HP 4937A Service-Handbuch

Inhaltsverzeichnis

Beliebte Prüfgeräte Handbücher anderer Marken

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HP

4937A

MODEL

4937A

SECTION

I

GENERAL

INFORMATION

1-1.

INTRODUCTION

1-2.

This

Operating

and

Service

Manual

contains

information

required

to

install,

operate,

test,

adjust,

and

service

the

Hewlett-Packard

Model

4937A

Transmission

Impairment

Measuring

Set,

Figure

1-1

shows

the

instrument

and

accessories

supplied.

Throughout

the

remainder

of

this

manual

the

Model

4937A

wili

be

referred

to

as

HP

4937A

or

the

instrument.

1-3.

The

Manual

part

number

is

listed

on

the

title

page.

Also

listed

on

the

title

page

of

this

manual

is

a

Microfiche

part

number.

This

number

can

be

used

to

order

4X

6

inch

microfilm

transparencies

of

the

manual.

Each

microfiche

contains

up

to

96

photo-duplicates

of

the

manual

pages.

The

microfiche

package

also

includes

the

latest

Manual

Changes

supplement

as

well

as

pertinent

Service

Notes.

1-4.

SPECIFICATIONS

1-5.

Instrument

specifications

are

listed

in

table

1-1.

These

specifications

are

the

performance

standards

or

limits

against

which

the

instrument

is

tested.

Supplemental

characteristics

are

shown

in

the

shaded

areas

or

in

italics

and

are

intended

to

provide

information

useful

in

the

application

of

the

instrument.

These

specifications

are

not

warranted

performance

parameters.

Performance

tests

are

listed

in

Section

IV

of

this

manual.

1-6.

SAFETY

CONSIDERATIONS

1-7.

This

product

is

a

Safety

Class

1

instrument

(provided

with

a

protective

earth

terminai),

The

in¬

strument

and

manual

should

be

reviewed

for

safety

markings

and

instructions

before

operation.

1-8.

INSTRUMENTS

COVERED

8Y

THIS

MANUAL

1-9.

Attached

to

the

instrument

is

a

serial

number

plate.

The

serial

number

is

in

the

form:

OOOOAOOOOO.

It

is

in

two

parts;

the

first

four

digits

and

the

letter

are

the

serial

prefix

and

the

last

five

digits

are

the

suffix.

The

prefix

is

the

same

for

all

identical

instruments;

it

changes

only

when

a

change

is

made

to

the

instrument.

The

suffix

however,

is

assigned

sequentially

and

is

different

for

each

instrument.

The

contents

of

this

manual

apply

to

the

instruments

with

the

serial

number

prefix(s)

listed

under

SERIAL

NUMBERS

on

the

title

page.

1-10.

An

instrument

manufactured

after

the

printing

of

this

manual

may

have

a

serial

number

prefix

that

is

not

listed

on

the

title

page,

This

unlisted

serial

number

prefix

indicates

the

instrument

is

dif¬

ferent

from

those

described

in

this

manual.

The

manual

for

this

newer

number

is

accompanied

by

a

yellow

Changes

Sheet

supplement.

This

supplement

contains

^’change

information”

that

explains

how

to

adapt

the

manual

to

the

newer

instrument.

^

4937A

^AL

INFORMATION

For

information

concerning

a

serial

number

prefix

that

is

not

listed

on

the

title

page

or

in

the

I

Changes

supplernent,

contact

your

nearest

Hewlett-Packard

sales

office.

DESCRIPTION

The

HP

4937A

is

a

voice

band

Transmission

impairment

Measurement

Set

that

also

Incor-

3

S

signaling

capability.

These

features,

combined

with

the

instruments

light

weight,

provides

a

3

le

field

service

tool

for

fast,

accurate

network

access

testing.

The

HP

4937A

signaling

feature

3

used

to

verify

the

proper

installation

of

PBX

systems.

The

transmission

impairment

measurements

that

can

be

made

using

the

HP

4937A

are

listed

ilow:

i.

Level

and

Frequency

I

Noise

I

Noise

with

Tone

1.

Signal

to

Noise

5.

Noise

to

Ground

3.

Return

Loss

The

procedures

for

using

supervisory

signaling,

and

for

making

the

transmission

impairment

urements,

are

described

in

Section

lil

of

this

manual.

Supervisory

signaling

is

used

to

detect

or

change

the

state

or

condition

of

a

subscriber

or

ork

line.

There

are

two

supervisory

conditions;

on-hook

and

off-hook.

The

on-hook

condition

en

the

telephone

is

idle.

That

is

the

handset

is

resting

on

the

cradle

and

the

grounding

switch

is

-

Off-hook

condition

is

when

the

telephone

is

active.

That

is

when

the

handset

is

removed

from

radle

and

the

grounding

switch

is

closed.

..

These

on-hook

and

off-hook

conditions

provide

circuit

indications

such

as

circuit

idle,

circuit

,

seizure,

and

disconnect,

}.

The

HP

4937A

can

perform

the

following

supervisory

signaling

functions:

1.

Loop

start

signaling

2.

Ground

start

signaling

3.

Loop

reverse

battery

signaling

4.

E/M

signaling

Types

i,

II,

and

lil

E

-1

•1

E

E

E/

i

Ei

■

TOE!

;NEI

-

1

1,

I

*

Inua

:

12

.

-

1

3

.

.'^rat^

‘

irtat

an

bi

•'

-14,

b€

i

I

neas

1

6

ietw'

;

wh

pen,

yr-\7

ie

c

.j

■

i-ia

'|jsy

5

E"

E

E

5

5.

Wink

MODEL

4937A

GENERAL

INFORMATION

1-20.

OPTIONS

The

following

options

are

available:

1,

Option

001

adds

a

rechargeable

battery

pack.

2,

Option

002

deletes

900

ohm

and

adds

1

SO

ohm

impedance,

3,

Option

910

includes

an

additional

Operating

and

Service

Manual.

1-21.

WARRANTY

Instrument

warranty

is

as

listed

inside

of

the

front

cover.

1-22.

ACCESSORIES

AVAILABLE

1,

Test

Cord

w/310

male

to

alligator

clips,

60

inches,

HP

P/N

18182A

2,

Test

Cord

w/310

male

at

both

ends,

36

inches,

HP

P/N

15513A

3.

Standard

19-inch

rack

mounting

kit,

HP

P/N

18132A

4.

Ladder

bracket,

HP

P/N

18161A

1-23.

RECOMMENDED

TEST

EQUIPMENT

1-24.

Equipment

required

to

maintain

the

Model

4937A

Is

iisted

in

table

1-2.

Other

equipment

may

be

substituted

if

it

meets

or

exceeds

the

critical

specifications

listed

in

the

table.

1-25.

BATTERY

OPERATION

(Option

001)

1-26,

instruments

with

Option

001

have

nickel-cadmium

batteries

that

enable

the

HP

4937A

to

operate

from

internal

power

when

in

areas

where

ac

power

is

not

available.

Typical

operating

time

is

S

hours

when

the

batteries

are

fully

charged.

The

batteries

are

trickle

charged

whenever

the

instru¬

ment

is

connected

to

an

ac

power

source

and

the

POWER

switch

is

in

the

STBY

position.

1-27,

Regular

discharge/charge

cycles

are

recommended

to

maintain

maximum

battery

capacity.

The

instrument

should

be

operated

until

the

batteries

are

discharged

(when

LOW

BATTERY

indicator

is

displayed

in

the

left

display)

then

recharged,

at

least

every

30

days.

Normal

recharge

time

is

about

14

hours.

Typical

battery

life

under

norma!

operating

conditions

should

be

at

least

100

char¬

ge/discharge

cycles.

Note

Batteries

do

not

charge

when

the

HP

4937A

is

operating

from

an

ac

source.

.

4937A

\AL

INFORMATION

Charging

the

Batteries

%

ODEl

=

NEF

28.

The

internal

battery

consists

of

one

15-volt

rechargeable

battery

pack.

To

recharge

the

bat-

connect

the

HP

4937A

to

an

ac

power

source

and

press

the

power

switch

to

STBY

(the

bat-

wil!

not

charge

with

the

power

switch

in

the

ON

position).

Normal

recharge

time

is

about

14

Charging

Temperature

|29.

hes,

Ties

•^urs,

(

I

i

-30.

The

batteries

may

be

charged

at

temperatures

between

+5

degrees

C

and

+40

degrees

C

(+41

3

S

F

and

+104

degrees

F),

but

wiil

have

greater

charge

capacity

if

charged

between

+5

3

s

C

and

+25

degrees

C

(+41

degrees

F

and

+77

degrees

F).

At

temperatures

above

+25

5

S

C

the

charge

acceptance

fails

off

as

shown

in

figure

1-2,

For

example,

a

cell

charged

at

egrees

C

accepts

about

60

to

70

percent

of

its

rated

capacity.

Temperatures

below

+5

3

S

C

cause

pressure

to

bulid

up

within

the

ce!!

as

it

is

charged,

which

couid

result

in

venting

of

il.

This

can

result

in

permanent

degradation

of

the

battery

capacity

due

to

loss

of

electrolyte.

■

i

•31,

egref

-\gre«

^gre;

45

d

egret

e

ce

.

Operating

Temperature

Normal

operating

temperature

of

the

HP

4937A

with

batteries

should

be

between

0

degrees

C

40

degrees

C

(+32

degrees

F

and

+104

degrees

F).

However,

there

will

be

a

loss

of

capacity

operating

at

the

extremes.

At

low

temperatures,

the

batteries

cannot

fully

discharge

even

h

they

were

fully

charged

at

room

temperature.

At

high

temperatures

the

same

effect

takes

but

to

a

lesser

degree,

in

addition

to

charge

acceptance

previously

mentioned.

Figure

1-2

il-

tes

this

elfect.

CHARGING

TIME

IN

HOURS

-

0.1C

CHARGE

RATE

Figure

1-2.

Charge

Acceptance

at

Various

Temperatures

i

i

32

-33.

nd

+

hen

'lougi

iace,

stra

6-

5

:

E-

C'l

■

1-4

MODEL

4937A

SPECIFICATIONS

Table

Specifications

LEVEL/FREQUENCY

Transmitter

Frequency:

Range:

20

Hz

to

9999

Hz

Resolution;

1

Hz

Accuracy:

+/-0.005%

of

output

frequency

Preprogrammed

functions:

SF

Skip;

skips

the

frequency

band

from

2450-2750

Hz

Frequencies:

at

power

up

404

Hz,

1004

Hz,

2804

Hz,

and

2713

Hz

Level:

Range:

-40

to

+13

dBm

Resolution:

0.1

dB

Accuracy

((«)

1004

Hz,

-19

dBm

to

0

dBm),

+/-0.1

dB;

(elsewhere)

+/-0.2

dB

Flatness

(referenced

to

1

kHz,

in

dB)

Frequency

(Hz)

20

200

4000

3999

*13

Level

(dB)

+10

-40

Distortion

(in

dB

from

fundamental)

Note:

(Includes

harmonics,

spurious,

and

background

noise

within

a

3

dB

bandwidth

of

4

kHz

or

4

X

f^whichever

is

greater.)

40

Level

+13

(d8)

+

10

0

-40

Note:

At

1004

Hz,

0

dBm,

threshold

is

more

than

65

dB

down

when

using

a

4-kHz

filter.

Frequency

(Hz)

100

4000

9999

-20

-

45

-

'

-45

-30

-55

:

-55

■

-40

-50

-50

+.

5

,-

3.0

+/-

0,.,2

+/-

0.2

+/-

I

.

0

'

1

o

+/-

0.2

;L

4937A

:lFICAT!ONS

Table

Specif

cations

(con’t)

sceiver

equency:

inge:

20

Hz

to

9999

Hz

(Solution:

1

Hz

xuracy:

+/-1.0

Hz

vei:

.nge:

-60

to

+13

dBm

solution:

0,1

dB

curacy:

(in

dB)

Frequency

(Hz)

20

50

200

4000

9999

/el

+13

n

-40

-50

te:

Receiver

accuracy

not

specified

below

500

Hz

when

using

150

ohm

termination.

(Instruments

with

option

002.)

te:

At

1004

Hz

accuracy

is

rZ-O.!

dB

from

-20

to

+13

dBm.

OSS

Talk:

>78

dB

isolation

(a

4

kHz,

decreasing

6

dB

per

octave

above

4

kHz.

^programmed

Functions:

nge

Hold:

Inhibits

the

autorange

from

changing

from

its

present

setting.

“SSAGE

CIRCUIT

NOISE

msmitter;

quiet

terminated

seiver:

nge:

0

to

99

dBm;

150

ohms,

lower

limit

is

7

dB

higher

(Option

002

instruments

only)

solution:

1

dB

ouracy:

+/-1

dB

from

10

to

99

dBm

+/-2

dB

from

0

to

10

dBm

ighting

Filters:

C-message,

and

3

kHz

Flat

MODEL

4937A

SPEClFiCATlONS

able

Specifications

(con't)

NOISE

WITH

TONE

Transmitter;

Frequency:

1004

Hz

fixed

tone

(for

other

specifications,

see

Transmitter

Frequency)

Receiver:

Notch

Filter;

>50

dB

rejection

from

995-

to

1025-Hz

Weighting

Filters:

C-message,

and

3

kHz

flat

Range;

lOto

39

dBm

(600,

900,

and

1200)

Resolution:

1

db

Accuracy:

+/-1

dB

from

20

to

99

dBm

+/-3

dB

from

10

to

20

dBm

SIGNAL-TO-NOISE

RATIO

T

ransmitter:

Frequency:

1004

Hz

fixed

tone

(for

other

specifications,see

Level

and

Frequency)

Receiver:

Signal

Level

Range:

-40

to

+13

dBm

Ratio

Range:

10

to

45

dB

Resolution;

1

dB

Accuracy:

+/-1

dB

NOISE-TO-GROUND

Transmitter;

quiet

terminated

Receiver:

Weighting

Filters;

C-message,

and

3

kHz

flat

Range:

50

to

99

dBm

(600,

900,

and

1

200

ohms)

Resolution:

1

dB

Accuracy:

+/-1.5

dB

RETURN

LOSS

2“Wire:

600

and

900

ohms

only

(600

ohms

Option

002)

Transmitter:

Level

Range:

-26

dBm

to

-2

dBm

Resolution:

0.1

dB

Transmitter

Spectra:

Echo,

singing

return

loss

low,

and

singing

return

loss

high

spectra

all

meet

the

specifications

of

IEEE

standard

P743

and

Bell

System

Publication

41009.

CATIONS

Table

Specifications

(cont)

'URN

LOSS

2-wire:

(con't)

siver;

ge;

0

to

40

dB

oiution:

0,1

dB

•nal

Hybrid

Impedance;

ofarads

(+/-1%)

600

ohms

(+/-0,1%)

or

900

ohms

C+/-0,1%)

in

series

with

2.16

//ire:

600

and

300

ohms

only

(600

ohms

Option

002)

nsmitter:

el

Range;

-26

dBm

to

-2

dBm

oiution:

0.1

dB

o'sl“gm"reTur

'

loss

low,

and

smgmg

return

loss

Wgh

spectra

all

meet

the

olfications

of

IEEE

standard

P743

and

Bell

System

Publication

41009,

:eiver:

ige:

0

to

SO

dB

solution;

0.1

dB

auracy:

+/-0,5

dB

overall

anshybrld

Loss

Compensation;

-29.9

dB

to

+29.9

dB

in

0.1

dB

steps