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Tektronix 5A48 User's Manual

1. AMPLIFIER INSTRUCTION MANUAL 5A48 DISPLAY POSITION dut i CH 2 VOLTS DIV Al 1 9 r WITH Ws 8 3 GMN IMG 24 pF STEP ATIEN BAL POSITION CH i INVER 5 48 DUAL TRACE AMPL SECTION 1 SECTION 2 SECTION 3 OPERATING INSTRUCTIONS Instrument Description Preparation For Use Basic Operation General Operating Information Applying Signals Input Coupling Pre Charging Specifications Supplemental Information THEORY OF OPERATION Introduction Input Coupling Attenuators Channel 1 Amplifier Channel 2 Amplifier Channel Switch Trigger Amplifier Readout SERVICE INFORMATION Services Available Maintenance Circuit Board Removal Symbols and Reference Designators Electrical Parts List Internal Adjustment Procedure Parts Location Grid Front Panel Controls amp Connectors Illustration Block Diagram Inputs and Attenuators Schematic Channel 1 Amplifier Schematic Channel 2 Amplifier Schematic Trigger and Channel Switching Schematic Readout Schematic Mechanical Parts List Exploded View 5A48 TABLE OF CONTENTS Page 1 1 1 1 1 2 1 2 1 2 1 2 1 3 1 4 2 1 2 1 2 1 2 1 2 2 2 2 2 2 2 2 3 1 3 1 3 2 3 3 Section 1 5A48 OPERATING INSTRUCTIONS INSTRUMENT DESCRIPTION The 5A48 Dual Trace Amplifier is a general purpose medium bandwidth plug in unit for use with Tektronix 5400 series osc
2. HEAT SINK ELEC TEMPERATURE STABILIZING HEAT SINK ELEC 0 28 X 0 18 OVAL X 0 187 H RES VAR SEE R145 R345 EPL ATTACHING PARTS FOR EACH NUT PLAIN HEX 0 25 32 X 0 312 INCH BRS WASHER FLAT 0 25 ID X 0 375 INCH OD STL BRKT VAR RES _ XK lpor repair information SEE SERVICE SECTION OF 5403 MANUAL Mfr Code 80009 80009 42838 42838 00779 80009 83385 83385 80009 80009 42838 42838 00779 80009 83385 80009 80009 97464 80009 80009 80009 80009 73743 83385 80009 80009 42838 71785 22526 05820 80009 73743 79807 Mfr Part Number 131 1030 00 131 1031 00 RA 29952715 RA 29952715 1 332095 2 361 0382 00 OBD OBD 131 1030 00 131 1031 00 RA 29952715 RA 29952715 1 332095 2 361 0382 00 OBD 263 1000 00 401 0115 00 3100 43 CD 214 1139 03 214 1127 00 131 0963 00 401 0081 00 2X12161 402 OBD 131 1030 00 131 1031 00 RA 29952715 133 96 12 062 75060 256 D 214 0973 00 2X20319 402 OBD 03 23 Mechanical Parts List 5A48 FIGURE 1 EXPLODED CONT Fig amp Index Tektronix Serial Model No i Mfr No Part No Eff Dscont 1284 Name amp Description Code Mfr Part Number 1 87 214 0579 00 4 TERM TEST PT 0 40 INCH LONG 80009 214 0579 00 88 337 1656 00 l SHLD ELECTRICAL CH1 CH2 89 348 0031 00 l GROMMET PLASTIC 0 156 INCH DIA 80009 348 0031 00 90 376 0051 01 2 CPLG SHAFT FLEX FOR 0 125 INCH 80009 376 0051
3. Top Groove Bottom Groove y PY Fig 1 1 5A48 Installation Removal Procedure GI 1 1 Operating Instructions 5A48 fold out page for a description of the front panel Notice the color patterns printed on the front panel Blue indicates mode switching functions green refers to triggering yellow is precautionary and grey shows functional associations When the VOLTS DIV switches are in the 1 mV or 2 mV positions the bandwidth reduction to 25 mHz is vis ible as a reminder on a yellow background through the knob skirts BASIC OPERATION Push both the DISPLAY ON button and the CH 1 MODE button in the blue area Set the time base to 2 m and the sweep trigger to automatic Notice the illuminated skirt on the CH 1 VOLTS DIV switch showing vertical sensitivity Set the display module intensity control to midrange Turn the 5848 POSITION control until a trace appears on the CRT Push the CH 1 and CH 2 MODE buttons The CH 2 switch is now illuminated showing its sensitivity Both CH 1 and CH 2 buttons should now be in Turn the lower POSITION knob until two traces are visible on the CRT Set both VOLTS DIV switches to 2 Push the CH 1 TRIGGER button located in the green area Make certain that the AC and GND buttons for both channels in the grey area are out Apply the calibrator signal to the input connectors on both channels Adjust the triggering on the time base for two stable square wave displays each
4. As both channels are nearly identical only channel 1 will be discussed in detail Input Coupling Signals applied to the front panel BNC connectors pass to the attenuators through the precharge circuitry This allows charging or discharging AC coupling capacitor C101 to prevent damage to delicate circuitry under test The outer ring on the BNC connector is connected to the base of Q105 which operates the WITH 10X PROBE light behind the CH 1 VOLTS DIV switch skirt The ring also connects to Q610 which operates the readout circuitry Another front panel light controlled by 0110 illuminates unless a 10X coding probe is connected These lights operate only when connected to 200 V through S480A the CH 1 MODE switch Section 2 5A48 THEORY OF OPERATION Attenuators The attenuators are AC compensated thick film hybrids on ceramic substrates C114 sets the proper input capaci tance and C116 provides the proper series compensation for the 100X chip C124 and C126 provide identical fun ctions for the 10X attenuator chip C134 compensates the input to 24 pF in the 1X position The combination of these attenuators switched according to the charts shown on the schematics attenuate the signals to the 5A48 amplifiers Channel 1 Amplifier The attenuated signal is fed to FET 0140 paired with 01408 R145 through Q140B sets DC balance for the amplifier The signal is taken from the source of Q140A past protective diode CR140 t
5. GRIDJC GRIDICKT GRID J LOC NO LOC H3 8610 C2 CR630 C3 190 G2 K390 G5 L494 AS L496 B5 L497 B5 pl 299 Z ADD CKT GRID NO LOC 0105 LI Q110 LI ID CKT GRID CKT GRID CKT GRID NO Loc NO LOC NO LOC G6 0460 8588886888 992399800502 8 38 52555599998 F5 D3 03 B2 A4 CKT GRID NO LOC R102 L1 L1 L2 L2 Q2 R143 R147 R148 R150 R151 CKT GRID NO Loc H3 R142 8858855288 CKT NO GRID LOC NO LOC 12 R73 Hi 12 R176 12 R178 HI 2 R19 n 12 R181 2 G2 R182 G3 R183 11 H2 R185 H1 Hi R1897 GI G2 8188 GI 8 22 3RID CKT F2 E2 8 888582 GRID LOC 2g OOOO EEEEE E 835 5552508 880385 22525525252515 5589995 08258899818998 R EE BEE EREBE BER EEBERE ERE BERE HERE REREREBARE a 6 2 8 2 2 0 98 96 8882582288888 8585888885 mz 98885882288 5A48 amo eno CONTROLS AND CONNECTORS o S CH I 100 x10 XIOO AND QI70 VARIABLE QI85 8187 l 1 1 TRIGGER x M TAKE OFF Push in to operate plug in i Q260 5 CH 1 VOLTS DIV l l iti for ze input sensitivity 0 ESS J CHANNEL Q270 Q272 6275 Q280 1 1 XD 7A I 1 1 78 1 1 1 1 NT READOUT 24 Galo THRU TU 288 ADD TRIGGER TRIGGER 1 Adds input signals applied to both channels SWITCH AMPLIFIER 270 44 CH 1 CH 2
6. In the Parts List an Item Name is separated from the description by a colon Because of space limitations an Item Name may sometimes appear as incomplete For further Item Name identification the U S Federal Cataloging Handbook H6 1 can be utilized where possible ABBREVIATIONS ACTR ACTUATOR PLSTC PLASTIC ASSY ASSEMBLY QTZ QUARTZ CAP CAPACITOR RECP RECEPTACLE CER CERAMIC RES RESISTOR CKT CIRCUIT RF RADIO FREQUENCY COMP COMPOSITION SEL SELECTED CONN CONNECTOR SEMICOND SEMICONDUCTOR ELCTLT ELECTROLYTIC SENS SENSITIVE ELEC ELECTRICAL VAR VARIABLE INCAND INCANDESCENT WW WIREWOUND LED LIGHT EMITTING DIODE XFMR TRANSFORMER NONWIR NON WIREWOUND XTAL CRYSTAL REV C AUG 1974 3 3 Electrical Parts List 5A48 MFR CODE MANUFACTURER 01121 Allen Bradley Co 03508 General Electric Co Semi Conductor Products Dept 07263 Fairchild Semiconductor A Div of Fairchild Camera and Instrument Corp 07910 Teledyne Semiconductor 08806 General Electric Co Miniature Lamp Products Dept 13715 Fairchild Semiconductor A Div of Fairchild Camera and Instrument Corp 17856 Siliconix Inc 24931 Specialty Connector Co Inc 34553 Amperex Electronic Corp Component Div 50157 N L Industries Inc Electronics Dept 56289 Spraque Electric Co 71590 Centralab Electronics Div of Globe Union Inc 72982 Erie Technological Products Inc 73138 Beckman Instruments Inc Helipot Div 74970 Johnson E F Co 75042 TRW Electron
7. 00 Q395 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q4102 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q415 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 9420 151 0341 00 TRANSISTOR SILICON NPN 07263 5 9430 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q435 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 94603 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q4653 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q480 151 0341 00 TRANSISTOR SILICON NPN 07263 2N3565 Q485 151 0341 00 TRANSISTOR SILICON NPN 07263 2113565 Q610 151 0254 00 TRANSISTOR SILICON NPN 03508 2N5308 Q630 151 0254 00 TRANSISTOR SILICON NPN 03508 8 R101 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 CB1051 R102 321 0222 00 RES FXD FILM 2K OHM 1 0 125W 75042 CEATO 2001F R103 316 0104 00 RES FXD COMP 100K OHM 10 0 25W 01121 CB1041 R105 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 CB1051 R107 315 0134 00 RES FXD COMP 130K OHM 5 0 25W 01121 CB1345 R109 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 71 R112 315 0560 00 RES FXD COMP 56 OHM 5 0 25W 01121 5 R132 322 0481 01 RES FXD FILM 1M OHM 0 5 0 25W 75042 CEBTO 1004D R134 317 0100 00 RES FXD COMP 0 OHM 5 0 125W 01121 BB1005 R136 315 0474 00 RES FXD COMP 470K OHM 5 0 25W 01121 CB4745 R138 316 0102 00 RES FXD COMP 1K OHM 1
8. 00 RES FXD COMP 3K OHM 5 0 25W 01121 5 R357 315 0621 00 RES FXD COMP 620 OHM 5 0 25W 01121 5 R358 321 0078 00 RES FXD FILM 63 4 OHM 1 0 125W 75042 CEATO 63R40F R359 321 0114 03 RES FXD FILM 150 OHM 0 25 0 125W 91637 MFF1816D150ROC R361 321 0085 03 RES FXD FILM 75 OHM 1 0 125W 91637 MFF186D75RO0C R363 321 0085 03 RES FXD FILM 75 OHM 1 0 125W 91637 MFF186D75RO0C R364 321 0033 00 RES FXD FILM 21 5 OHM 1 0 125W 75042 CEATO 21R50F R366 315 0560 00 RES FXD COMP 56 OHM 5 0 25W 01121 CB5605 R3681 311 1364 00 RES VAR NONWIR 1K OHM 10 0 50W 01121 10M321A R369 321 0068 00 RES FXD FILM 49 9 OHM 1 0 125W 75042 CEATO 49R90F R370 315 0431 00 RES FXD COMP 430 OHM 5 0 25W 01121 CB4315 R372 321 0170 00 RES FXD FILM 576 OHM 1 0 125W 75042 CEATO 5760F R373 316 0101 00 RES FXD COMP 100 OHM 10 0 25W 01121 CB1011 R376 315 0512 00 RES FXD COMP 5 1K OHM 5 0 25W 01121 CB5125 R378 315 0331 00 RES FXD COMP 0 OHM 5 0 25W 01121 CB3315 R379 321 0067 00 RES FXD FILM 48 7 OHM 1 0 125W 75042 CEATO 48R70F R381 323 0245 00 RES FXD FILM 3 48K OHM 1 0 50W 75042 CECTO 3481F R382 311 1565 00 RES VAR NONWIR 250 OHM 20 0 50W 73138 91A250R0M R383 323 0245 00 RES FXD FILM 3 48K OHM 1 0 50W 75042 CECTO 3481F R385 315 0431 00 RES FXD COMP 430 OHM 5 0 25W 01121 5 R387 321 0170 00 RES FXD FILM 576 OHM 1 0 125W 75042 CEATO 5760F R389 321 0135 00 RES FXD FILM 249 OHM 1 0 125W 75042 CEATO 2490F R390 315 0271 00 RES FX
9. 01 213 0022 00 4 SETSCREW 4 40 X 0 188 INCH HEX SOC STL 74445 OBD 354 0251 00 2 RING COUPLING 0 251 ID X 0 375 INCH OD AL 80009 354 0251 00 376 0049 00 l CPLG SHAFT FLEX PLASTIC 80009 376 0049 00 91 2 RES VAR SEE R168 R368 EPL 361 0515 00 3 2 SPACER SWITCH PLASTIC 80009 361 0515 00 92 260 1209 00 l SWITCH PUSH 4PDT 71590 2KABO01000 358 93 260 1363 00 l SWITCH PUSH DISPLAY ON 94 260 1364 00 l SWITCH PUSH MODE 95 260 1365 00 l SWITCH PUSH TRIG SOURCE 96 361 0382 00 4 SPACER PB SW BROWN 0 275 INCH LONG 80009 361 0382 00 97 361 0384 00 9 SPACER PB SW 0 133 INCH LONG 80009 361 0384 00 ATTACHING PARTS FOR CKT BD 98 213 0146 00 4 SCR TPG THD FOR 6 20 X 0 313 INCH PNH STL 83385 OBD 210 0801 01 4 WASHER FLAT 0 140 ID X 0 281 OD STL 12327 NOTE m W 131 1372 00 2 CONTACT ELEC 80009 131 1372 00 100 426 0724 02 1 FR SECT PLUG IN BOTTOM 80009 426 0724 02 101 426 0725 02 1 FR SECT PLUG IN TOP 80009 426 0725 02 102 175 0825 00 FT WIRE ELECTRICAL 2 WIRE RIBBON 2 9 FT LONG 23499 TEK 175 0825 00 103 175 0830 00 FT WIRE ELECTRICAL 7 WIRE RIBBON 1 6 FT LONG 08261 TEK 175 0830 00 03 24 03 5
10. R610 321 0299 00 R612 315 0753 00 R614 315 0154 00 R616 321 0344 00 R618 315 0753 00 R620 315 0154 00 R622 315 0154 00 R623 315 0513 00 R625 321 0344 00 R627 315 0753 00 R630 321 0299 00 R632 315 0753 00 R634 315 0154 00 R636 321 0344 00 R638 315 0753 00 R640 315 0154 00 R642 315 0154 00 R643 315 0513 00 R645 321 0344 00 R647 315 0753 00 R650 315 0154 00 R652 315 0154 00 R653 315 0154 00 R656 315 0123 00 R658 315 0753 00 R660 315 0753 00 R662 315 0154 00 R670 315 0123 00 RT178 307 0125 00 RT378 307 0125 00 REV C AUG 1974 B010100 BO10299 B010300 B010100 9 B010300 RES FXD FILM 3 57K OHM 1 0 125W RES FXD COMP 2K OHM 5 0 25W RES FXD COMP 1 6K OHM 5 0 25W RES VAR NONWIR 10K OHM 20 0 75W RES RES RES RES RES RES RES RES RES RES RES EXD COMP FXD COMP FXD COMP 220 OHM 5 0 25W EXD COMP EXD FILM FXD FILM FXD FILM FXD COMP FXD COMP 100 OHM 10 0 25W EXD COMP e EXD COMP 6 8K OHM 5 0 25W FXD COMP EXD COMP 62K OHM 5 0 25W rEXD COMP FXD COMP EXD COMP FXD COMP e FXD COMP FXD FILM e FXD COMP FXD COMP FXD FILM EXD COMP e EXD COMP e EXD COMP EXD COMP FXD FILM 75K OHM 5 0 25W FXD COMP FXD FILM 75K OHM 5 0 25W EXD COMP FXD COMP FXD FILM FXD COMP FXD COMP FXD COMP FXD COMP FXD FILM 75K OHM 5 0 25W 150K OHM 5 0 25W 150K OH
11. TRIGGER gt a Q285 Q240 quM we 2232 e STEP ATTN BAL Adjusts CH 2 DC Atten uator balance S325 gt EZ TRIGGER TAKE OFF C460 Q465 e Connects CH 2 input to ground through 1M9 resistor CAL Varies CH 2 attenuation U I I 1 l 1 1 between steps l 1 1 1 CH 2 INPUT N POSITION ertically positions CH 2 J 00 INPUT RANGE CASCODE AMPLIFIER DIFFERENTIAL RELEASE LATCH trave en CRY INPUT FOLLOWER ATTENUATOR AND X5 GAIN AMPLIFIER ER COUPLING 6840A 3408 AND a370 2 Les asd 2 198 PARENT 300 VARIABLE Q38S 387 v S HET CH 2 VOLTS DIV Selects input sensitivity for CH 2 3 14 Brock Diagram 6 73 ii geo a z gt z a 2 NES ie SSA S i R SAT 9 8 9 2 18181811 15116161519 i Ro 54 A z 5 and 4 6 0 LI 1 TTelsiseeleeei x TO 5480p 300 __ 8 gt e I i lt 03 15 CJH 0273 INPUT ATTENUATORS C 5A48 125 5 N IMV POSITION 7 50 e 9 5 w Li i5V w SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS MARKED WITH BLUE OUTLINE SA48 ER z 7 i 4 la JO l ie TOM 1 CHANNEL 1 AMPLIFIER 1273 03 16 03 17 CHANNEL 2 MP
12. approximately two divisions in amplitude Push the ADD button and observe a square wave four divisions in amplitude Now push the CH 2 INVERT button and observe a single trace When the 5A48 is in the ADD MODE either POSITION control positions the trace however when using this mode center one position control and use the other to position the trace Release the CH 2 INVERT button and push the CH 1 MODE button Push the channel 1 GND button and position the single trace to the graticule center Release the GND button and push the AC button directly above it Notice that the square wave centers around the graticule center and shows a slight slope This indicates that the signal is capacitively coupled to the input The slope indicates low frequency rolloff due to the AC coupling Channel 2 input characteristics are identical If any of the above displays cannot be obtained refer to the Service Section of this manual GENERAL OPERATING INFORMATION Applying Signals When making measurements of unknown voltages use the highest deflection factor first If the deflection is too small switch to a lower deflection factor In general probes offer the most convenient method of applying signals to the 5A48 Tektronix probes are shielded to prevent pickup of electrostatic interference A 10X probe offers a relatively high input impedance and minimum loading to the circuit under test The 5A48 is compatible with readout coded probes such as the P6
13. 0 0 25W 01121 CB1O21 R140 315 0621 00 RES FXD COMP 0 OHM 53 0 25W 01121 8625 R142 322 0268 00 RES FXD FILM 6 04K OHM 1 0 25W 75042 CEBTO 6041F R143 322 0268 00 RES FXD FILM 6 04K OHM 1 0 25W 75042 CEBTO 6041F R145 311 0546 00 RES VAR NONWIR 10K OHM 20 0 75W 97979 TK0546G R147 321 0353 00 RES FXD FILM 46 4K OHM 1 0 125W 75042 CEATO 4642F R148 321 0138 00 RES FXD FILM 267 OHM 1 0 125W 75042 CEATO 2670F R150 315 0621 00 RES FXD COMP 0 OHM 5 0 25W 01121 CB6215 R151 315 0471 00 RES FXD COMP 470 OHM 5 0 25W 01121 75 R152 311 1564 00 RES VAR NONWIR 500 OHM 20 0 50W 73138 91A 500ROM R153 315 0302 00 RES FXD COMP 3K OHM 5 0 25W 01121 5 R155 315 0302 00 RES FXD COMP 3K OHM 5 0 25W 01121 CB3025 R157 315 0621 00 RES FXD COMP 0 OHM 5 0 25W 01121 CB6215 R158 321 0078 00 RES FXD FILM 63 4 OHM 1 0 125W 75042 CEATO 63R40F R159 321 0114 03 RES FXD FILM 150 OHM 0 255 0 2 91637 0 0 R161 321 0085 03 RES FXD FILM 75 OHM 1 0 125W 91637 MFF186D75RO0C R163 321 0085 03 RES FXD FILM 75 OHM 1 0 125W 91637 60 R164 321 0033 00 RES FXD FILM 21 5 OHM 1 0 125W 75042 CEATO 21R50F R166 315 0560 00 RES FXD COMP 6 OHM 55 0 01121 CB5605 R1684 311 1364 00 RES VAR NONWIR lK OHM 10 0 50W 01121 10M321A R169 321 0068 00 RES FXD FILM 49 9 OHM 1 0 125W 75042 CEATO 49R90F R170 315 0431 00 RES FXD COMP 430 OHM 5 0 25W 01121 CB4315 R172 321 0170 00 RES FXD FILM 576 OHM 1 0 125W 75
14. 0 252010100 9 CAP FXD CER DI 100PF 20PF 350V 72982 301 0004 C364 281 0549 00 8030930 CAP FXD CER DI 68PF 10 500V C370 281 0630 00 CAP FXD CER DI 390PF 5 500V 72982 301 000Y5D0391J C376 281 0592 00 CAP FXD CER DI 4 7PF 0 5PF 500V 72982 301 023COHO479D C378 281 0564 00 CAP FXD CER DI 24PF 5 500V 72982 301 0000607 C383 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C385 281 0630 00 CAP FXD CER DI 390PF 5 500V 72982 301 000Y5D0391J C389 281 0547 00 BO10100 B010299 CAP FXD CER DI 2 7PF 10 500V 72982 301 06 C389 281 0547 00 BO10300 CAP FXD CER DI 2 7PF 10 500V 72982 301 000C0J0279C C390 281 0623 00 CAP FXD CER DI 650 5 500V 72982 301 6517 C397 283 0094 00 CAP FXD CER DI 27PF 10 200V C399 281 0153 00 BO10100 B010299 CAP VAR AIR DI 1 7 10PF 250V 74970 187 0106 005 C399 281 0166 00 BO10300 CAP VAR AIR DI 1 9 15 7PF 250V 74970 187 0109 005 C410 281 0623 00 CAP FXD CER DI 650PF 5 500V 72982 301 06517 C425 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 3831 516E102P C463 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C480 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 83l 516E102P C485 283 0150 00 CAP FXD CER DI 650PF 5 200V 72982 835 515B651J C490 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 37 C493 283 0002 00 CAP FXD CER DI 0 01LUF 80 20 7 72982 8 11 56752 C494 290 0527 00 CAP FXD ELCTLT 15UF 20 20V 90201 TDC156M020FL C495 290 0527 00 C
15. 00 384 1100 00 384 1129 00 384 1138 00 OBD 03 22 Mechanical Parts List 5A48 Fig amp Index 1 43 44 50 51 52 53 54 56 57 58 59 60 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 85 86 Tektronix Serial Model No No Part No Eff 131 1030 0011 131 1031 001 210 0779 00 131 1338 00 210 0779 00 136 0252 01 337 1737 00 260 1353 01 361 0382 00 407 1435 00 211 0116 00 337 1664 00 213 0088 00 131 1030 00 131 1031 00 210 0779 00 131 1338 00 210 0779 00 136 0252 01 337 1737 00 260 1353 01 361 0382 00 407 1096 00 211 0116 00 263 1000 00 401 0115 00 354 0391 00 105 0341 00 214 1139 03 214 1127 00 1 31 0 9630 401 0081 00 210 0406 00 211 0116 00 131 1030 00 131 1031 00 210 0779 00 136 0235 00 136 0252 04 136 0337 00 214 1916 00 214 0973 00 210 0583 00 210 0940 00 387 0794 00 BO10100 B030999 BO31000 Dscont Qty 1 4 4 4 2 mer N w DE BB RR w H DH EH N w H IN pP JJ H 00 10 18 18 16 O 1 H H FIGURE 1 EXPLODED CONT 123 4 5 Name amp Description CKT BOARD ASSY ATTEN CH 1 SEE A3 EPL CONTACT ASSY EL CAM SWITCH BOTTOM CONTACT ASSY EL CAM SWITCH TOP RIVET TUBULAR 0 051 OD X 0 115 INCH LONG CONTACT ELEC GROUNDING ATTACHING PARTS RIVET TUBULAR 0 051 OD X 0 115 I
16. 042 CEATO 5760F R173 316 0101 00 RES FXD COMP 100 OHM 10 0 25W 01121 cB1011 R176 315 0512 00 RES FXD COMP 5 1K OHM 5 0 25W 01121 CB5125 R178 315 0331 00 RES FXD COMP 330 OHM 5 0 25W 01121 CB3315 R179 321 0067 00 RES FXD FILM 48 7 OHM 1 0 125W 75042 CEATO 48R70F 10370 and Q385 furnished as a matched pair 20390 and Q410 furnished as a matched pair 30460 and 0465 furnished as a matched pair rurnished as a unit with S168 3 8 REV C AUG 1974 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number R181 323 0245 00 RES FXD FILM 3 48K OHM 1 0 50W 75042 CECTO 3481F R182 311 1565 00 RES VAR NONWIR 250 OHM 20 0 50W 73138 91A250ROM R183 323 0245 00 RES FXD FILM 3 48K OHM 1 0 50W 75042 CECTO 3481F R185 315 0431 00 RES FXD COMP 430 OHM 5 0 25W 01121 CB4315 R187 321 0170 00 RES FXD FILM 576 OHM 1 0 125W 75042 CEATO 5760F R189 321 0135 00 RES FXD FILM 249 OHM 1 0 125W 75042 CEATO 2490F R190 315 0271 00 RES FXD COMP 270 OHM 5 0 25W 01121 CB2715 R195 322 0193 00 RES FXD FILM 1K OHM 1 0 25W 75042 CEBTO 1001F R197 315 0332 00 RES FXD COMP 3 3K OHM 5 0 25W 01121 CB3325 R199 315 0390 00 RES FXD COMP 39 OHM 5 0 25W 01121 CB3905 R200 323 0189 00 RES FXD FILM 909 OHM 1 0 50W 75042 CECTO 9090F R201 321 0065 00 RES FXD FILM 46 4 OHM 1 0 125W 75042 CEATO 46R40F R202 321 0065 00 RES FXD FILM 46 4 OHM 1 0 125W 75042 CEATO 46R40F R2
17. 05 311 1566 00 RES VAR NONWIR 200 OHM 20 0 50W 73138 91A 200ROM R206 321 0126 00 BOlOlOO 8030969 RES FXD FILM 200 OHM 1 0 125W 75042 CEATO 2000F R206 321 0121 00 BO30970 RES FXD FILM 178 OHM 1 0 125W R210 315 0271 00 RES FXD COMP 270 OHM 5 0 25W 01121 5 R215 322 0193 00 RES FXD FILM 1K OHM 1 0 25W 75042 CEBTO 1001F R217 315 0201 00 RES FXD COMP 200 OHM 5 0 25W 01121 CB2015 R220 321 0246 00 RES FXD FILM 3 57K OHM 1 0 125W 75042 CEATO 3571F R222 315 0202 00 BOlOlOO 6 9 RES FXD COMP 2K OHM 5 0 25W 01121 5 R222 315 0162 00 B010300 RES FXD COMP 1 6K OHM 5 0 25W 01121 081625 R225 311 0546 00 RES VAR NONWIR 10K OHM 20 0 75W 97979 TK0546G R227 315 0202 00 858010100 8010299 RES FXD COMP 2K OHM 5 0 25W 01121 CB2025 R227 315 0162 00 0 RES FXD COMP 1 6K OHM 5 0 25W 01121 5 R230 321 0118 00 RES FXD FILM 165 OHM 13 0 125W 75042 CEATO 1650F R232 315 0201 00 RES FXD COMP 200 OHM 5 0 25W 01121 2205 R235 321 0118 00 RES FXD FILM 165 OHM 1 0 125W 75042 CEATO 1650F R240 316 0100 00 RES FXD COMP 10 OHM 10 0 25W 01121 171 R242 321 0060 00 BOl0100 37 RES FXD FILM 41 2 OHM 1 0 125W 75042 CEATO 41R20F R242 321 0064 00 BOl0338 BO19999 RES FXD FILM 45 3 OHM 1 0 125W 75042 CEATO 45R30F R242 321 0060 00 BO20000 RES FXD FILM 41 2 OHM 1 0 125W 75042 CEATO 41R20F R243 315 0182 00 RES FXD COMP 1 8K OHM 5 0 25W 01121 CB1825 R245 315 0182 00 RES FXD COMP 1 8K OHM 5 0 25W 01121 5 R247 321 0060 00 8010100 8010337 RES
18. 065 passive probe Your Tektronix catalog lists other probes compatable with the 5A48 The input connector has an outer ring to which the coding ring on the probe connector makes contact This allows the deflection factor indicated on the knob skirt and the CRT readout to correspond with the actual deflection factor at the probe tip Notice the notation WITH PROBE on the front panel 1 2 Sometimes unshielded test leads can be used to connect the 5A48 to a signal source This method works best when measuring high level signals with relatively low source impedances Coaxial cable with BNC connectors works well in certain applications When using unterminated coaxial cable use the shortest possible lengths to prevent un necessary capacitive loading of the signal source A com mon ground between the signal source and 5A48 is required The probe ground connection or the shield of a coaxial cable works well as a ground return Input Coupling DC coupling button out can be used in most applica tions If the DC component of the measured signal is large compared to the AC component AC coupling button in should be used Use DC coupling for AC signals below about 10 hertz to avoid signal attenuation in the AC position The GND pushbutton provides a ground reference at the 5A48 input When the pushbutton is in the amplifier input is grounded and the signal is connected to ground through a 1 MQ resistor Obtain a ground reference
19. 1 0220 00 TRANSISTOR SILICON PNP 80009 151 0220 00 Q272 151 0341 00 TRANSISTOR SILICON NPN 07263 2N3565 Q275 151 0220 00 TRANSISTOR SILICON PNP 80009 151 0220 00 Q280 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q285 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q290 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q292 151 0221 00 010100 9 TRANSISTOR SILICON PNP 07263 S24849 0292 151 0220 00 00 TRANSISTOR SILICON PNP 80009 151 0220 00 Q305 151 0347 00 TRANSISTOR SILICON NPN 80009 151 0347 00 Q310 151 0347 00 TRANSISTOR SILICON NPN 80009 151 0347 00 Q340A B 151 1032 00 TRANSISTOR SILICON FET DUAL 17856 9 0350 151 0333 00 TRANSISTOR SILICON NPN SEL FROM MPS918 80009 151 0333 00 Q355 151 0333 00 TRANSISTOR SILICON NPN SEL FROM MPS918 80009 151 0333 00 15170 and Q185 furnished as a matched pair 20190 and Q210 furnished as a matched pair 3 REV C AUG 1974 Q260 and Q265 furnished as a matched pair Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number 93701 153 0603 00 SEMICOND DVC SE SILICON NPN MTCHD PAIR 80009 153 0603 00 Q372 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 03851 153 0603 00 SEMICOND DVC SE SILICON NPN MTCHD PAIR 80009 153 0603 00 Q387 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 Q3902 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610
20. 15 CB6825 000 5 0065 CB27G5 CB27G5 CB27G5 015 CEATO 1272P 075 CB1545 CEATO 3742F CB7535 CB1545 CB1545 CB5135 CEATO 3742F CB7535 CEATO 1272F CB7535 CB1545 CEATO 3742F 00 75 05 CB1545 0855 CEATO 3742F CB7535 CB1545 CB1545 CB1545 CB1235 CB7535 CB7535 CB1545 CB1235 2D1595 2D1595 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number S100B SWITCH PUSH CHl CHG GND 525 263 1000 00 ACTR ASSY CAM S CHl VOLTS DIV S1681 CAL S270A 260 1365 00 SWITCH PUSH CH1 TRIG ma SWITCH PUSH CH2 TRIG e 260 1353 01 SWITCH PUSH CH2 AC PRE S300B SWITCH PUSH CH2 CHG GND S325 263 1000 00 ACTR ASSY CAM S CH 2 VOLTS DIV S368 CAL S390 260 1209 00 SWITCH PUSH CH2 INVERT 71590 2KAB001000 358 S480A SWITCH PUSH CH1 MODE sos 260 1364 00 SWITCH PUSH CH2 MODE S480C SWITCH PUSH ADD MODE S495 260 1363 00 SWITCH PUSH DISPLAY ON leurnished aS a unit with R168 Furnished as a unit with R368 3 12 5A48 CKT C112 C114 C116 C124 C134 C136 MAIN BOARD NOTE S88SSSSRCS 4 4 fd COMPONENTS SHOWN WITH DASHED LINES ARE LOCATED ON BACK SIDE OF BOARD 55595555958 NO Loc 6225 EZ C230 E4 C242 D4 C247 C4 C263 G3 C270 D6 C280 C5 C301 R6 C302 L4 C312 as 8888888888 5555892932 8898 2955555555 88 S 28228288383 8 2829829228 8 Q 87 3 5 PARTS LOCATION GRID LA Q R185 FO 08 86
21. 386 1916 00 213 0229 00 337 1398 00 344 0195 01 384 1059 00 384 1100 00 384 1129 00 384 1138 00 337 1663 00 213 0088 00 REV B AUG 1974 Dscont B010100 B031398 BG31399 XB031399 XB031399 Z N NIN P p Mh fs N H Mechanical Parts List 5A48 FIGURE 1 EXPLODED 1 23 45 Name amp Description SHLD ELECTRICAL 8 KNOB GRAY WITH SETSCREW SETSCREW 5 40 X 0 125 INCH HEX SOC STL KNOB RED WITH SETSCREW SETSCREW 5 40 X 0 125 INCH HEX SOC STL KNOB CH1 amp CH2 VOLTS DIV SETSCREW 5 40 X 0 125 INCH HEX SOC STL KNOB LATCH ATTACHING PARTS PIN KNOB SECRG GRAY AC PRE GRAY CHG GND GRAY ON BUTTON GRAY INVERT BUTTON GRAY CHl DUAL BUTTON GRAY TRACE CH2 BUTTON GRAY ADD PUSH BUTTON GRAY CHl PUSH BUTTON CH2 FR PUSH BUTTON GRAY PLASTIC CONNECTOR RCPT BNC W HARDWARE CONNECTOR RCPT BNC W HARDWARE ATTACHING PARTS FOR EACH NUT PLAIN HEX WASHER LOCK INT 0 521 ID X 0 625 INCH OD STL cm BSHG MACH THD HEX 0 375 32 X 0 438 LONG ATTACHING PARTS FOR EACH NUT PLAIN HEX 0 375 X 0 438INCH STL WASHER FLAT 0 375 ID X 0 50 INCH OD STL DE RES VAR POSITION SEE R225 R425 EPL ATTACHING PARTS NUT PLAIN HEX 0 25 32 X 0 312 INCH BRS WASHER FLAT 0 25 ID X 0 375 INCH OD STL 8 JACK TIP GROUNDING ATTACHING PARTS NUT PLAIN HEX 0 25 32 X 0 312 INCH BRS WASHER L
22. 5 00 C100 283 0005 00 CAP FXD CER DI 0 01UF 100 0 250v 72982 8131 250651103P C101 285 0816 04 CAP FXD PLSTC 0 19UF 10 600V C102 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C112 281 0572 00 CAP FXD CER DI 6 8PF 0 5PF 500V 72982 301 000COHO689D C114 307 1014 01 80 8 ATTENUATOR FXD 100X 80009 307 1014 01 c C116 307 1014 02 BO33289 ATTENUATOR FXD 100X 80009 307 1014 02 307 1013 01 BO10100 B033288 ATTENUATOR FXD 10X 80009 307 1013 01 C126 C126 307 1013 00 B033289 ATTENUATOR FXD 10X 80009 307 1013 00 C134 281 0182 00 CAP VAR PLSTC 1 8 10PF 300V 34553 2222 809 05002 C136 281 0614 000 CAP FXD CER DI 6800PF 80 20 500V 72982 302 000007 C138 290 0534 00 CAP FXD ELCTLT 1UF 20 35V 56289 31 C140 290 0534 00 CAP FXD ELCTLT 1UF 20 35V 56289 196D105X0035HAl C142 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500v 72982 83l 516E102P C145 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 546F103Z C147 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 546E103z C150 281 0605 00 CAP FXD CER DI 200PF 10 500V 72982 301 000Y5D0201K C153 290 0534 00 CAP FXD ELCTLT 1UF 20 35V 56289 196D105X0035HA1 C157 281 0605 00 CAP FXD CER DI 200PF 10 500V 72982 301 000Y5D0201K Cl64 281 0523 00 CAP FXD CER DI 100PF 20PF 350V 72982 301 000U2MO101M C170 281 0630 00 CAP FXD CER DI 390PF 53 500V 72982 301 7 C176 281 0592 00 CAP FXD CER DI 4 7PF 0 5PF 500V 72982 301 023C0
23. 9 108 0245 00 Q105 151 0347 00 TRANSISTOR SILICON NPN 80009 151 0347 00 Q110 151 0347 00 TRANSISTOR SILICON NPN 80009 151 0347 00 Q140A B 151 1032 00 TRANSISTOR SILICON FET DUAL 17856 9 0150 151 0333 00 TRANSISTOR SILICON NPN SEL FROM MPS918 80009 151 0333 00 Q155 151 0333 00 TRANSISTOR SILICON NPN SEL FROM MPS918 80009 151 0333 00 Q1701 153 0603 00 SEMICOND DVC SE SILICON NPN MTCHD PAIR 80009 153 0603 00 0172 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 Q1851 153 0603 00 SEMICOND DVC SE SILICON NPN MTCHD PAIR 80009 153 0603 00 0187 151 0223 00 TRANSISTOR SILICON NPN 80009 151 0223 00 Q1902 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q195 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q2102 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q215 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q220 151 0341 00 TRANSISTOR SILICON NPN 07263 5 0230 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q235 151 0325 00 TRANSISTOR SILICON PNP SEL FROM 2N4258 80009 151 0325 00 Q240 151 0225 00 8010100 8010337 TRANSISTOR SILICON NPEN 07910 CS23365 Q240 151 0333 00 B010338 TRANSISTOR SILICON NPN SEL FROM MPS918 80009 151 0333 00 0250 151 0225 00 B010100 8010337 TRANSISTOR SILICON NPN 07910 CS23365 92603 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q2653 153 0610 00 SEMICOND DVC SE SILICON PNP MTCHD PAIR 80009 153 0610 00 Q270 15
24. ALUE SEL C263 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C270 283 0000 00 CAP PXD CER DI 0 001UF 100 0 500V 72982 831 516102 C280 281 0600 00 CAP FXD CER DI 35PF 10 500V 72982 308 000C0G0350K C300 283 0005 00 CAP FXD CER DI 0 01UF 100 0 250V 72982 8131 250651103P C301 285 0816 04 CAP PXD PLSTC 0 19UF 103 600V C302 283 0000 000 CAP FXD CER DI 0 001UF 100 0 500V 72982 83l 516E102P C312 281 0 572 00 CAP FXD CER DI 6 8PF 0 5PF 500V 72982 301 000COHO689D 1 307 1014 01 20110100 8 ATTENUATOR FXD 100X 80009 307 1014 01 C316 307 1014 02 B033289 ATTENUATOR FXD 100X 80009 307 1014 02 C316 REV E FEB 1975 3 5 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number 307 101 3 1 B010100 8 ATTENUATOR FXD 10X 80009 3007 1013 01 C326 307 1013 00 803 9 ATTENUATOR FXD 10X 80009 307 1013 00 C326 C334 281 0182 00 CAP VAR PLSTC 1 8 10PF 300V 34553 2222 809 05002 C336 281 0614 00 CAP FXD CER DI 6800PF 80 20 7 72982 302 000 7 C338 290 0534 00 CAP FXD ELCTLT 1UF 20 35V 56289 19601053003512 C342 283 0000 00 CAP FXD CER DI 0 001UF 100 0 7 72982 831 516E102P C345 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 5621022 C350 281 0605 00 CAP FXD CER DI 200 105 500V 72982 301 000Y5D0201K C357 281 0605 00 CAP FXD CER DI 200PF 10 500V 72982 301 000Y5D0201kKk C364 281 0523 0
25. AP FXD ELCTLT 15UF 20 20V 90201 TDCl156MO20FL C496 290 0527 00 CAP FXD ELCTLT 15UF 20 20V 90201 TDCl156MO20FL C497 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 546E103Z C498 290 0534 00 CAP FXD ELCTLT 1UF 20 35V 562898 51 C499 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 546E103Z C625 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 83l 516E102P C645 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 83l 516E102P C650 283 0000 00 CAP FXD CER DI 0 001UF 4100 0 500V 72982 831 516E102P C656 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 83l 516E102P C670 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P C680 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500V 72982 831 516E102P CR138 152 0324 00 BO10100 8029999 SEMICOND DEVICE SILICON 35V 100MA 03509 6 CR138 152 0367 00 00 SEMICOND DEVICE SILICON 20V 2022 07263 0 CR140 152 0153 00 SEMICOND DEVICE SILICON 15V 50MA 13713 3 CR190 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR210 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR338 152 0324 00 BO10100 9 SEMICOND DEVICE SILICON 35V 100MA 03508 SE416 CR338 152 0367 060 B030000 SEMICOND DEVICE SILICON 20V 20PA 07263 FSA1540 CR340 152 0153 00 SEMICOND DEVICE SILICON 15V 50MA 13715 FD7003 CR390 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 0716 2 CR395 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR410 152 0141 02 SEMICOND DEVICE
26. Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number R301 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 81051 R302 321 0222 00 RES FXD FILM 2K OHM 1 0 125W 75042 CEATO 2001F R303 316 0104 00 RES FXD COMP LOOK OHM 10 0 25W 01121 CB1041 R305 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 CB1051 R307 315 0134 00 RES FXD COMP 130K OHM 5 0 25W 01121 CB1345 R309 316 0105 00 RES FXD COMP 1M OHM 10 0 25W 01121 CB1051 R312 315 0620 00 RES FXD COMP 62 OHM 5 0 25W 01121 CB6205 R332 322 0481 01 RES FXD FILM 1M OHM 0 5 0 25W 75042 CEBTO 1004D R334 317 0100 00 RES FXD COMP 10 OHM 5 0 125W 01121 BB1005 R336 315 0474 00 RES FXD COMP 470K OHM 5 0 25W 01121 CB4745 R338 316 0102 00 RES FXD COMP 1K OHM 10 0 25W 01121 CB1021 R340 315 0621 00 RES FXD COMP 620 OHM 5 0 25W 01121 CB6215 R342 322 0268 00 RES FXD FILM 6 04K OHM 1 0 25W 75042 CEBTO 6041F R343 322 0268 00 RES FXD FILM 6 04K OHM 1 0 25W 75042 CEBTO 6041F R345 311 0546 00 RES VAR NONWIR LOK OHM 20 0 75W 97979 TK0546G R347 321 0353 00 RES FXD FILM 46 4K OHM 1 0 125W 75042 CEATO 4642F R348 321 0138 00 RES FXD FILM 267 OHM 1 0 125W 75042 CEATO 2670F R350 315 0621 00 RES FXD COMP 620 OHM 5 0 25W 01121 CB6215 R351 315 0471 00 RES FXD COMP 470 OHM 5 0 25W 01121 CB4715 R352 311 1564 00 RES VAR NONWIR 500 OHM 20 0 50W 73138 91A 500ROM R353 315 0302 00 RES FXD COMP 3K OHM 5 0 25W 01121 CB3025 R355 315 0302
27. D COMP 270 OHM 5 0 25W 01121 82715 R392 316 0220 00 RES FXD COMP 22 OHM 10 0 25W 01121 CB2201 R395 315 0201 00 RES FXD COMP 0 OHM 5 0 25W 01121 CB2015 R397 315 0332 00 RES FXD COMP 3 3K OHM 5 0 25W 01121 5 R399 315 0390 00 RES FXD COMP 39 OHM 5 0 25W 01121 CB3905 R400 323 0189 00 RES FXD FILM 909 OHM 15 0 50W 75042 CECTO 9090F R401 321 0065 00 RES FXD FILM 46 4 OHM 1 0 125W 75042 CEATO 46R40F R402 321 0065 00 RES FXD FILM 46 4 OHM 1 0 125W 75042 CEATO 46R40F R405 311 1566 00 RES VAR NONWIR 200 OHM 20 0 50W 73138 91A 200ROM R406 321 0126 00 BOlOlOO B030969 RES FXD FILM 200 OHM 1 0 125W 75042 CEATO 2000F R406 321 0121 00 B030970 RES FXD FILM 178 OHM 15 75042 CEATO 1780F R410 315 0271 00 RES FXD COMP 270 OHM 5 0 25W 01121 CB2715 lrurnished as aunit with S368 3 10 REV C AUG 1974 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number EES Code Mir Part Number 01121 CB2201 RES FXD COMP 22 OHM 10 0 25W R412 316 0220 00 R420 321 0246 00 R422 315 0202 00 R422 315 0162 00 R425 311 0546 00 R427 315 0202 00 R427 315 0162 00 R432 315 0201 00 R460 315 0221 00 R462 321 0055 00 R463 322 0210 00 R465 321 0055 00 R467 315 0221 00 R480 315 0331 00 R481 316 0101 00 R485 315 0331 00 R487 315 0682 00 R490 315 0133 00 R491 315 0623 00 R493 307 0103 00 R495 307 0103 00 R497 307 0103 00 R499 315 0103 00
28. FXD FILM 41 2 OHM 1 0 125W 75042 CEATO 41R20F R247 321 0064 00 BO10338 B019999 RES FXD FILM 45 3 OHM 1 0 125W 75042 CEATO 45R30F R247 321 0060 00 0 RES FXD FILM 41 2 OHM 1 0 125W 75042 CEATO 41R20F R260 315 0221 00 RES FXD COMP 220 OHM 5 0 25W 01121 CB2215 R262 321 0055 00 RES FXD FILM 36 5 OHM 1 0 125W 75042 CEATO 36R50F R263 322 0210 00 RES FXD FILM 1 5K OHM 1 0 25W 75042 CEBTO 1501F R265 321 0055 00 RES FXD FILM 36 5 OHM 1 0 125W 75042 CEATO 36R50F R267 315 0221 00 RES FXD COMP 220 OHM 5 0 25W 01121 CB2215 R270 321 0119 00 RES FXD FILM 169 OHM 1 0 125W 75042 CEATO 1690F R272 315 0301 00 BES EXD COMP 300 OHM 5 5 0 25W 01121 83015 R274 315 0431 00 RES FXD COMP 430 OHM 5 0 25W 01121 CB4315 R276 321 0119 00 RES FXD FILM 169 OHM 1 0 125W 75042 CEATO 1690F R278 315 0820 00 RES FXD COMP 82 OHM 5 0 25W 01121 CB8205 R280 321 0058 00 RES FXD FILM 39 2 OHM 1 0 125W 75042 CEATO 39R20F R281 321 0157 00 RES FXD FILM 422 OHM 1 0 125W 75042 CEATO 4220F R284 321 0146 00 RES FXD FILM 324 011 15 0 7 75042 CEATO 3240F R285 321 0225 00 RES FXD FILM 2 15K OHM 1 0 125W 75042 CEATO 2151F R290 321 0058 00 RES FXD FILM 39 2 OHM 1 0 125W 75042 CEATO 39R20F R291 316 0101 00 RES FXD COMP 100 OHM 10 0 25W 01121 08111 R292 321 0146 00 RES FXD FILM 324 OHM 1 0 125W 75042 CEATO 3240F R296 323 0198 00 RES FXD FILM 1 13K OHM 1 0 50W REV C AUG 1974 3 9 Electrical Parts List 5A48 Tektronix Serial Model No Mfr
29. H0479D C178 281 0564 00 CAP FXD CER DI 24PF 5 500V 72982 301 0203 C183 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500vV 72982 83l 516E102P 055 281 0630 00 CAP FXD CER DI 390PF 5 500V 72982 301 000Y5D0391J C189 281 0547 00 B010100 9 CAP FXD CER DI 2 7PF 10 500V 72982 301 000C0JO279C C189 281 0547 00 20 CAP FXD CER DI 2 7PF NOM VALUE SEL 72982 301 000C0J0279c C190 281 062 3 00 CAP PXD CER DI 650PF 5 500V 72982 301 000Y5D0651J C197 283 0094 00 CAP FXD CER DI 27PF 10 200V C198 281 0544 00 CAP FXD CER DI 5 6PF 10 500V 72982 301 000COHO569D C199 281 0153 00 8010100 9 CAP VAR AIR DI 1 7 10PF 250V 74970 187 0106 005 C199 281 0166 00 B010300 CAP VAR AIR DI 1 9 15 7PF 250V 74970 187 0109 005 C210 281 0623 00 CAP FXD CER DI 650PF 5 500V 72982 301 000Y5D0651J C225 283 0000 00 CAP FXD CER DI 0 001UF 100 0 500v 72982 831 516E102P C230 283 0002 00 CAP FXD CER DI 0 01UF 80 20 500V 72982 811 45 C242 283 0094 00 BO10100 B010337 CAP FXD CER DI 27PF 10 200V C242 281 0579 00 BO10338 BO19999 CAP FXD CER DI 21PF 5 500V 72982 301 050C0G0210J C242 283 0094 00 2020000 9 CAP FXD CER DI 27PF 10 200V C242 281 0564 00 B030970 CAP FXD CER DI 24PF NOM VALUE SEL C247 283 0094 00 210100 7 CAP FXD CER DI 27PF 10 200V C247 281 0579 00 8010338 B019999 CAP FXD CER DI 21PF 5 500V 72982 301 050C0G0210J C247 283 0094 00 252020000 9 CAP FXD CER DI 27PF 10 200V C247 281 0564 00 B030970 CAP FXD CER DI 24PF NOM V
30. LIFIER cowun CH i oi B s ZEROS TSI 12 5 754 d iy Pm VA 159 3 D UNCAL TS 3 Mi 15 2 k 4 COLUMN CH 2 RARES TS s 15 23 x TS T Abo 480c Sy MODE rs 10 TO R232 H 1 TO R395 TO R432 TO 7 CU TN 1 2 5 9 Y DISPLAY ON or Jo 7 ee o n CIH TRIGGER AMPLIFIERS CHANNEL SWITCHING b 6273 0348 Lie le le lel Ja BE HE 8 2 i Mechanical Parts List 5A48 FIGURE 1 EXPLODED CONT Fig amp Index Tektronix Serial Model No Mfr No Part No Eff Dscont 123 4 5 Name amp Description Code Mfr Part Number 1 87 214 0579 00 4 TERM TEST PT 0 40 INCH LONG 80009 214 0579 00 88 337 1656 00 l SHLD ELECTRICAL CH1 CH2 89 348 0031 00 l GROMMET PLASTIC 0 156 INCH DIA 80009 348 0031 00 90 376 0051 01 2 CPLG SHAFT FLEX FOR 0 125 INCH 80009 376 0051 01 213 0022 00 4 SETSCREW 4 40 X 0 188 INCH HEX SOC STL 74445 OBD 354 0251 00 2 RING COUPLING 0 251 ID X 0 375 INCH OD AL 80009 354 0251 00 376 0049 00 l CPLG SHAFT FLEX PLASTIC 80009 376 0049 00 91 2 RES VAR SEE R168 R368 EPL 361 0515 00 XB031673 2 SPACER SWITCH PLASTIC 80009 361 0515 00 92 260 1209 00 l SWITCH PUSH 4PDT 71590 218 8001000 8 93 260 1363 00 l SWITCH PUSH DISPLAY ON 94 260 1364 00 l S
31. M 5 0 25W rE XD COMP e EXD COMP e EXD COMP e EXD COMP e EXD COMP Jw EXD COMP e EXD COMP e EXD COMP EXD COMP 2K OHM 5 0 25W 1 6K OHM 5 0 25W 200 OHM 5 0 25W 36 5 OHM 1 0 125W 1 5K OHM 1 0 25W 36 5 OHM 1 0 125W 220 OHM 5 0 25W 330 OHM 5 0 25W 330 OHM 5 0 25W 13K OHM 5 0 25W 2 7 OHM 5 0 25W 2 7 OHM 5 0 25W 2 7 OHM 5 0 25W 10K OHM 5 0 25W 12 7K OHM 1 0 125W 75K OHM 5 0 25W 150K OHM 5 0 25W 37 4K OHM 1 0 125W 75K OHM 5 0 25W 150K OHM 5 0 25W 150K OHM 5 0 25W 51K OHM 5 0 25W 37 4K OHM 1 0 125W 12 7K OHM 1 0 125W 150K OHM 5 0 25W 37 4K OHM 1 0 125W 75K OHM 5 0 25W 150K OHM 5 0 25W 150K OHM 5 0 25W 251K OHM 5 0 25W 37 4K OHM 1 0 125W 150K OHM 5 0 25W 12K OHM 5 0 25W 75K OHM 5 0 25W 75K OHM 5 0 25W 150K OHM 5 0 25W 12K OHM 5 0 25W RES THERMAL 500 OHM 10 25 DEG C RES THERMAL 500 OHM 10 25 DEG C 75042 01121 01121 97979 01121 01121 01121 01121 75042 75042 75042 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 75042 01121 01121 75042 01121 01121 01121 01121 75042 01121 75042 01121 01121 75042 01121 01121 01121 01121 75042 01121 01121 01121 01121 01121 01121 01121 01121 01121 50157 50157 CEATO 3571F CB2025 CB1625 TKO546G CB2025 CHIO25 CB2015 CB2215 CEATO 36R50F CEBTO 1501F CEATO 36R50F CB2215 CB3315 CB1011 CB33
32. MPLITUDE VOLTS DIV Amplitude Error 5 mV 25 div 5 10 mV 25 div 5 20 mV 12 div 3 50 mV 15 div 3 AV 15 div 3 2V 12 div 3 5V 15 div 3 1 V 15 div 3 2 12 div 3 5V 15 div 3 20 V 12 div 3 50 V 15 div 396 8 Adjust Transient Response Push the DISPLAY CH 1 MODE CH 2 GND and the CH 1 TRIGGER pushbuttons Release all other buttons Set the CH 1 VOLTS DIV switch to 10 m Connect the output of the Type 106 Square Wave Generator through a 50 Q BNC cable and a 50 Q termination to the CH 1 input Set the Type 106 for a frequency of 500 kHz and adjust for a 5 division display Set the 5842 MAIN SEC DIV to 1 u Adjust the 5B42 triggering for a stable display Center the display using the 5A42 and 5A48 POSITION controls Adjust C199 for the best square corner on the waveform Repeat the above procedure substituting CH 2 for CH 1 and adjust C399 for the best square corner on the waveform REV B JAN 1975 03 01c Service Information 5A48 DIAGRAMS PARTS LISTS AND ILLUSTRATIONS Symbols and Reference Designators Electrical components shown on the diagrams are in the following units unless noted otherwise Capacitors Values one or greater are in picofarads pF Values less than one are in microfarads uF Resistors Ohms 2 Symbols used on the diagrams are based on ANSI Y 32 2 1970 Logic symbology is based on MIL STD 806B in terms of positive logic Logic symbols depict the logic
33. NCH LONG as E CONTACT ELEC 0 178 INCH LONG SHLD ELECTRICAL SWITCH PUSH SPACER PB SW BROWN 0 275 INCH LONG ATTACHING PARTS FOR CKT BD BRACKET ANGLE SCR ASSEM WSHR 4 40 X 0 312 INCH PNH BRS _ X m m SHLD ELECTRICAL ATTEN CH 2 ATTACHING PARTS SCR TPG THD CTG 4 24 X0 25 INCH PNH STL m X CKT BOARD ASSY ATTEN CH 2 SEE A2 EPL CONTACT ASSY EL CAM SWITCH BOTTOM CONTACT ASSY EL CAM SWITCH TOP RIVET TUBULAR 0 051 OD X 0 115 INCH LONG CONTACT ELEC GROUNDING ATTACHING PARTS FOR EACH RIVET TUBULAR 0 051 OD X 0 115 INCH LONG K CONTACT ELEC 0 178 INCH LONG SHLD ELECTRICAL SWITCH PUSH AC GND SPACER PB SW BROWN 0 275 INCH LONG ATTACHING PARTS FOR CKT BD BRACKET ANGLE SCR ASSEM WSHR 4 40 X 0 312 INCH PNH BRS NE ACTR ASSY CAM SW BEARING CAM SW CENTER RING RETAINING 0 395 FREE ID X 0 025 STL DRUM CAM SW SPRING FLAT RED COLORED ROLLER DETENT 0 125 DIA X 0 125 INCH L CONTACT ELEC GROUNDING BEARING CAM SW FRONT NUT PLAIN HEX 4 40 X 0 188 INCH BRS ATTACHING PARTS SCR ASSEM WSHR 4 40 X 0 312 INCH PNH BRS k CKT BOARD ASSY MAIN SEE Al EPL CONTACT ASSY EL CAM SWITCH BOTTOM CONTACT ASSY EL CAM SWITCH TOP RIVET TUBULAR 0 051 OD X 0 115 INCH LONG SOCKET PLUG IN 6 CONTACT ROUND CONTACT ELEC 0 188 INCH LONG SOCKET PLUG IN 8 PIN TRANSISTORS MATCHED PAIR EACH PAIR INCLUDES
34. OCK INTL 0 26 ID X 0 40 OD STL m m PUSH PUSH PUSH PUSH PUSH PUSH PUSH BUTTON BUTTON BUTTON PANEL FRONT BUSHING SLEEVE PRESS MOUNT LCH PLUG IN RET ATTACHING PARTS SCR TPG THD CTG 2 56X0 25 100 DEG FLH STL m SHIELD LIGHT LIGHT INDICATOR SUBPANEL FRONT ATTACHING PARTS SCR TPG THD FOR 6 20X0 375 100 DEG FLH STL SHLD ELECTRICAL REAR CLIP ELECTRICAL GROUNDING EXTENSION SHAFT 6 58 INCH LONG EXTENSION SHAFT 0 13 SQ X 6 215 LONG PLSTC EXTENSION SHAFT 5 607 INCH LONG EXTENSION SHAFT 0 124 DIA X 5 15INCH LONG SHLD ELECTRICAL ATTEN CH 1 ATTACHING PARTS SCR TPG THD CTG 4 24 X0 25 INCH PNH STL AAfr Code 80009 80009 74445 80009 74445 80009 74445 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 80009 24931 80009 73743 78471 73743 79807 80009 73743 78189 80009 80009 80009 45722 80009 83385 80009 80009 80009 80009 83385 Mfr Part Number 337 1399 00 366 0494 00 OBD 366 1317 00 OBD 366 1400 00 OBD 366 1286 02 214 1840 00 366 1257 11 366 1257 12 366 1257 14 366 1257 32 356912257917 366 1257 18 366 1257 16 366 1257 199 366 1257 220 426 0681 00 28JR168 1 358 0029 00 2X28269 402 OBD 2X20319 402 OBD 131 1204 00 2X20319 402 1214 05 00 0541C 333 1573 00 358 0378 00 214 1513 01 OBD 386 1916 00 OBD 384 1059
35. OURCE RIGHT in MAIN SWP MODE in All other 5B42 pushbuttons must be out 2 5A48 Presets CH 1 and CH 2 VOLTS DIV 10m CH 1 and CH 2 CAL cw detent CH 1 and CH 2 POSITION midrange DISPLAY in CH 1 and CH 2 MODE DUAL TRACE in CH 1 TRIGGER in CH 1 and CH 2 GND in All other 5448 pushbuttons must be out 3 Adjust DC Levels Connect the positive lead of the DC Voltmeter to TP1 and the negative lead to TP2 Adjust R 152 for a reading of 7 5 volts on the voltmeter Connect the positive lead of the DC voltmeter to TP3 and the negative lead to TP4 Adjust R352 for a reading of 7 5 volts on the voltmeter 4 Adjust DC Balance Position both traces to graticule center with the POSI TION controls Set CH 1 and CH 2 VOLTS DIV to position 1 m Reposition both traces to graticule center by adjusting the front panel STEP ATTEN BAL controls Now adjust the front panel STEP ATTEN BAL controls for no trace shift while switching the VOLTS DIV switches between the 2m and 1m positions Adjust R182 BAL for no trace shift while switching CH 1 VOLTS DIV switch between positions 5m and 2 m Adjust R382 BAL for no trace shift while switching CH 2 VOLTS DIV switch between positions 5 m and 2 m Return the CH 2 trace to graticule center with the CH 2 POSITION control Push the CH 2 INVERT button and check that the CH 2 trace shifts less than 3 major divisions Release the CH 2 INVERT button 5 Adjust Gain set the CH 1 and CH 2 VOLTS DIV
36. SILICON 30V 150MA 07910 1N4152 CR415 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR490 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 3 6 REV E FEB 1975 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number CR491 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR610 152 0141 02 SEMICOND DEVICE SILICON 30V 150MA 07910 1N4152 CR630 152 0141 02 SEMICOND DEVICE SILICON 30V 150 07910 1N4152 DS105 150 0111 00 LAMP GLOW NEON 1 2MA 08806 2AC AT DS110 150 0111 00 LAMP GLOW NEON 1 2MA 08806 2AC AT DS305 150 0111 00 LAMP GLOW NEON 1 2MA 08806 2AC AT DS310 150 0111 00 LAMP GLOW NEON 1 2MA 08806 2AC AT J100 131 0679 00 B010100 BO31398 CONNECTOR RCPT BNC W HARDWARE 24931 28JRl168 1 J100 131 0679 02 B031399 CONNECTOR RCPT BNC W HARDWARE J300 131 0679 00 BO10100 B031398 CONNECTOR RCPT BNC W HARDWARE 24931 28JR168 1 J300 131 0679 02 9 CONNECTOR RCPT BNC W HARDWARE K190 148 0034 00 RELAY ARMATURE DPDT 15VDC 600 OHM 80009 148 0034 00 K390 148 0034 00 RELAY ARMATURE DPDT 15VDC 600 OHM 80009 148 0034 00 L170 276 0507 00 SHIELDING BEAD 0 6UH 78488 57 0180 7D L185 276 0507 00 SHIELDING BEAD 0 6UH 78488 57 0180 7D L370 276 0507 00 SHIELDING BEAD 0 6UH 78488 57 0180 7D L385 276 0507 00 SHIELDING BEAD 0 6UH 78488 57 0180 7D L494 108 0245 00 COIL RF 3 9UH 80009 108 0245 00 L496 108 0245 00 COIL RF 3 9UH 8000
37. WITCH PUSH MODE 95 260 1365 00 1 SWITCH PUSH TRIG SOURCE 96 361 0382 00 4 SPACER PB SW BROWN 0 275 INCH LONG 80009 361 0382 00 97 361 0384 00 9 SPACER PB SW 0 133 INCH LONG 80009 361 0384 00 ATTACHING PARTS FOR CKT BD 98 213 0146 00 4 SCR TPG THD FOR 6 20 X 0 313 INCH PNH STL 83385 OBD 210 0801 01 4 WASHER FLAT 0 140 ID X 0 281 OD STL 12327 NOTE e 99 231 1372500 2 CONTACT ELEC 80009 131 1372 00 100 426 0724 02 1 FR SECT PLUG IN BOTTOM 80009 426 0724 02 101 426 0725 02 1 FR SECT PLUG IN TOP 80009 426 0725 02 102 175 0825 00 FT WIRE ELECTRICAL 2 WIRE RIBBON 2 9 FT LONG 23499 TEK 175 0825 00 103 175 0830 00 FT WIRE ELECTRICAL 7 WIRE RIBBON l 6 FT LONG 08261 TEK 175 0830 00 03 20 Mechanical Parts List 5A48 CROSS INDEX MFR CODE NUMBER TO MANUFACTURER MFR CODE MANUFACTURER ADDRESS CITY STATE ZIP 00779 AMP Inc P O Box 3608 Harrisburg PA 17105 05820 Wakefield Engineering Inc Audubon Road Wakefield MA 01880 08261 Spectra Strip Corp 7100 Lampson Ave Garden Grove CA 92642 12327 Freeway Corp 9301 Allen Dr Cleveland OH 44125 22526 Berg Electronics Inc Youk Expressway New Cumberland PA 17070 23499 Gavitt Wire and Cable Division of RSC Industries Inc 455 N Quince St Escondido CA 92025 24931 Specialty Connector Co Inc 3560 Madison Ave Indianapolis IN 46227 42838 National Rivet and Mfg Co 1 21 East Jefferson St Waupun WI 53963 45722 USM Corp Parker Kalon Fastener Div l Peekay Driv
38. by pushing this button Pre Charging Use of this feature prevents surge currents due to charging the AC coupling capacitor from damaging the circuits under test see Fig 1 2 When using deflection factors of 20 mV Div through 1 mV Div with a test lead or 1X probe push both the AC and GND pushbuttons Connect the 5A48 input to the circuit under test and wait about one second to allow the coupling capacitor to charge to the DC input voltage Release the GND button and the AC signal is now visible on screen Operating Instructions 5A48 FROM INPUT CONNECTOR AC COUPLING CAP 019 uF Fig 1 2 Pre Charging Circuit SPECIFICATIONS All references to divisions or VOLTS DIV refer to major graticule divisions in this manual BANDWIDTH In the 5403 6 div reference signal DC coupled 1mV DIV and 2 mV DIV 225 MHz 5 mV DIV through 10 V DIV 260 MHz Lower end response AC coupled lt 10 Hz lt 1 0 Hz with 10X probe at all deflec tion factors RISETIME lt 14 ns 1 mV DIV and 2 mV DIV 85 8 ns 5 mV DIV through 10 V DIV DEFLECTION FACTOR ACCURACY lt 5 at DIV and 2 mV DIV lt 3 from 5 mV DIV to 10 V DIV from 15 C to 35 C 496 from 5 mV DIV to 10 V DIV from 0 C to 50 C A continuously variable control provides lt 2 5X additional attenuation on each range ABERRATIONS 2 of total 3 of displayed step amplitude COMMON MODE REJECTION RATIO 2 50 1 from 5 V DIV to 10 V DIV up to 1 MHz 20 1 a
39. e Clifton NJ 07014 71590 Centralab Electronics Div of Globe Union Inc 5757 N Green Bay Ave Milwaukee WI 53201 71785 TRW Electronic Components Cinch Connector Operations 1501 Morse Ave Elk Grove Village IL 60007 73743 Fischer Special Mfg Co 446 Morgan St Cincinnati OH 45206 74445 Holo Krome Co 31 Brook St West Hartford CT 06110 78189 Illinois Tool Works Inc Shakeproof Division St Charles Road Elgin IL 60120 78471 Tilley Mfg Co 900 Industrial Rd San Carlos CA 94070 79807 Wrought Washer Mfg Co 2100 S O Bay St Milwaukee WI 53207 80009 Tektronix Inc P O Box 500 Beaverton OR 97077 83385 Central Screw Co 2530 Crescent Dr Broadview IL 60153 97464 Industrial Retaining Ring Co 57 Cordier St Irvington NJ 07111 03 27 Fig amp Index No 1 1 2 12 17 19 20 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 40 41 Tektronix Serial Model No Part No Eff 337 1399 00 366 0494 00 213 0153 00 366 1317 00 213 0153 00 366 1400 00 213 0153 00 366 1286 02 214 1840 00 366 1257 11 366 1257 12 366 1257 14 366 1257 32 366 1257 17 366 1257 16 366 1257 16 366 1257 19 366 1257 20 426 0681 00 131 0679 00 131 0679 02 220 0497 00 210 1039 00 358 0029 00 210 0590 00 210 0978 00 210 0583 00 210 0940 00 131 1204 00 210 0583 00 210 0046 00 333 1573 00 358 0378 00 214 1513 01 213 0254 00 337 1430 00 136 0429 00
40. function performed and may differ from the manufacturer s data The following special symbols are used on the diagrams External Screwdriver adjustment External control or connector Clockwise control rotation in direction of arrow Refer to diagram number indicated in diamond Refer to waveform number indicated in hexagon Connection made to circuit board with interconnecting pin Blue tint encloses components located on circuit board 3 2 Section 3 5A48 REPLACEABLE ELECTRICAL PARTS PARTS ORDERING INFORMATION Replacement parts are available from or through your local Tektronix Inc Field Office 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 developed in our engineering department It is therefore important when ordering parts to include the following information in your order Part number instrument type or number serial number and modification number if applicable If a part you have ordered has been replaced with a new or improved part your local Tektronix Inc Field Office or representative will contact you concerning any change in part number Change information if any is located at the rear of this manual SPECIAL NOTES AND SYMBOLS X000 Part first added at this serial number 00X Part removed after this serial number ITEM NAME
41. h is applied at different times to all of the rear interface connectors associated with the readout circuitry except the 2 column and row lines These are the output lines The readout circuitry in the 5A48 allows the correct amount of current to the appropriate channel row and column lines during the pulse time for the particular character desired See the main frame manual for more details on the particular time slot and currents required for each character Q610 and 0630 apply the correct readout currents for the attenuation of the probe used Test Equipment For calibration and a complete accuracy check of the 5A48 the following equipment is required Tektronix 5403 Oscilloscope Tektronix 5B42 or equivalent Time Base Tektronix Type equivalent 106 Square Wave Generator or Tektronix Standard Amplitude Calibrator 067 0502 00 or equivalent Tektronix 24 pF Input Normalizer 067 0539 00 50 2 BNC Termination 011 0049 01 50 2 5X BNC Attenuator 011 0060 01 50 Q Coaxial Cable 012 0057 01 Voltmeter 220 000 Q V Tektronix DM 501 or equivalent Preparation This instrument should be adjusted at an ambient temperature between 25 C and 30 C 68 F and 86 F for best accuracy Remove the left side plug in cover and install the 5A48 in the center plug in compartment of the 5400 series oscilloscope 1 5B42 Presets POSITION midrange MAIN SEC DIV 1m MAIN TRIG LEVEL cw AUTO TRIG in SOURCE SLOPE in S
42. hannels which are alternately turned on and off as previously described O480 enables channel 2 and Q485 channel 1 by connecting their emitters to 15 V through the MODE switches In the ADD mode both channels are enabled to sum their signals across their common load resistors Additional contacts on the CH 1 and CH 2 switches give information to the main frame channel switch and provide power to the lights behind the VOLTS DIV switch skirts Trigger Amplifier The paraphase trigger signal from the vertical channels is applied to the emitters of O270 and 0275 Only one channel trigger is used at any one time the other is shorted When both CH 1 and CH 2 TRIGGER switches are out Q272 turns on and sinks the collector current from both vertical channel trigger amplifiers maintaining stable DC levels throughout the circuit The active channel trigger is amplified by 0270 and 0275 which drive 0280 and Q290 Q290 drives O292 whose output is sent to the horizontal plug in through the rear interface connector 0280 drives Q285 an additional stage for phase inversion Its output is combined with the output of Q292 through R296 The circuit provides single ended output for differentially applied signals thus a high degree of cancellation of common mode signals Readout The DISPLAY CH 1 and CH2 MODE CAL CH 2 INVERT and VOLTS DIV switches have contacts wired into the readout circuitry A OV to 15 V pulse approxi mately 125 us in lengt
43. ic Components IRC Fixed Resistors Philadelphia Division 78488 Stackpole Carbon Co 80009 Tektronix Inc 90201 Mallory Capacitor Co Div of P R Mallory Co Inc 91637 Dale Electronics Inc 97979 Reon Resistor Corp 3 4 CROSS INDEX MFR CODE NUMBER TO MANUFACTURER ADDRESS 1201 2nd St South Electronics Park 464 Ellis St 12515 Chadron Ave Nela Pk 4300 Redwood Hwy 2201 Laurelwood Rd 3560 Madison Ave 35 Hoffman Ave P O Box 787 5757 N Green Bay Ave 644 W 12th St 2500 Harbor Blvd 299 10th Ave S W 401 N Broad St P O Box 500 3029 E Washington St P O Box 609 63 Lincoln Hwy CITY STATE ZIP Milwaukee WI 53204 Syracuse NY 13201 Mountain View CA 94042 Hawthorne CA 90250 Cleveland OH 44112 San Rafael CA 94903 Santa Clara CA 95054 Indianapolis IN 46227 Happauge NY 11787 Muskegon MI 49443 North Adams MA 01247 Milwaukee WI 53201 Erie PA 16512 Fullerton CA 92634 Waseca MN 56093 Philadelphia PA 19108 St Marys PA 15857 Beaverton OR 97077 Indianapolis IN 46206 Columbus NB 68601 Fraser PA 19355 REV C AUG 1974 e ri F3 Electrical Parts List 5A48 Tektronix Serial Model No Mfr Ckt No Part No Eff Dscont Name amp Description Code Mfr Part Number Al 670 2068 00 CKT BOARD ASSY MAIN 80009 670 2068 00 A2 670 2574 00 CKT BOARD ASSY CH2 ATTENUATOR 80009 670 2574 00 A3 670 2575 00 CKT BOARD ASSY CHl ATTENUATOR 80009 670 257
44. illoscopes The unit contains two in dependent amplifier channels with identical characteristics The channels may be used for single channel displays combined for algebraically added displays or electronically switched to produce simultaneous dual trace displays Provision for inversion of Channel 2 signals permits differential displays Illuminated VOLTS DIV knob skirts directly indicate deflection sensitivities The plug in has readout encoding capabilities When used in an oscilloscope with readout capabilities the deflection sensitivities are displayed on the CRT When used with Tektronix probes with readout capabilities the plug in indicates the de creased deflection sensitivity on the knob skirt as well as on the CRT When operating in the two most sensitive positions the reduced bandwidth is visible through the VOLTS DIV knob skirt The plug in is designed as a vertical amplifier but may be used in the horizontal compartment for certain X Y displays PREPARATION FOR USE Your 5A48 is calibrated and ready for use when re ceived Fig 1 1 shows installation removal procedure The 5A48 will operate in the horizontal compartment of the Power Supply Amplifier module When using X Y dis plays remember that the vertical channel is delayed ap proximately 150 nanoseconds 3 phase shift at 50 kHz by the vertical delay line Refer to the Front Panel Controls amp Connectors illustration on the Controls amp Connectors
45. in frame through the rear interface connector Trace positioning is accomplished by changing the current division between Q195 and Q215 through the position control R225 and constant current source Q220 Trigger signals are taken from the emitters of 0190 and 0210 amplified by 0 and Q265 and passed to the trigger switch Channel 1 is turned off by bringing the bases of Q195 and Q215 positive through R217 Q230 and Q235 are turned on through R232 shorting any signal through their common collectors They also replace the current drawn by 0195 and Q215 through R195 and R215 respectively keeping the DC operating conditions stable Channel 2 signals are applied at the collectors of Q195 and Q2 15 Channel 2 Amplifier The circuit description for channel 1 describes the operation of channel 2 with minor exceptions S390 inverts the output of channel 2 by cross switching the signals 0395 and 0415 perform the same function as 0195 and 0215 0430 and 0435 are functionally identical with 0 and Q235 Channel Switch A signal 0 to 4 V from the main frame is present at pin 21 of the rear interface connector This signal is timed by the start of the sweep alternate mode or by a free running multivibrator chopped mode CR490 and CR491 limit the excursions of this signal In the DUAL TRACE mode the signal is connected to the base of 0485 whose emitter is connected to the emitter of Q480 Their collectors are connected to the vertical c
46. o the base of O150 The signal at the emitter of Q150 follows the signal at the gate of Q140A A divider string consisting of R159 R161 R163 and R164 provides attenuation to O 170 Attenuation is 1X when R158 is connected 2X through R161 and 4X through R164 The gain of Q150 and Q155 does not change only the signal driving Q170 is attenuated See Fig 2 1 for a simplified diagram of the attenuation circuit SIG OUT Virtual Signal Ground Fig 2 1 Simplified diagram of attenuation and single ended to paraphase transition Ai 2 1 Theory of Operation 5A48 R152 sets the correct DC operating point for Q150 and 0155 0170 and 0185 form a paraphase amplifier Their collectors drive O172 and Q187 which are current driven to reduce Miller effect RT178 changes resistance and consequently the gain of Q170 and Q185 so that the gain remains constant with changes in temperature O170 and 0185 provide a gain of about 3 R189 is switched out of the circuit by K190 to increase the gain to 15 in the two most sensitive positions CR 190 and CR210 are protective diodes 0190 and Q210 provide additional amplification C 199 affects high frequency gain These transistors current drive Q195 and O215 to reduce Miller effect and thereby improve high frequency response The output of Q195 and 0215 drives the bases of Q240 and 0250 across load resistors common to both channels R230 and R235 Their emitters drive the vertical amplifier in the ma
47. switch to position 10 m Make certain the DISPLAY CH 1 MODE CH 1 TRIGGER and CH 2 GND pushbuttons are in All other pushbuttons must be out Connect the Standard Amplitude Calibrator output set for 50 mV through the BNC coaxial cable to the CH 1 input connector Adjust the 5B42 MAIN TRIG LEVEL for a stable display Adjust R205 for exactly 5 major divisions of display Now push the CH 1 GND CH 2 MODE and CH 2 TRIGGER buttons Release all other buttons except the DISPLAY button Connect the coaxial cable to the CH 2 input Adjust R405 for exactly 5 major divisions of display 6 Adjust Input Capacitance and Compensate Attenuator The DISPLAY CH 2 MODE CH 1 GND and CH2 TRIGGER must be depressed Set both CH 1 and CH 2 VOLTS DIV switches to the 20 m position All other pushbuttons must be out Connect the HI AMPLITUDE OUTPUT of the Type 106 through a 50 Q cable 5X attenuator 50 2 termination and the 24 pF Normalizer in that order to the CH 2 input Set the square wave generator to a frequency of 1kHz and adjust its amplitude for a display of 5 major divisions Proceed to part A in Table 3 1 03 01a INTERNAL ADJUSTMENT PROCEDURE W R205 C199 R152 R182 Gain Transient 7 5 V Adj TP2 Bal Response TP3 TP4 9 C399 R405 R352 R382 Transient Gain 75 V Adj Bal Response Channel 1 Attenuator Board C324 C314 Channel 2 Attenuator Board 9 C326 C316 C334 03 01b and perform the adj
48. t 1 mV DIV to 2 mV DIV up to 1 MHz CHANNEL ISOLATION 250 1 to 60 MHz with both traces displayed STABILITY gt 0 3 mV vertical shift in any one minute after one hour warmup ambient temperature and line 2 voltage held constant 0 2 mV C vertical shift witn line voltage held constant INPUT RESISTANCE AND CAPACITANCE Input 1 MQ within 0 596 shunted by approximately 24 pF MAXIMUM SAFE INPUT VOLTAGE DC coupled 250 V DC Peak AC AC component 500 V peak to peak maximum 1 kHz or less AC coupled 500 V DC Peak AC AC component 500 V peak to peak maximum 1 kHz or less TEMPERATURE RANGE OC to 50 C operating 40 C to 70 C nonoperating ALTITUDE RANGE lt 15 000 feet operating 0 feet nonoperating DIMENSIONS 5 0 in 12 5 cm H 2 6 in 6 7 cm W 12 0 in 30 5 cm L WEIGHT 2 Ibs 0 9 kg 1 3 Operating Instructions 5A48 SUPPLEMENTAL INFORMATION DISPLAYED NOISE lt 300 uV at 5 mV DIV tangen tially measured in a 5400 series mainframe STEP ATTENUATOR BALANCE lt 1 division vertical trace movement as VOLTS DIV switch is rotated through its range 14 INVERT SHIFT x3 divisions vertical trace shift when CH 2 INVERT button is pushed in POSITION RANGE 7 divisions from graticule center SIGNAL DELAY BETWEEN CHANNELS 700 ps t Introduction Refer to the complete schematic diagrams and the block diagram located in the pullout pages at the back of this manual
49. ustments as indicated adjusting the square wave generator to an amplitude of 5 major divisions for each position of the VOLTS DIV switch After com pleting part A repeat the above procedure for CH 1 following the instructions in part B of Table 3 1 The square wave level rolloff or overshoot must not exceed 0 1 major division in any positions of either VOLTS DIV switch TABLE 3 1 Part A Part B CH 2 Adjust CH 1 Adjust VOLTS Adjust Front VOLTS Adjust Front DIV Level Corner DIV Level Corner 1 Check front corner 1 Check front corner 2 Check front corner 2 front corner Remove 5X Attenuator C316 Check front corner C314 Check front corner Check front corner EM Check front corner Check front corner Check front corner Check front corner Check front corner 7 Check VOLTS DIV Accuracy Make certain the DISPLAY CH 1 MODE and CH 1 TRIGGER pushbuttons are in Release all other push buttons Set the CH 1 and CH 2 VOLTS DIV switch to the 1 m position Set the Standard Amplitude Calibrator to the 5 mV position and connect it to the CH 1 input with the 50 Q BNC cable Check the CH 1 attenuator according to Table 3 2 noting the maximum error Reconnect the Standard Amplitude Calibrator to CH 2 obtain a display with CH 2 by pressing the CH 2 MODE and CH 2 TRIG GER buttons Release the buttons for CH 1 Repeat the above procedure for CH 2 using Table 3 2 as a guide 5A48 TABLE 3 2 A

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