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Tektronix TYPE L, Instruction Manual, Page: 3 / 46

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CONTENTS

W a rra n ty-

Section  1

Characteristics

S e c tio n   2

O p e r a t in g   In s tr u c tio n s

Section  3

C ir c u it   D e s c r ip t io n

S e c tio n   4

Maintenance

S e c tio n   5

Calibration  Procedure

S e c tio n   6

Parts  List  and 

Schematics

Summary of Contents for TYPE L

Page 1: ...N Tektronix Inc S W M illikan W ay P O Box 500 Beaverton Oregon Phone Ml 4 0161 Cables Tektronix Tektronix International A G Terrassenweg 1A Zug Switzerland P H 042 49192 Cable Tekintag Zug Switzerland Telex 53 574 070 336 ...

Page 2: ...rectly to the field there fore all requests for repairs and replace ment parts should be directed to the Tek tronix Field Office or Representative in your area This procedure will assure you the fastest possible service Please include the instrument Type and Serial number with all requests for parts or service Specifications and price change priv ileges reserved Copyright 1962 by Tektronix Inc Bea...

Page 3: ...NTENTS Warranty Section 1 Characteristics S ection 2 O p eratin g Instructions Section 3 C irc u it D escrip tion Section 4 Maintenance S ection 5 Calibration Procedure Section 6 Parts List and Schematics ...

Page 4: ...CALIBRATED PREAMP 05 20 V CM A C 0 C COUPiPO PREAMP R SSriME 0 0 6 p 5EC 005 2 V CM AC COUPLED PREAMP RiSETiME 01 MS C TYPE L PLUG IN UNIT SERIAL VARIABLE VOLTS CM VERTICAL POSITION TEKTRONIX INC PORTLAND OREGON U S A ...

Page 5: ... TABLE 1 1 TRANSIENT RESPONSE AND BANDPASS Type RISETIME in nanoseconds BANDPASS L AC DC Unit switch AC or DC X10 GAIN AC DC AC X10 GAIN AC Oscilloscope Type 70 70 DC to 5MC 3cps to 5MC 3cps to 5MC 532 541 541A 543 543A 545 545A 555 12 14 DC to 30MC 3cps to 30MC 3cps to 24MC 531 531A 533 533A 535 535A 23 32 DC to 15MC 3cps to 15MC 3cps to 11MC 581 585 12 14 DC to 30MC 3cps to 30MC 3cps to 24MC 551...

Page 6: ...sly variable uncalibrated between steps and up to 5 volts per centimeter Step Attenuator VOLTS CM switch Accuracy Within 3 of front panel reading for all positions of VOLTS CM switch Input Impedance Characteristics Type L Plug In Unit 1 Megohm shunted by 20 picofarads Type P6017 Probe 10 Megohms shunted by 14 picofarads Type P6000 Probe 10 Megohms shunted by 11 5 picofarads Type P510 Probe 10 Mego...

Page 7: ...ied to them on the scopes with which the Type L Unit can be used Alternate names for the controls are given in parentheses First Time Operation To set the oscilloscope Type L Plug In Unit combination in operation for the first time the following procedure is suggested 1 Insert the Type L Unit into the plug in compartment of the oscilloscope and tighten it with the securing rod 2 Set the front pane...

Page 8: ... sensitivity to 50v cm ih AC and DC to 5 0v cm in X10 GAIN AC VERTICAL POSITION Control positions oscilloscope display vertically VARIABLE ATTEN BAL Screwdriver adjustable control bal ances main amplifier section so that use of VARIABLE control does not shift oscilloscope display GAIN ADJUST Screw driver adjustable con trol sets gain of main amplifier section of the unit X10 GAIN ADJUST Screwdrive...

Page 9: ...ust the X10 VARIABLE ATTEN BAL control until rotation of the VARIABLE control no longer affects the position of the trace Return the VARIABLE control to the CALIBRATED position fully clockwise Checking Gain Adjustment Adjustment of the vertical gain should be checked frequently Aging of tubes and other components causes a slight change in the gain characteristics of the plug in In order to make co...

Page 10: ... actual use The input circuit of the plug in may some times produce loading of the signal source At the INPUT connector of the Type L the impedance of the input circuit is equivalent to a resistance of 1 Megohm shunted with a capacitance of 20 picofarads With a few feet of shielded cable the capacitance may well be increased to 100 picofarads Where the effects of these resistive and capacitive loa...

Page 11: ...hould be consistently made from the same part of the trace the top center or bottom If the center of the trace is used for one reading it should be used for all subsequent readings Notice that points a and b in Figure 2 3 correspond to the center of the trace Measuring Peak to Peak Voltages To measure the peak to peak voltage of a particular signal the following method may be used 1 Set the AC DC ...

Page 12: ...ing used Adjust the VERTICAL POSITION control to set the trace at some convenient reference position such as b in Figure 2 4 5 Without changing the position of any controls of the instrument remove the cable from the reference voltage ground and connect it to the voltage signal source to be measured Adjust the oscilloscope triggering controls for a stable display If the amplitude of the signal is ...

Page 13: ...in the circuit The attenuators are frequency compensated voltage dividers At low frequencies the capacitors have a high impedance and their effect in the circuit is negligible the atten uators act as resistive dividers with the atten uation being proportional to the ratio of the resistances As the frequency of the input signal is increased however the impedance of the capacitors decreases and thei...

Page 14: ...t highly negative as when the tube is removed without turning off the power For proper operation of the X10 amplifier it is important that the Second Amplifier V6042 be operated on a certain portion of its character istic curve To allow for slight changes in component values and for tube differences a V6042 Cathode Current Adj control R5922 is provided in the plate circuit of V5942 The function of...

Page 15: ... the dc level on the grid of one Driver Cathode Follower while decreasing the dc level on the grid of the other Driver C F Since the following stages are dc coupled this change in dc level at the Driver C F s results in a vertical displacement of the crt beam Minimum capacitive loading to the plate circuit of the Phase Inverter Stage is assured by the two sets of cathode followers at the output th...

Page 16: ...NOTES ...

Page 17: ... of certain parts will require that portions of the instrument be calibrated for proper operation Refer to the Calibration section of this manual for the procedures required Switches If a switch is found to be defective and needs to be repaired or replaced use normal care in unsoldering and disconnecting leads from the terminals Single wafers on wafer type switches are not normally replaced If a w...

Page 18: ...onal cutters cut off the excess length of the mounting clips Soldering Precautions In the production of Tektronix instruments a special silver bearing solder is used to establish a bond to the ceramic terminal strips This bond may be broken by the repeated use of ordinary tin lead solder or by the appli cation of too much heat Occasional use of ordinary solder will not break the bond however unles...

Page 19: ...ng another plug in unit for the L Unit and checking for proper operation A schematic diagram of the L Unit is con tained in the rear portion of this manual The reference designation of each component is shown on the circuit diagram as well as important voltages These should be used as troubleshooting aids The Circuit Description may prove useful when troubleshooting within a particular circuit Swi...

Page 20: ...nverter Stage V6242 V6342 to the Output Stage V6632 a component failure anywhere between these two points can unbalance the amplifier and cause a loss of the trace A dc unbalance can be caused by defective tubes defective cathode screen or plate resistors shorted or leaky capacitors open peaking coils and incorrect ratios in the voltage dividers When the X10 amplifier is connected into the circuit...

Page 21: ... the First Amplifier V5942 or the Second Amplifier V6042 Since these stages are ac coupled to the Second C F stage an open circuit ahead of the coupling capacitor will not affect the dc balance If the trouble is originating in the main amplifier section it can be isolated to either the Phase Inverter Stage or the Output Stage with the VERTICAL POSITION control If the trace can be moved vertically ...

Page 22: ... be caused by cathode and screen bypass capacitors and by coupling capacitors Before attempting any component replacement however be sure to check the adjustment of the Lpw Freq Adj control R6182 as explained in the Calibration Procedure Over compensation of low frequencies is illustrated in Fig 4 2 b This condition is pro m a b Fig 4 2 a Low frequency distortion caused by attenuation in X10 ampli...

Page 23: ... peaking coil is often a cause of this condition Cross coupling capacitors C6672 and C6772 are also very important in maintaining the proper risetime An open condition in either capacitor will seriously affect the high frequency response The overshoot condition illustrated in Fig 4 3 b is produced by excessive high frequency peaking An improper setting of the H F Peaking control R6692 can cause th...

Page 24: ...NOTES ...

Page 25: ...the preceding step If information explaining the normal operation of front panel controls is needed before starting the procedure consult the Operating Instructions section of this manual C A L IB R A T IO N P R O C E D U R E Equipment Required The following equipment or its equivalent is required to perform a complete calibration of the Type L Plug In Unit 1 Test Oscilloscope Tektronix 540 or 550...

Page 26: ...t Adjust the FOCUS ASTIG INTENSITY HORIZONTAL DISPLAY MAGNIFIER 5X MAG Main Sweep Controls TIME CM VARIABLE TIME CM TRIGGER SLOPE TRIGGERING MODE TRIGGERING SOURCE STABILITY TRIGGERING LEVEL Type L Plug In Unit AC DC VOLTS CM VARIABLE VOLTS CM While watching the trace on the crt switch the VOLTS CM switch from 05 to 1 position Any shift in trace position should not exceed 2 mm If this limit is exc...

Page 27: ...aveform should shift down centering the display on the graticule 8 Cathode Current Adjustment 6 X10 Variable Attenuator Balance Adjustment With the AC DC switch at X10 GAIN AC and the VARIABLE ATTEN BAL control calibrated rotate the VARIABLE VOLTS CM control back and forth while watching the crt for a shift in position of the trace If the trace moves when the control is rotated adjust the X10 VARI...

Page 28: ...he INPUT connector of the L Unit and a 5X Attenuator on the Standardizer Apply a 1 kc signal with a P52 cable from a Type 105 Square Wave Generator to the Attenuator Standardizer combination on the Type L Plug In Unit Adjust the amplitude of the display to about 3 5 cm with the OUTPUT AMPLITUDE control on the Type 105 Adjust C5732 for an optimum flat top 14 Attenuator Input Capacitance and Frequen...

Page 29: ...nse Remove the Type EP54 Plug In Extension Set the TIME CM switch at 2 pSEC VOLTS CM at 05 and the AC DC switch at DC Install a 50ft Terminating Resistor on the INPUT connector of the Type L Unit Apply a square wave of approximately 450 kc from a Tektronix Type 107 Square Wave Generator to the T e r minating Resistor on the Type L Adjust the display amplitude with the APPROXIMATE AMPLITUDE control...

Page 30: ...he ATTENUATOR switch of the Type 190 for exactly three centimeters of vertical deflection Without changing any other controls increase the output frequency of the Type 190 until the vertical deflection is reduced to exactly 2 1 cm This is the 3 db down point and should occur at approximately 30 megacycles Install a 10X Attenuator between the Attenuator head of the Type 190 and the Terminating Resi...

Page 31: ... 1 2 f Farad PTB Paper Bathtub G Giga or 109 PMC Paper metal cased GMV Guaranteed minmum value Poly Polystyrene h Henry Prec Precision K or k Kilohms or kilo 103 PT Paper Tubular M Cer Mica or Ceramic T Terra or 101 2 M or meg Megohms or mega 106 V Working volts DC p Micro or 10 6 Var Variable fX J Micromicro or 1O 1 2 w Watt m milli or 10 3 W W Wire wound 6 1 ...

Page 32: ...to give you the benefit of the latest circuit im provements developed in our engineering department It is therefore important when ordering parts for your order to contain the following information Part number including any suffix instrument type serial number and modification number if applicable If a part you have ordered has been replaced with a new or improved part your local Field Office will...

Page 33: ...x xf Tub Var C5282t C5292 281 027 7 3 x xf Tub Var C5312 281 519 47 x xf Cer Var 500 v 10 C5342 281 027 7 3 x xf Tub Var C5352t C5362 281 027 7 3 yx xf Tub Var C5382 281 530 100 x xf Cer 500 v 10 C5412 281 027 7 3 x xf Tub Var C5422t C5432 281 027 7 3 yx xf Tub Var C5452 283 539 250 x xf Mica 500 v 10 C5502 281 027 7 3 x xf Tub Var C5512 t C5522 281 027 7 3 x xf Tub Var C5542 283 541 500 x xf Mica...

Page 34: ... 283 002 01 if Discap 500 v Inductors L5902 Use 114 043 5 1 ih Var core 276 506 L5932 108 209 75 ih X6570 10990X L5942 114 085 2 2 7 ih Var core 276 506 L6012 114 072 4 7 5 ih Var core 276 506 L6112 108 126 1 6 ih L6282 108 006 13 ih L6292A B 108 097 Plate Peaking network 4 section L6302 108 062 45 ih X5999 10990X L6312 108 062 45 ih X5999 10990X L6632 108 062 45 ih L6672 108 112 3 ih L6732 108 06...

Page 35: ... Prec 1 R5652 302 100 ion y2w R5722 302 105 1 meg y2w 101 1553 302 104 100 k y2w 1554 up R5732 309 148 1 meg y2w Prec 1 R5802 302 683 68 k y2w R5812 302 470 47 0 y2w R5822 302 470 47 0 y2w R5832 302 470 47 0 y2w R5862 306 223 22 k 2 w R5872 302 470 47 0 y2w R5902 303 333 33 k y2w 5 R5912 302 105 1 meg y2w X221 up R5922 311 015 10k 2 w Var WW V6042 Cathode Current Adi R5932 308 054 10k 5 w WW 5 R59...

Page 36: ...515 500 0 y2 w Mica Plate 2 10991 up 310 515 500 0 y2 w Mica Plate 2 101 5998 309 179 500 0 y2 w Prec 1 5999 10990 310 515 500 0 y2 w Mica Plate 2 10991 up 302 270 27 0 y2 w Use 050 037 Var W W 101 1059 311 298 680 0 VARIABLE 1060 up 304 152 1 5 k 1 w 304 152 1 5 k 1 w 308 092 4 5 k 5 w W W 5 311 012 5k 2 w Var W W Gain Adjust 306 562 5 6 k 2 w 302 103 10k y2 w 302 104 100 k y2 w 311 028 2 x 100 k...

Page 37: ...262 133 Rotary S N Range AC DC X I0 Gain Volts CM Electron Tubes V5832 154 084 56541 V5942 154 084 56541 V6042 154 084 56541 V6132 154 084 56541 V6242 1 157 038 12AU6 V63421 157 038 12AU6 V6632 154 039 12AT7 V6732 154 039 12AT7 t 6AK5 may be substituted for 5654 Tek number 154 014 1 Selected pair Furnished as a unit 6 7 ...

Page 38: ... STRIP 3 4 x 7 notches clip mounted 124 089 CERAMIC STRIP 3 4 x 11 notches clip mounted 124 091 CHASSIS 441 146 CLAMP CABLE 7 16 plastic 343 005 CLAMP CABLE steel V2 ID mtg right angle to circle 343 015 CLAMP CABLE steel 2 x 343 036 CONNECTOR CHASSIS MT 16 contact male 131 017 CONNECTOR CHASSIS MT UHF teflon center 131 051 GROMMET RUBBER V4 348 002 GROMMET RUBBER 3 8 348 004 KNOB LARGE BLACK 1 225...

Page 39: ...X y 8 3 2 x V 2 x 16 210 494 PANEL FRONT 333 517 PLATE PLEXIGLASS l 2s 32 x 2 y u 386 593 PLATE PLEXIGLASS 2 x2 4 386 594 REAR ALUM FRAME PLATE 387 529 RING STEEL FREE ID x 180 354 025 RING POLY y2 ID x 9 i 6O D x A 354 068 ROD ALUM y4 x 2 y 16 384 177 ROD FRAME 3 a x 87 s tapped 8 32 384 508 ROD SECURING 3 16x l0 y 2 384 510 ROD NYLON 5 u x 1 tapped 6 32 385 018 SCREW 4 40 x y l6 BHS 211 011 SCRE...

Page 40: ...OCKET STM7 shielded 136 009 SOCKET 7 pin w o center pin 136 010 SOCKET STM9 136 014 SPACER 5 32 nylon for Ceramic Strip 361 007 SPACER ALUM 125 ID x 3 u OD x 166 025 SPACER ALUM 384 ID x A OD x 9 32 166 131 SPADE BOLT 6 32 x 214 012 STRIP COPPER y8 x 2 124 073 SUBPANEL 386 592 TUBING 20 black plastic 162 504 WASHER 6L x x 032 210 803 WASHER 1OS x 7 u x 036 210 805 WASHER Fiber 10 210 812 WASHER St...

Page 41: ...652 R5722 R5092 C 5092 R5052 r K 7 99 R5292 R5222 R5162 C5172 R5042 C 5042 R I G H TS I D E V O L T S C MS W I T C H L E F TS I D E V O L T S C MS W I T C H R5372 R5362 R5002 R5652 R5552 R5462 R5732 R5722 C 5722 ...

Page 42: ... 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...

Page 43: ...uit and component improvements to our instruments as soon as they are developed and tested Sometimes due to printing and shipping require ments we can t get these changes immediately into printed manuals Hence your manual may contain new change information on following pages If it does not your manual is correct as printed ...

Page 44: ......

Page 45: ... in with a small pocket screwdriver The screwdriver will have to be removed each time the waveform is checked since the metal blade introduces distortion 14 Attenuator Input Capacitance and Frequency Compensation Adjust ments Trimmer capacitors are provided for standardizing the input cap acitance and compensating the voltage dividers at each step of the VOLTS CM switch This is done so the plug in...

Page 46: ... n n j n j ni n u i n _i _j n n J 1 ü n uJ n u n j ...

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