Tektronix 7904A User manual

Table of contents

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.....

2-17

I

NT

EN

SITY

CO

NTR

O

L

S

.

.

. .

.

.........

.

.

......

.

.

. .

2-9



SPE

CT

RUM

A

N

A

L

YZER

PLUG-IN

UN

ITS

......

2-17

DIS

P

LAY

FOC

U

S

..............

.

.

......

.

.

........

2-9



Χ

-

Υ

OPERATION

....

.

. .

.

.

. .

.

.........

.

.

........

2-17

ASTIG

M

ATIS

M

-

F

OC

U

S

AD

JUST

MEN

TS

....

.

.

.....

2-9



R

AST

ER

DIS

PL

AYS

........

.

. .

.

.

.........

.

.

.....

2-18

BE

AMF

I

ND

ER

.

. .

.

.

.........

.

. .

.

.

......

.

.

........

2-9

T

R

AC

E

A

L

IG

NMEN

T

. .

.

.

. .

.

.....

. .

.

.........

.

.

. .

2-10



WA

R

ΝΙΝ

G

RE

ADO

UT

DIS

PL

AY

........

.

.

...

.

. .

.

.

.........

.

2-10

RE

ADO

UT

IDENTIFY

. .

.

......

.

.

.........

.

.

. .

2-10



Th

e

remaining

po

r

tio

n

of

this

Tab

le

of

Co

n

tents

lists

t

h

eser

vici

n

g

RE

ADO

UT

I

N

T

EN

SITY

.....

.

.

. .

.

......

.

. .

.

.

. .

2-10



i

n

st

r

uctio

n

s

by

qualified

p

e

r

so

nn

el

only

.

To

avoi

d

elect

r

ical

RE

ADO

U

TM

OD

ES

.....

.

.

............

.

.

.....

2-10



s

h

oc

k

,

do

not

perform

a

n

y

servici

n

g

othe

r

t

h

an

t

h

at calle

d

o

u

t

in

CA

RE

O

F

C

RT

SC

REEN

.

. .

.

.

.........

.

.

........

2-11



t

h

e

O

p

e

r

ating

I

n

st

ru

ctio

n

s u

n

less

qualified

to

d

o

so

.

7904

Α

I

n

str

u

ctio

n

TA

BLE O

F

CO

N

T

EN

TS (CO

N

T)

P

AG

E



P

AG

E

S

ERV

ICI

N

G

SA

FE

TY

S

UMM

A

R

Y

.........

.....

.

.

......

.

.

. . .

S1



T

HE

O

R

Y

O

F

O

PER

ATIO

N

(CO

N

T)

DIS

P

LAY-S

K

I

P

G

ENER

ATO

R

....

.

.

......

.......

.

3-33

CO

LUMN

AN

D

R

O

W

D

E

COD

ER

S

...

.

.

...

.

.

......

3-33

SECTION

3-THEORY

0F

OPERATION



Z

ER

OS

L

OGIC

A

N

D

MEM

O

R

Y

.

.

.

......

.

.

...

.

.

...

3-34

BL

OC

K DIAG

R

AM

...

.

.

............

.

.

......

.

.

......

.

.

.....

3-1



C

HAR

ACT

ER

G

ENER

ATO

R

......

.

.

......

.....

.

.

3-34

D

E

SC

R

I

P

TIO

N

........

.

. .

.

.

........

......

.

.

......

.

.

3-1



D

E

CI

M

A

L

POINT

L

OGIC

AN

D CHA

R

ACT

ER

D

ETAI

LE

D

CI

R

CU

IT

O

PER

ATIO

N

.

.

. .

.

......

.

.

...

.

.

......

.

.

3-3



POSITIO

N

CO

UNT

ER

....

.

.

.........

.

.

.....

.....

3-36

LOGIC

FUN

DA

MEN

TA

LS

.......

.

.

......

.

.

......

....

3

-

3



FO

RM

AT

G

ENER

ATO

R

. .

.....

.

. .

.

.

. .

.

...

.

.

...

.

.

3-37

SY

MB

O

L

S

....

.

.....

.

.

......

.

.

......

.

.

......

.

.

. .

3-3



Υ

-O

UT

PU

T

....

.

.

. .

.

.

..........

.....

.

. .

.

.

.....

..

3-37

L

OGIC

PO

L

A

R

ITY

.

.

......

.

.

. .

.

.... .

......

.

.

.....

3-3



Χ

-O

U

T

PUT

.......

.

.

. .

.

.

..........

........

.....

.

3-37

I

NPU

T/O

U

T

PU

T

TA

B

LE

S

....

.

.

......

.

.

......

....

3-3



DIS

PLAY SE

QUENC

E

..

.

.............

.

.

...

.

.

...

.

3-37

NON-DIGITAL

D

EV

IC

E

S

...

.

..

.

.

...

.

.

......

.

.

......

.

3-3



RE

ADO

UT

SYST

EM

(S

Ν

Β

031767

&

Above)

.....

.

.



3-37

I

NT

ER

CO

NNE

CTI

NG

DIAGR

AM

....

.

.

......

.

.

...

.

.

. .

3-6



DIS

PLAY FO

RM

AT

. .

. .

.

. .

.

.

. .

. .

. .

. .

.

.. . .

. .

.



3-37

M

OD

E

S

W

ITC

H

,

DIS

PL

AY

CO

N

T

R

O

L

A

ND



D

EVEL

O

P

I

N

G

THE

DIS

PLAY

. .

.

. .

...

.

. .

. . . .

.

.

3-39

CA

L

I

BR

ATO

R

.............

.

.

. .

.

...

.

.

. .

.

......

.

.

...

.

3-6



TI

MER

. .

.

. .

.

.

..

.....

. .

.

.

.....

...

.

. .

.....

.



3-41

CALI

BR

ATO

R

.............

.

.

......

.

.

......

.

.

...

.

3-6



TIME-SLOT

CO

UN

T

ER

.

.

. .

.

. .

.

..

. .

.

. .

. .

.

. .

.



3-44

M

OD

E

S

W

ITC

H

I

N

G

...........

.

.

...

.

.

......

.

.

....

3-6



W

O

R

D

TR

IGG

ER

.

. .

.

. .

.

. .

. .

.... .

.

.

. .

. .

.

. .

.



3-44

DIS

P

LAY

CO

NTR

O

L

..........

.

.

...

.

.

...



.....

...

3-6



C

H

A

NNEL

CO

UN

TER

. .

.

.

...

.

. .

.

. .

.

.. . . .

.

...



3-44

MAIN INTERFACE

...............

.

.

..... .

.

.

......

.

.

.

3-6



SI

N

G

LE

-S

H

OT

L

OC

K

O

UT

...

.

. .

. .

.

.

.....

. .

. .

.

3-45

LOGIC

...

.

.

. .

.

. .

.

.

...............

......

.

.

......

.

.

.3-6



EN

CODIN

G

THE

DATA

.

.

.

.. .

.

. .

.

. .

.

.....

. .

. .



3-45

H

O

R

IZO

N

TA

L

L

OGIC

.

.

.............

.

.

.....

......

3-8



CO

L

UMN

A

ND

R

O

W

DATA

S

W

ITC

HE

S

......

.

.



3-46

Α

S

WEEP

L

OC

K

O

UT

.

.

..........

.

.

......

.

.

...

3-8



DISP

LAY-S

K

I

P

G

ENER

ATO

R

. . . .

. .

.

.

.. .

.

. .

. .

.



3-47

ΒS

WEEP

L

OC

K

O

UT

STAG

E

.......

......

.

.

...

3-8



COL

UMN

A

ND

RO

W

D

E

COD

ER

S

.

.

.

. .

......

.

.



3-47

A

L

T

ERN

AT

E

PUL

S

E

G

ENER

ATO

R

...

.

.

.....

...

3-9



Z

E

R

OS

L

OGIC

A

ND

MEM

O

R

Y

.

. .

.

.

...

.....

.

.



3-47

Z-AXIS

LOGIC

. .

.

. .

.

.

. .

.

.

............

......

.

.

. .

3-10



CH

A

R

ACT

ER

G

ENER

ATO

R

..

.

.

. .

.

. .

. .

. .

.

. .

.

.



3-48

HO

R

IZO

N

TA

L

B

I

NARY

.

.

. .

.

.

. .

.

.

..........

.

.

...

.

3-11



HO

R

IZO

NTA

L

CHAR

ACT

ER

P

OSITIO

N

CO

UN

T

ER

3-50

1

.

Α

MODE

............

.

. .

.

.

.

..........

.

.

...

.

3-11



DE

CI

M

AL

POSITIO

N

L

OGIC

.

.

.

. .

.

......

. .

.

.

.



3-50

2

.

Β

MODE

...............

.

.

.

............ .

.

.

.

3-12



VE

CTO

R

G

EN

E

R

ATO

RS

.

. .

.

.

. .

.

.

.... . .

. .

.

.

.



3-51

3

.

C

H

O

P

M

OD

E

............

. .

.

.

..........

.

.

.

3-12



O

UT

PU

T A

MPL

I

F

I

ERS

. .

. .

.

.

. .

.

.

. .

......

.

.

.

.



3-51

4

.

ALT

M

OD

E

...............

.

.

.

............

.

3-12



SIG

NA

LS

O

U

T&

I

NT

EN

SITY

L

I

M

IT

ER



...

.

. .

.

.

. . .

.



3-51

VER

TICA

L

B

I

NA

RY

...............

. .

.

.

..........

3-13



+

SAWTOOT

H

A

MPL

I

F

I

ER

...

.

.

.........

.... .

.



3-51

1

.

Α

0

RΒ

MODE

........... .

.

.

. .

.

.

..........

3-13



+

GAT

E

A

MPL

I

F

I

ER

.....

.

.

.....

..

.

......

.

.

. . .

.



3-51

2

.

A

L

T

O

R

C

H

O

P

M

OD

E

(

H

O

R

IZ)

:



EN

D O

F

GAT

E

PU

L

S

E

G

ENER

ATO

R

...

.

.

...

.

.

.

3-51

N

O

N

D

E

LAY

E

D

. .

.

.

.............

.

.

. .

.........

3-13



G

RATIC

ULE

I

LLUM

I

N

ATIO

N

. .

.

..

.

.

.....

...

.

.

.



3-51

3

.

A

L

T

O

R

C

H

O

P

M

OD

E

(

H

O

R

IZ)

:



I

NT

EN

SITY

LI

M

IT

ER

. .

.

.

......

.

. .

.

.

...

.

.

...

.

. .

3-52

D

E

LAY

E

D

. .

.

. .

.

. .

.

.

......

.

.

..........

.

.

. .

...

3-13



VER

TICA

L

CHA

NNEL

S

W

ITC

H

.

.

. .

.

.

.....

...

.

.

. . .



3-52

PLUG-IN

BINARY

. .

.

......

.

. .

.

.

..........

.

.

.

....

3-14



C

H

A

NNEL

S

W

ITC

H

.

.

.

......

.

.

......

.

.

...

...

.

.



3-52

VER

TICA

L

C

H

O

PPE

D

BL

ANK

I

N

G

.

.

..........

.

.

. .

3-15



VERTICA

L

CH

A

NNEL

S

ELE

CTO

R

.

..

.

...

.

.

. .

.

.

.



3-52

CHO

P

COUN

T

ER



.........

.

.

..... .

.

.

..........

.

3-17



R

IG

HT A

ND

LE

FT

C

HA

NNEL

FEEDBE

SID

E

...

.

.



3-53

VER

TICA

L

MOD

E

L

OGIC

.....

.

.

...

.

.

..........

.

3-19



VER

TICA

L

A

MPL

IFI

ER

. .

.

.

......

.

.

......

.

.

. .

...

.

.



3-53

T

R

AC

E SEPARATIO

N

.........

.

.

......

.

.

........

3-19



D

E

LAY-

L

I

NE

...

.

.

...

.

.

.........

.

.

...

.

.

. .

.. .

.

.



3-53

S

WEEP

CO

NTR

O

LLE

D

Z-AXIS

Χ

-

Υ

.....

.

.

........

3-20



D

EL

AY-

L

I

NE

COMPEN

SATION

.... .

. .

.

.

...

.

. . .



3-53

T

R

IGGER

SELECTOR

.

.

.

.........

.

.

......

.

.

........

3-22



FEED

BE

SID

E

.

.....

.

.

. .

.

......

.

.

...

.

.

. .

..... . .



3-53

Α

A

N

D

Β

T

RIGGER

CHA

NNEL

S

S

W

ITC

HE

S

.

.....

3-22



O

U

T

PU

T A

MP

LI

F

I

ER

....

.

.

...

.....

.

.

...

.

.

. .

.

.



3-54

Α

T

R

IGG

ER

C

HA

NNEL

S

W

ITC

H

. .

.

.

......

.

.

..

3-22



OU

T

PU

T

PR

OT

E

CTION

. .

.

.

...

.

.

.....

......

.. .



3-54

Α

A

ND

Β

T

R

IGG

ER

A

MP

LI

F

I

ER

......

.

.

...

.

.

.....

3-22



A

U

XILIA

RY

A

M

PL

I

F

I

ER

. .

.

.

...

.

. .

.....

.

.

....

. .



3-54

VER

TICA

L

SIG

N

A

L

O

UTPUT A

MPL

I

F

I

ER

. .

.

. .

.

.

. .

3-22



H

O

R

IZO

N

TA

L

I

NTERF

AC

E

. .

.

.

......

.

.

..... .

.

.

.

. .



3-54

RE

ADO

UT

SYST

EM

(S

NΒ

031766

&B

elow)

.

.

. .

. . . .

3-23



CHANNE

L

S

W

ITC

H

. .

.

...

.

.

......

.

.

......

.

.

.

. .



3-55

DIS

PLAY FO

RM

AT

.

.........

.

.

...

.

.

......

.

.

....

3-23



Χ

-

Υ

D

EL

AY

CO

MPEN

SATION

(OPTION

2)

.

.

.

. .

.



3-55

D

EVEL

O

P

I

N

G

THE

DIS

PL

AY

.

.

.

......

.

.

......

.

.

.

3-25



TIME-BASE

OPERATION

. .

.

.

.....

...

.

.

...

.

.



3-55

TI

MER

.

.

...

.

. .

.

.

. .

.

.........

.

.

...

.

.

.........

...

3-27



Χ

-

Υ

OPERATION

.........

.

.

.....

...

.... . .

.



3-55

TIME-SLOT

CO

UN

T

ER

.

.........

.....

.

.

......

.

.

.

3-29



H

O

R

IZO

N

TAL

A

MPL

I

F

I

ER

.....

.

.

.....

...

.....

.

.

.

.



3-55

W

O

RD TRIGG

ER

....

.

.

.........

.

.

...

.

. .

.

.

......

3-29



I

NPU

T

AMP

LIFI

ER

............

. .

.

.

...

.

.

. .

.

. .

.

.



3-55

C

H

A

NNEL

CO

UN

T

ER

...

.

.

.........

.....

.

.

......

3-30



D

R

I

VER

AMPL

IFI

ERS AN

D

ACTI

VE PE

A

K

I

N

G

.

. .



3-56

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N

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1985

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3-57

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3-57

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3-57

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3-57

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3-57

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3-58

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4-8

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3-58

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.

. .

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.

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...

4-8

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......

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3-58

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TRAN

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. .

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48

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......

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3-58

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3-58

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................

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......

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3-58

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.

. .

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. .

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..........

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.

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LINE

INPUT

......

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.

. .

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......

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......

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......

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3-59

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3-60

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3-62

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PREL

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4-9

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3-62

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......

4-14

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4-14

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4-1

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4-15

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.

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...............

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.....

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V

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......

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......

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4-2

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4-17

S

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......

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......

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4-2

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PER

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......

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......

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......

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....

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......

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......

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......

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......

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......

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4-22

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...................

.

.

......

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......

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.....

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......

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.....

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.........

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.

...

.

.

......

.

.

427

Μ

U

L

Τ

1-

PIN

CO

NNE

CTO

RS

......

.

.

......

.

.

.. .

4-28

PUS

HBUTTON

S

W

ITC

HE

S

....

.

.

......

.

.

......

.

.

4-28

G

RATIC

ULE

LIG

H

T

BULB

S

.

. .

.

.

......

.

.

......

.

.

4-28

PO

WER

TR

AN

S

F

O

RMER

...

.

. .

........

.

.

......

.

.

4-28

L

I

NE

FUSE

................

.

.

.........

.

.

......

.

.

430

AD

JUST

MEN

T

AFT

ER

REP

AI

R

. .

.

.

.........

.

.

...

430

S

E

CTIO

N

6--I

N

ST

RUMEN

T

OPTIO

NS

OPTION

2

. .

.

......

.

.

. .

.

......

.

.

...

.

.

..........

.

6-1

OPTION

3

......

.

.

. .

.

......

.

.

......

.

.

.........

. .

6-1

OPTION

4

......

.

.

.........

.

.

......

.

.

.......

.

.

. .

Ε

r

1

OPTION

13

....

. .

.

......

.

. .

.

.

......

.........

.

.

. .

6

r

1

OPTION

78

.....

.

.

.....

. .

.

.........

.........

.

.

.

.

&-l

OPTION

Α

1

. .

.

. .

.

.

...

.

.

......

.

.

..........

.

.

. .

.

.

.

6-1

OPTION A2

. .

.

.

. .

.

......

.

.

...

.

.

..........

.

.

. .

.

.

.

6-1

OPTION

Α

3

. .

.

.

.........

.

.

.....

..........

.

.

. .

.

.

.6-1

OPTION

Α

4

. .

.

.

........ .

.

.

......

.

.

.......

.

.

. .

...

6-1

OPTION

A5

.

. .

.

......

.

.

.........

.

.

.......

.

.

.

....

6-1

I

N

ST

RUMEN

T

OPTION

ID

EN

TI

F

ICATIO

N

........

.

.

.

.

6-1

S

E

CTIO

N

5--C

HE

C

KS

AND AD

JU

ST

MEN

T



SECTION

7-

REPLAC

E

A

BLE

ELE

CT

R

ICA

L P

A

R

TS

U

SI

N

G

T

HE

SE

PR

OC

E

D

URE

S

.

.

.........

.

.

......

.

5-1

PERF

ORMA

N

C

E

C

HE

C

K S

UMM

A

RY

. .

.

. .

.

.

...

.

.

. .

5-2

AD

JU

ST

MEN

T

I

NT

ERV

AL

.

.

. .

.

.

......

.

.

. .

.

.....

.

5-11

T

EK

T

RON

IX FI

ELD S

ERV

IC

E

.

.

.

......

.

.

........

.

5-11

TEST

EQ

U

I

PMEN

T RE

Q

U

I

RE

D

.....

.

.

......

.

.

. .

.

...

5-11



S

E

CTIO

N

8-DIAG

R

AM

S

A

N

DC

I

R

CU

IT

B

OA

R

D

S

PE

CIA

L FIXT

URE

S

........

.........

.

.

......

.

.

.

5-11



I

LL

U

ST

RATIO

N

S

T

EST

EQ

U

I

PMEN

T

A

L

T

ERN

ATI

VE

S

......

.

.

......

5-11



DIAGRA

M

S

PAR

T

1-PERF

O

RM

A

N

C

E

CHEC

K

. .

.

.

......

.

. .

.

.

......

.

.

.

5-14



I

NT

ER

CO

NNE

CTIN

G

DIAGR

A

M



.

.

. .

.

...

.

. .

.

.

. .

. .

.



1

I

N

D

EX

TO

PERF

O

RM

ANC

E

C

H

EC

K PR

OC

ED

URE

...

5-14



MODE

S

W

ITC

H

,DIS

PL

AY

CO

NTR

OL

&

CALI

BR

ATO

R

2

PERF

O

RMA

N

C

E

C

HE

C

K P

O

WER-UP

SE

Q

UENC

E

.

.

. .

5-14



MAIN INTERFACE



. .

.

......

.

.

.

......

. .

.

. .

.

. .

.

.

.

3

Α

.

Z-AXIS

AND D

I

S

P

LAY

........

.

.

......

.

. .

.

.

.....

.

5-15



L

OGIC

.

. .

......

.

.

. .

. .

.

. .

.

. .

.

......

. .

.

. .

.

.

. .

.

.



4

Β

.

CALI

BRATO

R

AN

D

O

UTPU

T

SIG

NA

L

S

.

. .

.

.

.....

.

5-16



T

R

IGG

ER

SE

LE

CTO

R



. . . .

. .

. .

.

. .

.

. .

...

.

. .

.

.

. .

.

.



5

C

.

TR

IGG

ER

SYST

EM

.....

.

. .

.

.

......

.

.

. .

.

.....

. .

.

.

5-21



RE

ADO

U

T

SYST

EM

(S

Ν Β

031767

& AB

O

VE)

.

.

.

. .

.

.



6

D

.

H

O

R

IZO

N

TA

L

SYST

EM

.

. .

.

.

......

.

.

.........

.

.

.

5-23



R

E

ADO

U

T

SYST

EM

(S

Ν Β

031766

&

BEL

O

W)



.

.

. .

.

.



6

Ε

.

VER

TICA

L

SYST

EM

..........

.

.

......

.

. .

.

.

...

.

. .

5-26



S

I

G

N

A

L

S

O

UT &

I

NT

EN

SITY

L

I

M

IT

ER



.

. .

.

.

. .

.

.

.

. .



7

F

.

READO

UT

SYST

EM

..........

.

.

......

.

. .

.

.

......

5-31

PART

I[-ADJUSTMENT

A

ND

PER

F

O

RM

AN

C

E

CHEC

K

....

.

5-33



VER

TICA

L

C

HA

NNEL

S

W

ITC

H

.

.

.....

. .

. .

.

. .

.

.

.

.

.



$

I

N

D

EX Τ

0

AD

JU

ST

MEN

T

A

N

D

PERF

O

RM

ANC

E



VER

TICA

L

A

MPL

I

F

I

E

R



.

.

. .

. .

.

.

......

. .

.

.

. .

.

.

.

.

.

9

C

HE

C

K PR

OC

E

D

URE

.....

.

. .

.

.

......

.

.

......

.

. .

.

.

.

5-33



HO

R

IZO

N

TA

L

I

NT

ERF

AC

E



.

.

. .

.

. .

.

. .

...

.

.

. .

.

.

.

.

.

10

ADJ

UST

MEN

T

A

N

D

PERF

O

RM

AN

C

E

C

HE

C

K



H

O

R

IZO

N

TA

L

A

MP

LI

F

I

ER

.

.

...

.

.

. .

. .

. .

. .

.

. .

.

.

.

.

.

11

Z-AXIS

SE

Q

UENC

E

........

.

.

......

.

.

. .

.

...

.

.

.

5-34



-

ΑΧΙ

S &

FOC

US

AMPLIFIER



. .

.

. .

.

...

. .

.

.

.

. .

.

.

.

12

HIG

H

-

V

O

L

TAG

E

P

O

W

E

R S

UPPL

Y

&

C

RT

. .

.

.

.

. .

.

.

.

13

Α

.

PO

WER

S

UPPL

Y

.

. .

.

.........

.

.

......

.

.

. .

.

...

.

.

.

5-35



CONVERTER/RECTIFIER



. . . .

. .

.

. .

. .

. .

. .

.

.

.

. .

.

.

.

14

Β

.

Z-AXIS

AND

DIS

P

LAY

........

.

.

......

.

.

. .

.

...

.

.

.

5-38



L

O

W

-

V

O

L

TAGE

REGU

LATO

RS & FAN B

OA

R

D

.

. .

.

.

.

15

C

.

CA

L

I

BR

ATO

R

A

ND

O

UT

PU

T

SIG

N

A

L

S

.....

.

.

....

5-45

D

.

TR

IGG

ER

SYST

EM

.....

.

. .

.

.

......

.

.

......

.

.

....

5-50



S

E

CTIO

N

9-

REP

LACEA

BLE

ME

C

H

A

N

ICA

L P

A

RTS

Ε

.

H

O

R

IZO

N

TA

L

SYST

EM

.......

.

.

......

.

.

. .

.

...

.

.

.

5-55

F

.

VER

TICA

L

SYST

EM

.......

.

.

......

.

.

........

....

5-61

G

.

RE

ADO

UT

SYST

EM

(S

Ν Β

031766

&

BEL

O

W)

. .

.

5-69

G

.

RE

ADO

UT

SYST

EM

(S

Ν Β

031767

&AB

O

VE)

.

.

.

5-72

C

H

A

N

G

E

I

NF

O

RM

ATION

REV

N

O

V

1985

F

igu

r

e



F

igure

No



Page

No



Page

7904

Α

F

eatures

. .

.

......

.

. .

.

.

......

.

.

......

.

.

....

viii



4-1



Color

co

de

for

resistors

and

ca

p

acitors

.

. .

.

.

.....

4-4

1-1



7904

Α

D

i

mensio

n

al

Drawing



. .

.

......

.

.

......

.

.

. .

1-11



4-2



Semiconductor

lea

d

configurations

.

..... .

.

.

.....

4-5

2-1



F

ro

n

t-

p

anel

cont

r

ols,

conn

ectors

and

in

d

icato

r

s

.

. .

. .

2-2



4-3



Orientatio

n of

multi-

p

in

connectors

.

.

.

.

...

.

.

. .

.

. .

4-6

2-2



R

ear-panel

con

trols

and

connectors

.....

.........

.

.

2-4



4-4



Current sensing

waveform

at

A12

R

84

.

.

......

.

.

4-11

2-3



Definitio

n of graticule

meas

u

reme

n

t

lines

. .

.

......

.

.

2-8



4-5



Locat

i

on

of

screws

for

d

isch

arging

line

2-4



L

ocatio

n of

reado

u

t

on

t

h

e

crt

i

d

entifying

the



storage

cap

acitors

...........

. .

.

......

.

.

......

4-11

originating

p

l

u

g-i

n

a

nd

c

h

annel

. .

.

.

. .

.

...

.

.

.......

2-10



4-6



Current

wavefo

r

m

of

Α

23

Τ

30

s

h

owing

burst

2-5



Typical

Setu

p

for

Χ

-

Υ

Displays

with

Ζ

-Axis



operatio

n

at

line

voltage

of

abo

u

t

60

volts

......

4-13

Co

n

tr

ol

from

time-

b

ase

unit

.....

.

.

......

.

.

.......

2-18



4-7



Current

waveform

at

Α

23

Τ

30

for

no

rm

al

inverter

2-6



Ty

p

ical

Χ

-

Υ

Dis

p

lays

wit

hand

without



op

eration

at

line

voltage

of

115

volts

.......

.

.

. .

4-13

Ζ

-Axis

Co

n

trol

.

.

. .

.

.

......

.

. .

.

.

.... .

. .

.

......

.

.

.

2-18



4-8



W

avefor

m

at

1

Ρ

34

on

t

h

e

Α

23

P

ower

Supply

3-1



B

asic

b

lock

d

i

agram

of

t

h

e

7904

Α

Oscillosco

pe

.

.

.

. .

3-2



Inverter

circuit

boar

d

wit h

t

h e

line-voltage

at

3-2



B

rea

kd

own

of

sep

arate

stages

wit

h

i

n

H

orizontal



about 20

volts

... .

.

.

......

.

. .

.

.

......

.

.

......

.

4-13

L

ogic IC

(

U

4428)



.

.

. .

.

.

......

.

. .

.

.

......

.

.

......

.

3-8



4-9



R

eco

m

me

n d

ed

d

esoldering

se

que

n

ce

......

. .

.

.

4-15

3-3



(

Α

)

Diagram

of

cloc

k

generator

stage

;

(

Β

)

Idealize

d

4-10



U

se of

Display

U

nit

k

ic

k

sta

n

d

. .

. .

.

......

.

.

... .

4-16

wa

υ

eforms

for

clock

generator

stage

......

.

.

......

3-16



4-11



P

owe

r

sup

p

ly

u

nit

securi

n

g

screws

.

.

.

......

.

.

.

4-17

3-4



I

d

ealized

waveforms

for

t

he

V

ertical

C

h

oppe

d

4-12



L

ocation

of

securi

n

g

screws

for

t

h

e

A6-Main

B

lan

king

IC

(

U

4320)

.

.

......

.

. .

.

.

...

.

.

......

.

.

...

3-17



Interface

board

.

.

. .

.

............ .

.

.

......

.

.

...

4-20

3-5



(

Α

)

I

np

ut

a

n

d

out

pu

t

pins

for

C

h

o

p

Cou

n

ter

IC,



4-13



Correct p

lacement

of

p

ower

transistor

a

n

d

U

4340

;

(

Β

)

I

dealize

d

wa

υeforms

for

C

ho

p

mounting

h

ar

d

ware on

rear

h

eatsin

k

..

.

......

.

.

4-21

Counter

stage

..........

.

.

. .

.

......

........

.

.

...

3-18



4-14



HYP

CO

N

assembly

removal

an

d

re

p

lace

m

ent

. .

4-24

3-6



Logic

diagra

m

of

V

ertical

M

ode

L

ogic

stage

.

.....

.

.

3-20



4-15



Coaxial

en

d

-lea

d

connector

assembly

.

.

......

. .

4-27

3-7



(

Α

)

L

ogic

diagram

of

Trace

Se

pa

r

atio

n

stage

;



4-16



E

xplo

de

d

view

of

circuit-board

pin

a n

d

(

Β

)

Table

of

inp

u

t/o

u

t

p

ut

combinations

. .

.

.

......

.

.

3-21



fer

r

ule

. .

.

.

. .

.

.............

.

. .

.

.

.

.............

.

4-28

3-8



L

ocatio

n of

rea

d

out

d

is

p

lay

on

the

crt

i

d

entifying



4-17



R

emoval

procedure

for

pus

h

button

switc

h

es

t

he orign

i

ati

ng

plug-in

and

c

h

a

n

n

el

.

. .

.

.

.....

. .

.

. .

3-23



mounte

d

on

t

h

e

Α

5

M

o

de Switch b

oa

rd

.......

.

4-29

3-9



C

h

aracter selection

matrix

for

7904

Α



5-1



Ty

p

ical

d

i

splay

w

h

en

c

hec

k

ing

Χ

-

Υp

hase

R

eadou

t

System



(S

Ν Β

031766

&

Below)

. .

.

......

.

. .

.

3-24



co

m

pensation



.

. .

.

.

.............

.

.

.

...........



5-25

3-10



Ty

p

ical

r

eado

u

t

d

isplay

w

h

ere

only

c

h

annel

2



5-2



R

eadout

display

w

i

t

h

Q2225

remove

d

.

.

........

5-57

(of

the

R

ight

V

ertical

a

n

d

Β

H

orizo

n

tal

un

its)



5-3



Ty

p

ical

d

isplay

w

h

e

n

c

h

ec

k

ing

Χ

-

Υ

ph

ase

is

d

is

p laye

d

.

.

. .

.

......

.

.

........

......

.

.

......

.

.

-25



compe

n

satio

n

. .

.

...

.

. .

.

.

..........

.

.

. .

.

.

.....

5-60

3-11



O

utpu

t

waveforms

of

the

Ti

m

er

stage

......

. .

.

....

3-26



5-4



R

eadout

d

isplay

with

Q2225

re

m

oved

.

. .

.

.

.....

5-70

3-12



Detail

of

out

p

ut at

pins

12, 13,

14

and 16



d

i

agra

m

s

on

t

he

fo

l

do

u

t

p

age

.

of

U2126

.

. .

.

.

. .

.

......

.

. .

.

.

......

.

.

......

.

.

....

3-27



8_1



7904

Α

b

oar

d

locator

drawing

.

3-13



Timer

stage

op

e

r

atio

n

w

hen

d

i

splay-s

k

i

p

8-2



Semico

nd

uctor

lea

d

configurations

.

co

nd

itio

n

occurs

. .

. .

.

.

.........

.

. .

.

.

.....

. .

.

....

3-28



8-3



A5-Mode

Switc

h

circuit

board

asse

m

bly

.

3-14



Timer

relations

h

i

p

of

t

he

time-slot

(TS)

pu

lses



8-4



A2-Display

Control

circuit

b

oard asse

m

bly

.

pro

d

u

ce

d by U2159

.

.

.

. .

.

.........

.

.

......

.

.

....

3-29



8_5



A6-

M

ain Interface

circuit

boar

d

assem

b

ly

.

3-15



Ty

p

ical

encoding

sc

h

eme

fo

r

voltage-se

n

sing

8-6



A13-Logic

unit

.

Co

d ing s

h

own

fo

r

deflectio

n

factor



L

ogic

circ

u

it

b

oar

d

assem

b

ly

.

of

100

mic

r

ovolts

. .

.

......

.

. .

........

.

.

......

...

3-31



8-7



A14-Trigger

Selector

circ

u

it

boar

d

assem

b

ly

.

8-8

A15-Readout

3-16



I

d

ealize

d

current

waveforms

of

(

Α

)

R

ow

analog



System

circuit

board

assem

b

ly

.

d

ata

and

(

Β

)

Colu

m

n

analog

d

ata

.

.

.

........

. .

.

...

3-32



8^9



A27-Readout

P

rotection

circuit

board

assembly

.

8-10



Al-Front

Panel

circuit

boar

d

assem

b

ly

.

3-17



Ty

p

ical

o

u

tput

waveforms

fo

r

Zeros

L

ogic

a n

d

stage

o

p

eratio

n

(at

pin

7

of

U

2232}



. .

.

. .

.

.

3-35



8-11



A16-Vertical

C

h

annel

Switc

h

circuit

board

asse

m

bly

.

M

e

m

ory

-18



R

ead

out

word

relating

10

possi

b

le

c

h

a

r

acter



8-12



A18-Vertical Amplifier

circuit

boa

r

d

assem

b

ly

.

3

to

t

h

ed

ecimal

point

i

n

structio

n

s

t

h

at



8-13



A29-Horizontal

Interface

circuit

boar

d

assembly

.

locations

can be

e

ncoded

;

and

t

h

eresu

ltant

crt

d

isp

l

ay

......

3-36



8

-

14



A17-

Χ

-Y

Delay

Com

p

e

n

sation

(Optio

n

2)

circ

u

it

boar

d

3-19



F

low

ch

art for

c

h

a

r

acter generatio

n

by

t

he R

ea

do

u

t

Sys-



assembly

.

...

.

.

. .

..

.

...

.

. .

.

. .

. .

. .

.

.....

. .

. .

.

. .

.



3_3g



8-15



A28-Horizontal

A

m

plifier

circuit

b

oar

d assembly

.

tem

8-16



A21-

Ζ

-Axis

circuit

boar

d

assem

b

ly

.

3-20



Character

selectio

n

m

atrix

for

7904

ΑR

eado

u

t

System



8-17



A20-High

V

oltage

circuit

b

oar

d

asse

m

bly

.

(S

Ν Β

031767

&

A

b

ove)

.. . . .

.

. .

.

......

. .

.

.

. .

.



3-40



8-18



A23-Power

Supply

circuit

boar

dassembly

.

3-21



Detailed

bloc

k d

iagram

of

t

h

e

R

ea

d

out

System



8-19



A12-Control

R

ectifie

r

c

i

rcuit

boar

d

assem

b

ly

.

(S

Ν Β

031767

&

Above)

. .

.

...

.

.

. .

. .

.

...

.

. .

.

.

.

3-42



8-20



A22-Low

V

oltage

circuit

b

oard

assem

b

ly

.

3-22



Develo

p

i

n

g

α

ty

p

ical

c

h

a

r

acter

on

t

h

e

CRT

.

.....

3-49



8-21



All-Fan

circ

u

it

b

oar

d

assem

b

ly

.

3-23



Detailed

bloc

kd

iagram

of

t

h

e

Converter/

Rectifiers

cir-



8-22



Test

P

oint

and

A

d

j

ust

m

ent

L

ocations

Α

.

cuit

. .

.

. .

. .

. .

.

. .

.

.........

.

...

.

...

.

.......

3-59



8-23



Test

P

oint

a

n

d

Ad

j

ustment

L

ocatio

ns

Β

.

3-24



(

Α

)

R

epresentation

of

I

n

verter

stage

.

I

d

ealized



8-24



A

d

j

ustment

L

ocations

C

.

waveforms

of

(

Β

)

total

Inverter

curre

n

t,

IT,



8-25



A

d

j

ustment L

ocatio

n

s

D

.

{C}

V

oltage

ac

r

oss

CR41

an

d

(D)

V

oltage



8&-26



Test

P

oint a

nd

Ad

ju

stment

L

ocations

Ε

.

ac

r

oss

primaries

of

Τ

110 and

Τ

35

......

.

..

.

.

. .

.

3-61



8-27



Test

P

oi

n

t

an

d

A

d

justment

L

ocations

F

.

8-28



Test

P

oint

a

nd

A

dju

stment

L

ocations

G

.

REV

N

O

V

1985

L

IST

O

F

I

LLU

ST

RATIO

N

S

7904

Α

I

n

st

r

u

ctio

n

7904

Α

I

n

str

u

ctio

n

Tab

le

No



P

age

1-1



Power-Cord

Color

Conductor

I

de

n

tification

. .

.

......

1-2

1-2



Power-Cor

d

an

d

P

lug

I

den

tificatio

n

Informat

i

on

.

. .

.

.1-2

1-3



Electrical

Characteristics

.

.

.........

.

.

......

.

.

.....

1-4

1-4



En

vi

r

o

nm

ental

C

h

aracteristics

.

. .

.

.

...

.

. .

.

.

......

.

.

1-9

1-5



Ph

ysical

C

h

aracteristics

. .

.

. .

.

......

.

.

......

.

.

....

1-10

1-6



Plug-in

Inco

m

pati

b

ilities

.

.

........

. .

.

......

.

.

... .

1-12

1-7



7904

Α

Osci

l

losco

pe

V

ertical

System

S

p

ecification

.......

.

. .

.

.

. .

.

.....

.........

.

.

...

.1-13

1-8



7904

Α

Oscillosco

pe

H

orizontal

System

S

p

ecificatio

n

.......

.

. .

.

.

. .

.

.....

.........

.

.

...

.1-14

1-9



S

p

ecial

Pur

p

ose

Plug-in

U

nits

.

. .

.

.

...

.

. .

.

.

......

.

1-14

2-1



Display

Com

b

inations

.

. .

.

.........

.

.

......

.

.

....

2-11

3-1



Basic

L

ogic

Sym

b

ols

.

. .

.

.

. .

.

......

.

.

......

.

.

.....

3-4

3-2



M

o

de

Switc

h

ing

I

np

uts/Out

p

ut

.

.........

.

.

......

.

.

3-7

3-3



I

np

ut/Output

Co

m

binations

for

Α

L

oc

k

out

(

U

4428

Pin

14)



. .

.

.

. .

.

.........

.

.

......

.

.

......

.

.

3-9

3-4



Input/Out

p

ut

Combi

n

atio

n

s

for

Β

L

oc

k

out

(

U

4428

P

in

15)



. .

.

.

........... .

.

.

......

.

.

......

.

.

3-9

3-5



Inp

u

t/O

u

t

pu

t

Co

mb

i

n

atio

ns

for

Alternate

Pulse

(

U

4428

P

i

n

8)

.

. .

.

.

............

.

.

......

.

.

......

.3-10

3-6



I

np

ut/Out

p

ut

Comb

i

nations

for

t

he

Ζ

-Axis

Logic

Stage

...........

.

.

.........

.

.

......

.

.

...

.3-12

3-7



In

pu

t/O

u

t

p

ut

Combi

n

ations

of

t

h

e

H

orizontal

B

i

n

ary

Stage

.......

.

. .

.

.

. .

.

......

.

.

......

.

.

...

.3-12

3-8



In

p

ut/Out

p

ut

Com

b

inations

for

the

V

ertica

l

B

inary

Stage

.......

.

. .

.

. .

.

.

......

.

.

......

.

.

...

.3-14

V

1

L

IST

O

F

TA

BLE

S

Ta

b

le

No



P

age

3-9



In

p

ut/Out

put

Combinations

for

t

h

e

Plug-In

B

inary

Stage

.

.

. .

.

...

. .

.

.

. .

.

...

.

. .

. .

.

.

.....

3-15

3-10



Input/Output

Comb

i

nations

for

t

h

e

V

e

r

tical

C

hop

p

ed B

lan

k

ing

Stage

.

. .

.

.

......

. .

.

..

. . . .

3-17

3-11



Standard

R

ea

d

out

Fo

rm

at

. .

.

.

...

.

..

. .

.

.

.....

3-25

3-12



C

hann

el

A

dd

r

ess

Code

(S

N

8031766

&B

elow)

. . .

3-30

3-13



C

han

nel

Address

Co

d

e (S

Ν

Β

031767

&

Above)

. .

3-45

3-14



Inp

u

t/Out

put

Relationships

for

t

h e

Auto-

F

oc

us

C

h

annel

Switc

h

.

.

. .

. .

. .

.

. .

.

.

......

. .

.

.

.....

3-57

4-1



R

elative

Susce

p

t

i

b

ility

To

Static

Disc

h

arge

Damage

.

. .

.

.

......

.

.

. .

.

......

.

.

. .

.

......

.....

.

.4-6

4-2



R

ecommen

d

e

d P

owe

r

Supp

ly

Troub

les

h

ooting

Sequence

.

. .

.

.........

.

.

......

.

.

......

.

. .

.

.

...

.

.

4-9

43



Ty

p

ical

Powe

r

-Sup

p

ly

R

esistance

...

.

.

......

.

. .

. 1

.4-10

4-4



B

urst

V

oltage

Test

Points

.....

.

.

......

.

.

.... .

....

411

5-1



C

hec

ks

and

A

d

j

u

st

m

en

t

Proce

d

ure

Electives

....

.

.

. .

5-1

5-2



Pe

r

forma

nce

C

hec

k

Su

m

mary

.

.

.

. .

.

...

.

.

......

.

.

. .

5-2

5-3



Test

Eq

ui

pm

ent

...

.

. .

.

.

......

.

.

......

.

.

......

.

.

.

5-11

5-4



Power

S

u

pply

Tolerances

.....

.

.

. .

.

...

.

.

......

.

.

.

.

-37

5-5



T

h

e

r

ma

l

Com

p

ensation

A

dj

ustments

...

.

.

......

.

.

.

5-63

5-6

Α



R

i

ght

C

h

annel-Switc

h

Com

p

e

n

sation

(Signal

R

e

p

R

ate

vs

:

Swee

p

R

ate)

...

.

.

...

.

.

.....

......

.

. .

5-64

5-6

Β



L

eft

Cha

nn

el-Switc

h

Co

m

p

ensation

(Sig

n

al

R

ep

R

ate υs

:

Swee

p

R

ate)

.

.

......

.

.

......

.

.

......

5-64

5-7



H

ig

h

-

F

re

q

uency Compensatio

n

A

d

j

ust

m

ent

.....

.

.

.

5-65

6-1



O

p

tion

Information

L

ocato

r

......

.

.

.....

......

.

. .

.

6-2

REV

N

O

V

1985

O

PER

ATO

R

S

SA

FE

TY

S

UMM

A

R

Y

T

h

e

ge

n

eral

safety

information

i

n

t

h

is

p

art

of

t

h

esu

mmary

is

for

b

ot

h

operati

n

g a

nd

servicing

personn

el

.

S

p

ecific

war

n

i

n

gs an

d

cautions

will

be foun

d

t

h

roug

h

o

u

t t

h

e

manual

w

h

ere

t

h

ey

apply,

bu

t

may

not

a

pp

ear

i

n

t

h

is

su

m

mary

.

T

ERM

S



W

A

RN

I

N

GS

IN

T

H

IS

M

A

NU

A

L



P

O

WER SO

UR

C

E

CA

U

TIO

N

statements

ide

n

tify

co

nd

itions

or

p

ractices



T

h

is

p

ro

d

uct

is

intende

d

to

o

p

erate

from

α

power

source

t

h

at

co

u

l

d

res

u

lt

in

d

amage

to

t

h

ee

q

ui

p

me

n

t

or ot

h

e

r

that

will

n

ot

apply

more

t

h

a

n

250

volts

r

m

sb

etween

t

h

e

p

ro

p

erty

.



su

pp

ly

conductors

or

between

eit

h

e

r

su

pp

l

y

cond

u

ctor

a

nd

gro

u

nd

.

Α

p

rotective

gro

u

nd

co

nn

ection,

by

way

o

f

WA

RN

I

N

G

stateme

n

ts

ide

n

tify

co

n

ditions

or

p

ractices



t

h

e

groundi

n

g

co

nd

uctor

i

n

t

h

e

p

ower

cor

d

is

esse

n

tial

t

h

at

coul

d

res

u

lt

i

n

p

ersonal

i

nju

ry

or loss of

li

f

e

.



for

safe operatio

n

.

T

h

is

sym

b

ol

i

n

dicates

w

h

ere

ap

p

lica

b

le

cautio

n

ary or

ot

h

er

information

is

to

b

e

fo

u

n

d

.

G

R

O

UN

DI

N

G

THE

PR

OD

U

CT

AS

M

A

RKE

D

ON

E

Q

U

I

PMEN

T



T

h

is

p

ro

d

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7904

Α

I

n

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7904A

FEATURES

4593-3

Th

e

T

EK

T

R

O

N

IX

7904

Α

Oscillosco

p

e

is

α

soli

d

-state,

h

ig

h p

erfor

m

a

n

ce

(500

MH

z

vertical

b

a

n

dwi

d

t

h

)

instrument

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esigned

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r

general

p

ur

p

ose

a

p

plications

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T

he

7904

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acce

p

ts

four

7000-series

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n

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its

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form

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h

ig

h

ly

flexible

oscilloscope

system

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h

e

left

pair

of plug-in

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p

artments

are

for

vertical

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eflection

an

d

t

h

e

right

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air

of

pl

u

g-in

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tal

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lectronic

switc

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ing b

etween

eac

h

d

eflectio

n

system

allows

d

ual-trace

vertical

an

d

d

ual-sweep

h

orizon

tal di

sp

la

y

s

.

T

h

e

7904

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features

incl

u

de

an

8

cm

χ

10

cm

crt

d

is

p

lay

area

w

i

t

h

α

crt

readout

display

of

al

p

ha

n

u

meric

characters

from

the associate

d

plug-in

units

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he

readout

dis

p

lay

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deflectio

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factor,

sweep

rate,

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other

enco

ded

p

arameters

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T

he ab

ove

d

elaye

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-swee

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dis

play

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e

d u

sing

α

7

Βθ

2

Α

Dual

Time

B

ase

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An

11

m

ega

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ertz

sine-wave

signal

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applie

d

simulta

n

eously

to

t

h

e

7

Α

29

Inp

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t

an

d

to

t

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7D15

F

r

eq

In

connectors

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in

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cy

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pd

ate

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on

the

7904

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crt

rea

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dis

p

lay

.

T

h

e

7

Α

26

Du

al

Trace

Am

p

lifier

p

rovi

d

es

additional

vertical

d

isplay

ca

p

abilities

w

h

e

n

selected

.

ΥΙΙΙ