Tektronix 7B51 Bedienungsanleitung

C·

INSTRUCTION

MANUAL

Tektronix,

Inc

TYPE

7851

DEI.AYING

TIME-BASE

S,W.

Millikan

Way

. P. O. Box

500

• BeaYerton,

Oregon

97005

• Phone

644

-0161 • Cables: Tektronix

070

097

6.00

869

Scans

Arlel.Media

Artek Media

1042

mme

Cir

. SW

Rochester,

55902

www.artekmedia.com

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WARRANTY

All

Tektronix ,instruments

are

warranted

against

defective materials

and

workman-

ship for

(>ne

year. Tektronix transformers,

manufactured

our

plant,

are

warranted

for the life of

the

instrument.

Any questions with respect to 'the war-

ranty mentioned Qbove should

taken

with

your

Tektronix Field Engineer.

Tektro,"ix repa,ir

and

repla<;~m1/lnt.Pdrt

servke

geared

directly to.;

th~fj~ld,

th~refore

all requests for repoirs

ond

re-

placement

parts$hould

directed

the

Tektronix Field Office

representative

your

area.

This

procedure will assure

you the fastest possible service. Please

include

the

instrument Type

and

Serial or

Model Number with all requests for parts

service.

Specifications

and

price

change

privi-

leges reserved.

1969

by Tektronix, Inc.,

Beaverton,

Oregon.

Printed

the

United

States of America.

All

rights reserved.

Contents

this publication

may

not

reproduced

ony

form without permis-

sion

the

owner.

TABLE

CONTENTS

SECTION 1

SECTION 2

SPECIFICATION

Introduction

Electrical Characteristics

Sweep Rate

Sweep Accuracy

Sweep

length

Sweep Hold-Off Time

Delay Time Multiplier

Range

Accuracy

linearity

Delay

Jitter

Trigger Sensitivity

Internal Trigger

Jitter

External Trigger Input

level Range

Bright Baseline

POp

Auto Sensitivity

Environmental Characteristics

Altitude

Transportation

Physical Characteristics

Finish

Weight

Dimensions

OPERATING INSTRUCTIONS

General

Installation

Front

Panel Controls and Connectors

Test Setup Chart

General Operating Information

Sweep Calibration Check

Simplified Operating Instructions

Normal Sweep

Magnified Sweep

Delayed Sweep

Pushbutton Switch

logic

Triggered

light

Trigger Mode

Trigger Coupling

Trigger Source

Trigger Slope

Trigger level

Horizontal Sweep Rate

Sweep Magnifier

Horizontal Position Control

Applications

Measurement Techniques

Time Duration Measurements

Page

1-1

1-2

2-1

2-4

2-6

2-7

2-9

2-10

2-12

2-13

2-14

Type 7B51

SECTION 3

SECTION 4

TABLE

CONTENTS

Determining Frequency

Risetime Measurements

Delayed Sweep Time Measurements

Delayed Sweep Magnification

Pulse

Jitter

Measurements

CIRCUIT DESCRIPTION

Introduction

Block Diagram Description

Detailed Circuit Description

Trigger Preamp and Input Switching

Trigger Generator

Input Stage

P-P

Auto Stage

Slope Comparator

Trigger TO Stage

Pulse Amplifier

Sweep Gate Stage

Bright Line Auto

Sweep Generator

Disconnect Amplifier

Sawtooth Generator

Sweep

Start

Amplifier

Sweep

Stop

Comparator

Holdoff Capacitor and Amplifier

Sweep Holdoff Multivibrator

Reset Control Amplifier

Sweep Reset Multivibrator

Single Sweep Operation

Alternate Operation

Delayed Sweep Operation

Delay Pickoff Circuit

Horizontal Preamp

Readout Block

MAINTENANCE

Preventive Maintenance

General

Cleaning

Transistor Checks

Recalibration

Troubleshooting

Troubleshooting Aids

Troubleshooting Equipment

Troubleshooting Techniques

Corrective Maintenance

Obtaining Replacement Parts

Soldering Techniques

Component Replacement

cont

2-14

2-15

2-16

2-17

2-18

3-1

3-3

3-6

3-7

3-9

3-10

3-11

3-12

4-1

4-2

4-~

4-2

4-6

4-7

SECTION 5

SECTION 6

SECTION 7

SECTION 8

TABLE

CONTENTS

PERFORMANCE CHECK/CALIBRATION

Introduction

Test Equipment Required

Short

Form Procedure

Performance Check/Calibration Procedure

General

Preliminary Control Settings

Check

Adjust

Level

Center

P-P

Auto

Level

Range

Internal Trigger Centering

Level/Slope Range

Trigger Bandwidth

External Trigger Input Compensation

Sweep

Jitter

Trigger Modes

Sweep Calibration

Magnified Sweep Gain

Magnifier Registration

Sweep Length

Variable Time/Div Range

5fJ.s Timing

0.2

fJ.s

Timing

Sweep Timing Accuracy

Magnified Sweep Timing

Sweep Inhibit

Delay

Start

(R590) and Delay

Stop

(R500)

Delay Time Accuracy

Delay Time

Jitter

Line Trigger Source

ELECTRICAL PARTS LIST

Abbreviations and Symbols

Parts Ordering Information

Index

Electrical Parts List

cont

DIAGRAMS AND MECHANICAL PARTS ILLUSTRATIONS

Diagrams

Mechanical Parts Illustrations (on reverse side

Diagrams)

MECHANICAL PARTS LIST

Mechanical Parts List Information

Index

Mechanical Parts Illustrations

Mechanical Parts List

Accessories

5-1

5-2

5-4

5-5

5-6

5-7

5-8

5-9

5-10

5-11

5-.12

5-13

5-14

Abbreviations and symbols used

this manual are based on

taken directly from IEEE

Standard

260

"Standard

Symbols for Units",

MIL

STD-12B and

other

standards

the

electronics industry. Change information, if any,

located

the rear

this manual.

-----~------------~-----~----

Type 7B51

iii

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• • •

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• • •

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ElAVING

TIMI.

....

Type 7851

<ill

Type

7B51

SECTION

SPECIFICA

TION

Change

information,

any,

affecting

this section

will

found

the rear

the manual.

Introduction

The

Type

7B51 Time Base Unit

designed specifically

for use with

Tektronix

Type

7500-Series Oscilloscopes.

However, it

compatible

with all 7000-Series Oscillo-

scopes. The

Type

7B51 provides calibrated sweeps from 5

seconds/division

0.05

microsecond/divisions (5 nano-

seconds/division

with

X10

MAGNIFIER). Sweep rates

may

be varied

continuously

(uncalibratedl between calibrated

steps. Sweep triggering

100

megahertz

vertical

amplifier

bandwidth,

whichever

less. The delaying sweep

feature of

the

Type

7B51,

delayed sweep

operation,

gives

continuous

sweep delay from 0

times

the

setting

the

TIME/DIV OR

Y TIME selector. The sweep free-

runs, providing a bright base line

the

absence

adequate

triggering signal

P-P

AUTO and AUTO triggering modes.

The Performance Check procedure given

Section 5

provides a

convenient

method

checking performance

this instrument.

The

following electrical characteristics

apply

ambient

temperature

O°C

+50°C, unless

otherwise

noted.

Warmup time for given accuracy

minutes.

TABLE

1-1

ELECTRICAL CHARACTERISTICS

Characteristic Performance Characteristic Performance

-- _

...

Sweep Rate Over any 2 div

Calibrated Range 5 seconds/division

0.05

micro- interval within

second/division in a 1-2-5 sequence.

center

8 div

magnifier

extends

sweep rate

5 nanoseconds/division. Exclude following

Start

Sweep End

Sweep

portions

Magni- first

beyond

the

VARIABLE

Continuously

variable between cali- fied Sweep

100th

div

Range (uncali-

brated

sweep rates.

Extends

uncali-

bratedl bra

ted

sweep rate

least 12.5 Sweep Length 10 divisions

13 divisions

seconds/division. Sweep Hold-Off

Time

5 s/Div

1.5 times

the

TIME/DIV setting

Sweep Accuracy Measured

7500

series mainframe 5

]..ls/Div

less.

Calibrated

with

mainframe calibra- 2

]..ls/Div

3.5

microseconds

less.

tor.

0.05

]..ls/Div

+15°C

+35°C

O°C

+50

Time Interval DELAY TIME o

times TIME/DIV setting

Over Center Unmag

Mag

Unmag

Mag

8 div

MULTIPLIER

Range

5 s/div

0.1 3% 3.5%

5% Accuracy

s/div and

0.2

5 seconds/division Within

]..ls/div

0.05

1 second/divi-

]..ls/div

sion

.5 milliseconds/ Within

ms/div

2.5% 3%

division

1 micro-

0.5

]..ls/div

second/division

,-,

Specification-

Type

7B51

Characteristic Performance

Multiplier Accuracy Within 0.2%

Differential

Time

Within

and 2

minor

divisions

for

Measurement delay times 1 llS

0.5

Accuracy Within

and 2

minor

divisions

for

delay times 1 s

5 s

Jitter

part

less in

50,000,

times

the

TIME/DIV setting

Trigger Sensitivity Minimum

Triggering Triggering

Frequency

Signal

Rangel Required

Coupling INT EXT

Hz-10

MHz

0.3

Div

150

MHz-100

MHz

1.5 Div

750mV

LF REJ2

kHz-10

MHz

0.3

Div

150

MHz-100

MHz

1.5Div

750mV

AC HF

REJ

Hz-50

kHz

0.3

Div

150

DC-10

MHz

0.3Div

150

10MHz-100M!:Iz

1.5Div

750mV

Single Sweep Triggering

requirements

same as

normal sweep. When triggered,

sweep generator

produces

one

sweep

only.

Internal Trigger 1 nanosecond

less

mega·

Jitter

hertz.

External Trigger

Input

Maximum

Input

500

volts (DC + Peak AC).

500

Voltage volts (p.p AC)

1 kilohertz

less.

Input

Rand

C 1 megohm within 2%;

picofarads

within 2 picofarads.

10n

Internal

Triggering

Only.

the

specification

for

-3

frequency

the

Vertical

System

replaces

any

frequency

the

above

table

when

the

number

the

table

greater

than

the

-3

frequency

the

Vertical Amplifier.

2WiII

not

trigger

sine waves

3 divisions

less internal

1.5

volts

external

below

120

Hertz.

1·2

Characteristic

Level Range (Ex·

cluding

p.p

AUTO)

EXT

EXT +

Bright Baseline

p.p AUTO Opera·

tion

Sensitivity

Performance

least +3.5 volts

-3.5

volts.

least

+35

volts

-35

volts.

Sweep free·runs in absence

triggering signal in

p.p

AUTO

and

AUTO.

0.5

div Internal,

250

millivolts

External.

TABLE

1·2

ENVIRONMENTAL CHARACTERISTICS

This

instrument

will meet

the

electrical characteristics given

Table

1·1

over

the

following environmental limits.

Characteristic

Altitude

Non·operating

Transportation

Performance

50,000

feet and

-55°C.

Qualified

under

National Safe

Tran·

sit

Committee

test

procedure

1A,

category II.

TABLE

1·3

PHYSICAL CHARACTERISTICS

Finish

Dimensions

Weight

Front

panel

anodized aluminum.

1/4

inches long by 2

5/8

inches

wide by 5 inches high.

Approximately

1 3/4 pounds.

®I

TYPE 7B51

SECTION

OPERA

TING

INSTRUCTIONS

Change

information,

any,

affecting

this section

will

found

the rear

the manual.

General

The Type 7B51 delaying sweep plug-in unit operates

with a Tektronix 7000-series indicator oscilloscope and a

7A-series vertical plug-in

unit

form a complete oscillo-

scope system. To use

the

Type

7B51 effectively,. its

op~ra

tion and capabilities should be known. ThiS section

describes

the

operation

the

front-panel controls, gives

first-time and general operating information and lists some

basic applications for

this

instrument.

Installation

The Type 7B51

designed

operate

the

horizontal

plug-in

compartments

Tektronix 7000-series oscillo-

scopes. The Type 7B51 can also be installed

a vertical

plug-in

compartment

provide a sweep

that

runs vertically

the

CRT. However, when used

this manner, there is

no retrace blanking

internal triggering provision and

the

unit may not meet

the

specifications given

Section 1.

The instructions

this manual are written

for

use

the

Type 7B51

a horizontal plug-in

compartment

the

oscilloscope.

When

the

Type 7B51

used with an oscilloscope which

has

two

horizontal plug-in compartments, install this unit

the A (DELAYING TIME BASE)

compartment.

Then,

delayed-sweep unit

installed

the

B (right) compart-

ment, delayed-sweep operation

available. The

Type

7B51

will operate properly

the

compartment

for all horizon-

tal modes

operation

except

delaying sweep.

To install

the

Type

7B51 into a plug-in

compartment,

push it

until it fits firmly into

the

indicator plug-in

compartment. To remove, pull

the

release latch (see Fig.

2-1)

disengage

the

unit

from

the

indicator and pull it

out

the

plug-in

compartment.

Even though

the

horizontal

gain

the

indicator oscilloscope

standardized

minimize adjustment when inserting plug-in units,

the

sweep calibration of

the

Type 7B51 should be checked

when it

inserted into

the

indicator

verify measurement

accuracy. The procedure for checking

the

unit

given

under Sweep Calibration Check

this section.

FRONT~ANELCONTROLSANDCONNECTORS

General

All

controls required for

the

operation

the

Type 7851

are located

the

front

panel

the

unit

(see Fig. 2-2).

make full use

the

capabilities

this instrument,

the

TflIGGERABl£

AfffR

IJ£IAY

DELAY

TIME

MUlT

TfkTRONI)(®

7851

Fig. 2-1.

Location

release

latch.

operator should be familiar with

the

function and use of

each of these controls. A brief description

the

front-

panel controls and connector

given here. More detailed

information

given under General Operating Information.

Triggering Controls

LEVEL/SLOPE

TRIG'D

Selects

the

amplitude

point

and

slope

trigger signal

which

the

sweep

triggered. When

the

indica-

tor

line on

the

outer

ring

the

left

center,

the

sweep

triggered

the

positive-going slope

the

trigger signal, as shown by

the

positive-going waveform. To

the

right of center,

the

sweep

trig-

gered on

the

negative-going slope

the

trigger signal as shown by

the

negative-going waveform.

Light indicates

that

the

sweep

triggered and will produce a display

with correct setting

the

POSI-

TION control and

the

controls

the

associated vertical unit and indi-

cator oscilloscope.

2-1

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