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GATE

 

voltages

 

available 

at

 

the

 

front 

panel

 

binding

 

posts.

 The 

duration

 

of

 

the

 

time

 

V5

 

is

 

cut

 

off

 

is

 deter­

mined 

by

 

the 

time

 

constant

 of

 

C7,

 

R20C,

 R20C1

 thru

 

R20C9 (depending

 upon

 

the position

 

of

 

S10A),

 and

 

the 

voltage

 

applied

 across 

the

 

circuit

 

and

 

is

 

substantially 

independent

 

of

 

the

 characteristics

 

of

 

the 

trigger

 

im

­

pulse. 

To

 

cover

 a

 

range

 

of

 

sweep

 time 

from 

.1 

sec. 

to

 

1 microsecond, 

C7

 

has

 five values

 as

 

selected 

by

 

the 

SWEEP 

RANGE 

switch.

 

The

 

calibrated

 

variable

 

resistor 

R20C 

is

 returned 

to 

+225

 

volts. 

This

 makes

 

possible

 

the

 

use

 

of

 a 

larger

 

value

 

of

 

C7

 

than

 would

 otherwise be 

possible, thus

 

reducing

 

the

 

voltage

 

divider

 

action

 

of

 

the 

stray

 capacitances

 

to 

ground in

 

the

 

grid 

circuit

 

of 

V5. 

Variation

 of 

R20C, 

R20C1-9,

 in

 conjunction

 with

 

the

 five

 

values of

 

C7

 

gives

 

a

 continuously

 

variable

 adjustment

 

of

 multivibrator 

pulse 

length.

Unblanking

 

Circuit

During

 

the

 waiting

 

period

 

the

 

bias

 

on

 

the

 cathode

 

ray

 

tube

 is 

such

 that it is

 

completely

 

cut off. 

As soon

 

as 

a

 

trigger

 

appears

 

and

 

the

 

sweep

 

starts,

 it

 

is

 

necessary to

 

provide 

a

 positive pulse 

on

 

the grid

 

of

 

the 

cathode 

ray 

tube

 

and

 

thus 

turn on

 the

 

electron

 

beam. 

This

 

pulse 

should

 have

 

an extremely

 

fast

 rise

 

and

 a very

 

flat 

top 

so

 that

 

the

 

brightness 

of 

the

 

image is

 

uniform.

 To 

secure a

 pulse of

 this

 

nature,

 the 

negative 

pulse 

from

 

the 

grid

 

of

 

V5

 

is

 

limited

 by plate 

current cutoff 

in 

V7.1A 

before

 

it

 

reaches

 

full amplitude.

 

The

 

voltage 

divider

 R37,

 

R38 

sets

 the 

d.c. 

bias

 

on

 

the

 

grid 

of

 

V7.1A

 

at 

approximately

 

0

 

volts

 

and

 supplies

 

a

 negative

 

pulse 

of

 45

 volts amplitude.

 Cl

 

2

 insures

 

that 

the

 

leading

 

edge 

will

 

be

 

coupled

 

thru

 

without

 loss

 

of

 

rise 

time

 

due

 

to

 

grid

 

and 

wiring

 

capacities 

to 

ground.

 

The 

45

 volt 

negative 

pulse

 

is

 more

 

than

 adequate

 

to

 

drive

 

V7.1A

 

into 

cutoff,

 

thus

 

producing at

 

the

 

plate

 

a

 

square,

 

flat 

topped

 

posi­

tive

 

pulse having

 

an

 

amplitude

 of 

80 

volts. 

To 

provide

 

increased

 rise

 time,

 

L2.1

 is

 

employed

 

in

 the 

plate 

circuit 

of

 

V7.1A.

 

The 

cathode follower V7.1B

 

serves

 

to

 isolate

 

the 

plate 

circuit

 

of

 

V7.1A

 

from

 

the 

capacity to

 ground 

of

 the

 

cathode

 

ray 

tube

 grid 

and

 

associated

 

wiring,

 

thus

 

preventing

 

any 

appreciable

 reduction

 in

 

rise

 

time

 

due

 

to

 

their

 effect.

 

This

 

circuit

 

is

 

capable of

 unblanking

 

the 

tube

 in

 

less

 

than

 

.1

 

microsecond after a 

sharp

 trigger

 

pulse

 reaches

 

the

 

TRIGGER 

INPUT

 binding post.

Gate

 

Output

 Generator

V8

 

serves

 

to

 isolate

 

the

 

gate

 output

 

binding

 

posts

 

from 

the

 

multivibrator.

 

It

 

receives

 a

 

positive

 

pulse on its

 

grid

 

of

 

the same

 duration 

as

 the 

sweep

 

from the

 plate of 

V5 

via the voltage

 

divider 

R32

 and 

R33.

 C

10

 maintains the

 

steep

 

sides 

of 

the

 

pulse.

 

Since

 

the 

plate

 

and

 

cathode

 

load

 

resistors

 are 

equal,

 

pulses

 of 

equal

 

size

 

but

 oppo

­

site

 

polarity

 

appear 

at

 

the

 

plate and cathode. The

 

+gate

 

from

 

the 

cathode

 

has no

 

blocking

 

capacitor 

and 

therefore

 preserves

 

the

 square

 

pulse

 for

 the 

longest 

sweeps. 

It

 

was

 

not 

felt

 

desirable 

to

 

have

 

the

 

—

Gate 

binding

 post carry the

 

+225 

V potential

 of the

 

plate; 

therefore

 

a 

blocking 

capacitor

 

is 

used.

Sweep

 

Generator

The

 sweep

 

generator

 

circuit 

produces

 the 

basic

 

wave

 

necessary

 

to

 

sweep the

 

beam

 

linearly

 across

 

the

 

tube

 

and

 return it

 

to

 its 

starting

 

point.

 

During

 

the

 waiting

 

period

 the 6AG7 

tube

 

V9

 

is

 

held

 

fully

 

conducting

 

since

 

it

 has

 no

 bias

 

and

 

therefore

 

its 

plate

 

is

 

about

 

at

 ground

 

potential.

 

When 

a

 trigger

 

occurs

 

the

 

negative pulse 

from

 

the 

multivibrator

 

cuts 

the

 

grid

 

of 

V9

 off 

very

 

rapidly. 

The

 plate

 therefore

 

rises 

in exponential

 

fashion

 

at

 

a 

rate 

depending

 

upon

 R20D,

 

R20D1-9

 

(as 

determined

 by

 

setting

 

of

 

S10B),

 

R39, 

the

 

voltage

 

applied

 

across

 

the 

circuit,

 and

 

Cl5.

 

When

 

the 

multivibrator

 

pulse

 

ends

 

V9

 conducts 

again,

 

thus

 

discharging

 

C1

5. 

Since

 

C1

5 

is 

charged to 

only

 

about

 

5%

 

of

 

the

 

supply

 

voltage

 the 

rate

 

of

 

rise

 

is 

very

 

nearly

 

linear.

 

Five

 

values

 of C1

5

 

as 

determined

 by

 

the 

SWEEP

 

RANGE

 

switch

 in combina

­

tion

 

with

 the 

variable

 

resistors R20D

 

and

 

R20D1-9

 

pro

­

vide

 a

 

continuous

 variation

 of sweep 

speed of

 

from .1 

sec.

 

to 1 microsecond

 

for

 a

 

10

 

cm

 

sweep.

 

In

 

order

 to

 

maintain

 

the

 

correct

 

multivibrator pulse

 length

 

as the

 

sweep

 

speed

 is 

increased,

 

the 

SWEEP

 

RANGE

 

switch

 

changes 

C7

 

in 

the

 

multivibrator

 and

 C

15

 simultaneous

­

ly.

 In a 

like

 

manner

 the

 

SWEEP

 

SPEED

 MULT,

 

controls 

are

 dual controls changing

 

R20C,

 

R20D 

and

 

R20C1-9,

 

R20D1-9

 

simultaneously. In

 order 

to

 

maintain

 

the 

cali

­

bration

 of

 

the

 SWEEP

 

SPEED

 MULT,

 

dials

 

when

 

tubes

 

are

 

changed, 

etc.,

 

the voltage

 

applied

 

to

 

R20D

 may 

be 

varied

 

by

 R42

 

which

 

sets

 

the

 

grid

 

potential

 of 

the 

cath

­

ode

 follower 

VI

5. 

The

 

use

 of

 

the

 

cathode

 

follower

 

in

­

stead

 

of

 

a

 

potentiometer

 

maintains

 

a

 constant 

charging

 

potential

 as 

R20D,

 

R20D1-9 

is 

varied.

 

Details

 

of this

 

adjustment

 

may

 

be found 

in

 

Section

 

IV.

 

The

 

two 

resistors

 

R39.

11

 and

 

R39.12

 

connected in

 

series 

are

 shunted 

across

 R20D1-9

 to 

compensate

 

for the

 

plate 

circuit

 

loads

 

of

 

V9.

Sweep 

Output Cathode Follower

To

 provide the 

necessary

 

isolation between

 capaci­

ties

 fastened 

to

 

the

 SWEEP

 

OUTPUT

 

binding

 

post and 

the

 

sweep

 generator,

 

the

 cathode

 follower

 

V

1

0

 

is 

pro­

vided.

 

The

 

grid 

of

 

V

1

0

 is

 

connected

 

to

 

the 

plate

 

of

 

the 

sweep

 

generator. 

The

 

SWEEP

 

OUTPUT 

binding

 post

 

is 

connected 

to

 

the

 

cathode

 

of

 

V10 

without

 

a

 

blocking

 

capacitor.

Sweep 

Magnifier

The

 function

 of

 

this

 

circuit

 

is

 

to

 delay the 

start

 

of

 

the

 

sweep

 

for a 

variable

 

time,

 and

 

then cause 

it

 to 

go

 

at

 

five 

times

 

its

 

normal

 

speed. This is 

accomplished

 

by

 

the 

biased

 

cathode

 

coupled 

amplifier 

V11

.

 

In

 

this 

type

 

of amplifier a

 

positive

 

change

 

in

 the grid 

potential

 of 

V

11A raises both cathodes

 and 

therefore

 

corresponds

 to

 

a

 negative

 

change

 

on

 

the

 grid

 

of 

V11B. 

Thus

 

the 

plate 

of

 

V

11

 

gives

 

an amplified 

version 

of 

the

 

signal 

on 

the

 

grid 

of

 

V11A,

 

without

 

change of 

polarity.

 The

 

SWEEP

 

MAGNIFIER 

POSITION

 

potentiometer

 

raises

 

the poten

­

tial

 

on

 

the

 grid

 

of

 

V

11

B

 

above

 ground 

and

 

thus

 

the

 

cath

­

ode potential of V

11

A.

 

No 

sweep 

appears

 

on

 

the

 

plate

 

of

 

V

11B

 

until

 the 

plate

 

of

 

the

 

sweep

 

generator

 

overcomes

 

this

 bias,

 

then

 the 

amplified

 sweep

 appears.

 

Sufficient 

bias

 

is available

 on

 the

 

SWEEP

 

MAGNIFIER

 POSITION 

to

 

make

 it 

possible 

to

 start

 

the

 

magnified

 

sweep 

at

 

any

 

point

 

on

 

the

 

normal

 sweep. V6

 

is employed 

as

 a

 

DC

 

restorer

 

to

 

insure

 

that

 

the

 magnified 

sweep

 

will

 start 

at

 

the 

same 

potential

 

each time,

 

thus 

preventing

 jitter

 

or 

instability 

of

 

the 

trace.

 

When

 

the 

magnified sweep 

is 

not

 desired,

 

the

 

SWEEP 

MAGNIFIER POSITION 

knob 

TYPE

 511-A, 51

1-AD

SECTION

 3, 

PAGE

 2

Summary of Contents for 511A-AD

Page 1: ......

Page 2: ......

Page 3: ...E 511A AD SERIAL NUMBER _________________________ INSTRUCTION MANUAL MANUFACTURERS OF CATHODE RAY AND VIDEO TEST INSTRUMENTS Sunset Highway and Barnes Road P O Box 831 Portland 7 Oregon U S A Phone CYpress 2 2611 Cables Tektronix ...

Page 4: ......

Page 5: ...uator Frequency compensated RC type with attenuation ratios of 2 4 and 8 Vertical Deflection Sensitivity Without amplifier 27 V per cm maximum 200 V per cm minimum DC or peak to peak AC 1 Stage 2 7 V per cm maximum 40 V per cm mini mum 2 Stages 27 V per cm maximum 4 V per cm mini mum Sensitivity is reduced by a factor of 10 when probe is used In no case should the combined AC and DC input voltages...

Page 6: ...EED MULT Decade control plus vernier control setting sweep speed and duration within range indicated by SWEEP RANGE VERT POSITION Twin potentiometers controlling aver age potentials of vertical deflection plates and therefore the image posi tion EXT SWEEP ATTEN Potentiometer controlling the fraction of the voltage applied to EXT SWEEP INPUT binding post which will reach the grid of the sweep ampli...

Page 7: ... grid of V4 in the multivibrator circuit This bias determines whether the sweep will operate recurrently or must be triggered DEFLECTION POLARITY Switch determining source and polari ty of trigger voltage Potentiometer controlling the bias ap plied to the trigger amplifier tube V2 and thereby determining the ampli tude of trigger signals applied to the multivibrator Binding post connecting externa...

Page 8: ......

Page 9: ...sine wave appears The oscilloscope is now observing the 50 60 cycle power line waveshape clipped by the calibrator cir cuits To observe other waveshapes connect them to the SIG NAL INPUT binding post turn the SIGNAL CALIBRATE switch to SIGNAL select the appropriate sweep speed etc SWEEP CIRCUIT ADJUSTMENTS The sweep circuit of the Type 511A is different from the gas tube type usually employed in p...

Page 10: ...y different tubes etc by a screwdriver adjustment inside the case Procedure for adjustment of this control is described in Section IV Recurrent Sweep In case it is desirable to have a sweep without using any sort of trigger merely advance the SWEEP STABILI TY control until a stable sweep is obtained This sweep is the conventional sawtooth variety as used in most oscilloscopes Single Sweep The trig...

Page 11: ...le if desired by in creasing L6 and readjusting L7 L8 L9 and L10 but overshoot will occur on steep wave fronts With opti mum transient response the rise time 10 to 90 of full amplitude is 04 microseconds or better At the low frequency end of the band the top of a 10 000 micro second square pulse will not depart by more than 5 from flatness The deflection sensitivity is approximately 2 7 V per cm p...

Page 12: ...e is now equal to the signal amplitude CAUTION IF THE INPUT PROBE ATTEN 10X IS USED THE SIGNAL AMPLITUDE IS EQUAL TO TEN TIMES THE CALIBRA TION VOLTAGE The scale on the CAL VOLTAGE potentiometer is calibrated in peak to peak volts If a sine wave is being measured this may be converted to R M S by dividing by 2 828 CAUTION DO NOT OVERLOAD THE AMPLIFIERS WHEN MAKING AMPLI TUDE MEASUREMENTS Another m...

Page 13: ...2 7 0 180 120 6 0 DEGREES OF PHASE SHIFT FREQUENCY TEKTRONIX JNC 12 28 50 ...

Page 14: ......

Page 15: ... TRIGGER SEL switch is in the INT or EXT positions signals are taken off the cathode of VI and do not change in polarity Therefore a positive impulse must be supplied by the external source or vertical amplifier as the case may be With the TRIGGER SEL in the INT or EXT positions signals are taken off the plate and reversed in polarity thus providing the required positive output from negative trigg...

Page 16: ...the beam linearly across the tube and return it to its starting point During the waiting period the 6AG7 tube V9 is held fully conducting since it has no bias and therefore its plate is about at ground potential When a trigger occurs the negative pulse from the multivibrator cuts the grid of V9 off very rapidly The plate therefore rises in exponential fashion at a rate depending upon R20D R20D1 9 ...

Page 17: ...st est sweeps C24 and C25 are shunted across them to transmit these frequencies VERTICAL DEFLECTION SYSTEM The vertical deflection system provides the means of attenuating or amplifying input signal amplitudes so that they may present a convenient image on the cath ode ray tube Signals may be attenuated as much as 8 times or amplified as much as 100 times without ap preciable change in shape Probe...

Page 18: ... PEAK VOLTS NOT RMS MULTIPLY RMS BY 2 828 TO CONVERT TO PEAK TO PEAK The calibrator waveform is derived from the line fre quency voltage of a 280 volt T1 secondary winding The positive peak is clipped limited by the diode connected section of a 12AT7 V16 1 The point of limit ing is determined by the setting of the CAL ADJ poten tiometer R75 4 Since the voltage across R75 4 is ob tained from the 22...

Page 19: ... and V26 is used This regulator oper ates in the same manner as the 225 supply using the regulated 225 as reference voltage Thus if the 225 is not set ats its correct value the 450 volt output will also be in error In order to provide the and 1500 volts neces sary to operate the CRT an oscillator type supply is used Since the input power to the oscillator comes from the regulated 225 volts its out...

Page 20: ......

Page 21: ...uld be checked for serious discoloration which would indicate excessive dissipation and there fore faulty operation A moderate amount of discolora tion is normal 3 Connections Loose screws or nuts should be tightened This is especially important when the screw serves as an electrical connection Corrosion of the chassis and electronic components is unlikely under normal conditions It should be remo...

Page 22: ...rol centered the HOR POSITION control clockwise the SWEEP STABILITY control counter clockwise and no vertical input signal measure the voltage between each CRT deflection plate and ground which should be within 60 volts The average potential of both horizontal X plates or both vertical Y plates should be within 40 volts of ground when measured under the above conditions Abnormal potential on the h...

Page 23: ...f V9 fig 21 is not If the sawtooth amplitude is low slow sweep speed V9 is known to be good and circuit volt ages appear normal remove V9 and measure the volt age at terminal 4 of V9 socket which should be between 5 and 30 volts This measurement is made with the SWEEP STABILITY control fully counter clockwise Error in sweep speed on one range only may be due to a defective timing capacitor C15A B ...

Page 24: ...ttenuator section If satisfactory waveshape cannot be obtained try another 6AG7 2 C39 C51 These electrolytic capacitors are em ployed in the low frequency compensating circuits and should be replaced if the range of R99 and R116 be comes insufficient to properly compensate the amplifier It is necessary that the actual capacity be within the limits specified in the Parts List section 3 R111 R111 1 ...

Page 25: ...NT Centered AVERAGE TUBE SOCKET VOLTAGES Measured at 117 volt line DC voltmeter sensitivity 20 000 ohms per volt Tube Pin To Voltage V1 1 2 Gnd 0 3 5 Gnd 15 5 4 Gnd 7 50 volt scale 6 Gnd 187 7 Gnd 6 5AC 8 Gnd 177 V2 1 2 Gnd 0 3 5 Gnd 10 TRIGGER AMPL clockwise 3 5 Gnd 0 TRIGGER AMPL counter clockwise 4 Gnd 0 TRIGGER AMPL clockwise 4 Gnd 20 TRIGGER AMPL counter clockwise 50 volt scale 6 Gnd 225 7 Gn...

Page 26: ...ise 8 Gnd 3 2 SWEEP STABILITY counter clockwise V10 3 Gnd 0 4 Gnd 6 5AC 5 Gnd 225 6 Gnd 65 SWEEP STABILITY clockwise 6 Gnd 3 2 SWEEP STABILITY counter clockwise 7 Gnd 70 SWEEP STABILITY clockwise 7 Gnd 16 SWEEP STABILITY counter clockwise V11 1 Gnd 156 MAGNIFIER POSITION out 1 Gnd 145 MAGNIFIER POSITION clockwise 2 Gnd 135 MAGNIFIER POSITION out 2 Gnd 110 MAGNIFIER POSITION clockwise 3 Gnd 0 4 Gnd...

Page 27: ... scale 6 Gnd 160 DEFLECTION POLARITY up 6 Gnd 195 DEFLECTION POLARITY center 6 Gnd 165 DEFLECTION POLARITY down 7 Gnd 0 8 Gnd 190 DEFLECTION POLARITY up 8 Gnd 150 DEFLECTION POLARITY center 8 Gnd 110 DEFLECTION POLARITY down V19 1 5 Gnd 32 DEFLECTION POLARITY up and center 1 5 Gnd 29 DEFLECTION POLARITY down 2 Gnd 6 5AC 3 Gnd 0 4 Gnd 23 DEFLECTION POLARITY up 50 volt scale 4 Gnd 20 DEFLECTION POLA...

Page 28: ...V22 pin 8 5 2AC 4 6 Gnd 280AC 8 Gnd 325 V23 2 V23 pin 8 5 2AC 4 6 Gnd 280AC 8 Gnd 325 V24 1 6 Gnd 335 3 V24 pin 4 6 5AC 4 7 Gnd 280AC V25 1 450 18 2 3 Gnd 450 4 V25 term 3 6 5AC 5 6 Gnd 680 V26 1 225 1 3 2 7 225 0 3 V26 pin 4 6 5AC 5 450 18 6 225 46 V27 1 4 225 38 2 5 Gnd 325 3 6 Gnd 225 7 Gnd 6 5AC 8 Gnd 0 V28 1 Gnd 87 2 7 Gnd 89 3 Gnd 0 4 Gnd 6 5AC 5 225 38 6 Gnd 137 V29 1 Gnd 89 4 Gnd 0 V30 2 G...

Page 29: ...Gnd 0 5 6 V2 pin 8 0 7 225 10K V4 1 Gnd 0 2 Gnd 0 3 Gnd 0 4 Gnd 75K 4 225 75K 5 Gnd 0 6 Gnd 10K 6 225 12K 7 Gnd 0 8 225 9 5K V5 1 Gnd 0 2 Gnd 0 3 Gnd 0 4 Gnd 200K 4 Gnd 2 2M 5 Gnd 0 6 Gnd 10K 6 225 12K 7 Gnd 0 8 225 4 5K 8 V4 pin 4 80K V6 1 5 140 35M 2 3 7 Gnd 0 4 Gnd 0 V7 1 1 7 225 14 7K A B 2 140 65K 2 225 70K 3 4 5 Gnd 0 6 450 0 8 Gnd 47K V8 1 2 225 10K 3 Gnd 0 SWEEP SWEEP TRIGGER AMPL clockwis...

Page 30: ... 3 Gnd 0 4 Gnd 0 6 7 Gnd 0 1 V12 pin 5 180 2 7 140 1 IK 2 7 V14pin2 900 3 Gnd 0 4 Gnd 0 5 6 450 25K 1 Gnd 0 HOR POSITION clockwise 1 Gnd 90K HOR POSITION counter clockwise 2 7 140 11K 3 Gnd 0 4 Gnd 0 5 6 450 25K 1 450 0 2 3 450 2 4 450 0 5 450 0 6 450 240K to 480K depending on setting of R 42 6 450 0 with SWEEP RANGE set at 1 microsec 7 V9 pin 8 200K SWEEP SPEED MULT 1 0 7 V9 pin 8 2 2M SWEEP SPEE...

Page 31: ... access panel 0 14 V20 pin 1 2 V21 1 T1 term 7 0 2 3 7 T1 term 11 0 4 T1 term 10 0 6 T1 term 9 0 V22 2 T1 term 13 0 4 6 T1 term 14 0 8 225 IK V23 2 V22 pin 2 0 4 6 T1 term 16 0 8 V22 pin 8 0 V24 1 6 140 4 5K 3 T1 term 17 0 4 7 T1 term 16 0 V25 1 V25 pin 5 470K 2 3 T1 term 6 0 4 450 0 5 6 V21 pin 7 0 SIGNAL CALIBRATE switch in SIGNAL position SIGNAL CALIBRATE switch in 100 v position INPUT CHAN SEL...

Page 32: ...tting of R165 2 V32 1 3 4 5 6 7 8 Gnd 50M 2 V32 pin I 1 Cap V33 pin 3 0 V33 1 3 4 5 6 7 8 Gnd 1 3K 2 V33 pin 1 1 Cap Gnd 9M TRANSFORMER CONTINUITY T1 Measured with leads disconnected Terminals Ohms Resistance 20 C 1 to 3 1 7 2 to 4 1 7 5 to 6 3 7 to 8 147 8 to 9 150 10 to 11 27 12 to 13 03 14 to 15 10 8 15 to 16 10 9 16 to 17 21 18 to 19 025 20 to 21 6 1 22 to 23 42 24 to 25 25 T2 Measured with V3...

Page 33: ... in control settings of the 511 A under test 6 Line voltage variations DEFLECTION POLARITY SELECTOR WAVEFORMS Normal operation of this circuit for observation of pulses is shown in the following photographs The saw tooth pulse has a duration of 1 millisecond and a 60 cycle repetition rate Fig 2 Same pulse with DEFLECTION POLARITY switch in center position Note that position of the step is unchange...

Page 34: ...Amplitude 15 volts Fig 8 Waveform at V31 plate Amplitude 350 volts Fig 7 High voltage supply oscillator waveform at V31 grid Amplitude 75 volts SWEEP AND TRIGGER CIRCUIT WAVEFORMS Fig 10 Multivibrator waveform at V4 plate controls set for 10 µsec recurrent sweep Amplitude volts Fig 9 Multivibrator waveform at V4 grid with con trols set for 10 µsec recurrent sweep Amplitude 70 volts TYPE 511 A 511 ...

Page 35: ...e 45 volts Fig 15 GATE controls set for 10 µsec recurrent sweep Amplitude 45 volts Fig 16 GATE controls set for 10 µsec recurrent sweep Amplitude 45 volts Fig 18 Unblanking pulse at V7 cathode 10 µsec re current sweep Amplitude 65 volts Fig 17 Unblanking pulse at V7 cathode 1000 µsec recurrent sweep Amplitude 70 volts Fig 20 Waveform at V9 grid 10 µsec recurrent sweep Amplitude 50 volts Exposure m...

Page 36: ...et ting of SWEEP MAGNIFIER POSITION control Amplitude 30 volts Fig 24 Amplified sweep sawtooth at XI deflection plate 10 µsec recurrent sweep Amplitude 200 volts Fig 26 1 µsec negative pulse at V1 grid from either video amplifier or TRIGGER INPUT Amplitude 5 volt Fig 25 Amplified sweep sawtooth at X2 deflection plate 10 µsec recurrent sweep Amplitude 200 volts Fig 27 The same pulse at V2 grid Nega...

Page 37: ...e square wave when low frequency compensation is insufficient also in dicating need for L F adjustment Fig 33 Response to 1 megacycle square wave showing overshoot due to excessive high frequency com pensation Readjustment is indicated Fig 34 Response to 1 megacycle square wave showing the effect of insufficient high frequency compen sation Fig 35 Normal response to 1 kilocycle square wave Fig 36 ...

Page 38: ...ly clipped sine wave at pins 2 6 and 7 of Calibrator Limiter V16 1 Amplitude ap proximately 300 volts depending upon line voltage Fig 37 2 Positively and negatively clipped sine wave at pin 3 of Calibrator Limiter V16 1 Ampli tude 100 volts as set by potentiometer R75 4 CAL ADJ TYPE 511 A 511 AD SECTION 4 PAGE 18 ...

Page 39: ...ERN The RC compensated attenuator used in the Type 511A is really two attenuators in parallel one a re sistive divider and the other a capacity divider The ratio of the resistive divider is maintained by the use of accurate resistors Since the stray capacities are not negligible compared to the values used in the capacity divider each divider incorporates a variable ceramic trimmer capacitor in on...

Page 40: ... electrolytic condensers it may be occasionally necessary to cor rect for a change in their capacity This is easily done by observing the response to a low frequency square wave 30 60 cycles and making the following adjust ments 1 With the INPUT CHAN SEL at 1 STAGE adjust R116 the rear LF ADJ so that the best waveshape is obtained 2 Move to the 2 STAGES position and adjust R99 the front LF ADJ BE ...

Page 41: ...Fig 41 Input Probe disassembled SECTION 4 PAGE 21 TYPE 511 A 511 AD ...

Page 42: ...Fig 42 Interior view right front side TYPE 511 A 511 AD SECTION 4 PAGE 22 ...

Page 43: ...Fig 43 Interior view left side SECTION 4 PAGE 23 TYPE 511 A 511 AD ...

Page 44: ...TYPE 511 A 511 AD SECTION 4 PAGE 24 ...

Page 45: ...Tf S 4 t C15C C15D ...

Page 46: ...R30 1 SECTION 4 PAGE 25 TYPE 511 A 511 AD ...

Page 47: ...1 1 Fig 46 Video Amplifier top C51 Fig 47 Video Amplifier bottom TYPE 511 A 511 AD SECTION 4 PAGE 26 ...

Page 48: ...SECTION 4 PAGE 27 TYPE 511 A 511 AD ...

Page 49: ...11 A 511 AD SECTION 4 PAGE 28 TOP VIEW OUT BOTTOM VIEW Fig 51 Vertical Attenuator bottom Fig 50 Vertical Attenuator top RI23 RI2O 2 RI20 I RI2O R119 1 RII9 Fig 52 Deflection Polarity Switch and Terminal Board ...

Page 50: ...SECTION 4 PAGE 29 TYPE 511 A 511 AD L24 ...

Page 51: ......

Page 52: ...0 400 WVDC C12 Fixed Mica or Cer 47 µµf 10 400 WVDC C13 Fixed PT 01 µf 20 600 WVDC C14A B Fixed EMC 2x20 µf 20 50 450 WVDC C15AA Fixed Mica or Cer 12 µµf 10 400 WVDC C15A Var Cer 7 45 µµf 500 WVDC C15B Fixed PT 920 µµf 1 Selected 400 WVDC 27 C15C Fixed PT 01 µf 1 Selected 400 WVDC 27 C15D Fixed PT 1 µf 1 Selected 400 WVDC 37 C15E Fixed PBT 1 µf 1 Selected 400 WVDC 2 55 C17 Fixed PT 1 µf 10 400 WVD...

Page 53: ...C C50 Fixed PT 1 µf 20 400 WVDC C51A B Fixed EMC 2x20 µf 10 450 WVDC 2 38 C52A B Fixed PBT 2x 05 µf 20 400 WVDC C53 Fixed PT 1 µf 20 400 WVDC C54 Fixed Cer 1000 µµf GMV 500 WVDC C55 1 Fixed PT 1 µf 20 400 WVDC C56 Fixed PT 1 µf 20 400 WVDC C58 Fixed PT 1 µf 20 2000 WVDC C59 Fixed PT 1 µf 20 2000 WVDC C60 Fixed PT 1 µf 20 400 WVDC C65 Fixed EMC 40 µf 2x20 20 50 450 WVDC C66 Fixed EMC 40 µf 2x20 20 ...

Page 54: ...p 1 watt 15 K 10 R15 Fixed Comp 1 2 watt 47 ohm 10 R16 Var Comp 1 4 watt 100 K 20 R17 Fixed Comp 1 2 watt 100 K 10 R18 Fixed Comp 1 2 watt 220 K 10 R19 Fixed Comp 1 2 watt 47 ohm 10 R20C Var Comp 2 watt 220 K 20 R20D Var Comp 2 watt 220 K 20 R20C D replacement furnished only with hand calibrated sweep speed dial 8 38 R20C1 to 9 Fixed Comp 1 2 watt 220 K 10 R20D1 to 9 Fixed Prec 1 2 watt 200 K 1 ea...

Page 55: ...1 2 watt 10 meg 10 R56 2 Fixed Comp 1 2 watt 22 meg 10 R57 Var Comp 1 4 watt 100 K 20 R58 Fixed Comp 1 2 watt 4 7 K 10 R59 Fixed WW 10 watt 25 K 5 Inductive R60 Fixed Comp 1 2 watt 180 ohm 10 R61 Fixed Comp 2 watt 4 7 K 10 R62 Fixed Comp 1 watt 1 2 K 10 R63 Fixed WW 10 watt 25 K 5 Inductive R64 Fixed Comp 1 2 watt 180 ohm 10 R65 Fixed Comp 1 2 watt 560 ohm 10 R66 Fixed Comp 1 2 watt 560 ohm 10 R67...

Page 56: ...220 K 10 R99 Var Comp 1 4 watt 500 K 20 R100 Fixed Comp 1 2 watt 220 K 10 R101 Fixed Comp 1 2 watt 10G ohm 10 R102 Fixed Prec 1 2 watt 1 meg 1 40 R103 Fixed Comp 1 2 watt 68 K 10 R104 Fixed Comp 2 watt 680 ohm 10 R105 Fixed WW 5 watt 2 K 5 R106 Fixed Comp 2 watt 820 ohm 10 R107 Var Como 1 4 watt 500 ohm 10 Limited Rotation R108 Fixed Comp 1 2 watt 150 ohm 10 R109 Fixed Comp 1 2 watt 1 meg 10 R110 ...

Page 57: ...ed Comp 1 2 watt 1 5 meg 10 R137 Fixed Comp 1 2 watt 1 0 meg 10 R138 Fixed Comp 1 2 watt 120 K 10 R139 Fixed Comp 2 watt 4 7 meg 10 R140 Var Comp 1 4 watt 2 meg 20 R141 Fixed Comp 1 2 watt 1 5 meg 10 R142 Var Comp 1 4 watt 500 K 20 R149 Fixed WW 25 watt 1 K 5 R150 Fixed Comp 1 2 watt 470 K 10 R151 Fixed Comp 1 2 watt 150 K 10 R152 Fixed Comp 1 2 watt 47 K 10 R153 Fixed Comp 1 watt 220 K 10 R154 Fi...

Page 58: ...170 V tapped at 25 V approx 2 KC Secondaries 280 0 280V 250 ma 260 0 260V 30 ma insulated for 700 VDC 5 V 4 A insulated for 500 VDC 6 3 V 6A insulated for 500 VDC 6 3V 6A insulated for 650 VDC 6 3 V 6A insulated for 350 V R M S 6 3 V 3A insulated for 250 VDC 6 3 V 6A insulated for 1500 VDC 6 3 V 11 A ground 35 4 V R M S ground 30 50 Secondaries 1250 V at 1 ma 1 4 V 2A connected to 1250 V winding 1...

Page 59: ...VR150 High Voltage Oscillator 6AQ5 High Voltage Rectifier 1B3GT 8016 High Voltage Rectifier 1B3GT 8016 MISCELLANEOUS A510 Binding Post Adapter 1 88 B24 Binding Post bakelite 49 B21 Binding Post ground 34 Fl15 Filter green plastic 90 FSB4 3 Fuse 4AG 3 amp slow blowing 15 GR511A Graticule clear plastic 1 50 GC510 Graticule cover 50 KNF22 Knob 11 16 10 KNS48 Knob 1 1 2 skirted 39 NG12 Nut graticule 0...

Page 60: ...SECTION VI DIAGRAMS See also additional informations and enlarged dia grams inside back cover TYPE 511 A 511 AD ...

Page 61: ......

Page 62: ...EXT BLOCK DIAGRAM OF TYPE 5IIA CATHODE RAY OSCILLOSCOPE 7 13 51 ...

Page 63: ......

Page 64: ...SWEEP MAGNIFIER SWEEP AMPLIFIER ...

Page 65: ......

Page 66: ...E 225V 140V 511A OSCILLOSCOPE TYPE VERTICAL AMPLIFIER TO SIA INY SYNC R76 2 X 13 2K AVERAGE SUPPLY CURRENT AT CHASSIS TERMINAL BLOCK 140V SUPPLY 0 6MA 225V SUPPLY 125 MA CAPACITOR ______ _ ____ ARE IN PICOFARADS lO FARADS VALUES LESS THAN I ARE IN MICROFARADS IO 6FARADS UNLESS OTHERWISE STATED R05 500K VW S 9 VI9 6AG7 NETWORK j IN AD s 2 MODELS 1600V jCSIA Tsmf V16 I I2AT7 1C39B R98 220K C45B RIO ...

Page 67: ......

Page 68: ...K NOTE 20 21 IN SERIAL NO 2867 8 ABOVE fr 6 6 3V II bi 3V TO S7 VIA TERMINAL STRIP 0068 RI7I 820K RI72 82OK TO 24 25 TI 0 I800V 0 I500V 6JV CRT FH_ O 600V 6 3V O 450V 0 2 25V O I40V O6 3V 0X10 CAL O S7 O AVERAGE CURRENT AT TERMINAL STRIP 225V SUPPLY I90MA 140V SUPPLY 28 MA POWER SUPPLY TYPE 511A CATHODE RAY OSCILLOSCOPE 6 20 5U ...

Page 69: ......

Page 70: ...eeded it may be re moved from the circuit by means of a rotary switch operated from the front panel ADJUSTMENT AND MAINTENANCE If the Vert Ampl Atten potentiometer R107 or the limiting resistor R108 are replaced it may be necessary to change the delay network shunt resistance so that the correct termination is maintained To check for proper termination set the sweep speed at 3 to 10 microseconds a...

Page 71: ... Ceramic 1 5 7 mmf 10 500 WVDC INDUCTORS L1 to L23 Fixed L24 Variable RESISTORS R1 Fixed Composition watt 270 ohm 10 R2 Fixed Composition watt Selected SWITCH S1 l AD 25 in out DPDT Rotary RELAY Type l D 25 Only RL1 l D 25 Type 227A DPDT 32VDC 1000 ohm NOTE L l TO L 12 INCLUSIVE ARE COAXIALLY WOUND ON THE SAME COIL FORM L I3TOL 23 ti TYPE 511 A 511 AD SECTION 7 PAGE 2 ...

Page 72: ... under this warranty is limited to the repair or replacement of the instrument or any part thereof fail ure of which is not due to abuse For service under this warranty promptly advise the factory of all details pertinent to the failure Replace ment parts will be shipped via air transportation upon request prepaid to any point within the continental United States or Canada Should it be more conven...

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