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Tektronix 502A, Instruction Manual

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Tektronix 502A Instruction Manual Download Page 57

SECTION

 6

PARTS LIST

 AND 

SCHEMATICS

PARTS ORDERING

 

INFORMATION

Replacement 

parts

 are available from or through your local Tektronix Field Office.

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 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 Tektronix

 Field Office will contact

 you concerning any change in part number.

ABBREVIATIONS AND 

SYMBOLS

a

 or amp

amperes

mm

millimeter

BHS

binding head

 steel

meg

 or M

megohms

 or mega (106)

C

carbon

met.

metal

cer

ceramic

μ

micro,

 or 10-6

cm

centimeter

n

nano, 

or

 10 ’

comp

composition

Ω

ohm

cps

cycles

 per second

OD

outside

 diameter

crt

cathode-ray

 tube

OHS

oval

 head

 steel

CSK

counter sunk

P

pico,

 or

 10-12

dia

diameter

PHS

pan head

 steel

div

division

piv

peak inverse

 voltage

EMC

electrolytic, metal

 cased

p

l

stc

plastic

EMT

electroyltic, metal 

tubular

PMC

paper, metal

 cased

ext

external

poly

polystyrene

f

farad

Prec

precision

F

 & I

focus

 and intensity

PT

paper

 tubular

FHS

flat

 

head steel

PTM

paper

 or

 plastic, tubular, molded

F

il

 HS

fillister

 head

 steel

RHS

round

 head

 steel

g

 or G

giga,

 or

 10’

rms

root

 mean square

Ge

germanium

sec

second

GM

V

guaranteed

 

minimum value

Si

silicon

h

henry

S/N

serial

 number

hex

hexagonal

t

 or

 T

tera,

 or

 1012

HHS

hex

 head steel

TD

toroid

HSS

hex

 socket steel

THS

truss

 head steel

HV

high 

voltage

tub.

tubular

ID

inside

 diameter

v

 or V

volt

incd

incandescent

Var

variable

int

internal

w

watt

k 

or

 K

kilohms

 or

 kilo (103)

w/

with

kc

kilocycle

w/o

without

m

milli,

 or 103

WW

wire-wound

mc

megacycle

SPECIAL

 

NOTES

 AND

 SYMBOLS

X000 

Part

 first added at

 this serial number.

000X 

Part 

removed

 after this serial number.

*000-000

 Asterisk

 preceding Tektronix Part Number indicates manufactured

 by or for Tektronix, 

or 

reworked or

 checked

 components.

Use 

000-000

Part

 number indicated is

 direct replacement.

Internal screwdriver

 adjustment.

Front-panel

 adjustment

 or connector.

6-1

Summary of Contents for 502A

Page 1: ...INSTRUCTION MANUAL Serial Number__________ Tektronix Inc S W Millikan Way P O Box 500 Beaverton Oregon Phone Ml 4 0161 Cables Tektronix 463 070 382 ...

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 1963 by Tektronix Inc Bea...

Page 3: ...CONTENTS Section 1 Characteristics Section 2 Operating Instructions Section 3 Circuit Description Section 4 Maintenance Section 5 Calibration Procedure Section 6 Parts List and Schematic Diagrams ...

Page 4: ......

Page 5: ...o ground for settings of the SENSITIVITY con trol from 0 1 mv cm to 2 v cm or 20 volts with respect to ground for settings from 5 v cm to 2 v cm and or 200 volts with respect to ground for settings from 5 v cm to 20 v cm For ac coupling the signal limits are 2 volts peak to peak from 0 1 mv cm to 2 v cm 20 volts peak to peak from 5 v cm to 2 v cm and 200 volts peak to peak from 5 v cm to 20 v cm T...

Page 6: ...overs a minimum of 8 cm of vertical scan Voltage calibrator Square wave output at approximately 1 kc Six calibrated voltage steps from 0 5 mv to 50 volts peak to peak Accuracy within 3 Graticule Edge lighted marked in 10 vertical and 10 horizontal 1 cm divisions with 2 mm markings on the baselines Power requirements Line voltage 105 to 125 volts or 210 to 250 volts 50 60 cycles Power Approximately...

Page 7: ...reason SECTION 2 OPERATING INSTRUCTIONS a thermal cutout switch will disconnect the power and keep it disconnected until the temperature drops to a sofe value For proper air circulation the bottom and side panels must be in ploce Be sure the bottom panel is installed ac cording to directions Power Requirements The regulated power supplies in the Type 502A will operate with line voltages from 105 t...

Page 8: ...se for 50 cycles use a 1 6 amp 3AG Slo Blo fuse Input Selection On the Type 502A oscilloscope you can connect single ended inputs to either the A or B input connectors of the LOWER or UPPER BEAM amplifiers by rotating the Input Selector switches to the corresponding position The choice of input connections will depend upon the display desired Waveforms applied to input B are displayed in an invert...

Page 9: ...e low signal level and high amplifier gain 2 As nearly as possible simulate actual operating condi tions in the equipment being tested The equipment should have a load on it which is approximately equal to the load encountered in normal operation 3 Consider the effect of loading upon the signal source due to the input circuit of the oscilloscope The circuit at the input connectors can be represent...

Page 10: ... time relationship to each other it is possible to trigger from either beam and obtain simultaneously a stable display of both waveforms The following instructions tell you how to select the proper triggering signal for various applications of your oscilloscope These instructions also provide information about the advantages and limitations of each triggering con figuration You should attempt to b...

Page 11: ...e to eliminate this effect you can use ac coupling provided the triggering signal is otherwise suitable for this type of coupling With dc coupling the dc level of external triggering signals will also affect the triggering point Generally when the triggering signal is small compared to its dc level ac coup ling should be used AC Coupling AC coupling is selected in the LINE LOWER AC UPPER AC and EX...

Page 12: ...ELECTOR Sweep Triggers On Slope TRIGGER SELECTOR Sweep Triggers On Slope TRIGGER SELECTOR Sweep Triggers On Slope When the TRIGGERING LEVEL control is set in the lower region the sweep is triggered on a lower portion of the waveform when it is set in the higher region the sweep is triggered on a higher portion of the waveform The TRIGGER SELECTOR switch determines whether the sweep is triggered on...

Page 13: ... horizontal and vertical deflection factors are desirable the UPPER BEAM amplifier can be switched to the crt horizontal deflec tion plates by placing the HORIZ DEF PLATE SELECTOR switch at the UPPER BEAM AMP position This type of opera tion provides 1 mVOLTS PER CM to 20 VOLTS PER CM sen sitivity and differential input for both horizontal and vertical deflection The LOWER BEAM is used for vertica...

Page 14: ...nstantaneous voltages is very similar to the method described previously for ac com ponent voltage measurements A reference line must be es tablished on the crt screen The actual voltage measurement is taken with respect to this reference line If for example the voltage measurement is to be made with respect to 100 volts the reference line would correspond to 100 volts In the following procedure t...

Page 15: ...IME CM Control is in the CALIBRATED position The method for measuring a time interval is as follows 1 Using the graticule measure the horizontal distance in centimeters between two points whose time interval you wish to find 2 Multiply the distance measured by the setting of the TIME CM control to obtain the apparent time interval 3 Divide the apparent time interval by the magnification indicated ...

Page 16: ... each will have the same relative writing rate hence each trace will show the same amount on a photograph It may be necessary to readjust the INTENSITY BALANCE Control each time the setting of the INTENSITY Control is changed This is due to the characteristics of a mono accelerator crt in which the triode characteristics for each crt gun are slightly different AUXILIARY FUNCTION AMPLITUDE CALIBRAT...

Page 17: ...mplifier are removed and a resistor is con nected between each lead and its respective crt pin A good value for this resistor in most cases is 1 megohm The vertical deflection plate pins are located on the sides of the crt neck and the horizontal deflection plate pins are located on the top of the neck A convenient method for connecting the resistors to the crt pins is to use clips removed from st...

Page 18: ...OR Controls amplitude of the calibrator square waves at the CAL OUT connector TRIGGERING LEVEL Selects the voltage point on the triggering wave form where the sweep is triggered Also se lects AUTOMATIC or RECURRENT operation MODE Provides means of obtaining single sweep of display across the face of the crt FINDER Reduces verti cal amplifier gain by 100 times to enable the trace to appear on the c...

Page 19: ...y of the Vertical Amplifier as mentioned previously is 100 microvolts per centimeter However by means of attenuation and degeneration networks the vertical deflection factor can be increased to 20 volts per centimeter It is possible through the use of the VARIABLE SENSITIVITY Control to introduce enough cathode degeneration into the cathodes of the Output Stage to increase the deflection factor to...

Page 20: ...Circuit Description Type 502A Fig 3 1 Simplified Upper and Lower Beam Vertical Amplifiers S W 4 6 9 ______ HORIZ DEF P L A T E SELECTOR 3 2 ...

Page 21: ...lue of R408 is determined by the degree to which R408A is shunted The greater the shunting of R408A the smaller the value of R408 and the greater the gain of the Input Amplifier stage Conversely the less the shunting of R408A the greater the values of R408 and the smaller the gain of the stage The cathodes of the Input Amplifier stage are long tailed to the 150 volt supply through 82 5K resistors ...

Page 22: ...Circuit Description Type 502A Fig 3 2 Simplified Sweep Trigger Circuit t i CO ...

Page 23: ...ith the beam positioned at its respective zero center graticule line TIME BASE TRIGGER The Time Base Trigger circuit consists of a triggering signal amplifier V24 and a multivibrator Schmitt Trigger circuit V45 The function of the trigger circuitry is to pro duce a negative going rectangular pulse at the plate of V45A whose repetition rate is the same as that of the trig gering signal This negativ...

Page 24: ...6IB IOOV VI45A NORMAL X I TIME BASE AMP TIME BASE TRIG DIAG UPPER BEAM AMP IOO V O n SWEEP MAG POSITIONS J sawtooth to horiz amp Fig 3 3 Simplified Sweep Generator Circuit Description Type 502A 150 V I5OV I5OV I50V sO l co 35OV ...

Page 25: ...e of V45B starts to rise carrying with it the voltage at the grid of V45A Since the two grids are coupled through R32 this causes the voltage at the grid of V45B to start rising The time constant of the R32 C31 network is such that it takes about 01 second for the voltage at the grid of V45B to rise exponentially from its starting point below cutoff to a point where plate current can start As V45B...

Page 26: ...rt beam returns rapidly to its start ing point The Hold Off Circuit prevents the Time Base Generator from being triggered during the retrace interval In addition the Hold Off allows a finite time for the Time Base circuits to regain a state of equilibrium after the completion of a sweep During the trace portion of the sweep sawtooth the Hold Off Capacitor C180 charges through V183A as a result of ...

Page 27: ...Circuit Description Type 502A Fig 3 4 Simplified Horizontal Amplifier 3 9 ...

Page 28: ...50V 4 485V UNREG TO CRT CRT 100V TO LOWER BEAM VERT AMP 350V TO UPPER BEAM VERT AMP 350V 150V TO LOWER BEAM VERT AMP Fig 3 5 Simplified Low Voltage Power Supply 350V TO LOWER BEAM VERT AMR D642A R662 100V V666A 150V ADJ R623 C623 100V 150V TO UPPER BEAM VERT AMP 150V 6 2V TO V414 V444 HTRS HTR WRG DIAG 3 10 T602 29 ...

Page 29: ...ircuit on the other The Input Amplifier is a cathode coupled paraphase amplifier and converts the positive going sawtooth voltage obtained from the Time Base Generator to a push pull output sawtooth voltage The gain of the Input Amplifier is determined by the amount of resistance connected between the two cathodes which in turn determines the degree of negative feedback applied to the stage In the...

Page 30: ...Circuit Description Type 502A 3 12 NORMALLY CLOSED LOCATED ON REAR PANEL Fig 3 6 Simplified CRT Circuit ...

Page 31: ... for the 350 volt regulator As mentioned previously the 350 volt supply also furnishes an unregulated output of about 485 volts for the crt high voltage supply The 6 2 volt supply works in essentially the same manner as the vacuum tube supplies The divider R648 R649 estab lishes a reference voltage at the base of Q644 If we now assume that the output tends to go more negative the emitter of Q644 w...

Page 32: ...Circuit Description Type 5O2A Fig 3 7 Simplified Calibrator Circuit 3 14 ...

Page 33: ...lances one grid voltage against the other so that the INTENSITY Control will have an equal effect on both beams AMPLITUDE CALIBRATOR The AMPLITUDE CALIBRATOR is a square wave gen erator whose approximately 1 Kc output is available at a front panel connector labeled CAL OUT It consists of a Multivibrator V873A V875 connected so as to switch the cathode follower V873B between two operating states cu...

Page 34: ...NOTES ...

Page 35: ... or resistors missing tube shields or broken terminal strips For most visual troubles the remedy is apparent however particular care must be taken when heat damaged com ponents are detected Overheating of parts is often the result of other less apparent defects in the circuit It is essential that you determine the cause of overheating before replacing heat damaged parts in order to prevent further...

Page 36: ...re so that a slight fillet will be formed Fig 4 4 Soldering to a terminal Note the slight fillet of solder exaggerated for clarity formed around the wire General Soldering Considerations When replacing wires in terminal slots clip the ends neatly as close to the solder joint as possible In clipping the ends of wires take care the end removed does not fly across the room as it is clipped Fig 4 5 A ...

Page 37: ...damaged components are apparent and if tube replacement does not restore operation it will be necessary to make measurements or other checks within the circuit to locate the trouble The component number of each resistor inductor capac itor vacuum tube control and switch is shown on the circuit diagrams The following chart lists the component numbers associated with each circuit All numbers less th...

Page 38: ...oper voltages first check the line voltage The supplies are designed to regulate between 105 and 125 volts or 210 and 250 volts with the design center at 117 volts or 234 volts rms There are similar line voltage ranges for the other nominal line voltages Improper line voltage may cause one or all of the supply voltages to be off All the low voltage power supplies are dependent upon the 150 volt su...

Page 39: ...w It is unlikely that all three rectifier tubes would simultaneously be defective If the neon bulb does not glow the oscillator is not operating If replacement of the oscillator tube V800 and the regulator tube V814 does not clear up the trouble check Fig 4 9 Checking operation of the high voltage oscillator circuit by means of a neon bulb the components of the oscillator circuit including the pri...

Page 40: ...s more pronounced or if there is no vertical deflection at all the tubes should be checked first Then check for components which will affect the gain of both sides of the amplifier without unbalancing the am plifier Such parts are common cathode resistors in the amplifier stages or plate dropping resistors which are com mon to both sides of the amplifier Insufficient vertical deflection will also ...

Page 41: ... pin 6 of V24B The voltage should vary between approximately 34 and 135 volts An incorrect voltage range indicates a defective trigger input amplifier or TRIGGERING LEVEL Control If the voltage range is correct the trouble will be in the trigger multivibrator A trouble in the multivibrator will probably be due to defective re sistors The voltage divider network between the plate of V45A and the gr...

Page 42: ...the cathode circuit of V161B should be checked Single Sweep will not perform properly If D126 opens the Time Base Generator will still operate normally when the MODE switch is in the NORMAL position However when the instrument is set up for Single Sweep operation the circuit will not lockout at the end of the sweep This of course means that each incoming trigger will produce another sweep across t...

Page 43: ...e instrument must be calibrated If you find that a circuit is out of calibration but you are not aware of which particular adjustment will correct the difficulty it is usually best to calibrate the entire circuit Equipment Required The following equipment or its equivalent is necessary for a complete calibration of the Type 502A Oscilloscope 1 DC voltmeter sensitivity of at least 5000 ohms per vol...

Page 44: ...heck the input voltage to the instru ment and adjust the autotransformer as necessary to main tain the voltage at 117 or 234 volts except when the power supply regulation is being checked CAUTION Do not reset the 150 control unless the power supply voltages are actually out of tolerance or you are planning to perform a complete calibra tion of the instrument Preset the front panel controls of the ...

Page 45: ...f R833 HORIZ SENS BAL Adjust R833 until a reading of 100 volts is obtained from the center arm to ground Now connect the voltmeter from the H V TEST POINT to ground Adjust the HV Control for a reading of 2900 volts Replace HV shield To check HV regulation place the HORIZONTAL DISPLAY switch to 2 EXT VOLTS CM Position the focused spots onto the screen Now while observing the focused spot decrease t...

Page 46: ...just the CRT HORIZ SENS BAL until the sensitivity of the two beams is the same At this point in the calibration the two beams are being matched to each other and the time markers may not coincide with the graticule marks NOTE Every time the CRT HORIZ SENS BAL is adjusted the INT BAL must be checked The HORIZ BEAM REGIS may also have to be readjusted at this time The above three controls interact w...

Page 47: ...n the holdoff waveform This is just a preliminary adjustment of C311 Adjustment of the faster sweep rates is indicated in the chart below The 1 μSEC and the 5 μSEC timing adjustments will interact and therefore will have to be rechecked several times Apply time markers to both A inputs and trigger the display Disconnect Time Markers TIME CM TIME MARKERS FROM TYPE 180A ADJUST OR CHECK 10 μSEC 10 MI...

Page 48: ... centerline Adjust the 2 V CM DIFF BAL Control for minimum vertical deflection A DC position and the SENSITIVITY switch in the 2 VOLTS PER CM position Set the 2V CM GAIN for 2 5 centimeters of vertical deflection 17 2MV CM DIFF BAL Place the SENSITIVITY switch in the 2 mVOLTS PER CM position and position the trace so that it lies behind the appropriate horizontal centerline Adjust the 2MV CM DIFF ...

Page 49: ...t Selector to A DC and connect the cable and termination to the A input Line up the top of the square wave with the proper graticule center line and adjust C469 C469 is adjusted for an optimum square top on the square wave It will be necessary to recheck the adjustment of C470 C480 C478 and C469 as the adjustment of one of these capacitors may affect the adjustment of the others R462 C469 Fig 5 9 ...

Page 50: ...FF DC The vertical line may be used to determine the amplitude of the input signal Once the proper amplitude has been determined turn the UPPER BEAM Input Selector switch to A DC Check to see that the eye opening of the lissajous waveform is about the same as that listed below The eye opening measurement of the lissajous waveform should be made near the center of the crt screen NOTE When placing a...

Page 51: ... the proper beam the TIME CM to 5 mSEC and the TRIGGERING LEVEL to trigger the signal Adjust C410 for an undistorted square wave Place the SENSITIVITY switch in the 2 VOLTS PER CM position and adjust the Type 105 output for approximately 3 cm of vertical deflection Adjust C406A and C406C for an undistorted square wave Place the SENSITIVITY switch in the 5 VOLTS PER CM position and adjust the Type ...

Page 52: ...e junction of R15 and C13 is grounded as shown 31 STABILITY ADJUST Disconnect the Calibrator signal remove the jumper from the junction of R15 and C13 to ground place the TRIGGERING LEVEL Control in the AUTOMATIC position and set the TIME CM control to 1mSEC Connect a meter from the wiper arm of the STABILITY ADJUST Potentiometer to ground Rotate the STABILITY ADJUST Control clockwise from the ful...

Page 53: ... 34 SWP LENGTH Place the TIME CM switch in the 1mSEC position and the TRIGGERING LEVEL Control in RECURRENT position Adjust the SWP LENGTH control for a total sweep length of 10 6 centimeters 35 Single Sweep Check Reset the following controls TRIGGER SELECTOR MODE TIME CM HORIZONTAL DISPLAY Input Selector of beam being used SENSITIVITY of beam being used AMPLITUDE CALIBRATOR To trigger AC off the ...

Page 54: ... LOWER GEOM C311 ASTIG UPPER NORM MAG X20 CAL REGIS Fig 5 14 Top view Type 502A DC TRIG HORIZ DEF PLATE SELECTOR SWITCH FEEDBACK BAL 2 MV CM GAIN DC BAL DC BAL 2 MV CM DIFF BAL 150 C480 C469 HORIZ BEAM REGIS CRT Alignment Clamp GAIN ADJ FOR HORIZ MODE Fig 5 15 Left side view Type 502A 5 12 i ...

Page 55: ...rocedure Type 502A F 9 view Type 502A C406G FEEDBACK BAL 2MV CM GAIN C406C C406A C440 C410 2MV CM DIFF BAL C470 C406J DC TRIG R429 C407A C407C C407G C469 2V CM GAIN 2V CM DIFF BAL Fig 5 17 Bottom view Type 502A 5 13 ...

Page 56: ...NOTES ...

Page 57: ...CSK counter sunk P pico or 10 12 dia diameter PHS pan head steel div division piv peak inverse voltage EMC electrolytic metal cased plstc plastic EMT electroyltic metal tubular PMC paper metal cased ext external poly polystyrene f farad Prec precision F I focus and intensity PT paper tubular FHS flat head steel PTM paper or plastic tubular molded Fil HS fillister head steel RHS round head steel g ...

Page 58: ... anodized 210 013 1 LOCKWASHER steel internal 3 8 x 11 16 in 210 494 1 NUT hex alum 3 8 32 x 1 2 x 11 16 in 210 012 1 LOCKWASHER steel pot internal 3 8 x 1 2 in 210 207 1 LUG solder pot plain 3 8 in 3 129 063 2 POST binding 5 way charcoal 358 169 2 BUSHING binding post charcoal 210 010 2 LOCKWASHER steel internal 10 210 206 2 LUG solder SE10 long 210 445 4 NUT hex steel 10 32 x 3 8 in 6 2 ...

Page 59: ...dware not included 210 206 1 LUG solder SE10 long 210 445 1 NUT hex steel 10 32 x in 11 131 064 5 CONNECTOR chassis mount coaxial 406 244 5 BRACKET nylon molded 160 x 3 4 x 1 3 4 in 211 025 10 SCREW 4 40 x in FHS 210 812 10 WASHER fiber 10 210 004 10 LOCKWASHER steel internal 4 210 224 5 LUG solder 10 non locking 7 8 in long 210 406 10 NUT hex brass 4 40 x 3 I6 in 12 366 144 2 KNOB charcoal 366 03...

Page 60: ...Parts List Type 502A LEFT SIDE 6 4 ...

Page 61: ...2 CLAMP cable in plastic 211 510 1 SCREW 6 32 x in BHS 211 511 1 SCREW 6 32 x A in BHS 210 803 2 WASHER steel 6L x in 210 457 2 NUT keps steel 6 32 x 5 14 in 8 366 068 1 KNOB small black 9 344 047 5 CLIP deflection plate poly 10 348 002 1 GROMMET rubber 4 in 11 406 635 1 BRACKET low capacity pot mounting delrin A in 213 035 2 SCREW thread cutting 4 40 x y4 in PHS phillips 210 438 2 NUT hex brass l...

Page 62: ...n Pan HS with lockwasher 210 004 2 LOCKWASHER steel internal 4 210 406 2 NUT hex brass 4 40 x 3 8 in 25 406 925 1 BRACKET switch alum 1 x 2 7 8 x 3 in 211 510 3 SCREW 6 32 x 3 s in BHS 210 803 3 WASHER steel 6L x 3 8 in 210 457 3 NUT keps steel 6 32 x s 14 in 26 124 100 1 STRIP ceramic 3 4 in x 1 notch clip mounted 361 007 1 SPACER nylon molded 27 124 089 1 STRIP ceramic 3 4 in x7 notches clip mou...

Page 63: ...ER steel internal 8 NUT hex brass 8 32 x 5 16 in MOTOR 115 V AC 1567 shaft 1 in long MOTOR 115 V AC 1567 shaft 1 in long TUBE spacing alum 196 ID x 5 16 ODx t in long TUBE spacing alum 196 ID x 5 16 OD x in long LOCKWASHER steel internal 8 NUT hex brass 8 32x5 6 in SCREW 8 32 x 1 y2 in RHS FAN alum 5 2 in blade clock rotation 4 in bore FAN alum 5 2 in blade clock rotation 4 in bore SPOOL solder as...

Page 64: ...Parts List Type 502A RIGHT SIDE 6 8 ...

Page 65: ... 6 32 x in BHS 210 803 4 WASHER steel 6L x 3 8 in 210 457 4 NUT keps steel 6 32 x 5 16 in 6 343 004 1 CLAMP cable 5 16 in plastic 211 511 1 SCREW 6 32 x y2 in BHS 210 803 1 WASHER steel 6L x in 210 457 1 NUT keps steel 6 32 x 5 16 in 7 210 413 2 NUT hex brass 3 8 32 x 2 in 210 840 2 WASHER steel 390 ID x 6 in OD 210 012 1 LOCKWASHER steel pot internal x 2 in 210 207 1 LUG solder pot plain 3 8 in 8...

Page 66: ...Position and Balance 24 262 555 1 SWITCH SENSITIVITY wired Includes 406 401 1 BRACKET front 406 402 1 BRACKET rear 214 153 8 FASTENER snap double prong delrin 384 271 1 ROD shaft 8 in dia x 9 5 s in long 376 014 1 COUPLING pot wire steel 041 in dia 385 111 2 ROD nylon 4 x in tapped 5 40 in thru Mounting Hardware not included 211 507 2 SCREW 6 32 x 5 16 in BHS 210 803 4 WASHER steel 6L x in 25 384 ...

Page 67: ...Parts List Type 502A TOP 6 11 ...

Page 68: ...IS F 1 alum 6 x 5 1 16 x 5 3 e in 212 040 3 SCREW 8 32 x3 8 in 100 FHS 212 008 2 SCREW 8 32 x 2 in BHS 210 458 5 NUT keps steel 8 32xn 32 in 211 504 2 SCREW 6 32 x in BHS 210 803 2 WASHER steel 6Lx3 e in 8 210 413 1 NUT hex brass 3 e 32 x y2 in 210 207 1 LUG solder pot plain 3 8 in 210 012 1 LOCKWASHER steel pot internal 3 e x 2 in 9 348 012 1 GROMMET rubber in 10 348 002 2 GROMMET rubber 4 in 11 ...

Page 69: ...d 22 136 015 8 SOCKET 213 044 16 SCREW thread cutting 5 32 x 3 l6 in Pan H steel phillips 23 348 031 1 GROMMET snap in polypropylene y4 in dia 24 179 778 1 CABLE harness sweep 25 124 088 2 STRIP ceramic 3 4 in x4 notches clip mounted 361 009 4 SPACER nylon molded 26 262 178 1 SWITCH TRIGGER LEVEL wired Includes 210 413 2 NUT hex brass 3 s 32 x y2 in 210 012 1 LOCKWASHER steel pot internal x 2 in 3...

Page 70: ...Parts List Type 502A BOTTOM 6 14 ...

Page 71: ... in 10 124 091 8 STRIP ceramic 3 4 in xll notches clip mounted 361 009 16 SPACER nylon molded 11 136 008 2 SOCKET 213 044 4 SCREW thread cutting 5 32 x 3 6 in Pan H steel 12 386 253 2 PLATE metal small capacitor mounting 211 534 4 SCREW 6 32 x 5 l6 in PHS with lockwasher 210 006 4 LOCKWASHER steel internal 6 210 407 4 NUT hex brass 6 32 x 4 in 13 386 255 1 PLATE metal large capacitor mounting 211 ...

Page 72: ...1 007 4 SPACER nylon molded 29 406 927 1 BRACKET Sensitivity switch shield alum 211 510 2 SCREW 6 32 x in BHS 211 522 2 SCREW 6 32 x in FHS 210 803 6 WASHER steel 6L x in 210 457 4 NUT keps steel 6 32x5 16 in 30 441 494 1 CHASSIS V A alum x 2 x 2 x 6 16 in 348 039 4 SHOCKMOUNT assembly 406 399 4 BRACKET shockmount steel 2 x 875 x 531 in 210 407 4 NUT hex 6 32 x 4 in 210 006 4 LOCKWASHER steel inte...

Page 73: ...Parts List Type 502A REAR 6 17 ...

Page 74: ...16 in 5 378 022 1 FILTER air Scott foam charcoal 3 4 x 8 4 x 8 4 in 378 763 1 FILTER screen alum 6 2 x 6 2 x 3 16 in 6 334 679 1 TAG metal serial number insert 213 088 2 SCREW thread forming 4 x y4 in PHS phillips 7 352 010 1 HOLDER fuse 3AG 210 873 1 WASHER rubber 2 ID x 4 OD x 3 64 in 200 015 1 CAP fuse 3AG raw 8 131 102 1 CONNECTOR chassis mount 3 wire male Consisting of 129 041 1 POST ground s...

Page 75: ... STOP steel 2 387 056 1 PLATE cabinet side right textured blue vinyl Includes 214 057 2 FASTENER latch assembly Consisting of each 210 480 1 NUT nylon large with insert 213 033 1 SCREW steel 2 x 2 x 8 32 in 210 847 1 WASHER nylon 164 ID x 500 in OD 105 007 1 STOP steel 3 387 057 1 PLATE cabinet bottom textured blue vinyl Includes 214 057 4 FASTENER latch assembly Consisting of each 210 480 1 NUT n...

Page 76: ...ION EFF DISC 1 378 539 1 FILTER polarized light 5 16 x 5 n i in 2 012 031 1 CORD patch banana plug both ends 18 in red 3 103 013 1 ADAPTER power cord 3 wire to 2 wire 4 010 125 2 PROBES P6006 42 in 5 013 004 2 ADAPTER binding post 6 161 010 1 CORD power 16 gauge 8 ft 3 wire 6 20 ...

Page 77: ...0 V 10 50 C10 283 002 01 μf Disc Type 500 v C11 283 000 001 μf Disc Type 500 v C1 3 283 001 005 μf Disc Type 500 v C24 283 000 001 μf Disc Type 500 v C31 285 510 01 μf MT 400 v C44 281 510 22 pf Cer 500 v C131 281 510 22 pf Cer 500 v C137 281 503 8 pf Cer 500v 5 pf C141 281 541 6 8 pf Cer 500 v 10 C160A 281 007 3 12 pf Cer Var C160B 283 534 82 pf Mica 500 v 5 C160C 281 010 4 5 25 pf Cer Var C160D ...

Page 78: ...09G 283 522 470 pf Mica 500 v 10 C409H 283 524 750 pf Mica 500 v 5 C409 l 283 035 0015 μf Disc Type 500 v C409K 285 510 01 μf MT 400 v C409L 285 519 047 μf MT 400 v C410 281 010 4 5 25 pf Cer Var C440 281 010 4 5 25 pf Cer Var C456t 285 543 0022 μf MT 400 v C469 281 027 7 3 pf Tub Var C470 281 005 1 5 7 pf Cer Var C478 281 005 1 5 7 pf Cer Var C480 281 005 1 5 7 pf Cer Var C491 281 534 3 3 pf Cer ...

Page 79: ...f Disc Type 4000 v C868 use 283 082 01 μf Disc Type 4000 v C869 use 283 082 01 μf Disc Type 4000 v C871 283 518 330 pf Mica 500 v C876 283 518 330 pf Mica 500 v 10 10 10 Diodes S N Range D124 152 061 Silicon Tek Spec 20000 22539 D124 152 107 Silicon Replaceable by 1N647 22540 up D126 152 061 Silicon Tek Spec 20000 22539 D126 152 107 Silicon Replaceable by 1N647 22540 up D131 152 008 Germanium T12G...

Page 80: ...3 302 183 18k W R124 302 683 68 k W R125 use 302 154 150 k W R126 302 334 330 k W R127 302 153 15k W R128 302 184 180 k W R131 302 472 4 7 k W R134 301 393 39 k W 5 R136 303 224 220 k 1 W 5 R137 302 101 100 Ω W 20000 21069 R137 302 473 47 k W 21070 up R141 309 040 56 5 k W Prec 1 R143 309 176 43 4 k W Prec 1 R144 324 309 16 2 k 1 W Prec 1 20000 22539 R144 324 323 22 6 k 1 W Prec 1 22540 up R146 30...

Page 81: ...5 R331A 309 090 50 k W Prec 1 R331C 309 228 12 5 k W Prec 1 R331E 309 229 5 55 k W Prec 1 R331G 309 230 2 63 k W Prec 1 R331J 309 231 16 69 k W Prec 1 R331M 302 104 100 k W R331N 302 104 100 k W R334 309 234 154 k W Prec 1 R336 310 065 56 5 k 1 W Prec 1 R337 311 045 15k 2 W Var MAG REGIS R338 310 086 50 k 1 W Prec 1 R341 311 032 250 k 2 W Var EXT HORIZ DC BAL R343 302 474 470 k W R344 302 392 3 9 ...

Page 82: ...ec 1 R408F 309 241 1 28 k W Prec 1 R408G 309 203 505 4 Ω W Prec 1 R408H 309 178 250 Ω W Prec 1 R408J 309 240 125 Ω W Prec 1 R408K 309 128 50 Ω W Prec 1 R408L 309 177 25 Ω W Prec 1 R409B 316 123 12 k W R409C 315 103 10 k W 5 R409D 316 392 3 9 k W R409E 315 272 2 7 k W 5 R409F 315 222 2 2 k W 5 R409G 316 152 1 5 k W R409H 315 102 1 k W 5 R409J 315 331 330 Ω W 5 R410 312 583 1 meg W Prec 1 R411 302 1...

Page 83: ...3 22 k W 5 R458 301 223 22 k W 5 R461 302 102 1 k W R462 309 414 5 meg W Prec 1 R464 301 303 30 k W 5 R465 Use 301 565 5 6 meg W 5 R466 311 028 2 x 100 k 2 W Var POSITION R467 Use 301 565 5 6 meg W 5 R468 302 103 10k W R469 302 103 10k W R470 309 195 90 k W Prec 1 R471 302 102 1 k W R472 304 223 22 k 1 W R473 302 102 1 k W R474 305 273 27 k 2 W 5 R475 Use 306 333 33 k 2 W R476 306 273 27 k 2 W R47...

Page 84: ... Prec 1 R630 302 333 33 k W R631 302 105 1 meg W R632 302 102 1 k W R633 302 105 1 meg W R635 302 183 18k W R636 302 105 1 meg W R637 308 040 1 5 k 25 W WW 5 R639 302 333 33 k W R642 302 104 100 k W R643 302 104 100 k W R644 302 101 100 Ω W R645 302 101 100 Ω W R646 306 150 15 Ω 2 W R647 306 150 15 Ω 2 W R648 309 030 1 8 k W Prec 1 R649 310 068 42 226 k 1 W Prec 1 R650 302 470 47 Ω W R651 302 470 ...

Page 85: ... 302 474 470 k W R820 302 102 1 k W R824 316 472 4 7 k W R825 306 225 2 2 meg 2 W R826 311 039 1 meg 2 W Var HIGH VOLTAGE R827 306 275 2 7 meg 2 W R828 306 335 3 3 meg 2 W R829 306 335 3 3 meg 2 W R830 306 395 3 9 meg 2 W R831 311 254 5 meg 2 W Var FOCUS Lower Beam R832 311 254 5 meg 2 W Var FOCUS Upper Beam R833 311 026 100 k 2 W Var HORIZ SENS BAL R834 316 472 4 7 k W R836 306 395 3 9 meg 2 W R8...

Page 86: ...0 Ω W Prec 1 R890 309 096 10 Ω W Prec 1 R899 308 090 25 Ω 1 W WW Switches Unwired Wired SW10 SW17 SW20 SW126 SW160 260 233 262 177 260 235 262 178 260 447 260 501 260 529 262 556 Rotary Rotary Slide Lever Rotary TRIGGER SELECTOR TRIGGERING LEVEL TRIGGER SELECTOR Slope MODE TIME CM SW160V 311 108 SW331 260 236 262 172 Rotary HORIZONTAL DISPLAY SW403A 260 238 262 179 Rotary INPUT SELECTOR Upper SW40...

Page 87: ...87 6DJ8 ECC88 V324 154 022 6AU6 V354 154 022 6AU6 V364 154 187 6DJ8 ECC88 V414 V444 157 073 6AU6 V454 154 022 6AU6 V464 154 022 6AU6 V474 154 039 12AT7 V484 154 039 12AT7 V493 154 022 6AU6 V602 154 168 5AR4 GZ34 V636 154 078 6AN8 V637 154 044 12B4 V639 154 052 5651 V652 154 119 6BW4 V666 154 078 6AN8 V677 154 044 12B4 V722 154 168 5AR4 GZ34 V746 154 078 6AN8 V747 154 044 12B4 V757 154 044 12B4 V80...

Page 88: ...502A Electron Tubes continued Tektronix Ckt No Part Number Description S N Range V822 154 051 5642 V832 154 051 5642 V859 154 246 T5021 2 CRT Standard Phosphor V862 154 051 5642 V873 154 078 6AN8 V875 154 022 6AU6 6 32 ...

Page 89: ...TYPE 502A OSCILLOSCOPE A ...

Page 90: ...A BLOCK DIAGRAM MRH Z6 3 ...

Page 91: ... TYPE 502A OSCILLOSCOPE A ...

Page 92: ...A CIRCUIT NUMBERS 1 THRU 59 I Ixj 263 TIME BASE TR IGGER ...

Page 93: ......

Page 94: ...FORMS 4 VOLTAGE READINGS WERE OBTAINED WITH CONTROLS BETAS FOLLOWS HORIZONTAL DISPLAY NORMAL TRIGGER SELECTOR EXT DC TIME CM I MILLISEC TRIGGERING LEVEL2 FOR WAVEFORMS RECURRENT FOR LOWER VOLTAGE READINGS RECURRENT FOR UPPER VOLTAGE READINGS FULL LEFT MOT AUTO MODE SWITCH NOR MAL TIME BASE GENERATOR rciRCuTT NUMBERS 1 I 00 THRU I 89 ...

Page 95: ...TI M I NG RESI 5TORS TIMING CAPACITORS TYPE 502A OSCILLOSCOPE ...

Page 96: ...SWI6O HOLD OFF CAPACITORS 4 RESISTORS TIM ING CAPACITORS o A TIMING SWITCH job ...

Page 97: ...TAGE READINGS were obtained WITH CONTROLS SET AS FOLLOWS HORIZONTAL DISPLAY TRIGGER SELECTOR TRIGGERING LEVEL HORIZONTAL POSITIONS FOR LOWER VOLTAGE READINGS FOR UPPER VOLTAGE READINGS NORMAL EXT DC FULL LEFT BUT NOT SWITCHED TO AUTOMATIC FULL RIGHT FULL LEFT TYPE 502A OSCILLOSCOPE ...

Page 98: ... 1 INPUT AMPLIFIER OUTPUT AMPLIFIER A CIR CUIT NUMSER 5 300 THR U 399 ZG3 joe ...

Page 99: ...L______________________ CHANNEL A _____________________ J P ATTENUATOR J TYPE 5O2A OSCILLOSCOPE L______________________ CHANNEL E r ATTENUATOR A ...

Page 100: ...CMO 363 VERTICAL ATTENUATOR SWITCH A ...

Page 101: ...INPUT AMP SECOND AMP TYPE 5O2A OSCILLOSCOPE READINGS WERE WITH CONTROLS SET AS FOL INPUT SIGNAL SENSITIVITY VERTICAL POSITION FOR LOWER VOLTAGE READINC FOR UPPER VOLTAGE READIH C ...

Page 102: ...474B k 2A77 TO LEFT HAND DEFL PLATE THRU SW489 2R HORlZ AMP DIA6 SW 469 HORiz DEFL I PLATE SELUTORl ALSO SEE HORIZ AMP I t TIME BASE GEN t IAG IOOV P 467 5 G M p 480 9OK R 482 22 L 102 98 V4B4A 2 J2AT7 lV CM GAIN R 475 GAIN ADJ FOR HOR II MODE R 4SS 33R 7 K P 478 4 7K 1 5 7 R 479 4 7 R I V484B k 2AT7 176 P 464 27 K 309 1 I I I I I I I I I I I I I I I I I I I I I I IOOV 1 T Hupper BEAM 1 VERT AMP I...

Page 103: ...TYPE 5O2A OSCILLOSCOPE OOM HEATER WIRING DIAGRAM ...

Page 104: ...POWER SUPPLY CIRCUIT NUMBERSI 600 THRU 799 ...

Page 105: ...VOLTAGE READINGS WERE OBTAINED WITH CONTROLS SET AS FOLLOWS INTENSITY FULk LEFT SEE PARTS LIST FOR EARLIER VALUES AND SERIAL NUMBER RANGES OF PARTS MARKED WITH BLUE OUTLINE TYPE 5O2A OSCILLOSCOPE c ...

Page 106: ...CIR CUIT NUMBER S 800 THR U 869 CRT CIRCUIT c 9G4 ...

Page 107: ...CA LIBp A TOp MULTIVIBP A TOR 1 IOOV o TYPE 5O2A OSCILLOSCOPE A ...

Page 108: ...CAL OUT CF CALIBRATOR A CIRCUIT NUMBERS 8 7O THRU 899 4Z ...

Page 109: ...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 110: ...TYPE 502A TENT S N 23430 PARTS LIST CORRECTION CHANGE TO V152 157 0104 01 Selected 6AL5 M913U 665 ...

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