Tektronix 7B53N Manuale utente

TABLE

CONTENTS

Introduction

Simplified

Block

Diagram

Discussion

Main

Sweep

Mode

Delayed

Sweep

Mode

Mixed

Sweep

Mode

3-1

3-3

7B53N

Abbreviations

and

symbols

used

this

manual

are

based

on or

taken

directly

from IEEE

Standard

260

"Standard

Symbols

for

Units",

MIL

STD-12B,

and

other

standards

the

electronics

industry

SECTION

SPECIFICATION

Page

SECTION 3

CIRCUIT

DESCRIPTION

(cont)

Page

Introduction

1-1

Circuit

Operation

3-3

Table

1-1

Electrical

1-1

General

Main

Trigger

Preamp

3-3

3-4

Main

Sweep

Triggering

1-1

Main

Trigger

Generator

3-5

Delayed

Sweep

Triggering 1-3

Main

Sweep

Generator

3-8

Main

Sweep

Generator

1-4

Delayed

Trigger

Preamp

3-11

Delayed

Sweep

Generator

1-4

Delayed

Trigger

Generator

3-12

Mixed

Sweep,

Variable

Time

Delay

1-5

Delayed

Sweep

Generator

3-13

Amplifier

Output

Signals 1-5

1-6

Horizontal

Preamp

3-16

Table

1-2

Environmental

Characteristics

1-7

SECTION 4

MAINTENANCE

Table

1-3

Physical

1-7

Introduction

4-1

SECTION

OPERATING

INSTRUCTIONS

Preventive

Maintenance

4-1

Troubleshooting

4-2

General

2-1

Corrective

Maintenance

4-6

Installation 2-1

Controls

and

Connectors

2-2

SECTION

CALIBRATION

General

2-2

Main

Triggering

Controls

2-2

Introduction

5-1

Sweep

Controls

2-4

Tektronix

Field

Service

5-1

Delayed

Trigger

Controls

2-4

Using

This

Procedure

5-1

Front-Panel

Connectors

2-5

Test

Equipment

Required

5-1

Sweep

Calibration

2-6

Preliminary

Control

Settings

5-2

Simplified

Operating

Instructions

2-6

Part

Performance

Check

5-4

Main

Sweep

2-6

Index

to Part

I-Performance

Check

5-4

Magnified

Display

2-6

Preliminary

Procedure

for

Delayed

Sweep

Display

2-6

Performance

Check

5-4

Mixed

Sweep

Display

2-7 Trigger

System

Check

5-5

General

Operating

Instructions

2-7

Horizontal

System

Check

5-11

Pushbutton Switch

Logic

2-7

Output

Signals

Check

5-17

Triggered

Light

2-7

Part

Adjustment

5-18

Main

Trigger

Mode

2-7

Index

Part

11-Adjustment

5-18

Main

Trigger

Coupling 2-8

Preliminary

Adjustment

Procedure

5-18

Main

Trigger

Source

2-9

Trigger

System

Adjustment

5-19

Main

Trigger

Slope

2-10

Horizontal

System

Adjustment

5-25

Main

Trigger

Level

2-10

Output

Signals

5-29

Selecting

Sweep

Rates

2-10

Time

Measurement

2-10

SECTION

ELECTRICAL

PARTS

LIST

Sweep

Magnifier

2-12 Abbreviation

and

Symbols

Main

Sweep

Operation

2-12

Parts

Ordering Information

Delayed

Sweep

Operation

2-12

Index

Electrical

Parts

List

MixedSweep

Operation

2-13

Electrical

Parts

List

Delayed

Sweep

Triggering

2-13

Delayed

Gate

Output

2-14

SECTION

DIAGRAMS

AND

CIRCUIT

BOARD

Applications

2-14

ILLUSTRATIONS

General

2-14

Comparison

Measurement

Symbols

and

Reference

Designators

7-1

Techniques

2-14

Diagrams

Time

Duration

Measurements

2-15

Circuit

Board

Illustrations

Determining

Frequency

2-16

Risetime

Measurements

2-16

SECTION 8

MECHANICAL

PARTS

LIST

Delayed

Sweep

Measurements

2-17

Mechanical

Parts

List

Information

Delayed

Sweep

Magnification

2-18

Index

Mechanical

Parts

List

Triggered

Delayed

Sweep

and

Illustrations

Magnification

2-19

Mechanical

Parts

List

Pulse

Jitter

Measurements

2-19

Accessories

SECTION 3

CIRCUIT DESCRIPTION

Introduction

The

7B53N

dual

time

base unit

designed

for use

Tektronix

7000-Series

Oscilloscopes

without

readout

system

;

however

it is

compatible

with

all

7000-Series

Oscilloscopes

The

7B53N

features

calibrated

sweeps

from

seconds/division

nanoseconds/division

with

X10

magnification)

The

Main

Delayed

sweep

rates

may

varied

continuously

(uncali-

brated)

between

calibrated

steps

Sweep

triggering

pro-

vided

at least

100

megahertz,

Separate

trigger

controls

are

provided

select

the

desired

triggering

for

the

main

and

delayed

sweeps

SECTION

SPECIFICATION

TABLE

1-1

ELECTRICAL

MAIN

SWEEP TRIGGERING

7B53N

Four

display

modes

are

provided

These

include

separate

display

the

main

sweep,

intensified

display,

delayed

sweep,

and

mixed

sweep

The

7B53N

can

also

used

amplifier

for

X-Y

operation

This

instrument

will

meet

the

electrical

characteristics

listed

under

Performance

Requirement

Table

1-1, fol-

lowing

complete

calibration

The

following

electrical

char-

acteristics

apply

over an

ambient

temperature

range

+50

except

otherwise

indicated

Warmup

time

for

given

accuracy

minutes

Characteristic

Performance

Requirement

Supplemental

Information

Source

Internal

from

associated

vertical

unit

Selected

SOURCE

switch

Internal

from

power

source

External

divide

ten

Coupling

Selected

COUPLING

switch

low-frequency

reject

high-frequency

reject

Polarity

Sweep

can

triggered

from

positive-

Selected

LEVEL/SLOPE

control

going

negative-going

portion

trigger

signal

Internal

Trigger

Sensitivity

division

deflection,

minimum, 30

The

specified

upper

-3

frequency

hertz

to 10

megahertz

;

increasing

the

vertical

system

supersedes

the

divisions

100

megahertz

frequency

limits

given

the

Internal

Trigger

Sensitivity

table

when

the

number

the

table

greater

than

the

upper

-3

frequency

the

vertical

unit

Specification-7B53N

Performance

Requirement

division

deflection,

minimum,

kilohertz

megahertz

;

increasing

divisions

100

megahertz

division

deflection,

minimum,

hertz

kilohertz

division

deflection,

minimum,

to 10

megahertz

;

increasing

divi-

sion

100

megahertz

100

millivolts,

minimum,

hertz

megahertz

;

increasing

500

millivolts

100

megahertz

100

millivolts,

minimum,

150

kilohertz

10 megahertz

;

increasing

500

milli-

volts

100

megahertz

100

millivolts,

minimum,

hertz

kilohertz

100

millivolts,

minimum,

mega-

hertz

;

increasing

500

millivolts

100

megahertz

Stable

display

presented

with

signal

amplitudes

given

under

Internal

and Ex-

ternal

Trigger

Sensitivity

above

hertz

Presents

free-running

sweep

for

lower

frequencies

absence

trigger

signal

Main

Sweep

Generator

produces

only

one

sweep

when

triggered

Further

sweeps

are

locked

out

until

RESET

button

pressed

Trigger

sensitivity

same

given

for

internal

and

external

sensitivity

nanosecond

less

75 megahertz

REJ

External

Trigger

Sensitivity

REJ

Auto

Triggering

Single

Sweep

Characteristic

Internal

Trigger

Jitter

External

Trigger

Input

and

Maximum

Safe

Input

Voltage

TABLE

1-1

(cont)

Supplemental

Information

SOURCE

switch

set

EXT

Trig-

gering

signal

requirements

increased

times

for

EXT=10

position

Approximately

megohm

paralleled

by 20 pF

500

volts

(DC

Peak

AC)

500

volts

peak-to-peak

kilohertz

less

Level

Range

EXT

TABLE

1-1

(cont)

Characteristic



Performance

Requirement

EXT

least

+and

-1

volts

least

+ and

-15

volts

DELAYED

SWEEP TRIGGERING

Specification-71353N

Supplemental

Information

Source

Internal

from

associated

vertical

unit

Selected

Delayed

Triggering

SOURCE

switch

External

Coupling

Selected

Delayed

Triggering

COUPLING

switch

Polarity

Sweep

can be

triggered

from

positive-

Selected

Delayed

Triggering

SLOPE

going

negative-going

portion

trigger

switch

signal

Internal

Trigger

Sensitivity

division

deflection,

minimum, 30

hertz

10 megahertz

;

increasing

divisions

100 megahertz

division

deflection,

minimum,

megahertz,

increasing

divi-

sions

100

megahertz

External

Trigger

Sensitivity

100

millivolts,

minimum, 30

hertz

10 Delayed

Triggering

SOURCE

switch

megahertz

;

increasing

500

millivolts

set

EXT

100

megahertz

100

millivolts,

minimum,

mega-

hertz

;

increasing

500

millivolts

100

megahertz

Internal

Trigger

Jitter

nanosecond

less

megahertz

External

Trigger

Input

Maximum

Safe

Input

Voltage

500

volts

(DC

Peak

AC)

500

volts

peak-to-peak

kilohertz

less

Input

and

megohm

paralleled

by 20

picofarads

Level

Range

least

+and

-1

volts

Specification-71353N

TABLE

1-1

(cont)

MAIN

SWEEP

GENERATOR

DELAYED

SWEEP

GENERATOR

Characteristic

Performance

Requirement

Supplemental

Information

Sweep

Accuracy

Measured

7400-

and

7500-Series

Oscilloscopes

Time

Interval

+15

+35

0°

+50

Over

Center

Divisions

Unmagnified

Magnified

Unmagnified

Magnified

milliseconds/division

Within

.5%

Within

microsecond/division

seconds/division to

second/division

and

Within

3.5%

Within

microsecond/division

.05

microsecond/division

Sweep

Linearity

Over

any

division

portion

with-

center

eight

divisions

(all

Within

sweep

rates)

VARIABLE

Sweep

Rate

Range

Continuously

variable

between

calibrated

Extends

sweep

rate

to at least

sweep

rates

seconds/division

VARIABLE

control

internally

switchable

between

Main

and

Delayed

Sweeps

Sweep

Hold-Off

Time

seconds/division

10 micro-

times

the

TIM

E/D

setting

less

seconds/division

microseconds/division

microseconds

less

microsecond/division

Normal-Mag

Registration

Within

division

Sweep

Accuracy

Time

Interval

Measured

Oscilloscopes

+15

7400-Series

+35

7500-Series

Over

Center

Divisions

Unmagnified

Magnified

Unmagnified

Magnified

milliseconds/division

Within

3.5%

Within

microsecond/division

second/division

and

Within

.5%

Within

microsecond/division

Within

± measured

Main

Sweep

error

Within

.2%

full

scale

minor

divi-

sion)

Less

than

part

20,000

of the maxi-

mum

available

delay

time (10 times

the

Main

Sweep

TIME/DIV

switch

setting)

Sweep

Accuracy

DELAY

TIME

MULT

Delay

Accuracy

over

center

eight

divisions

seconds/division to

second/division

microsecond/division

Multiplier

Linearity

Delay

Time

Jitter

TABLE

1-1

(cont)

MIXED

SWEEP,

VARIABLE

TIME

DELAY

AMPLIFIER

Specification-71353N

Exclude

the following

portions

Mixed

Sweep

First

division

after

start

MAIN

sweep

display

and

division

microsecond

(whichever

greater)

after

transition

MAIN

DLY'D

sweep

millivolts/division

within

10%

100

mill

ivolts/division

within

10%

volt/division

within

10%

Deflection

Factor

EXT,

MAG

X10

EXT,

MAG

off

EXT=

10,

MAG

off

Characteristic

Performance

Requirement

Supplemental

Information

Sweep

Linearity

Over

any

division

portion

with-

center

eight

divisions

(all

Within

sweep

rates)

VARIABLE

Sweep

Rate

Range

Continuously

variable

between

calibrated

Extends

sweep

rate

at least

.25

sweep

rates

seconds/division

VARIABLE

control

internally

switchable

between

Main

and Delayed

Sweeps

Sweep

Hold-Off

Time

Determined

the

Main

Sweep

TIME/

DIV

setting

Specification-71353N

Performance

Requirement

Characteristic

TABLE

1-1

(cont)

OUTPUT

SIGNALS

Supplemental

Information

Delayed

Sweep

Gate

Available

front-panel

DLY'D

TRIG

IN connector

when

operating

Waveshape

Rectangular

pulse

delayed

sweep

mode

with

the Delayed

Triggering

SOURCE

switch

set

INT

Amplitude

volts

within

40°%

with

baseline

-1

volt

Polarity

Positive-going

Duration

For

the

time

the

delayed

sweep

Output

Resistance

Approximately

kilohm

least

kilohms

shunted

100

picofarads

less

Composite

Sweep

Gate

Coupled

associated

indicator

oscilloscope

way

In-

Waveshape

Rectangular

pulse

terface

circuit

board

Polarity

Positive-going

Duration

DISPLAY

MODE

MAIN

SWP

Coincident

with

the

main

sweep

interval

INTEN

Coincident

with

the

main

sweep

interval

DLY'D

SWP

Coincident

with

the

delayed

sweep

in-

terval

MIXED

Coincident

with

the

main

sweep

interval

plus

the

delayed

sweep

interval

Nominal

Frequency

Response

System

-3 dB

points

7400-Series

7500-Series

Oscilloscope

Lower

-3

hertz

Upper

-3

2 megahertz

REJ

kilohertz

2megahertz

AC HF

REJ

hertz

100

kilohertz

DC DC

2 megahertz

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