Tektronix 7B85 Manuale utente

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1®

Tektronix,

Inc

Box

500

Beaverton,

Oregon



97077



Serial

Number

COMMITTED

EXCELLENCE

Al"IQN

070-1961-01



First

Printing

JAN

1976

Product

Group



Revised

AUG

1983

7885

Instruction

LISA"

ILLUSTRATIONS

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

. .



Applications

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

.....

...

1-13

LIST

TA~LI~S

.........

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

. .



Delayed-Sweep

Measurements

.....

1-13

SAF

T"Y

SUMMARY

.......

. .

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



vii



Time-Interval

Measurements

(Delay-Time

Mode)

..... .

....

1-13

Section

OPEi~A"i

ING

INSTFtUC~'IONS



Differential

Time-Interval

Features

.........

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

1-1



Measurements

Time

Mode)

...

1-14

Installation

.......

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

1-1



Delayed-Sweep

Magnification

....

1-14

Controls,

Connectors,



T°riggered

Delayed-Sweep

Magnifi-

and

Indicators

.....

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

1-1



cation

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

......

1-18

Functional

Check

...

. .

...........

1-1



Independent

Mime-Interval

Setup

Procedure

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

1~4



Measurements

.......... .

....

1-18

Sweep

Functions

. .

.........

1-4

Normal

Sweep

. .

........

1-4

Magnified

Sweep

. ........

1-4



SeCtiOn

SPECIFICATION

Delaying

and

Delayed

Sweep

. .

1-4

(Differential)

TIME

. ........

1-5



Standard

Accessories

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

. .

2-4

Triggering

Functions

...

.......

1-5

General

Operating

Information

......

1-6

Triggering

Switch

Logic

.......

1-6

7"riggering

Modes

.......

......

1-6

P-P

AUTO

...........

......

1-6

AUTO

. .

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

.....

1-6



THEREMAINING

POR770N

THIS

TABLE

NORMaI

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

. .

...

1-6



CONTENTS

LIS7

SERVICING

INSTRUCTIONS

SINGLE

SWeeP

..........

. .

...

1-6



7HESE

SERVICING

lNSl"RUCTIONS

ARE

FORUSE

Trigger

Coupling

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

1-T



QUALIFIED

PERSONNEL

ONLY



AVOID

...

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

. . .

1-7



ELECTRICALSHOCK,

NOT

PERFORM

ANY

REJ

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

1-7



SERVICING

OTHER

THAN

'1"HAT

CALLED

OUT

REJ

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

1-7



THE

OPERATING

INSTRUCTIONS

UNLESS

QUALI-

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

1-7



F1ED

DOSO

Trigger

Source

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

1-7

INTernal

....

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

1-7

LINE

.......

.....,......

1-7

EXTernal

...

.....~~~~~-~

1-7



Section

1"HEORY

OPERATION

Trigger

Slope

...

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

1-8

d'~ARNING

Trigger Level

...

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

1-8



Block

Diagram

Description

...........

3-1

Horizontal

Sweep

Rates

........

1-8



Trigger

Generator

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

3-1

Time

Measurement

. .........

1-8



Sweep

Generator

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

3-1

Sweep

Magnification

.. .........

1-8



Pickoff

Amplifiers

and

Delay

Variable

Hold

Off

.....

........

1-8



Gate

Generator

. . . .

...........

3-1

Delay-Time

Operation

........

1-8



Logic

...........

. .

...........

3-1

TIME

Operation

....

........

i-11



Digital

Voltmeter

...

. .

..........

3-1

TIME

Operation



Detailed

Circuit

Description

. ..........

3-3

Dual-Beam

Oscilloscope



Logic

Fundamentals

....

.........

3-3

Mainframe

.........

......

1-11



Non-Digital

Devices

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

3-3

Mainframe

Operating

Modes

....

1-11



Front-Panel

Distribution

.........

3-6

REV

AUG

1981



7885

Instruction

Section 3

THEORYOF

OPERATION

(cont)



Comparator

(SN

B088750

Up)

3-21

Comparator

(SN

8088749

Trigger

Generator

........

. .

......

3-6



Below)

...

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

3-21

External

Source

......

.......

3-6



Ramp

Control

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

3-21

Internal

and

Line

Source

........

3-6



Divide

by 4

Counter

..........

. .

3-21

Trigger

Source

Selector

and



Timer

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

. .

3-21

Amplifier

.......

. .

..........

3-6



Reference

Current

Source

Peak-to-Peak

Auto

...........

3-8



(SN

~088750

Up)

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

3-22

Slope

Selector

and

Trigger



Reference

Current

Source

Generator

.. .

. .

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

3-8



(SN

~088749

Below)

...

.....

3-22

Gate

Generator

...........

. . .

3-9



Reference

Current

Inverter

Logic

.....

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

~ ~

~~~~.

3-10



(SN

~088750

Up)

....

. ......

3-22

Sweep

Modes

.........

......

3-10



Reference

Current

Inverter

Hold

Off

Timing

.......

3-11



(SN

B088749

Below)

...

......

3-22

Lockout

Buffer

Amplifier

........

3-11



Reference

Current Switch

.......

3-22

Hold

Off

Generator

. .

.........

3-11



Counter

and

Encoder

Hold

Off

Output

Amplifier

.......

3-11



(SN

B088"750

Up)

...........

3-22

Delay

Pickoff

Inhibit

...........

3-12



Counter

and

Encoder

Delay

Mode

Control

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

3-12



(SN

~088749

Below)

.........

3-22

Auxiliary

Y-Axis

Generator

...

. .

3-12



Counter

Transfer

Control

........

3-23

Sweep

Generator

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

. .

3-13



Zero

Count

Correction

..........

3-23

Timing Current

Source

....

.....

3-13



Time/Division

and

Readout

Ramp

Generator

.......

......

3-13



Switching

.....

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

3-23

Output

Preamplifier

...

. .......

3-13



Basic

Readout

System

.........

3-23

Sweep

Gate

Generator

.........

3-16



Time/Division

and

Readout

.....

3-23

Pickoff

Amplifiers

and

Delay



Delay

Time

Readout

..........

3-23

Gate

Generator

.....

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

3-16



Interface

Connectors

and

Power

Delay

Time

Comparison



Supply

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

....

......

3-24

(SN

B088750

Up)

..........

3-16

Delay

'time

Comparison

(SN

~088749

Below)

...

.....

3-16

'Time

Comparison

(SN

~088750

Up)

....

. .

......

3-16

Time

Comparison



Section

MAINTENANCE

(SN

~088749

Below)

.........

3-18

Delay

Bias

and

Second

Delay



Preventive

Maintenance

.......

. .

....

4-1

Pickoff

Clamp

...

...........

3-18



Cleaning

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

. .

....

4-1

Delay

Comparison

Voltage



Exterior

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

........

4-1

Switch

....

...........-.

. .

3-18



Interior

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

........

4-1

Delay

Gate

Generator

.....

....

3-18



Switch Contacts

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

4-1

Symbol

Enable

..........

...:

3-19



Visual Inspection

. .

. .........

4-1

Digital

Voltmeter

.........

. .

......

3-19



Lubrication

......

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

4-2

Delay

Comparison

Voltage

Ramp



Cam

Switch

Lubrication

.........

4-2

Converter

(SN

~088750

Up)

...

3-20



Semiconductor

Checks

...........

4-2

Delay

Comparison

Voltage

Ramp



Adjustment

After

Repair

.........

4-2

Converter

(SN

~088749

Below)

3-21



Troubleshooting

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

4-3



REV

AUG

1981

(cont)

REV

AUG

1981

(CONT

Page



Page

Section 4

MAINTENANCE

(cont)



Section

PERFORMANCE

CHECK

AND

ADJUSTMENT

Troubleshooting

Aids

...

. .

......

4-3



Preliminary

Information

.... .

......

5-1

Diagrams

..........

. .

......

4-3



Adjustment

Interval

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

5-t

Voltages

and

Waveforms

...

.....

4-3



Tektronix

Field

Service

. .

......

5-1

Circuit-Board

Illustrations

. .....

4-3



Using

This

Procedure

. .

....

5-1

Switch

Cam

Identification

. .

....

4-3



Test

Equipment

Required

.. ........

5-1

Diode

Color

Code

........

...

4--3



Special

Fixtures

....... .

......

5-1

Wiring

Color

Code

.........

...

4-3



Test

Equipment

Alternatives

....

5-1

Semiconductor

Basing

......

. .

4-3



Index

Performance

Check

Inter-Board

Connector



and

Adjustment

Procedure

....

. . . .

5-4

Identification

. .

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

.,-3



Preliminary

Procedure

.......

. .

5-4

Multi-Pin

Connector

Identification

4-3



Triggering

System

..........

. .

5-5

Interface

Connector

Locations

4-3



Horizontal

System

..........

. .

5-10

Performance

Check

and

Adjustment

.......

...........

4-5

Troubleshooting

Equipment

........

4-5

Troubleshooting

Techniques

. .....

4-6

Troubleshooting

Procedure

. .....

4-6



Section

INSTRUMENT

OPTIONS

Corrective

Maintenance

........

....

4-10

Obtaining

Replacement

Parts

...

4-10

Soldering

Techniques

........

...

4-10



SeCtiOn

REPLACEABLE

ELECTRICAL

PARTS

Component

Removal

and

Replacement

. .

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

. .

4-11

Circuit

Boards

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

. .

4-11



SeCtlOn

DIAGRAMS

AND

CIRCUIT

BOARD

Switches

...

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

. .

4-14



ILLUSTRATIONS

Semiconductors

. .

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

4-14

Interconnecting

Pins

...........

4-14

Circuit-Board

Pins

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

4-15



Section

REPLACEABLE

MECHANICAL

PARTS

Front-Panel

Lights

...........

4-15

Adjustment

After

Repair

...........

4-15

Instrument

Repackaging

..........

4-15



CHANGE

INFORMATION

7885

Instruction

7885

Instruction

Fig



Page



Page

7B85

Delaying

~T'ime

Base

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



viii



3-9



Digital

Voltmeter

detailed

block

diagram

1-1



Location

release

latch

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



1-1



(SN

8088749

below)

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



3-19

1-2



Front-panel

controls,

connectors,



3-10



Digital

Voltmeter

timing

diagram

.........



3-20

and

indicators

...

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



1-2



4-1



Lubrication

procedure

for

typical

cam

1-3



Effects

LEVEL

control

and

SLOPE



switch

..........

. .

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



4-2

switch

crt

display

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



1-9



4-2



Semiconductor

lead

configuration

........



4-4

1-4



Area

graticule

used

for

most

accurate



4-3



Inter-boar°d

multi-pin

connector

assembly

. .



4-5

time

measurements

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



1-10



4-4



End-lead

multi-pin

connector

assembly

...



4-5

1-5



Effect

sweep

magnifier

crt

display

. .



1-10



4-5



Location

numbers

Interface

con-

1-6



(A)

Delaying-sweep

display

produced



necior

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

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



4-6

78$5

the

horizontal

compartment

(B)



4-6



7885

troubleshooting

chart

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



4-8

Delayed-sweep

display

produced

com-



4-7



Readout

board removal procedure

.......



4-12

panion

time-base

unit

the

horizontal



4-8



Coaxial

end-lead

connector

assembly

....



4-13

compartment

....

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

...



1-10



4-9



Cam

switch

removal procedure

.........



4-16

1-7



Typical

(differential)

time

operation

.....



1-12



4-10



Removal

procedure

for

typical

push-button

1-8



Measuring

time

intervals

from a

triggering



switch

..........

. .

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

4-18

event

(start

sweep)

any

point

on a



4-11



Exploded

view

circuit-board pin

and

ferrule

4-19

waveform

.....

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

.....



1-14



4-12



Front-panel

light

socket

assembly

......



4-19

1-9



Measuring

rise

time,

fall

time,

period,

fre-

quency,

pulse width

the

(differential)

time

mode

....

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

. .



1-15



The

illustrations

Section 8 are located near

their

1-10



Magnifying

selected

segment

the

delay-



associated

diagrarrr

the

foldout

pages

ing

(A)

sweep

the

delay-time

mode

with

mainframe

alternate

chopped

horizontal



8-1



Semiconductor

lead

configuration

operation

....

. .

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

......



1-16



8-2



Location

circuit

boards

the

7885

1-11



Time-interval

measurements

the

delay-



8-3



A1--°-Interface

circuit

board

assembly

time

and

(differential)

time

mode

with



8-4



A2--

.-Trigger

circuit

board

assembly

mainframe

alternate

chopped

operation



1-17



8-5



A3----Readout

circuit

board

assembly

1-12



Examining

event

that

occurs

within

se-



8-6A



A4---(SN

B088750

Up)

Digital

Voltmeter

cir-

lected

time

interval

after

known

delay

time



cult

board

assembly

the

delay-time

mode

....

. .

.......



1-18



8-6B



A4---(SN

B088749

Below)

Digital

Voltmeter

2-1



7885

dimensional

drawing

. .

........



2-4



circuit

board

assembly

3-1



Basic

block

diagram

the

7885

Delaying



8-7



A1--Interface

circuit

board

assembly

Time-Base

unit

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

. .......



3-2



8-8



A2---_l"rigger circuit

board

assembly

3-2



Detailed

block

diagram

Trigger

Generator

3-7



8-9A



A4-_-(SN

8088750

Up)

Digital

Voltmeter

cir-

3-3



Functional

diagram

Trigger

Source

Selec-



cuit

board

assembly

for

......

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

. .

........



3-8



8-98



A4n-(SN

~088749

Below)

Digital

Voltmeter

3-4



Timing

diagram

for

Gate

Generator stage



circuit

board

assembly

(092, 096,

098)

.........

. .

........



3-9



8-10



Readout

circuit

board

assembly

3-5



Detailed

block

diagram

Logic

circuit

....



3-10



8-11



Location

Sweep

riming

adjustments

3-6



Timing diagram

for



Delay



Pickoff



Inhibit



8-12



Location

of Triggering

adjustments

stage

....

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

. .

..........



3-12



8-13A



(SN

B088750



Up)



Location



Digital

3-7



Detailed

block

diagram

Sweep

Generator

3-14



Voltmeter

adjustments

3-8



Detailed

block

diagram

Pickoff

Amplifiers



8-138



(SN

8088749

Below)

Location

of Digital

and

Delay

Gate

Generator

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



3-17



Voltmeter

adjustments



REV

AUG

1981

'Table



Page

2-1



Electrical

Characteristics

.....

. .

.....



2-1

2-2



Environmental

Characteristics

. .

.....



2-4

2-3



Physical

Characteristics

......

. .

.......



2-4

3-1



Basic Logic

Reference

.......

. .

.....



3-4

3-2



Readout

Character

Selection

. .

...

....



3-24

4-1



Shipping

Carton

Test Strength

...

....



4-19

5-1



Test

Equipment

. .

...

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

...



5-2



Delay

Time

Readout

Bias

..........

. .



5-12

5-3



Time

Accuracy

. .

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

. .



5-16

5-4



Sweep

Timing

....

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

. .



5-18

5-5



Magnified

Sweep

Timing

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

. .



5-19

7B85

Instruction

REV

AUG

1981



7885

Instruction

This

manual

contains

safety

information

the

user

must

follow to

ensure

safe

operation

this

instrument

WARNING

information

intended

protect

the

operator

;

CAUTION

information

intended

protect

the

instrument

The

following

are

general

safety

precautions

that

must

observed

during

all

phases

operation

and

maintenance

Ground

the

Instrument

reduce

electrical-shock

hazard,

the

mainframe

(oscilloscope)

chassis

mustbe

properly

grounded

Refer

the

mainframe

manual

for

grounding

information

Not

Operate

Explosive

Atmospheres

not

operate

this

instrument

an area

where

flammable

gases

fumes

are present

Such

operation could

cause

explosion

Avoid

Live

Circuits

Electrical-shock

hazards

arepresent

in this

instrument

The

protective

instrument

covers

must

not

removed

operating

personnel

Component

replacement

and

infernal

adjustments

mustbe

referred

qualified

service

personnel

Not

Service

Adjust

Alone

not

service

make

internal

adjustments

to This

instrument

unless

another

person,

capable

of giving

first

aid

and

resuscitation,

present

tMl4RNING

Warning

Statements

Warning

statements

accompany

potentially

dangerous

procedures

this

manual

The

following

warnings

appear

this

manual

and

are

listed

here

for

additional

emphasis

avoid

electrical

shock,

disconnect

the

instrument

from

the

power

source

before soldering

avoid

electrical

shock,

disconnect

the

instrument

from

the

power

source

before replacing

components

Handle

silicone

grease

with

care

Avoid

getting

silicone

grease

eyes

Wash

hands

thoroughly

after

use

REV

AUG

1981



vii

7885

Instruction

viii

TR,c~o

LEVEL



MODE



CTS)PtfkG



SCUH('

P-P

AUTO



;

AUTO



REJ

7885

Delaying

Time

Base

RfJ

SWP

CAL

TEKTRONIX'S

1MS2



ELAYING

TIME

BASE

7B85

1961-80A

REV

AUG

1981

The

7885

Delaying

TimeBase

unit

operates

with

TEKTRONIX

7700-, 7800-,

7900-Series

oscilloscope

mainframe

and

7A-Series

amplifier

unit

form a

complete

oscilloscope

system

This

section

describes

the

operation

the

front-panel

controls

and

connectors,

provides

general

operating

information,

functional

check

procedure,

and

basic

applications

for

this

instrument

The

7B85

Delaying

Time

Base

unit

provides

calibrated

sweep

rates

from

10 ns

and

triggering

400

MHz

for

7700-, 7800-,

and

7900-Series

oscilloscopes

The

X10

Mag-

nifier

increases

each

sweep

rate

factor of

and

the

VARIABLE

control

allows

continuously

variable

sweep

rates

between

calibrated

steps

Variable

hold

off

and

alphanumer-

readout are

provided

Also,

when

operating

the

AUTO

TRIGGERING

MODE,

bright

baseline

trace

displayed

the

absence

trigger

signal

fi`~~~,~1~

.>~_~`~C

The

time-base

unit

designed

operate

the

horizon-

tal

plug-in

compartment

the

mainframe

l~his

instrument

can

also

installed

vertical plug-in

compartment

provide

vertical

sweep

the

crt

However,

when

used

this

manner,

there

are

internal

triggering

retrace

blanking

provisions,

and

the

unit

may

not

meet

the

specifi-

cations

given

Section

remove

the

unit, pull

the

release

latch

(see

Fig

1-1)

and

pull

out

the

plug-in

compartment

RELEASE

LATCH

,Mn

~Bp8~5



DELAYING

TIME

BASE

_ _

.___

1___

___



_ .

.___

_ .

Section

~-71385

1960-13~

install

the

unit

plug-in

compartment,

push

until

fits

firmly

into

the

compartment

The

front

panel



Fig

1-1

Location

release

latch

the

unit

should

flush

with

the

front

panel

the

mainframe

Even

though

the

gain

the

mainframe

stan-

dardized,

the

sweep

calibration

the

unit

should

checked

when

installed

The

procedure

for

checking

the

unit



Figure

1-2

provides

brief

description

all

front-panel

given

under

Sweep

Functions

the

Functional

Check



controls,

connectors,

and

indicators

detailed

informa-

procedure

this

section



lion

given

the

General

Operating

Instructions

~UN~T°I®NmAL

~H~~K

The

following

procedures

are

provided

for

checking

basic

instrument

functions

Refer

the

description

the

con-

NI~i~~l~~,

CONN



1"C)H~,

,GNU



trots,

connectors,

and

indicators

while

performing

this

pro-

cedure

performing

the

functional

check

procedure

reveals

INUI~A~°~H



malfunction

possible

improper

adjustment,

first

check

the

operation

the

associated

plug-in

units,

then

refer

All

controls,

connectors,

and

indicators

required

for

the



the

instruction

manual

for

maintenance

and

adjustment

operation

the

time-base

unit

are

located

the

front

pan-



procedures

REV

AUG

1981



1-1

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