5 5 10 25 or 50 thus providing gain switching to the input signals The Channel 1 and Channel 2 amplifiers each produce three output signals Display Trigger and CH 1 and CH 2 auxiliary signals respectively The Display and Trigger signals from CH 1 and CH 2 are connected together summed Each of these signals can be independently inverted or switched off An Input Overload Detection block protects the attenuator and amplifier from input voltage levels in excess of 2 V peak 1 mA 50 mA div and input power levels in excess of 2 0 W peak 100 mA 2 A div The ADC reads the analog probe data current voltage probe sense overload detector output zero voltage and assorted diagnostic signals and converts these to digital signals These signals are monitored by the MPU The DAC converts digital data originating from the MPU into analog control voltages for the Hall Effect device Amplifier the Power Amplifier and the Main Amplifier The Halt Effect Device Amplifier amplifies the small input signal originating from the Current Probe Effect Sensor by 100 The Power Amplifier increases the Hall Amplifier signal to a level capable of driving the Current Probe winding with current levels up to 250 mA The Degauss Signal Block generates a 180 Hz signal with an expone
84. nter or representative will contact you concerning any changes Static Sensitive Device Classification static discharge can damage any semiconductor in the 11A16 The 11A16 contains electrical components that are susceptible to damage from static discharge Refer to Table 3 7 Relative Susceptibility to Damage from Static Discharge for the relative susceptibility of various classes of semiconductors otatic voltages of 1 kV to 30 kV are common in unprotected environments Observe the following precautions to avoid damage Minimize handling of static sensitive components Transport and store static sensitive components or assemblies in their original containers either on a metal surface or conductive foam Label any package that contains static sensitive assemblies or components Maintenance Removing Replacing FRUs 11 16 Service Reference m Wear a wrist strap while handling these components to discharge the static voltage from your body Servicing static sensitive assemblies or components should be performed only at a static free work station The use of the static control mat is recommended Clear anything from the work station surface that is capable of generating or holding static charge m Keep component leads shorted together with conductive foam m Pick up components by the body never by the leads m Do not slide components over any surface Avoid handling components in areas that have a floor or a work sur
85. ntially decreasing amplitude This signal drives the Power Amplifier when the FET switch is open Its purpose is to demagnetize the core of a connected Current Probe The Output Zero Block provides feedback to the ADC and MPU when the degauss function is invoked This information is required to accurately zero the display trace during the Deqauss Cycle 11A16 Service Reference 4 3 Digital Circuitry The Digital Circuitry Kernel block performs the following major functions m Monitors the front panel buttons and probe information Interprets commands from the mainframe then sets the appropriate signal path configuration Controls the Analog Control Voltage System ACVS m Manages the amplifier diagnostics and calibration The MPU receives information from the mainframe that allows it to control the amplifiers and the attenuators The EPROM stores the program code The MPU uses this code to execute its functions The NVRAM stores information such as the amplifier calibration constants the amplifier serial number probe calibration constants and the ID of the most recent host mainframe The Serial Data Interface 501 or Housekeeping IC controls the Main Amplifier the DAC and an array of sample and hold circuits to create 16 analog control voltages ACVS When more than one channel is ON the MPU stores the channel switching sequence in the SDI IC The SDI IC contains a receiver and transmitter for s
86. ove an Attenuator board as follows L Step 1 Disconnect the coaxial connector from the input of the Attenuator board L Step2 Carefully desolder the Attenuator board from the Main board Removal is easier if you first cut the pins at the base of the Attenuator board then desolder and pull each pin free from the Main board Relay K3 Relay K2 Attenuator Board Relay K4 EEs Relay K1 Input Coaxial Cable With Yellow Stripe Main Board Coaxial Connector Figure 3 3 Removing Replacing an Attenuator Step 3 Remove the Attenuator board from the Main board Replace an attenuator as follows Step 1 Align the Attenuator board square pins with the cleared holes on the Main board The fifth pin is missing to aid in alignment C Step 2 Note the proper orientation then insert the Attenuator board into the receptacle on the Main board Do not apply force to any subcomponents on the Attenuator board 1 Step 3 Resolder the Attenuator board pins to the Main board connections 3 16 Maintenance Step 4 Reconnect the coaxial connector to the input of the Attenuator board When engaging these connectors use the following precautions m Ensure that the center conductor of the cable is straight If necessary straighten the conductor with clean pliers to avoid contamination Insert the connector straight into the receptacle While you insert the connector look through the slot in the o
87. pop up menu Average iocos ste RUE p RP ER en On If the environment is electrically noisy connect a capacitor at least 0 1 uF across the input terminals of the DC Voltage Calibrator Step2 Press the Enhanced Accuracy button twice Immediately after self calibration has completed and passed perform this procedure for each channel Step 3 Select the Mean measurement in the MEASURE major menu and set the Data Interval to Whole Zone in the Mean pop up menu 2 36 Checks and Adjustments Procedure 11 DC Offset Accuracy Step 4 Set Compare to On For the 11400 Series select Stat Comp amp Def in the MEASURE major menu and then select Compare Options For the DSA600 Series select the second page of the MEASURE major menu then select Compare amp Defaults Step 5 Save the current AMean measurement as the reference value in the menu in which you set Compare to on in Step 4 Step 6 Set Vert Size to the first Vertical Size entry in Table 2 6 Step 7 Set Vert Offset to the corresponding Vertical Offset from Table 2 6 Step 8 Set the DC Voltage Calibrator to the current Vertical Offset divided by the characterization factor which you computed earlier in this procedure ij Step 9 Clear the waveform data by selecting Remove CIr Waveform then selecting Clear waveform name wfm 1 in the pop up menu This will restart waveform averaging and give a measurement based on the new input signal Step 10 Rea
88. pushbuttons facing upwards This will allow the Main board to be slid into place component side up Step 2 Carefully insert the Main board between the frames until the plastic rear panel contacts the top and bottom frames The board fits atop the center ridges on the top and bottom frames If you are installing a new Main board first attach the plastic rear panel from the old board to the new Main board The rear panel helps position the Main board when its rear panel lock pin is correctly seated in the Main board Step 3 Replace the four Torx head screws that secure the heatsink bracket to the top and bottom frames The heatsink bracket and the rear panel ensure correct front back position for the Main board Refer to Figure 3 8 for screw placement If you are installing a new Main board first mount the large flat heatsink bracket from the old board on the back of the new Main board Heatsink installation is described on page 3 24 Step 4 Replace the four Torx head screws that secure the rear panel to the top and bottom frames L Step 5 Replace the six Torx head screws and nut blocks that secure the Main board to the top and bottom frames 1 Step 6 Replace the four screws that secure the Darlington Pair transistor heatsink to the top and bottom rails If the transistors are already soldered into the Main board loosen the screws holding the transistors to their heatsinks before attaching the heatsinks to the sid
89. r 1 Step 11 Check that the AV DC error obtained in Step 10 is within the Error Limits given in Table 2 5 Step 12 Repeat Steps 5 through 11 for all Vertical Size settings listed in Table 2 5 Table 2 5 1 16 DC 1 Error Limits Vertical Size Deflection Volts Error Limits 1 V div 4V 42 4 mV 100 mV div 400 mV 42 4 mV 50 mV div 200 mV 1 06 mV 49 8 mV div Fine res 200 mV 1 06 mV 23 mV div Fine res 92 mV 98 mV 20 mV div 80 mV 85 mV 10 mV div 40 mV 42 mV 5 mV div 20 mV 21 mV 2 mV div 8 mV 085 mV 1 mV div 4 mV 062 mV 11A16 Service Reference 2 33 Procedure 11 This procedure shows the setup and lists the steps necessary to check DC DC Offset Accuracy Offset Its purpose is to confirm that the amplifier can be accurately calibrated This procedure does not test the mainframe calibration voltage reference accuracy or long term stability Therefore before checking DC Offset Accuracy you must characterize your mainframe by using the procedure corresponding to your series of mainframe Check DC Offset Accuracy immediately after an Enhanced Accuracy calibration Specification Refer to Table 2 6 Setup to Characterize the 11400 or DSA 600 Series Mainframe Calibrator Output Mainframe BNC to Banana Adapter Digital 2 Multimeter Coaxial Cable Steps Necessary to Characterize the 11400 Series Mainframe This characterization procedure is identical to that performed in P
90. racterization factor 2 31 Procedure 10 AV DC Accuracy Setup to Check the 11A16 AV DC Accuracy Voltage Adapter Mainframe BNC to Banana Adapter Coaxial Cable DC Voltage 2 Calibrator HI re s 2 ultimeter BNC to Banana cs CE and BNC T Adapters T LO e Coaxial Cable Steps Necessary to Check the 11A16 AV DC Accuracy Step 1 First Initialize the mainframe settings then perform the following settings in the order listed Center plug in CAH T Display on Mainframe WAVEFORM major menu BW Limit 11400 20 MHz Input Parameters DSA 600 touch Bandwidth 20 MHz Acquire Desc pop up menu Average E EUR EIS EAE AS On DC Voltage Calibrator On stendbVy us e Sock ack Gyo tte re rd ee indeed tus as on SO OL OVEITICIB Rea ULCUS DAC on If the environment is electrically noisy connect a capacitor at least 0 1 uF across the input terminals of the DC Voltage Calibrator Step2 Press the Enhanced Accuracy button twice to initiate Enhanced Accuracy calibration and ensure peak performance of the system Immediately after self calibration has completed and passed perform this procedure for each channel 2 32 Checks and Adjustments Procedure 10 AV DC Accuracy Step 3 Select the Mean measurement in the MEASURE major menu and set the Data Interva
91. rame zeros the displayed waveform to the horizontal center line within A6302 0 25 0 1 div A6303 1 0 mA 0 1 div Setup to Check the 11A16 degauss Ability Mainframe Current Probe Steps Necessary to Check degauss Ability Step 1 First run the Enhanced Accuracy calibration by pressing the ENHANCED ACCURACY button twice in succession Enhanced Accuracy is achieved after several minutes Step 2 Initialize the mainframe settings then perform the following settings in the order listed Center plug in GEH T DISDIAy OMNO ee e ERE REA on Mainframe Input Parameters DSA 600 touch Coupling C1 and 2 DC Coupling 11490 lt i cha she pedites env Bee ae me pie DC Mert SIZE Lodo ao bg sca s Er 1 mA div 5 mA div for A6303 Main 26 n ee Ru aded ecce eh aM 5 ms div 2 38 Checks and Adjustments 11 76 Service Reference a ed hl C3 E LT EE Procedure 12 Degauss Ability Acquire Desc pop up menu Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Average SUL AVO TIU es de oni reer ne ee ee atate eee ae 32 Ensure that the jaws are closed then press the DEGAUSS button Examine that the message DAC Overflow is not displayed Set Coupling to OFF Adjust Vert Offset so that the trace is on the center graticule Set Coupling to DC Press the DEGAUS
92. ration and deskewing complete Probe Cal Complete Deskew Passed 6302 or Probe Cal Complete Deskew Failed A6303 NOTE f you are using an A6303 probe or an A6302 with a cable longer than 2 meters the Deskew portion will likely fail due to the long time delay through the probes The failure is due to the 15 ns deskew limit of the mainframe and is acceptable Ignore the Compensation message since no compensation is required for a current probe C Step 9 Move the current probe to CH 2 and repeat Steps 2 through 7 for the CH 2 probe Step 10 To complete the procedure remove the Current Loop Adapter and exit the Probes pop up menu by selecting Exit Comp If Enhanced Accuracy is invoked when the Current Loop Adapter is attached calibration can be corrupted 11 16 Service Reference 2 41 Procedure 13 Probe Calibration 2 42 Checks and Adjustments Maintenance Preventive Maintenance Q icanon 11 16 Service Reference This section provides you with preventive maintenance ordering information sensitive component information techniques to remove replace the FRUs and troubleshooting of the 11A16 Corrective Maintenance is limited to the replacement of FRUs or modules Service beyond this level must be done by your Tektronix service center Preventive maintenance can prevent the 11A16 from failing and increase its reliability Cleaning and visual inspection is all that is required for preventive
93. rocedure 10 You can use the mainframe calibration voltage reference characterization factor computed in Procedure 10 for the verification portion of this procedure Step 1 Set the following parameters Center plug in Digital multimeter DMM MOG Join Gis ewe peer soot Oe beeen aaa eh wh eee DC i q ae beds E ERA Auto Mainframe UTILITY major menu Extended Diagnostic SUBSYSTEM aeons seed Digitizer BIOCK cu sud Eva duro e audias Points Acq PICS vd osx pene uiid pt FP Cal Refs La ct FP 10 000 V HUI UL adire Se he bp Er er SEU io ovd ice diea touch 2 34 Checks and Adjustments 11 16 Service Reference Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Procedure 11 DC Offset Accuracy Record the DMM absolute value Press Exit Press FP 9 9951 V Press Run Record the DMM reading Press Exit Press Exit Diagnostics Add the absolute values of the DMM readings obtained in Steps 2 and 6 Divide the result by 19 9951 V to obtain the mainframe s calibration voltage reference characterization factor which is used in the Procedure to Test the Amplifier Steps Necessary to Characterize the DSA 600 Series Mainframe BARTER Step 1 Center plug in Set the following parameters 8 8 9 4 4 Mainframe UTILITY major
94. s Self Tests and Extended Diagnostics produce and format error index codes differently so these error index codes are discussed separately Kernel Tests Kernel Tests are done each time the front panel ON STANDBY switch is set to ON The mainframe and 11A16 perform Kernel Tests on their microprocessor subsystems and Self Test Diagnostics on all major circuits Turning the mainframe power off during the execution of the diagnostic tests may result in losing some or all of the non volatile RAM NVRAM data for example calibration constants This loss of data may cause the mainframe to operate unpredictably If this occurs refer to Restoring Calibration Data later in this section If any of the kernel tests fail then it is unlikely that the 11A16 can communicate failure information to the mainframe The flashing of a fault code on the front panel CH 1 and CH 2 LEDs indicates which kernel test is failing Maintenance On CH1 LED Off Count On CH2 LED Off 11416 Service Reference The following description explains how to read the fault code If the 11A16 Kernel tests detect a fault then the CH 2 LED is flashed eight times If the CH 1 LED is flashed during a cycle of the CH 2 LED then the test corresponding to the current count is the one that failed Refer to the timing diagram in Figure 3 1 for an example LED fault code The timing diagram illustrates a test number 2 failure e 1 2 3 4 5 6 7 8 JLILILILILIL
95. service personnel Specific warnings and cautions will be found throughout the manual but may not appear in this summary Terms in Manuals CAUTION statements in manuals identify conditions or actions that could damage the equipment or other property WARNING statements in manuals identify conditions or actions that could result in personal injury or Joss of Terms on Equipment CAUTION warns you of possible hazards to the equipment or yourself though you are not exposed as you read the marking DANGER warns of a personal injury hazard as you read the marking Symbols in Manuals 9 Static Sensitive Devices Symbols on Equipment 4 AN DANGER Protective ATTENTION High Voltage ground earth Refer to terminal manual Power Source This 11A16 is intended to operate in a mainframe connected to a power source that will not apply more than 250 V rms between the supply conductors or between either a supply conductor and ground A protective ground connection through the grounding conductor in the mainframe power cord is essential for safe system operation Grounding the 11A16 The 11A16 is grounded through the grounding conductor of the mainframe power cord To avoid electric shock plug the mainframe power cord into a properly wired receptacle before installing the 11A16 A protective ground connection through the grounding conductor in the mainframe power cord is essential for safe operation General Informa
96. slots in the front subpanel If needed carefully pull the top and bottom frames away from the subpanel to allow the front panel tabs to fit between the casting and the frames Remove the screws holding the transistor heatsinks to the side rails if more than 1 8 spreading is necessary Maintenance Step 6 Carefully press the edges of the front panel into place around the push buttons and the outer edges of the front panel Step 7 Replace the four Torx head screws that secure the front subpanel to the top and bottom frames Step 8 Replace the release bar return spring orienting the spring so that its loop fits over the frame hook flat against the frame section Front Panel Board Torx Head Screws 4 Front Subpanel A2 Front Panel Board Front Panel Front Panel Board CH1 Probe Connector Assembly Torx Head Screws 4 CH2 Probe Connector Assembly Torx Head Screws 4 O O U tu V Figure 3 7 Removing Replacing the Probe Connectors Front Panel and the Front Panel Boards 11A16 Service Reference 3 23 3 24 Removing Replacing a Front Panel Board See Figures 3 7 3 6 and 3 12 for connector screw and index locations A conti nuity check between the Front Panel and Main board connector will verify a fault Remove and replace the Front Pane board as follows Step 1 Disconnect the multi pin connector that connects from the Front Panel board to the Main board Note the
97. stor leads in the appropriate Main board holes then install the heatsink on the plug in side rail Step 4 Solder the transistors to the Main board Now tighten the Torx screws securing the Darlington Pair transistors to the heatsink This assembly order minimizes stress on the transistor leads Removing Replacing a Sample and Hold Board The diagnostics are the primary means for troubleshooting Sample and Hold boards Hefer to Figure 3 2 to identify the two Sample and Hold boards Remove a Sample and Hold board as follows C Step 1 Carefully desolder the Sample and Hold board from the Main board Step 2 Remove the Sample and Hold board from the Main board taking care not to pull any pads loose Replace a Sample and Hold board as follows L Step 1 Align the Sample and Hold board square pins with the cleared holes on the Main board The gap in the line of pins ensures correct mounting Maintenance 11 16 Service Reference Step 2 Note the proper orientation then insert the Sample and Hold board into the receptacle on the Main board Do not apply force to any subcomponents on the Sample and Hold board Step 3 Resolder the Sample and Hold board pins to the Main board connections Removing Replacing the Front Panel See Figures 3 6 and 3 7 for connector and screw locations Remove the front panel as follows 1 Step 1 Unhook the return spring located on the bottom of the 11A16 from the release bar
98. strument s serial number If this value has been changed please write the serial number physically attached to the instrument mainframes front panel plug in units top rail SECTION B Use the complete company mailing address Include the name and phone number of the person reporting the error Also be sure to fill in the name of the person submitting the PR SECTION C Check the reason for the report and whether the problem is reproducible We cannot fix a problem when we cannot reproduce the problem condition SECTION D Give a complete description of the system configuration on which the problem occurred Include related peripherals interfaces options special switch and or strap settings and operating system SECTION E Describe the problem completely Include any information which might help in evaluating the error with the PR If you have determined a procedure to avoid the error condition please include this procedure If this problem prevents you from accomplishing any useful work with the product please state this fact Be sure to include with the PR any information programs listings hard copies etc which will help us duplicate your problem SECTION F This section is for use by Tektronix Lab Instruments Marketing Support personnel DO NOT WRITE IN THIS SPACE Mail ali copies of the Problem Report to TEKTRONIX INC LAB INSTRUMENTS MARKETING SUPPORT P O BOX 500 DEL STA 39 327 BEAVERTON OREGON 97077
99. t Techniques Details on measurement techniques and instructions for making menu selections are generally not included in this procedure Comprehensive descriptions of menus and instrument features are located in your mainframe User Reference manual 11 16 Service Reference 2 5 2 6 A6303 Current Probe Adjustment Voltage Adapter This procedure adjusts the A6303 for optimum operation in an 11A16 Amplifier You should adjust an A6303 if it will be used in the following verification procedures This procedure assumes a fully calibrated 11A16 is installed in the Right plug in compartment of a 11400 or DSA 600 Series mainframe The equipment required and its connection are shown in the setup illustration below Setup for A6303 Current Probe Adjustment Current Loop Mainframe Adapter Calibration Generator Jj Coaxial Cable Not Initially Connected Current Loop Adapter Should be Orientated in Direction of Current Flow A6303 Current BNC Barrel Probe BNC Barrel Use the 0 Current Loop Adapter with the 11A16 Amplifier only during probe calibration If the adapter is connected to the mainframe during power up or Enhanced Accuracy calibration the instrument calibration can be corrupted The adjustment procedure has three parts offset adjustment transient response adjustment and verification Procedure to Adjust Offset otep 1 Power up the oscilloscope mainframe 11A16 A6303 probe and
100. t the power is off then set a digital multimeter to the 1 range and measure the emitter to collector two outside pins resistance This should measure 2 or greater in circuit with or without a good fuse and if the transistors are not shorted collector to emitter the most common failure mode You can also identify the emitter and collector by the square board pad for the emitter and the the heatsink tab tied to the collector We recommend that both transistors of a pair be replaced even if only one appears defective Refer to Figure 3 2 and remove a transistor pair as follows Step 1 Remove the Tor screws that hold the transistor heatsink bracket to the plug in side rail Step 2 Remove the Torx screws that hold the transistor pair to the heatsink bracket Save the heat transfer material for reinstallation Step 3 Desolder the transistors from the Main board Replace a transistor by Step 1 Orient the new transistors properly onto the heatsink aligning the tab holes with the threaded hole in the heatsink Note that the NPN is on the right and PNP is on the left see Fig 3 2 Step 2 Place the heat transfer material between the transistor tab and the heatsink and install the Torx screws shoulder washers and flat washers to secure the transistors to the heatsink Do not tighten the screws at this time Refer to the exploded view Figure 5 1 Step 3 Place but do not solder the full length transi
101. that you install a good quality IC socket A socket saves wear and tear on the Main board when multiple exchanges of an IC are necessary See Figures 3 13 and 3 14 for equipment and indexing information Remove an FRU IC in a DIP socket as follows Step 1 Use IC insertion extraction pliers positioned around the outside of the IC Figure 3 13 shows an example of this type of pliers Step2 Squeeze the handles to grasp the lightly compressing the pins and slowly pull the IC from the socket Place the removed IC on a static free surface or IC holder Avoid touching the IC pins or socket contacts with your fingers Finger oils can lessen contact reliability Also touching the pins can induce static discharge damage should the IC need to be reused Replace an FRU IC in a DIP socket as follows Step 1 Place the IC on a static free surface then grasp the IC with the IC insertion extraction pliers ensuring that al the pins of the IC are straight and lightly compressed Do not use the IC label as an index instead locate the index on the body of the IC Step 2 Align the IC index slot with that of the socket Fig 3 14 gives an illustration of this indexing Step 3 Align the pins with their respective socket contacts Step4 Press the IC slowly and evenly into its socket Ensure that the IC is firmly seated in its socket 3 32 Maintenance 11A16 Service Reference Figure 3 13 IC Insertion Ex
102. tialize the mainframe settings from the UTILITY major menu Center Plug in Mainframe ee eth CE no setting changes no setting changes Step 2 Twenty minutes after power on the mainframe must recalibrate itself to achieve the Enhanced Accuracy state Press the ENHANCED ACCURACY button A prompt then appears on the display Press the ENHANCED ACCURACY button again Enhanced Accuracy is achieved after several minutes Turning the mainframe power off during Enhanced Accuracy testing may result in losing some of the non volatile RAM data This could cause diagnostic errors at the next power up and cause the mainframe to operate unpredictably If this event occurs refer to Restoring Calibration Data your mainframe Service Reference manual Step 3 Examine the display for the message Enhanced Accuracy Progress appears This indicates that the mainframe is performing self calibration io achieve Enhanced Accuracy Procedure 2 Enhanced Accuracy Step 4 Examine the display for an Enhanced Accuracy complete message indicating that the Enhanced Accuracy state has been achieved The EA indicator appears on the left portion of the display when Enhanced Accuracy is active 2 12 Checks and Adjustments Procedure 3 High Frequency Response 11A16 Service Reference This procedure shows the setup and lists the steps necessary to check the 11A16 high frequency response The proced
103. tion 11 16 Service Reference Danger Arising from Loss of Ground Upon loss of the protective ground connection all accessible conductive parts including knobs and controls that may appear to be insulators can render an electrical shock Do Not Operate in Explosive Atmospheres To avoid explosion do not operate this product in an atmosphere of explosive gasses Do Not Service Alone Do not perform internal service or adjustment of this product unless another person Capable of rendering first aid and resuscitation is present Use Care When Servicing with Power On Dangerous voltages exist at several points in this product To avoid personal injury do not touch exposed connections or components while the power is on Disconnect the power before removing protective panels or replacing componenis 1 3 Installing and Install the 11A16 in an 11000 or DSA 600 Series mainframe as follows Removing the 11A16 If the green indicator light remains on when the STANDBY position is selected then the switch was internally disabled when the power supply was serviced To enable the ON STANDBY switch refer to the Corrective Maintenance section of the Service Reference manual for your mainframe Step t Set the mainframe ON STANDBY switch to STANDBY Step2 Align the grooves in the top and bottom of the 11A16 with the guides in the mainframe plug in compartment Step3 Slide the 11A16 into the compartment until the
104. traction Pliers Removing Replacing a Slam Pack IC A Slam Pack IC is indexed to its socket by a beveled corner The other corners are notched to fit the edges of the socket The beveled corner aligns with a spring small metal tab at one comer of the socket Remove the Slam Pack IC as follows Step 1 To remove the retaining clip hold the heatsink cover in place and move the retaining clip off the tabs while pushing down slightly on the cover Step 2 Slowly remove the cover to prevent the IC from falling out Note the position of the index on the IC to ensure that this IC can be correctly replaced Step 3 Remove the IC with tweezers Avoid touching the IC or the socket contacts with your fingers Finger oils can lessen reliability Replace the Slam Pack IC as follows Step 1 Using tweezers place the beveled corner of the replacement against the index spring Do not damage the spring with the beveled corner this could cause a short in the two corner contacts Step 2 Using the tweezers arrange the other corners of the IC to fit evenly at the socket edges Step 3 Set the cover flat on the IC with the cover end tabs aligned with the mating recesses of the socket Be sure the end tabs are not inserted yet 1 Step 4 Push the cover down keeping the cover flat on the IC and slide the cover end tabs into place Hold the cover then move the retaining Clip over the tabs on the other end of
105. ts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Contents 11 16 Service Reference General Information Safety eee ye gard 1 2 Installing and Removing the 11 16 1 4 Memory Backup Power for the 11 16 1 5 Operating Environments osse t ERE OR 1 5 Packaging for 5 1 5 Instrument ODIO shat sea Tace mi RU ege nnn So ERE 1 6 Checks and Adjustments
106. ts the error codes that result from the Enhanced Accuracy tests Enhanced Accuracy is available after the system has a 20 minute warmup period Table 3 2 Enhance Accuracy Error Index Codes ttt A ALALA ALAA ALAARA a AA nA s CN n L ke oc cee aCe aCe en oe cc ie ccc a ee L cc T a T t o etat a a e E T a a E A A E EAA AA E N E E A TA E A OARE E A Hc Ea Error Code Suspect Module Suspect Board Hybrid or IC FRU s 1411 ATTN1 Main 1421 AMP Main 1431 AMP Main 1441 AMP Main 1451 AMP Main 1461 AMP Main 1471 AMP Main 1481 AMP Main 1491 AMP Main 1511 PROBE 1521 PROBE 1531 Main 1541 Main 1551 Main 1611 ATTN2 Main 1621 AMP Main 1631 AMP Main 1641 AMP Main 1651 AMP Main 1661 AMP Main 1671 AMP Main 1681 AMP Main 1691 AMP Main 1711 Probe 1721 Probe 1731 Main 1741 Main 1751 Main Maintenance Other Messages Other messages can be displayed by the mainframe These are described below Calibrating a New Configuration When a plug in unit is first installed in a mainframe or when it is moved to a different compartment the mainframe enters the new configuration mode After power on diagnostics it will recalibrate itself for the new configuration During calibration the screen displays the message Powerup new configuration partial calibration occurring f calibration is successful the screen displays a completion message and the mainframe
107. uator channel 1 J310 ATTN2 Attenuator channel 2 J380 EPROM Firmware U1080 FPB Front Panel board A2 A3 identical units FRPAN Front Panel FUSE 15 V power Amp fuses F500 F610 3 4 Amp HTSNK Heat Sink Assembly 2s 2 12 9 caution Table 3 6 FRUS Cont Abbreviation Name Designator JMPERS Jumpers NPNTRAN Darlington NPN Power Transistors 1600 0690 NVRAM Memory U1000 PCON Probe Connector assembly J1001 J1002 PNPTRAN Darlington PNP Power Transistors Q601 Q691 PROBE A6302 or A6303 Current Probe RELAY Attenuator board relays K2 K4 SDI Tek M382A Serial Data Interface U850 SMPLHD1 Sample and Hold board CH 1 J640 SMPLHD2 Sample and Hold board CH 2 J650 Ordering Parts If you find that it is necessary to replace a FRU or a FRU IC it can be ordered from a Tektronix service center When ordering replacement parts include the following information a plug in type m plug in serial number Description of the part if electrical include the circuit number w Tektronix part number If a part you order has been replaced with a different or improved part your local Tektronix service ce
108. um flatness on the displayed signal Step 28 Set the Calibration Generator Period to 0 1 ms GOA SES Step 29 Set Main Size to 10 us div and adjust R34 for optimum transient response Step 30 Set Main Size to 1 us div and adjust R36 for optimum transient response The adjustments R34 R36 and R38 interact and may require readjustment for optimum transient response with the proper gain C Step 31 Repeat Steps 25 through 30 to optimize the transient response Procedure to Verify Probe Gain To verify the adjustments you will run automated probe calibration by following Procedure 13 in the Checks and Adjustments section Step 32 Calibrate channel R1 the channel to which the current probe is connected by running Steps 1 through 8 of Procedure 13 Probe Calibration C Step 33 Examine that the probe calibration portion passes Note that the deskew portion will probably not pass due to the long signal delay time through the 6303 probe probe gain calibration passes the probe gain is satisfactory If probe gain calibration failed perform the following steps Checks and Adjustments 11 16 Service Reference L LJ L Step 34 Examine the probe gain value with Diagnostics by selecting Extended Diagnostic from the Utility major menu Step 35 Select the Right Subsystem the 11A16 Block the CH1 CAL B Area and the Probe Gain Routine Step 36 Select Run and record the value shown in the ACTUAL column The ACTU
109. ure verifies that the aberrations are not excessive and that the bandwidth with the Voltage Adapter a standard accessory is adequate The procedure has two parts Examine Amplifier Step Response and Check Amplifier Bandwidth To obtain lower deflection factors attenuators are used to reduce the amplitude of the 11A16 input signal Specification Step Response The system mainframe 11A16 aberrations should not exceed 596 peak and 896 peak to peak Specification Bandwidth peak peak measurement at 120 MHz 27896 of the amplitude at 50 kHz Setup to Examine Amplifier Step Response Mainframe Voltage Adapter Calibration Generator 2 5X 5X 10X Attenuators Tm not connected yet Coaxial Cable Steps Necessary to Examine Amplifier Step Response Step 1 First Initialize the mainframe settings then perform the following settings in the order listed Calibration generator FONCION SWIM CENE er Ee Dara High Ampl mcis ecc PDT IT 1 ys Pulse AImplilllle sce etd eee 500 mV p p Center Plug in CH T Display on Mainframe MOI vera ehe T oak 100 mV div Main Se cov Ladadaia S D E E ma io A ego 500 ns div REV FEB 1991 2 13 Procedure 3 High Frequency Response Main position positive going edge to first graticule li
110. uter receptacle to ensure that the center conductor enters its receptacle properly Removing Replacing the Connector Assembly See Figures 3 2 3 4 3 5 3 7 3 10 and 3 12 for connector wiring and the locations of screws and index marks You can verify a faulty connector by trying a known good probe Remove the connector assembly as follows Step 1 Remove the Front Panel See Removing Replacing the Front Panel Step 2 Disconnect the coaxial connector at the Main board and at the Attenuator board Disconnect the 10 pin connector from the Main board 3 Disconnect the multi pin connectors that connect the Front Panel boards to the Main board Note the position of the multi pins index triangle to ensure that you can correctly replace this connector Step 4 Remove the four Torx head screws see Fig 3 7 that secure the current probe connector assembly to the front subpanel Step5 Slip the nut plate out of the way to gain access to the faulty probe connector Step 6 Remove the current probe connector assembly from the 11A16 Replace the current probe connector assembly by referring to Figures 3 4 and 3 5 then proceeding as follows Step 1 Align the 12 pin connector with the tang slot at the bottom as shown in Figure 3 4 Step 2 Insert the 12 pin connector through the Front Panel from the rear Put the nut plate on behind the connectors 11A16 Service Reference REV FEB 1991 3 17

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