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1

Ν

E5

-

Γ

RU

CT101

V

ΜΑΝ

UA

L

2901

Serial

Nu

mber

TIME-MARK

G

ENE

R

A

TO

R

Te

k

t

r

onix,

Inc

.



"

Ρ

.

Ο

.

Box

500

"

B

eave

r

ton,

Oregon

97005

"

Phone

644-0161

"

Cables

:

Te

k

tronix

070-0995-00



370

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective

materials

and

workman-

ship

for

one

year

.

Tektronix

transformers,

manufactured

in

our

plant,

are

warranted

for

the

life

of

the

instrument

.

Any

questions

with

respect

to the

war-

ranty

mentioned

above

should

be

taken

up

with

your

Tektronix

Field

Engineer

.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

the

field,

there-

fore

all

requests

for

repairs

and

replace-

ment

parts

should

be

directed

to

the

Tek-

tronix

Field

Office

or

representative

in

your

area

.

This

procedure

will

assure

you

the

fastest

possible

service

.

Please

include

the

instrument

Type

and

Serial

or

Model

Num-

ber

with

all

requests

for

parts

or

service

.

Specifications

and

-price

change

privi-

leges

reserved

.

Copyrights

1970 by

Tektronix,

Inc

.,

Beaverton,

Oregon

.

Printed

in

the

United

States

of

America

.

All rights

reserved

.

Contents

of

this

publication

may

not

be

reproduced

in

any

form

without

permission

of

the

copyright

owner

.

P

age



Page

SE

CTIO

N

1

S

PE

CI

F

ICATIO

N



Test

E

qu

i

p

ment

R

eq

u

i

r

ed and

R

ecommen

d

ed

5-1

Introdu

ctio

n

1-1



S

h

ort

For

m

Pr

oce

d

ur

e



5-2

P

erformance

Conditions



1-2



Calib

r

atio

n R

ecor

d

a

nd

In

d

ex



5-2

E

lect

r

ical

C

ha

r

acteristics



1-2



P

erfo

r

mance

C

heck

/Cali

br

atio

n P

roce

d

ur

e



5-3

E

nviro

n

mental

C

h

aracteristics



1-2



P

reliminary

P

roced

u

re



5-3

Ph

ysical

C

h

aracte

r

istics



1-2



Test

E

qu

ipment

Setup

a

n

d

Co

n

trol

Settings

5-4

SE

CTIO

N

2

O

PER

ATI

N

G

I

N

ST

RU

CTIO

N

S



C

h

ec

k

Ove

n

Lig

h

t



5-3

Ch

ec

k

/A

d

ju

st

-30

V

S

upp

ly



5-4

I

n

tr

od

u

ctio

n

2-1

C

h

ec

k

P

ower

S

u

p

p

ly

R

eg

u

lation



5-4

Installation



2-1



C

hec

k

/A

d

ju

st

Crystal Oscillator

F

re

qu

ency

5-5

Co

n

trols

an

d

Connectors



2-2



C

hec

k

/A

d

ju

st

Mu

ltiplie

rs

(50

n

s,

10

π

s,

5

ns

General

O

p

erating

Information



2-2



and

2 ns)



5-8

C

h

ec

k

M

arke

r

O

u

t

pu

t

(Co

unt

d

own

S

E

CTIO

N

3

CI

R

C

U

IT

D

E

SC

R

I

P

TIO

N



Circ

u

its)



5-10

I

n

tro

d

u

ctio

n

3-1



C

hec

k

M

a

rk

e

r

Am

p

lifier

O

u

t

p

ut



5-12

B

loc

k

Diagram

Desc

r

i

p

tio

n

3-1



C

heck

Trigger

O

u

t

p

ut



5-12

Detaile

d

Circ

u

it

Descri

p

tion



3-1



C

hec

k E

xternal

Cloc

k

O

p

eratio

n

5-13

Oscillator



3-1

Mu

lti

p

lier



3-1



SE

CTIO

N

6

ELE

CT

R

ICA

L

P

A

R

TS

L

IST

Divider

an

d

Co

u

ntdown

Circ

u

its



3-3



Abbreviations

a

n

d

Sym

b

ols

P

ower

Su

pp

ly



3-9



P

arts

Ordering

Information

In

d

ex

of

E

lect

r

ical

P

a

rts

L

ist

SE

CTIO

N

4

M

AI

N

T

EN

A

N

C

E



E

lectrical

P

a

r

ts List

Introdu

ction



4-1

Access

to

t

h

e

I

n

te

r

ior



4-1



SE

CTIO

N

7

DIAG

R

A

M

S

A

N

D

MEC

H

A

N

ICA

L

Pr

eve

n

tive

M

ai

n

te

n

a

nce



4-1



P

A

RTS

I

LLU

ST

R

ATIO

N

S

O

F

Cleani

n

g



4-1

E

lectrical

Lu

bricatio

n

4-1

M

ech

anical

I

n

s

p

ection



4-1

R

e

p

ac

k

aging

P

erformance

C

h

eck

s



4-1

Tro

u

bles

h

ooting



4-2



SE

CTIO

N

8

MEC

H

A

N

ICA

L

P

A

R

TS

L

IST

Cor

r

ective

M

aintena

n

ce



4-5



M

ech

a

n

ical

P

arts

L

ists

Information

Sol

d

eri

ng

Tec

hn

i

qu

e



4-5



In

d ex of

M

echanical P

a

r

ts

an

d

Repackaging

Ill

u

strations

R

emovala

nd

R

ep

lacement of

Com

p

onents

an

d

Subassemblies



4-6



M

ech

anical

P

arts

L

ist

Ph

ysical

L

ocatio

n

of

Com

p

onents



4-9



Accessories

SE

CTIO

N

5

PERF

O

RM

A

N

C

E

C

HE

C

K

/

CA

L

I

B

RATIO

N

I

n

tr

od u

ctio

n

5-1

Com

p

lete

or

P

artial

Calibration

P

roce

dure



5-1

Com

p

lete

or

P

artial

P

erforma

n

ce

C

h

ec

k

5-1

TABLE

O

F

CONTENTS

2901

A

b

breviatio

n

s a

n

d

symbols

used

in

this

man

u

al

are

b

ase

d

on

o

r

ta

k

end

ir

ectly

from

IEEE

Stan

d

ar

d 260

"Stan

d

ard

Symbols

fo

r

Un

its",

MIL-STD-12B

and

ot

her

stan d

ards

of

t

h

e electro

nics

in

d

ust r

y

.

C

h

a

n

ge

informa-

tion,

if

any,

is

locate

d

at

t

h

e

r

ea

r

of

t

h

is

man

u

al

.

Fig

.

1-1

.

2901

Time-Mark

Generator

.

Intro

du

ction

S

E

CTIO

N

1

S

PE

CI

F

ICATIO

N

S

C

h

ange

information,

if

any,

affecti

n

g

t

h

is

section

will

be

fo

u n

d

at

t

h

e

rear

of

t

h

e

man

u al

.

T

h

e 2901 Time-

M

ar

k

Gene

r

ato

r

is

αcom

p

act,

wide

range,



T

he

inst ru

ment

is

pr

ovi

ded

wit

h

an

attac

h

e

d

t

h

ree-wire

soli

d

state

inst ru

ment

t

h

at

p

rovi

d

es

acc

ur

ate

time

and

fr

e-



p

ower

cor

d

wit

h

α

thr

ee-termihal

p

ola

r

ize

d p

l

u

g

to

connect

qu

e

n

cy

ma

rk e

r

s

fo

r cali

br

ati n

g a

n

d

verifyi

n

g both

t

h

e

swee

p

to

t

h

ep

ower

so

u

rce

.

T

h

e

t

h

i

r

d

wi

re,

d

i

r

ectly

connecte

d

to

time

acc

u

racy

of oscillosco

p

es

a

n

d

t

he

fre

qu

ency

dis

p

ersio

n



t

h

e

instr

u

me

n

t f r

ame,

is

i

n

te

nd

e

d

to

g

r

o

u

nd

t

h

e

i

nst ru

me

n

t

of

s

p

ect

ru

m

analyzers

.

M

ar

k

e

rfr

e

qu

e

n

cies

a

r

e

cont

r

olle

d by



to

p

rotect

op

erati

n

gpe

r

so

nn

el,

as

r

ecomme

n

d

ed

by

natio

n

al

αtem p

erat

u

re-stabilize

d

10

MHz

c

r

ystal



oscillato

r

.



M

a rk

er



an

d

international

safety

codes

.

ou

t

p

u

t

selections

incl u

de fou

r

sine-wave

f

r

eq

u

e

n

cies

(20

MHz,

100

MHz,

20O

MHz,

50O

MHz)

an

d

sixteen

ma

rk

e

r

intervals



The

instr u

ment

s h

o

u

l

d be

o

p

erate

d from αp

ower

so ur

ce

(

.1

Its

to

5s)

in

1-5-10

seq

u

ence

.

Α

ma

rk

e

r

am

p

lifie

r

o

u

t

put



wit

h

its

ne

u tral

at o

r

near

g

r

o

u

n

d

(ea

r

t

h

)

p

otential

.

It

is

p

rovides

eit h

er

p

ositive

or

negative-goi

n

g

h ig h

level

mar

k

ers



not

inte

n

ded

for

ope

r

atio

nf

r

om

two

p

h

ases

of

α

mu

ltip

h

ase

(1

Its

to

5

s)

wit

h minim

u

m

am

p

lit

u

de

of

25

V

into

1

k

Ω

.



E

ig h t



system,

or

ac

r

oss

the

legs of

α

single-

p

h

ase

t

h

ree

wire system

.

,_

I

_

ι

Μ

-,_~_,_~_

α

σσ

α

σσσσσσσσ

σσο

σσ

σ

ρ

10

.3

i

n

c h es

F

ig

.

1-2

.

2901

d

imensions

.

t

r

igger

i

n

te r

vals

( .1

Its

to

1

s)

are

also

p

rovi

ded

in

1-10

se-

quence

time

coi

n

cide

n

t

wit

h

t

h

e

ma

rk

e

r

s

.

Dime

n

sio

n

s

are

to

t

h

e

n

earest 1/8

i

n c

h

Ι

"



10

.9

inches

2901

3

i

nc

h

es

j

S

p

ecifications-2901

P

erformance

Conditions

C

h

aracte

r

istics

desc

r

ibe

d

i

n

t

h

is

section

a

r

e

valid

over

t

h

e

state

d

envi

r

o

n

mental

r

a

n

ge,

fo

r

inst ru

me

n

ts

calibrated

at

an

ambie

n

t

tem

pe

r

at

ur

e

betwee

n

+20°C

an

d

+30°C

.

Th

e

crystal

oven

i

n

d

icato

r

on

t

h

e

inst ru

me

n

t

m

u st s h

ow

t

h

at

normal

op

e

r

ating

tem

pe

r

at ur

e has

been

attai

n

ed

(

p

ower

applie

d

for

2

h

o

u

rs

o

r

more)

.

T

h

e

i

nst ru

ment

also

r

e

qu

i

r

es

at

least

α

30'

min

u te

wa

r

m

up pe

r

io

d

afte

rt

h

e

PO

WER

switc

h

is

switc

h

ed

on

.

Time-

M

ark

ers

Pe

r

io

d

s

Acc

u

racy

Stability

Am

p

lit

ude

M

A

RKER

O

U

Tpu

t

2

ns

(sine

wave)

5n

s

to 50

ns

(sine

wave)

.1

μ

s

to

5

s

(mar

k

ers)

M

A

RKER

A

MPL

I

F

I

ER

O

U

T

PU

T

T

R

IGG

ER

O

UT

p

u

t ( .1

μ

s

to

1 s

i

n

decade

ste

p

s)

.

Am

p

lit

ude

ELE

CT

R

ICA

L

C

HA

R

ACT

ER

ISTICS

C

h

aracteristic

E

XTe

rn

al

C

L

OC

K

INPU

T

Req

u

ire

d

Am

p

lit

u

de

'Parts

p

er million

.

Performa

nce

L

imits

0°

C

to

50

0C)

.

W

it

h

in

3

Ρ/

Μ

in

24

ho

u rs

(20°C

to

30°C)

at

.1

μ

s

(10

MHz)

after

2

h

o

u rs

o

p

eratio

n

.

At

least

0

.3

V

peak

to

p

ea

k

into

50

Ω

.

At

least

0

.5

V

p

ea

k

to



p

ea

k

i

n

to

50Q

.

At

least

0

.5

V

p

ea

k

to

pea

k

into

50

Ω

.

Am

p

lifie

d 5

s

to

1

μ

s

p

ositive

o

r

n

egative-goi

ng

time

mar

k

-

e

r

s

.

Am

p

lit

u

d

e

(5s

to

5μ

s

ma

rk

e

r

s)

at

least

25

V

into

1

k

Ω

loa

d

.

A

mp

lit

u

de

1

μ

s

ma

rk

e

r

at

least

22

V

i

n

to

1

k

Ω

loa

d

.

Positive-goi

n g

triggers at

least

0

.5

V

into

50

Ω

o

r 1

V

into

1

ΜΩ

,

150

pF

.

At

least

2

V

pea

k

to

p

eak

sine



Dimensio

n

s

wave



o

r



at



least



2

V



p

ea

k

p

u

lse

am

p

lit

u

de

.

C

h

aracte

r

istic

Maxim

u

m

Safe

In

pu

t

Am

p

lit

u

de

F

re

q

u

ency

Range

In

p

u t

Imp

edance

Sin

u soi

d

al-2

n

s,



5

n

s,



10

ns,



Line

Voltage

50

n

s

.



115V

R

ange

Pe

r

io

d

ic

Pu

lses-

.1

Its

to

5

s in



230

V

R

ange

1-5-10

se

qu

ence

.



C

r

est

F

actor

(

R

atio

:

Perio

d

wit

h

i

n

0

.001

%

(10

Ρ/

Μ

1,



Pea

k

/

RM

S)

20

°

C

to

30

°

C)

.



L

ine

C

u

rrent

Perio

d with

in

0

.002%

(20

Ρ

/

Μ

'

Power

L

ine

Fre

qu

ency

Ran

ge

Fu

se

(115V

and

230V

R

anges)

Tem

pe

r

at

u re

O

pe

r

ati n

g

Non-operating

Altit u

de

O

p

erating

Non-operating

F

i

n

is

h

W

eig

h

t

(net)

Pe

r

formance

Limits

5

V

(DC

+

p

ea

k

AC)

50

kH

z



o

r



less



to



10

MHz

.

L

owe

r

f

r

e

qu

e

n

cies

may

be used

if

t

h

e p

u lse

r

ate

of

r

ise

is

e

qu

al

to

or

faster

t

h

an

1

V/

μ

s

.

50

Ω

wit

h

i

n

20%

.

In

p

u

t

P

owe

r

Requ

irements

90

V

to

136

V

.

1

8

0

V

to

272

V

.

At

least

1

.3

240

mA

maxim

u

m

30

watts

maxim

u

m, at 115

V,

60

Hz

.

48

Hz

to

440

Hz

0

.3

Α

F

ast-blow

ty

pe

.

E

nvironmental

C

h

aracteristics

Ph

ysical

0°C

to

50

°

C

Ambient

-40

0

C

to

65

0

C

To

15,000

feet

To

50,000

feet

Fr

ont

panel

is

a

n

odized

alu-

minum

A

pp

r

oximately

8

l

b

s

.

A

pp

roximately

11

inc

h

es

Χ

8

inc

h

es

Χ

4'/3

inc

hes

.

See

F

ig

.

1-2

Intro

d

uction

Th

e

2901

Time-

M

ar

k

Gene

r

ator

p

r

ovi

d

es

acc

u

rate

time-

ma

rk

ers

f r

om

5

s

to

.1 1

.

ιs

intervals

a

n

d

sine

wave

fre

q

u

encies

from

50 n

s

(20

MH

z) to

2

ns

(500

MHz)

.

M

a rk

er

i

n

tervals

or

f

r

eq

u

e

n

cies

may

be

selecte

d by dep

r

essing

α

se

r

ies

of

self

canceli

ng

p

ush

b

u

ttons

.

Time-mar

k

ers

may

be

stac

k e

d

(not

u

sef

u

l

for

sine-waves)

by

p

ush

ing

t

h e

d

esi r

ed

mar

k

e

r

b

u

ttons

sim

u

lta

n

eo

u sly

.

SECTION

2

O

PER

ATI

N

G

I

N

ST

RU

CTIO

N

S

C

h

ange

information,

if

any,

affecting

t

h

is

section

will

be

fo

u n

d

at

t

h e

rear

of

t

h

e

man

u

al

.

ΝΟΤΕ

2901

T

h

e

crystal

oven

i

nd

icator

lig h

t

is

across

t

he h

eater

win

d ing for

t

h

e

crystal

oven

.

It

mo

n ito

r s t

he

o

p

er-

ation

of

t

he

t

h

ermostat,

and

i

n

dicates

w

h

en

t

h

e

h

eater

is

on

.

The

crystal

oven

p

ower

is

in

d

ep

en

d

-

ent

of

t

he P

O

WER

switc

h

.

T

r

igger

pu

lses,

from

.1

Its

to

1

s,

coinci

d

ent wit

h

t

h

e co

r -



FUN

CTIO

N

O

F

CONTROLS

res

pond

ing

time-mar

k ers,

are

available

at

t

he T

R

IGG

ER



A

N

D

CONNECTORS

O

U

Tp

u

t

connector

w

hen

any

of

t

h

e

eig

h

t

T

R

IGG

ER

S E

-

LE

CTO

Rpu

s

hb

u

ttons

are

d

e

pr

essed

.



All

selectors

and

connectors

re

qu

i

r

e

d

for

normal

op

era-

H

ig h

am

p

lit

u

de (25V

pea

k

to

p

eak

,

or g

r

eate

r

,i

n

to

1

k

Ω

)



tio n

of

t

he 2901 a

r

e

locate

d

on

t

h

e

front

a

n

drear p

anels

mar

k ers,

p

ositive-going

or

negative-going

p

ola

r

ity,

f r

om



of

t

h

einstr u

ment

(

F ig

.

2-1)

.

T

h eir

f

un

ctions

a

r

e described

1

Its

to

5s

are

available

at

t

h

e

M

A

RKER

AMPL

I

F

I

ER

O

U

T-



i

n

t

he

following

table

.

PU

T

conn

ecto

r

w

h

en

t

h

e

M

A

RKER

A

MPL

I

F

I

ER

switc

h

is

in

eit h e r

t

h

e

-h

o

r

-

p

ositions

.

M

A

RKER

AMPL

I

F

I

ER

switc

h

s

h

o

u

ld

be

in

t

h

e

O

FF

p

osition

w

hen

t

h

e

am

p

lifier

is

not

u

se

d

.



M

A

RKER

S

ELE

CTO

R



Self-canceling



p

ush

b

u

ttons,



t

h

at

select

in d

ivi

d

u al

o

r

combinations

of

time-mar

k

er

intervals

and

fre

q

u

encies,

for

t

he

M

A

RKER

OU

T

pu

t

Installation



connector

.

M

ar

k

ers

up

to

two

deca

d

es

ap

art

may

be

stac

k e

d

by

T

h

e

2901

instr u

ment

is

p

rovi

ded

wit

h

an

attac

h

ed th

ree-



de

p

ressing

t

h

e

d

esi

r

ed p

u

s

hbu

tto n s

wire

powe

r

cord with α

t

h

ree-termi

n al

p

olarize

d p

l

u

g

for



sim

u

ltaneo

u

sly

(not

a

pp

licable

fo

r

connectio

n

to

t

h

e

p

ower

so

u

rce

.

T

h

e

t

h

i r

d

wi

r

e

is

d

irectly



th e

sine-wave

fre

qu

encies)

.

connecte

d

to

t

he

inst ru

ment

frame

a n

d

is

i

n te n

ded

to

gro

un

d

t

h

e

i

n str u

me

n

t

to

p

rotect

op

erati

ng pe

r

sonn

el,

as

recom-



MA

RKER

O

U

Tp

u

t



O

u

t

p

u t

for

sine

waveo

r

ma

rk e

r

men

d

e

d

by

t

h e

n

ational

an

d

inte

r

natio

n al

safety

cod

es

.



per

ί

od

s

SELECTORS

.

selecte

d by

t

h

e

M

A

RK-

Color

co

d

ing

of

cord condu

ctors

follows

t

h

e

N

ational

E

lec-



ER S

ELE

TO

R

S

.

O

u

t

p

u

t

am

p

lit

u

de

trical



Code

:



L

ine



cond

u

ctor-blac

k

,



ne

u

t r

al



cond

u

cto

r

-



of

th e

mar

k

ers,

at

least

0

.5

V

p

ea

k

to

w

h

ite,

safety

eart

h

(gro

u n

d

ing)

cond

u

ctor-green

.



p

ea

k

into

50

Ω

loa

d

.

T

R

IGG

ER S

ELE

CTO

R



Series of

eig

h

t

self-canceli

n

g

p

u s h-

b u

ttons

t

h

at select

o

u

t

pu

t

trigger

O

p

e r

ate

t

h

e

2901

f r

om

α

p

ower

so

u

rce wit

h

its

ne

u tral



p

u

lses

from

.1

Its

to

1

s in

decade

at

o

r

nea

r

ground

(eart

h

)

p

ote

n

tial

.

It is

not

i

n

ten

ded

fo

r

ste

p

s

.

Trigger pu

lses

a

r

e

coi

n

ci-

op

e r

atio

n

f

r

om

two

ph

ases

of α

m

u

lti-

ph

ase

system,

or



dent

wit

h

t

h

e

corres

po

n

d

ing

time-

across

t

h

e

legs

of α

si

n

gle

p

h

ase,

t

h

ree-wire

system

.

L

ine



mar

k

ers

.

voltage

r

an

ge,

fo

r

t

he

115V

selector

p

osition,

is

90V

to



M

A

RKER

A

MPL

I

F

I

ER



Th

ree

p

ositio

n

switc

h

(-}-

O

FF

-)

136

V



(

n

ot to

excee

d

177

V)

;



an

d

180

V

to

272

V

(

n

ot to



t

h

at



p

rovi

d

es



am

p

lifie

d



p

ositive

excee

d 352 V)

for

t

h

e

230

V

range

of

t

he

line

voltage

se-



or



negative-goi

n

g



time-ma

rk

e

r s

lecto

r

p

ositions

.



L

ine

fre

qu

ency

ra

nge

is

48

Hz

to

440

H

z

.



at



t

he



O

U

T

PU

T



con

n

ecto

r

.



Se-

iecte

d

mar

k

ers

from

1

Its

to

5

s

a

r

e

amplified

t

h

e

ap

p

ro

p

riate

line

voltage

range

for

yo

ur

sit

u

-



m

p

lifie

d

to

at



least

25

V



p

ea

k

into

1

k

Ω

.

Does

n

ot

o

p

erate

over

ation

by

switc

h

ing

t

h

e

screw

d

r

ive

r

o

pe

r

ated

L

ine

V

oltage



t

h

e 2

ns to

.5

Its



r

a

n

ge

.



Switc

h

selector

on

t

h

e

bac

k

panel

(see

F

ig

.

2-1)

to

t

h

e

correct

p

osi-



s h

o

u

l

d

be

i

n

t

he

O

FF

p

osition

tio n

,

and p

l

ug

t h

ep

ower

co

r

d

i

n

to

αs

u

itable

p

owe

r

so

ur

ce

.



w

h

en

t

he

am

p

lifie

r

is

n

ot

u

se

d

.

Allow

two

ho

ur

s

fo

r

th e

c

r

ystal

oven temperat

u re

to

sta-

bilize

(to

mi

n

im

u

m

d

r

ift),

t

h

en

t

ur

n

t

he P

O

WER

switc

h

to



O

U

T

PU

T



O

u

t

p

u

t

co

nn

ector

fo

r

t

h

e

am

p

lified

ON

an

d

allow

5 minutes fo

r

t

h

e

i

n

str

u

ment

to

warm

up

.



time-mar

kers

.

O

u

t

p

u

t

am

p

lit

u

de

O

p

erating

Instructions

2901

Ζ

-

Ζ

Fig

.

2-1

.

F

ront

and

rea

r-

p

an

el

selecto

r s

an

d

connectors

.

O

p

erating

Instructions-

2901

of



t

h

e



mar

k

ers



is



at



least

25

V



or

less

.



F

re

qu

en

cies

below

50 kH

z

pea

k

,

i

n

to

α

1

k

Ω

loa

d

.



may

b

e

used

if t

h

e

rate of

rise

O

VEN

Indicator



Indicates

crystal

oven

h

eati

n

g

.



is

1

V

/

μ

s

.

The 0

.1

μ

s

M

A

RKER

Crystal

oven

and

in

d

icator

p

ower



SELE

CTO

R

pu

s

hbu

tto

n

is

t

h

e

Χ

1

a

r

e

in

d

ep

endent

of

t

h

e

P

O

WER



in

pu

t

signal

p

e

r

iod,

with

t

h

e lower

switc

h

.

Allow

approximately

2



order

selector

bu

ttons

co

u

nting

h

o

ur

s,

after

t

h

e p

ower

cor

d

h

as



t

h

e

in

p

u

t

p

eriod

d

own

in

1-5-10

been

connected

to

αp

ower

so

u

rce,



seq

u

ence

to

t h

e

lo

n

gest

(5

s

pu

s

h-

for



th e



crystal



tem

p

erat

u

re



to



b

utto n

)

pe

r

iod

.

2

n

s

to

50 π

s

sine-

stabilize

.

T

h

e

i

n str

u

ment

can

be



wave

ma

rk

er selections

are

in-

u

se

d

wit

h

i

n

5

min

u

tes

after

t

h

e



o p

erative

with

an

exte

rn al

sig

n

al,

P

OWER

switc

hhas been

tu

rne

d



u

nless

t

h

e in

pu

t fre

q

u

e

n

cy

is

10

on

;

h

owever,

freq

u

ency

stability



MHz

.

will

be

r

e

d

u

ce

d

.



L

I

NE

V

O

L

TAG

E

Selecto

r

Sc

r

ewd

r

ive

r

o

pe

r

ated

switc

h

t

h

at

C

L

OC

K

(

ΙΝΤ

-

ΕΧΤ

)

Switc

h

Selects

eit h

e

rt

h

e

i

n

te

r

nal

oscillator



selects

tn

r

90

V

p

r

ima

r

y



0

V

-

-

(Rear

P

anel)



or

an



exte

rn al



signal

as

t

h

e

f r

e-



272

f

V

o

r

ea

nominal

li

n

e

-1

voltage

V

or 180



-

q

u

e

n

cy

so

u

rce

for

t

h

e coun

tdow

n

2ltage

op

e

r

a-

tion

.

circ

u

its

.

ΕΧΤ

C

L

OC

K

I

NPU

T



U

se

d

for

external

oscillato

r

sig

nal

.

Connecto

r

Input

imped

ance

a

pp

roximately

50Q

.

E

xternal

cloc

k

fre

qu

ency

is



General

O

p

erating

Information

co

u

nte

d

down

in α

1-5-10

se-

quence,

to

50 χ10

6

times

t

h

e

in-



T

h

e

crystal

ove

n

temperat

u re

has

stabilized

w

h

en

t

he

pu

t

p

eriod

.

F

req

u

ency

range

50



O

VEN

i

n

dicato

r

cycles

on

a

n

d

off

at

regu

lar

intervals

.

kH

z

o

r

less

to

at

least

10

MHz

.



Pe

r

iod

of

t

h

e

cycle

is

abo

u

t

30

seco

n

ds,

de

p

ending

on

t

h e

R

eq

u

i

r

ed

signal

in

p

u t

am

p

lit

u

de

is



ambie

n

t

tem

pe

r

at

ur

e

.

1

volt

mi

n

im

u

m

p

ea

k

to

p

ea

k

sine

wave

to

5

V

(pea

k

AC



+



DC)



Te

r

minate

t

h

e

ou

t

p

u

t

into

50

Ω

for

o

p

tim

u

m

ma

rk

e

r

d

ef-

maxim

u

m

.



R

eset



level



+50

m

V

inition

and

consistent

mar

k

er

amplit

u

de

.