Tektronix 7B70 Instruction Manual Download

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Summary of Contents for 7B70

Page 1: ...Tektronix Inc P O Box 500 Beaverton Oregon 97005 I B A S E S N B 2 0 5 O O O AND UP INSTRUCTION MANUAL Serial Number 070 1579 00 Scans by ArtekMedia O 2006 473...

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

Page 3: ...e the instr r and Serial Number w y Tektronix Inc Beaverton Oregon Printed in the United States of America All rights resewed Contents of this publication may not be reproduced in any form without per...

Page 4: ...al Characteristics Altitude Physical Characteristics Finish Dimensions Weight SECTlOlV 2 OPERATING INSTRUCTIOIVS General Installation Front Panel Controls Test Setup Chart General Operating Informatio...

Page 5: ...ription Detailed Circuit Description Trigger lnput Trigger Amplifier lnput Stage Peak Detector Slope Comparator Output Stage Trigger Generator Trigger Pulse Generator Sweep Gate Stage Triggered Hold O...

Page 6: ...e General Preliminary Control Settings Check Adjust Steps refer to Short Form Procedure for index to steps SECTION 6 ELECTRICAL PARTS LIST Abbreviations and Sym bols Parts Ordering Informatioil Index...

Page 7: ...7B70 SN B205000and Up Scans by ArtekMedia O 2006 Fig 1 1 7870 Time Base...

Page 8: ...fier to display signals applied to minutes TABLE 1 1 ELECTRICAL CHARACTERISTICS Performance Start of Sweep 12 ns in 7900 Characteristic Swee Rate Calibrated Range Time Interval 1 1 5 t 0 3 5 O C O O C...

Page 9: ...ne sweep only 0 3div 0 3div TABLE 1 1 cont 7 5 m x 75mV Internal Trigger Jitter ExternalTrigger lnput Voltage volts P PAC at 1 kilohertz or less 1 nanosecond or less at 150 mega hertz Input R and C 1...

Page 10: ...operation except delaying sweep To install the 7B70 into a plug in compartment push it in until it fits firmly into the indicator plug in compart ment To remove pull the release latch see Fig 2 11 to...

Page 11: ...e range of the applied trigger signal When the LEVEL1 SLOPE control is outside the amplitude range the trigger rep etition rate is outside the fre quency range selected by the COUPLING switch or the t...

Page 12: ...lly from a vertical unit LINE Trigger signal obtained in ternally from a sample of the line voltage applied to this in EXT TRIG IN or strument EXT VOLTS IN EXT Trigger signal obtained from an external...

Page 13: ...at X I For accurate sweep timing apply a signal of known frequency or time period time mark signal calibrator square wave 60 hertz line etc to the associated vertical amplifier unit and adjust the TIM...

Page 14: ...GERING TR16 0 0 MODE C O U P L I I Y G SOURCE NORM AC HFRW SIROLE EX1 m FINE POSITION MAGNIFIER XI XIO VARIABLE CAL IN TIME DIV DISPLAY MODE TIME BASE 0 EXT TRIG IN OR EXT VOLTS IN TEKTRONIX El 17 701...

Page 15: ...orizontal mode to dis play the B time base 7B70 6 If a delayed sweep with less jitter is desired pressthe A time base B TRIGGERABLE AFTER DELAY push button The triggering controls of the 7B70 must be...

Page 16: ...TRIG D light may be off indicating that the sweep is not triggered The cause might be a misad justed LEVELISLOPE control incorrectly set COUPLING or SOURCE switches low trigger signal amplitude or a t...

Page 17: ...DE Then without changing the other TRIGGERING controls press the SINGLE SWP pushbutton When ready to view the single sweep display press the RESET READY push button A single trace is presented each ti...

Page 18: ...y trigger signal reaches a DC level selected by the setting of causing the triggering point to vary also This shift of the the LEVELISLOPE control When using internal triggering triggering point may b...

Page 19: ...h starts on the desired slope of the input signal Trigger Level The LEVELISLOPE control determines the voltage level on the trigger signal at which the display is triggered as well as selecting the tr...

Page 20: ...ositiveslope region CRT displays obtained with LEVELISLOPE control in negativeslope region L TRIG D k A 1 Y TRIG D I1 L At 1 I _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___ TRWD L At 1 a e N TRIG D L Al I...

Page 21: ...XIO MAG I FIER visible on the screen in magnified form see Fig 2 9 button is lighted The equivalent magnified sweep rate is Equivalent length of the magnified sweep is more than 100 divisions any 10 d...

Page 22: ...ange the VARIABLE TIMEIDIV control after obtaining the desired deflection This display can be used as a reference for fre General quency comparison measurements The following information describes the...

Page 23: ...9 Multiply the distance measured in step 8 by the sion factor formula step4 setting of the TIMEIDIV switch If sweep magnification is used divide this answer by 10 Horizontal 2 19 milliseconds Convers...

Page 24: ...s shown in Fig 2 11 the 10 point is 0 5 division up from the start of the rising portion 1 Frequency I 2 kilohertz time duration 0 5 ms 9 Measure the horizontal distance betweenthe 10 and 90 points Be...

Page 25: ...IER dial to move CHOP or ALT see Oscilloscope Manual discussion on hori the pulse or rising portion of the B sweep to the center zontal mode switching to display both Time Base sweeps vertical line No...

Page 26: ...ation procedure Apparent Magnification A TIMEJDIV setting DelayedSweep B TIMEIDIV setting 1 Connect the signal to either vertical plug in Set the lndicator Oscilloscope vertical MODE selector to displ...

Page 27: ...e display in the conventional manner Sweep rate is determined by the setting of the 7870 TIMEIDIV selector Example Fig 2 14 shows a complex waveform as dis played on the CRT The intensified portion of...

Page 28: ...e two signals can be determined from the lissajous pattern as follows 4 Connect the Y signal to the 7870 in the vertical com partment and the X signal to the 7870 in the horizontal compartment 5 Cente...

Page 29: ...for P P AUTO mode operation The peak sensing circuits set the range of the LEVEL control to allow triggering over most of the range of the input signal This circuit contains level mode coupling and so...

Page 30: ...voltage null between the push pull output lines A divide by 10 attenuator network in the input to this ampli fier can be selected by the front panel EXT 10 push button to extend the triggering level r...

Page 31: ...ing network The output of the Peak Detector sets the voltage applied to the LEVEL control R146A so that the range of the LEVEL control corres ponds to the peak to peak amplitude or less of the input s...

Page 32: ...unnel diode VR304 is quiescently in its low voltage state The signal from the Trigger Ampli fier switches it to its high voltagestate causing a negative going fast rise pulse at the base of 0317 and a...

Page 33: ...pled0350 is turned off to discon nect the bright line auto circuit from the sweep gate stage When the TRIGGERING MODE switch is in the NORM or SINGLE SWEEP position the anode of CR355 is clamped to gr...

Page 34: ...gnals for use in the Plug in SWEEP START GATE DISCONNECT AMPLIFIER 0526 Scans by ArtekMedia O 2006 77CT SAWTOOTH SWEEP SAWTOOTH GENERATOR TO RT 0532 0533 HORIZONTAL 0534 0537 PREAMP 50 V SWEEP START A...

Page 35: ...to pull up The positive side of the Timing Capacitor being tied to the collector of 2534 is also pulled up This action results in a positive going voltage being applied across the Timing Capacitor mai...

Page 36: ...eration General Operation of the Sweep Generator Circuit in the SINGLE SWEEP position of the TRIGGERING MODE switch is similar to operation in the other modes However after one sweep has been produced...

Page 37: ...he sweep inhibit is held at about the 0 mA level The delay mode control voltage is clamped to ground The A time base has no control over the B time base and each operates as an independentTime Base HO...

Page 38: ...use overheatingand component breakdown Dirt on com important that the cause of overheating be corrected to ponents acts a s an insulating blanket and preventsefficient prevent a recurrenceof the damag...

Page 39: ...nce values of wire wound resistors are printed on the body of the component The resistance values of composition resistors and metal film resistors are color codedon the components some metal film res...

Page 40: ...perating correctly Check that the signal is properly connected and that the probe cable is not defective The indicator oscilloscope and vertical plug inunit can be checked for proper operation by subs...

Page 41: ...t no output Refer to oscilloscope manual a P Set the 7870 COUPLING lit _ to EXT and apply a 1 kHz Check trigger amplifier and light signal to the EXT TRIG IN trigger generator circuits connector TRIG...

Page 42: ...I k scale The diode resistance should be very high in one direction and very low when the meter leads are reversed Do not check tunnel diodes or back diodes with an ohmmeter Do not use an ohmmeter sc...

Page 43: ...er joint with a flux removingsolvent Component Replacement piiFl Disconnect the equipment from the power source before replacing components Relay Replacement The relays in the 7B70 are manu factured b...

Page 44: ...tronix Inc Order Tektronix Part No 040 0542 00 A CIRCUIT BOARD PINS To replace a pin which is mounted on a circuit board first disconnect any pin con nectors Unsolder the damaged pin and pull it out o...

Page 45: ...unsolder the damaged contact and clean the solder from the hole in the circuit board Following the procedure given in the instruc tion sheet included with the cam switch replacement kit use the alignm...

Page 46: ......

Page 47: ...SN 6205000 and Up R785 Magnified Sweep Gair C537 Sweep Start Linearity C530L 2 ps Taming Fig 4 5 Time Base board front view showing location of components and adjustments Scans by ArtekMedia O 2006 R...

Page 48: ...Maintenance 7B7O SN B205000 and Up OD Fig 4 6 Interface board left side showing location of components and connections I 4 11 Scans by ArtekMedia O 2006...

Page 49: ...Maintenance 7B70 SN B205000 and Up Fig 4 7 Interface board right side showing location of components and connectors Scans by AtfekMedia O 2006...

Page 50: ...Maintenance 7B70 SN B205000 and Up External Input Gain Fig 4 8 External board showing location of components and connectors Scans by ArtekMedia O 2006...

Page 51: ...h the desired check or checks If any controls need to be changed from the preliminary settings for this portion of the calibration procedure they are listed under the heading Partial Procedure To prev...

Page 52: ...able triggering on a 0 5 division 50 kHz signal with the LEVELISLOPE control set to 6 30 Performance Correct Incorrect 3 Adjust Negative Slope P P AUTO Level Page 5 5 R155 Requirement Stable triggerin...

Page 53: ...ivegraticule lines Performance Correct ___ lncorrect Performance Correct Incorrect 11 Check Horizontal Amplifier Gain Page 5 6 18 Chec k Adjust Magnified Sweep Gain Page 5 10 R785 Requirement Display...

Page 54: ...with the least interaction of adjustments and reconnection of equipment The control settings continue from the precedingstep s unless noted otherwise The following procedure usesthe equipment listed u...

Page 55: ...K For stable triggering with the LEVEL1 c ADJUST R251 for a stable display See Fig 5 1 for SLOPE control near 3 00 and near 9 OO Check for a free location of adjustment running sweep at all other posi...

Page 56: ...to bring the dot on to the display area While rotating the AMPLIFIER VARIABLE control adjust R186 for minimum movement of the dot as the VARIABLE control is rotated throughout its range 9 Adjust Exter...

Page 57: ...g and a lit TRIG D lamp for each condition listed Use the TIMEIDIV control as necessary for optimum viewing of display TABLE 5 1 7870 1 Sine WaveGenerator 200 Hz 0 5 div AC HF REJ 200 Hz 0 5 div 200 H...

Page 58: ...drift 200 MHz 200 MHz 200 MHz I CHECK Using the control settings in Table 5 5 d Disconnect the Calibration Fixture 7 connector check for stable triggering and a lit TRIG D lamp for each and attenuator...

Page 59: ...Procedure If beginning a partial procedure with this step set the controls as given under Preliminary Control Settings except as follows 7A16A VOLTSJDIV 2 V 7B70 TIMEJDIV 1 rns 17 CheckIAdjust Sweep C...

Page 60: ...th markers must coincide exactly with their respective graticule lines use the horizontal POSITION control a s necessary to line up the display e CHECK Timing accuracy is within 5 over any two divisio...

Page 61: ...e not on the extender If the erator for 10 ms markers optional flexible plug in extender is available the 7A16A may be connected through it to provide easier access to adjustments on the left side of...

Page 62: ...and sweep foldover near the start of the sweep C537 adjustment is effective only with h her performance main frames such as the 7900 series and may be adjusted to optimize the performance of the plug...

Page 63: ...djust Volts Div B Inten sity and triggering for a stable display TABLE 5 8 I ms I ms 5 ms 7670 TIMEIDIV 02ps 05 p s I ps 2 ps 5 us 1 2 1 k0 16 div 26 Check Magnified Sweep Timing a CHECK With the MAGN...

Page 64: ...TimeIDiv Cal In Oscilloscope Vertical Mode Left Horizontal Mode A A Trigger Source Left Vert B Trigger Source Right Vert A Intensity Adjust for viewable trace b Connect a 10X probe from the 7A16A to...

Page 65: ...you concerning any change in part number Change information if any is located at the rear of this manual SPECIAL NOTES AND SYMBOLS X O O O Part first added at this serial number O O X Part removed af...

Page 66: ...a Division Tektronix Inc Bourns Inc Instrument Div Beckman Instruments Inc Mallory Capacitor Co Div of P R Mallory Co Inc ADDRESS P 0 Box 128 1201 2nd St South P 0 Box 5012 Electronics Park 5005 E McD...

Page 67: ...CER DI 35PF 1 500V CAP FXD CER DI 3 3PFr30 200V CAP FXD CER DI 3 3PF 0 25PF 500V CAP FXD CER DI 2 2PF O lPF 500V CAP FXD CER DI 1000PF loo 0 200V CAP FXD CER DI 1000PF 100 0 200V CAP FXD CER DI O O22...

Page 68: ...0 00 C48 283 0000 00 ClOO 281 0544 00 C104 281 0544 00 C106 283 0000 00 CAP FW CER DI O O22UF 80 20 25V CAP FXD CER DI O O01UF 100 0 500V CAP FXD CER DI 5 6PF 10 500V CAP FXD CER DI 5 6PF 10 500V CAP...

Page 69: ...CER DI O OOIUF1 lOO 0 500V CAP FXD CER DI 18PF 5 50V CAP FXD CER DI O 022UF 80 20 25V CAP FXD ELCTLT 3UF 10 150V CAP FXD CER DI lUF 80 20 25V SEMICOND DEVICE SILICON 15V 50MA SEMICOND DEVICE SILICONt1...

Page 70: ...P TRANSISTOR SILICON NPN TRANSISTOR SILICON NPN TRANSISTOR SILICON PNP TRANSISTOR SILICON PNP TRANSISTOR SILICON NPN TRANSISTOR SILICON NPN TRANSISTOR SILICON NPN SEL FROM MPS918 TRANSISTOR SILICON NP...

Page 71: ...1001F RES FXD FILM 9 76K OHM 1 0 125W RES FXD FILM llK OHM 1 0 125W RES FXD FILM 9 09K OHM11 0 125W RES FW COMP lK OHM15 0 25W RES FXD COMP 1 5K OHM15 0 25W RES FXD COMP 1 2K OHM 5 0 25W RES FXD COMP...

Page 72: ...OHM 5 0 25W RES FXD COMP 220 OHM 5 0 25W RES FXD COMP 220 OHM 5 0 25W RES FXD COMP 1 5M OHM 5 O 25W RES FXD COMP 4 7K OHM 5 0 25W RES FXD COMP 120K OHMr5 0 25W RES FXD COMP 15K OHMr5 0 25W RES FXD COM...

Page 73: ...XD COMP lK OHM 5 0 25W RES FXDtCOMP 30K OHM 5 0 25W RES FXD COMP lK OHM15 0 25W 01121 CB1025 RES FXD COMP 150K OHM15 0 25W 01121 CB1545 RES FXD COMP ZZK OHM 5 0 25W 01121 CB2235 RES FM COMP 3K OHM15 0...

Page 74: ...06M OHM11 0 50W RES FXD1FILM 6 19M OHMr1 0 50W RES FXD FILM 4 75M OHM 1 0 50W RES FXD1FILM 4 75M OHM11 0 50W RES FXD FILM 1 425M OHM 0 5 0 50W RES FXD FILM 71 25K OHM 0 1 0 50W RES FXD COMP 33 OHMt5...

Page 75: ...LECTED CAP FXDICER DI 0 2UF 80 20 25V RES FXD FILM 23 7K OHM 1 0 125W PUSH BUTT0N COUPLING CKT BOARD ASSY MODE PUSH BUTTON MODE CKT BOARD ASSY TIME BASE CAP FXD CER DI 0 022UF 80 20 25V CAP FXD CER DI...

Page 76: ...2 ZUF 20 20V CAP FXD CER DI O 022UF1 80 20 25V CAP FXD ELCTLT 2 2UF120 20V CAP FXD ELCTLT 2 2UF 20 20V CAP FXDrELCTLT 2 2UFr2O 2OV CAP FXDIELCTLT 2 2UF 20 20V SEMICOND DEVICE SILICON140PIV 150MA SEMI...

Page 77: ...COND DEVICE SILICON 40PIV 150MA SEMICOND DEVICE SILICON 40PIV 150MA SEMICOND DEVICE SILICON 4OPIV 150MA SEMICOND DEVICE SILICON 40PIV 150MA 07910 IN4152 SEMICOND DEVICE SILICON 40PIV 150MA 07910 1N415...

Page 78: ...0 125W RES FXD COMP 47 OHM 5 0 25W RES FXD FILM 255 OHM11 0 125W RES FXD FILM 215 OHM 1 0 125W RES FXD FILM 5 62K OHM 1 0 125W RES FXD FILM 3 4K OHM 1 0 125W RES FXD FILM 536 OHM11 0 125W RES FXD COMP...

Page 79: ...l O 125W RES FXD FILM 909 OHM11 0 125W RES FXD COMP lOO OHM15 0 25W RES FXD COMP 1 6K OHM 5 0 50W RES FXD COMP 47 OHM15 0 25W RES FXD FILM 11 5K OHM 1 0 125W RES FXD FILM ZK OHM 1 0 50W RES FXD COMP...

Page 80: ...7 5K OHM15 0 25W 01121 CB7525 RES FWIFILM 2 32K OHM11 10 125W 75042 CEATO 2321F RES VAR NONWIR ZOK OHM 20 RES FXD FILM lOK OHM 1 0 125W RES FXD FILM lOK OHM1l O 125W RES FXDICOMP 51 OHM 5 0 25W RES F...

Page 81: ...ed to circu t board Connect on made ro c r c u t board w t h interconnecting pln d Blue tlnt encloses components located on c rcuit board The following prefix letters are used as reference designators...

Page 82: ...L A 3 A 5 W P 5 A W T O O T k OUT 6 3 b 5 W P OUT A I I 5 1 6 N A L OUT 8 1I ir S W L L P hn PIT C S C PcRP 34 I L S E T C o b R O CWil B E AC PL F ER b r n 8 2 4 I G C 4 1 6 8 Q424 GLhB L 9 4 HOLDQFF...

Page 83: ...d on positive slope P PAUTO AC EXT X I 1 mS CAL IN TIME BASE Centered Fully counterclockwise The following control settings and connectionswere changed to obtain waveform photographs 7B71 As shown on...

Page 84: ...7 8 7 0 PLUG IN D itally remastered by ArtekMedia O Zm2 2006 N O T E S I SEE PARTS L I S T FOR SEMICONDUCTOR T Y P E S 2 X HLAT SINKCD TRIGGER INPUT 0O O...

Page 85: ...D itally remastered by ArtekMedio Z m Z Z a I I SEE PARTS L 5 T FOR SEM CONDUCTOR T Y P E S...

Page 86: ...ed by ArtekMedio 2 2 2006 NOTE PART A L 7 R GGER B O A R D P A R T hL 5 273 INTkRFACL B O A R D Vsrtlcal deflection factor shown on wweformr doer not nclude ansnuation factor of the 10X Probe 0 7 8 7...

Page 87: ...PARTIAL U T L R F A C P 7 8 7 0 PLUG IN T R I G G L R G L N L R A T O R...

Page 88: ...S I C O M M O N J REFERENCE D I A G R A M 5 TRIGGER INPUT TRIGGER A M P L I F I E R PEAK D E T E C T O R TRIGGER GENERATOR T I M E B A S E GENERATOR H O R I Z O N T A L P R E A M P N OUTPUT I M A G N...

Page 89: ...D ita ly remastered by ArtekMedia ZW ZOY76 NOTE Vsrtlcal deflection factor shown on waveforms doer not lncludsattenuation factor of the 10X Probe 7870 PLUG IN...

Page 90: ......

Page 91: ...dltlnns gwen on Diagram...

Page 92: ...stered by AriekMedk 2002 2006 R 6 C 5 47 _V h 5 1 L cecs R 6 0 7 120 A cec7 k E C 9 G C c 7 S I N G L E SWLELP M O D E F R O M R 461 7 5 V L I G H T S 2 SWEEP 1 E A V M C Z E Z C U T 7 S L 1 C 3 5 7 R...

Page 93: ...ly andlor Component Attaching parts for Assembly andlor Component _ _ _ _ _ Detail Part of Assembly andlor Component Attaching parts for Detail Part Parts of Detail Part Attaching parts for Parts of D...

Page 94: ...ire and Cable Division of RSC Industries Inc N L Industries Inc Southern Screw Div P 0 Box 3608 7100 Lampson Ave 10 Esna Park Dr Youk Expressway 455 N Quince St P 0 Drawer 570 40 Bristol St 1501 Morse...

Page 95: ...G PARTS SCREW MACHINE l 72 X 0 25 82 DEG FLH STL LWH0LDER WHITE PLASTIC LENS LIGHT GREEN BASE LAMPHOLDER O 29 OD X 0 19 CASE CKT BOARD ASSY MODE TRIGGERING HOUSING LIGHT ATTACHING PARTS SCREW THREAD F...

Page 96: ...CH PNH STL NUT PLAIN HEX 2 56 X 0 188 INCH BRS WASHER LOCK INTL O 092 ID X 0 18 0D STL RING RETAINING FOR 0 25 INCH SHAFT ROLLER DETENT O 125 DIA X 0 125 INCH L SPRING FLAT GOLD COLORED SPRING FLAT GR...

Page 97: ...8 CASE COVER HALF XSTR FOR DUAL TO 18 CS 2 56 THD SOCKET PLUDIN 3 PIN SOCKET RELAY B PIN SOCKET PLUG IN 8 CONTACT ROUND CONTACT ELEC FOR 0 025 INCH SQUARE PIN SOCKET TRANSISTOR 3 PIN TERM TEST PT 0 40...

Page 98: ...312 INCH BRS CL1P COMPONENT MOUNTING ATTACHING PARTS FOR EACH SPACER SLEEVE 0 250 INCH DIA PLASTIC WIRE ELECTRICAL 2 WIRE RIBBON WIRE ELECTRICAL 4 WIRE RIBBON WIRE ELECTRICAL 5 WIRE RIBBON WIRE ELECT...

Page 99: ...7B70 TIME BASE...

Page 100: ...ACCESSORIES Fig Q Index Tektronix SerialIModel No t No Part No Eff Disc y 1 2 3 4 5 Description 2 070 1579 00 1 MANUAL instruction B205000 up 7B70 TIME BASE B205000 up Scans by Artekhledia O 2006...

Page 101: ...art No 065 01 25 00 004 0241 00 004 0242 00 004 0243 00 004 0748 00 Q SerialIModel No t Eff Disc y 1 2 3 4 5 Description 1 CARTON ASSEMBLY carton assembly incl 2 CASE HALF 1 END CAP rear 1 END CAP fro...

Page 102: ...change informationsheets are carried in the manual until all changes are permanently entered some duplication may occur If no such change pages appear following this page your manual is correct as pri...

Page 103: ...V output Short proof output 115 Paired Burst Gated Delayed 8 Un delayed pulse mode f l O V output Short proof output 2101 Paired Delayed Undelayed and out put locked on mode 10 V output PG 506 replac...

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