Tektronix 7B52 Bedienungsanleitung

INSTRUCTION

MANUAL

Serial

Number

___

7852

DUAl.

TIME

BASE

Tektronix, I

. • P. O . Box

500

•

Beaverton,

egon

97005

•

Phone

644

-0

161 •

Cables,

ektronix

070

-' 043-

670

Scans

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Artek Media

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SECTION 1

SECTION 2

SECTION 3

SECTION 4

7B52

TABLE

OF CONTENTS

SPECIFICATION Page Preventive Maintenance

4-1

Introduction

1-1

General

4-1

Electrical Characteristics

1-1

Cleaning

4-1

Main Sweep (Table 1-1)

1-1

Transistor FET, and Integrated

Dly'd Sweep (Table 1-2)

1-1

Circuit Checks

4-1

Triggering (Table 1-3) 1-2 Recalibration

4-1

Mixed Sweep, Variable Time Delay Troubleshooting 4-2

(Table 1-4) 1-2 Introduction 4-2

Amplifier (Table 1-5) 1-3 Troubleshooting Aids 4-2

Environmental Characteristics Troubleshooting Equipment 4-3

(Table 1-6) 1-3 Troubleshooting Techniques 4-3

Corrective Maintenance 4-4

OPERATING INSTRUCTIONS Obtaining Replacement Parts 4-4

Soldering Techniques 4-5

General

2-1

Component Replacement 4-5

Installation

2-1

Front

Panel Controls and Connectors 2-2 SECTION 5 PERFORMANCE CHECK/CALIBRATION

Test Set-up Chart 2-9

First-Time Operating Instructions 2-9 Introduction

5-1

Sweep Calibration Check 2-9 Test Equipment Required

5-1

Simplified First-Time Operation 2-9 Short Form Procedure 5-2

General 5-5

CIRCUIT DESCRIPTION Procedure 5-5

Introduction

3-1

Simplified Block Diagram

3-1

SECTION 6 ELECTRICAL PARTS LIST

Main Sweep Mode

3-1

Abbreviations and Symbols

Delayed Sweep Mode

3-1

Parts Ordering Information

Mixed Sweep Mode 3-3 Index of Electrical Parts List

External Horiz Input 3-3

Circuit Description 3-4 SECTION 7 DIAGRAMS AND MECHANICAL PARTS

Introduction 3-4 ILLUSTRATIONS

Main Trigger Generator 3-5

Main Sweep Generator 3-7 Diagrams

Delayed Trigger Preamp 3-10 Mechanical Parts Illustrations (on

Delayed Trigger Generator 3-f1 reverse side

Diagrams)

Delayed Sweep Generator 3-11

Horizontal Preamp 3-13 SECTION 8 MECHANICAL PARTS LIST

Time/Div Readout Switching 3-14 Mechanical Parts List Information

Index of Mechanical Parts Illustrations

MAINTENANCE Mechanical Parts List

Introduction

4-1

Accessories

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. Change information, if any,

located

the rear of this manual.

MAIN

TRIGGERING

CDUI'l\II;

-•

.I.

Fig. 1·1. 7B52

IlI

Time

Base.

7852

ArtekMedia

Digitally signed by ArtekMedia

DN: cn=ArtekMedia, o=ArtekMedia.com,

ou, [email protected], c=US

Date: 2008.11.16 23:08:46 -06'00'

7B52

SECTION

SPECIFICA

TION

Change

information,

any, affecting this section will be

found

the rear

this manual.

Introduction

The 7B52 Dual Time Base

designed specifically for use

with

the

7503

Indicator Oscilloscope; however, it

com-

patible with

all

7000-Series Indicator Oscilloscopes. The

7B52 features calibrated sweeps from 5 s/div

ns/div

(0.5 s/div

5 ns/div with X10 Magnification), triggering

100 MHz, and four display modes. Other features include

lighted pushbutton switches, 0

10 times continuous

sweep delay, bright base line

AUTO mode

absence of

adequate triggering signals, and an AMPL position for

X-Y

operation.

Display modes include

MAIN

SWEEP, INTENSIFIED

SWEEP, DELAYED SWEEP, and MIXED SWEEP. In

the

MIXED mode,

the

Main

Sweep

displayed

point

selec-

ted by

the

DELAY TIME MULT, after which

the

sweep

rate

determined

DLY'D SWEEP setting. This mode

permits sweep magnification

any point

the

normal

(Main) sweep selected by

the

DELAY TIME

MUL

T control.

ELECTRICAL CHARACTERISTICS

The Performance Check procedure given

Section 5

provides a convenient method

checking performance

this instrument. The following electrical characteristics

apply over a calibration interval

1000 hours

six'

months (whichever occurs first)

an ambient temperature

OoC

+50o

unless otherwise noted. Warmup time for

given accuracy

minutes. The instrument must be

operating

a calibrated indicator oscilloscope for given

accuracy.

TABLE

1-1

MAIN

SWP

Electrical Characteristics

Characteristic Performance Requirement

Differential Sweep Measured

7500-Series

Accuracy1 Oscilloscope

Time Interval +15°C

+35°C

OoC

+50oC

Center 8 Unmag

Mag

2 Unmag

Mag

Divisions

ms/Div

2.5%

]..Is/Div

lThe

term

"Differential

Sweep"

refers

Sweep display measured

over

the

center

8 divisions

the

graticule.

2Measure Mag accuracies

between

first and ninth segment

un·

magnified sweep.

TABLE

1-1

(cont)

Characteristic Performance Requirement

5 s/Div

3.5%

s/Div and

]..Is/Div

.05

]..Is/Div

Any

two

Divi-

sions within Cen· measurement measurement

ter

8 Divisions

Sweep Rate

MAIN

Continuously variable between cali-

VARIABLE Range brated sweep rates. Extends sweep

rate

least 12.5 siD

Sweep Length 10.4 Divisions within 0.3 Division

1 ms/Div. (Adjusted

this rate.)

10.0

13.0 Divisions

all

other

sweep rates.

Sweep Holdoff Time

5 s/Div

times

the TIME/DIV switch

]..Is/Div

setting

less.

]..Is/Div

2.5

]..Is

less

.05

]..Is/Div

Normal/Mag Within 0.5 Division.

Registration

TABLE 1-2

DLY'D

SWP

Electrical Characteristics

Characteristic Performance Requirement

Differential Sweep Measured

7500-Series

Accuracyl Oscilloscope

Time Interval +15°C

+35°C

OoC

to+50oC

Center 8 Unmag

Mag2

Unmag

Mag

Divisions

ms/Div

3.5%

]..Is/Div

1-1

Specification-7B52

TABLE 1·2 (cont) TABLE 1·3 (cont)

Characteristic Performance Requirement

.5 s/Div

4.5%

s/Div

and

.2 l1s/Div

.05 l1s/Div

Any

two

Divi·

sions

within

Cen· measurement measurement

ter 8 Divisions

Sweep Length 10.4 Divisions

within

0.3 Division

at 1 ms/Div.

10.0

13 Divisions at all other

sweep

rates.

Sweep

Holdoff

Time Determined

MAIN

SWP

TIME/

DIV

switch setting.

TABLE 1·3

Triggering Electrical Characteristics

Characteristic Performance Requirement

Trigger Sensitivity Triggering Minimum

Coupling3 Frequency Signal

Range

Required

INT

EXT

Hz-l0MHz

0.3 Div 150

MHz-lOO MHz 1.5 Div 750

AC LF REJ4

kHz-l0

MHz 0.3 Div - - - -

(Main Only) 150 kHz-l0

MHz

- - --

150

MHz-l00MHz 1.5 Div 750

AC HF REJ

30Hz-50kHz

0.3 Div 150

(Main Only)

DC-l0MHz

0.3 Div 150

MHz-l00MHz 1.5 Div

750mV

Single

Sweep

Triggering requirements

same

(Main Only) Main Sweep. When triggered,

sweep

generator produces 1

sweep.

Internal Trigger 1

less

at 75 MHz.

Jitter

Internal Triggering

Only,

the

specified

upper

-3

frequency

the

Vertical

System

replaces

any

frequencies in

the

above

table

when

the

number

the

table

greater

than

the

upper

-3

frequency

the

indicator

oscilloscope Vertical Amplifier.

4WiII

not

trigger

sine waves of 3 Divisions

less internal,

1.5

volts

external,

below

120

Hz.

'·2

Characteristic Performance Requirement

External Trigger

Input

Maximum

Input

Voltage

Input

Resistance

nput

Capacitance

Level

Range

EXT

-7-

(Main Only)

500 volts (DC plus peak AC). 500

volts (peak-to-peak AC

1 kHz or

less).

1 megohm

within

2%.

20 picofarad

within

2 picofarad.

least +3.5 volts

-3.5

volts.

least +35 volts

-35

volts.

Auto

Bright

Base

Line Sweep free-runs in

absence

trig-

(Main Only) gering signal in

AUTO.

TABLE 1-4

Mixed Sweep, Variable Time Delay

Electrical Characteristics

Characteristic

Mixed

Sweep

Accuracy

Variable Time Delay

Differential Delay

Accuracy

Center 8 Divi-

sions

5 s/Div

1 s/Div

.5 s/Div

1 l1s/Div

Performance Requirement

plus measured

MAIN

SWP

error.

Exclude

following

portions

Mixed Sweep;

first

0.5 Divisions

Main Sweep

and

0.2 Division

0.1

l1s,

whichever

greater, after tran-

sition

Main

Sweep

Dly'd

Sweep.

Within

Multiplier

Linearity Within 0.2%

full

scale

minor

division).

Jitter

1 part

less

in 20,000

10 times

the

TIME/DIV

switch setting.

TABLE 1-5

Amplifier Electrical Characteristics

Characteristic Performance Requirement

Deflection

Factor

EXT,

Xl0

MAG

10 millivolts/division within 10%.

EXT

100

millivolts/division within 10%.

EXT

710

1 volt/division within 10%.

Frequency Response System

-3

points

75-Series

Oscilloscope

Lower

-3

Upper

-3

MHz

REJ 16 kHz 2

MHz

HF REJ

100 kHz

MHz

Specification-7B52

TABLE 1-6

ENVIRONMENTAL CHARACTERISTICS

This instrument will

meet

the

electrical characteristics

given over

the

following environmental limits.

Characteristic

Altitude

Non-Operating

Transportation

Performance Requirement

50,000

feet

and

-55°C.

Qualified

under

National Safe Tran-

sit

Committee

test

procedure

lA,

category II.

1-3

NOTES

7B52

SECTION

OPERA

TING

INSTRUCTIONS

Change

information,

any, affecting this section

will

found

at the rear

this manual.

General

The 7B52 Dual

Time

Base

Unit

designed specifically

for

use

h Te

ktronix

7500-Series

Indic

ator

Oscilloscopes

having one

rizontal plug·in compartment; however, it

com

patibl

e wi

all

Tektronix

700

-Ser

s Indicator

Oscilloscopes.

effectively

use

the 7B52, its operation

and capabi

liti

should be

known.

Thi

ssection describes the

operation

the front·pan

contr

ols, gives first·

time

and

general operating

information,

lists

some

basic applications

and tells

how

make the instrument compatible

with

all

7000

·Series oscilloscopes.

Installation

The 7B52

designed

operate

the

horizontal

plug·in

compartment

the oscilloscope, The

7B52

can

also

install

in a verti

cal

plug·in compartment

provide a

sweep that runs vertically on the

CRT

wever, when

used

in this manner, there

no retrace blanking

internal trig·

gering provisions, and the

unit

may

not

meet the specifica·

tions given

Section 1. The instructions in this manual are

written

for

use

the 7B52 in the horizontal plug·in

compartment.

Before proceeding

with

installation,

necessary

set

two

internal

7852

switches which provide proper triggering

Trig

NfRAME

DELAYING

Run

fter

, I

I_~

Independe

AYED

GGER

SOURCE

AUX

Fig. 2·

t.L

ocation

DELAYED

TRIGGER

SOURCE

MAIN

FRAME

DELAYING

switches.

signals

from

within

the indicator oscilloscope main·

frame. The

DELAYED

TRIGGER SOURCE and

IN·

FRAME

DELAY

ING

MODE

switches perform

these

functions;

see

Fig, 2·' . Table

2·'

lists the SOURCE and

MODE switch positions

for

using the

7852

in any

7000·Seri

Indicator

Oscilloscope.

TABLE

2·'

ndicator

Oscilloscope and Horizontal

Plug·ln Compartment

Used

Switch

7503

7504·7704 7504·7704

Position A HOR IZ B

HORIZ

DElAYED

TRIGGER

SOURCE

MAIN

Horizontal

Hor

izontal B Horizontal

Trig

Selector Trig Selector Trig Selector

AUX

eft

Vertical B

Hor

izontal A Horizontal

Signal Trig Selector Trig Selector

MAIN·

FRAME

DElAYING

MODE

Independent Normal Normal Normal

(Rear))

Runs

After

......

Delaying Swp .

.....

(Center)2 (8 H

orizonta

Runs

After

Delay

terval)

Triggerable

......

Delaying Swp

....

After

(Front)2

Horizontal

Triggerable

After

Delay

Interval)

) Sw

must

this

osit

ion

obtain

intensified

sweep,

Fun

ctional

only

when

7B52

is placed

HORtZ

compartment

7504

7704.

2-1

Operating

struct

s-7

To install the

7852

into a plug-in compartment, push it

until it fits firmly i

nto

the compartment.

remove, pull

the release latch (see Fig. 2·2) to disengage

the

unit from

the indicator oscilloscope and pull it

out

of the plug-in

compartment. Even though the horizontal gain

the

inc:li-

cator

oscilloscope

standardized to minimize adjustment

when inserting plug·ins. the sweep calibration

the

7852

should be checked. The procedure for checki

the unit

given under Sweep Calibration Check

the First-Time

Operating Instructions

this section.

REl.EASE

l.ATCH

.,"

TWIll.

,.-

DUAL TIME BASE

Fig.

2·2.

oe.

n of

s$fI

atc

FRONT·

PANEl

ONTROLS

and CONNECTORS

General

All

controls required for the operation of

the

7652

are

located on the front panel

the unit (see Fig. 2·3) with

the

exception of the internal DELAYED TRIGGER

SOURCE and

-FRAME

MODE

itches.

To make full use

the capabilities

this instrument, the

operator should be familiar with the function and use

each

these controls. A detailed description

the front·

panel controls and connectors

given here.

Main Triggering Controls

LEVEL/SLOPE

2·2

The LEVEL/SLOPE control deter-

mines whether the trigger

rcuit

responds on the positive-going

negative-going portion

the trigger

signal. When the indicator line on

the

outer

ring of the

lEVEL!

SLOPE control

to the left

center, the display starts on the

positive-going portion

the wave-

form (notice positiveijoing wave-

form symbol to l

eft

control). To

the right

center, the display

starts on the negativeijoing portion

TRIG'D

LAMP

the waveform (notice negative·

going

waveform symbol). When

several cycles

a signal appear

the display. the

lection of the

trigger slope

often unimportant.

However.

only a certain portion

a cycle

to be displayed, correct

setti

of the LEVEL/SLOPE con·

trol

important to provide a dis·

play which starts on the desired

slope

the input signal.

The lEVELISLOPE control

deter

mines the voltage level on the trig.

ger signal

which the display

triggered,

well

selecting the

igger

slope. The center knob

the LEVEL/SLOPE control pro·

vides about a 3:1 reduction

rela·

tion to the

outer

indicator ring, to

allow precise

level

selection. This

control can also be turned through-

out

the complete 3600 rotation to

allow continuous triggering over the

selected slope. When the

lEVEL!

OPE

control

set to the line on

either the positive-going

nega-

t ive-going waveform symbol the

sweep

triggered near

the

zero-volt

Ievei of the trigger signal lAC

coupled only). As the LEVEL!

SLOPE control

rotated

;may

from the zero line, the displayed

waveform starts

point

carre·

sponding to the position

the

ind icator tine on the associated

slope

waveform

symbol.

For

example,

the LEVEL/SLOPE

control

turned clockwise from

the zero line

the positiveijoing

slope symbol. the displaved wave·

form starts

a more positive level.

Before

setting the triggering

level,

select the TRIGGERiNG

MODE, COUP

and SOURCE.

Then

adj

ust the lEVEL/SLOPE

control

the displayed waveform

starts

the

desired point. The trig-

gering slope can be changed

any

time

rotating the LEVEL!

SLOPE

control

to the corre-

sponding point on the

other

ope

waveform symbol.

The TRIG'D lamp provides a con-

venient indication of the condition

the trigger circuits.

the

MAIN

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