Boonton 92E Manual de usuario

....

-

INSTRUCTION MANUAL

MODEL

92E

R.F. MILLIVOLTMETER

BOONTON

ELECTRONICS CORPORATION

Part

No.

982012-00A

791

ROUTE 10, RANDOLPH, NJ 07869

TELEPHONE:

201

-584·1077 TWX: 710-986-8215

Printed in U.S.A.

6/85

SAFETY

SUMMARY

The

following

general

safety

precautions

must

be

observed

during

all

phases

of

operation

and

maintenance

of

this

instrument.

Failure

to

comply

with

these

precautions

or with specific

warnings

elsewhere

in this

manual

violates

safety

~tandards

of

design,

manufactun.:.

and

intended

use

of

the

instrument.

Boonton

Electronics

assumes

no

liability

for

the

customer\

failure

to

comply

with

the~c

re4uirement~.

THE

INSTRUMENT MlIST

BF..

GROUNDED

To

minimize

shock

hazard

the

instrument

chassi:-.

and

cabinet

must

be

connected

lo

an

electrical

ground.

The

instrument

is

equipped

with

a

three

conductor.

three

prong

a.c.

power

cabk.

The

power

cable

must

either

be

plugged

into

an

approved

three-contact

dectrical

outlet

or

used with a

three-contact

to

a

two-contact

adapter

with

thdgreen)

grounding

wire firmly

connected

to

an

electrical

ground

at

the

power

outlet.

DO NOT OPERATE

THE

INSTRUMENT

IN

AN

EXPLOSIVE ATMOSPHERE.

Do

not

operate

the

instrument

in

the

presence

of

flammable

gases

or

fumes.

KEEP

AW

AY FROM

LIVE

CIRCUITS.

Operating

personnel

must

not

remove

instrument

covers.

Component

replacement

and

internal

adjust-

ments

must

be

made

by

quailfied

maintenance

pcrsonnd.

Do

not

replace

components

with

the

power

cable

connected.

Under

certain

conditions

dangerous

voltages

may

exist

C\en

though

the

power

cable was

removed.

therefore;

alway~

di~corrncct

power

and

dischargl'.

circuih

bl'.fore

touching

thew.

DO

NOT

SERVICE

OR

ADJlJST ALONE.

Do

not

attempt

internal

service

or

adjustment

unless

another

person.

capable

of

rendering

first

aid

and

resuscitation,

is

present.

DO

NOT

SUBSTITUTE PARTS

OR

MODIF"Y

INSTRUMENT.

Do

not

install

substitute

parts

or

perform

any

unauthori1ed

modification

of

the

insturment.

Return

the

instrument

to

Boonton

Electronics

for

repair

to

ensure

that

the safct;

leatures

an:

maintained.

SAFETY SYMBOLS.

This

safety

requirement

symbol

(located

on

the

rear

panel)

has heen

adopted

by tht·

International

Elcctrotechnical

Commi~~ion.

Documrnt

66

(Central

Office) J.

Para-

graph

5.3,

which

directs

that

and

imtrumenl

he

so

labeled

if.

for

the

correct

use ofthe

instrument.

it is necessary

to

refer t\l

the

imtruction

manual.

In this

case

it

is

recommended

tha\

refen.:ncc he madi:

to

the

inqruction

manual

when

connecting

the

instrument

to

rhe

proper

power

source.

Verify that the

correct

fuse is installed

for

the

power

available.

and

that

the

switch

on

the

rear

panel

is

'ct

to

the

applicahle

operating

voltage.

The

CAUTION

sign

denotes

a

ha1ard.

It ca

lb

at1cntion

to

an

operation

procedure,

practice,

or

the

like,

which.

if

not

correctly

performed

or

adhered

to.

could

result in

damage

to

or

destruction

of

part

or

alt

of

the

eyuipment.

Do

not

proceed

bcyond

a

CAUTION

sign until the

indicated

conditions

art• fully

understood

and

met.

WARNING •

The

WARN

ING

sign

denotes

a

ha1ard.

It

calls

attention

to

an

operation

procedure,

I

practice,

or

the

like.

which.

if

not

correctly

performed

or

adht"red

to,

could

result in

•------

111

injury

or

loss

of

life.

Do

not

proceed

beyond

a

WARNING

sign until

the

indicated

conditions

are

fully

understood

and

met.

f

Indicates

dangerous

voltages.

-

T A B L E 0 F C 0 N T E N T S

SECTION I - GENERAL INFORMATION

Paragraph

1-1

1-2

1-3

1-4

1-5

1-6

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

3-1

3-2

4-1

4-2

4-3

4-4

4-5

4-6

Introduction

Safety

Notice

Description

Accessories

Furnished

••••••

Options

and

Accessories

Available

Compatibility

of

Accessories

Specifications

•••.•..••••.••

SECTION

II

INSTALLATION

AND

OPERATION

Installation

.•.•.•••••.••••.•..••

Operating

Controls

and

Indicators

Safety

Requirement

Symbol

Initial

Operating

Procedures

Operating

Notes

••

,

••••••••

D.C.

Output

••.•

,

.••••••

Low

Frequency

Measurements

Correction

Curves

for

Models

952003-0lA

and

952007-0lA

Interface

Operation

.....

,

..................•..........

SECTION

III

-

THEORY

OF OPERATION

Introduction

••.••.•••..••••.•

Circuits:

Detailed

Discussion

A..

Sensor

B.

Chopper

c.

Amplifier

D.

Demodulator

E.

Driver

F.

Clock

......

G.

Ranging

and

Prog

r

arnm

i

ng

H.

Shaping

I•

Power

Supply

SECTION

IV

-MAINTENANCE

Introduction

••.••..•

Periodic

Calibration

Power

Supply

Checks

Calibration

Check

Calibration

Procedure

Troubleshooting

•.••••

A.

Cover

Removal

B.

Replacement

of

R.F.

C.

Probe

Tests

.•••..•

Probes

1.

2.

3.

S.W.R.

Measurement

Frequency

Response

Swept

Frequency

Response

and

S.W.R.

Page

...

l-1

.l-1

.l-3

.•

1-3

.1-4

.l-4

• •

2-1

••.

2-1

•

2-2

••

2-2

.2-2

.2-4

••••

2-5

.2-5

•••

2-6

.1-1

.....

1-

2

••

1-2

.1-2

.1-3

..•

1-3

•••

1-

3

.1-4

.1-7

.4-1

•••

4-1

.4-1

•••

4-1

•••

4-2

••

4-5

.4-5

• •

4-5

••

4-5

•••

4-6

.4-7

i

SECTION V -

PARTS

LIST

Paragraph

Page

5-1

Introduction

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

••

5-1

SECTION VI -

SCHEMATIC

DIAGRAMS

6-1

Schematic

Diagrams,

Table

of

Contents

••••••••••••••••••••••••••••

6-1

Figure

1-1

1-2

2-1

2-2

2-3

3-1

3-2

3-3

3-4

3-5

3-6

4-1

4-2

4-3

LIST

OF

ILLUSTRATIONS

Page

Input

Resistance

of

Model

92001-02A

R.F.

Probe

••••••••••••

••

1-6

Input

Capacitance

of

Model

92001-02A

R.F.

Probe

•••••••••••••••

1-7

Assembly

of

Type

N

Tee

Adapter

••••••••••••••••

, , • , ,

•••••••••

, • ,

••

2-3

Correction

Curves

for

Type

N

Tee

Adapters

•••••

•

•••••••••••••

2-5

Rear

Panel

Assignments

•••••••••••••••••••••

•

••••••••

2-6

Simplified

Block

Diagram

••••••••••••••••••••••••••••••••

•••••••

3-1

Block

Diagram:

Amplifier

Section

••••••••••••••••••••

.3-3

Block

Diagram:

Demodulator

and

Driver

•••••••

, • • • • • • • • ,

••••

, • , •

3-4

Block

Diagram:

Ranging

Circuitry

••••••••••••••••

3-5

Block

Diagram:

Shaping

Section

••••••••

..3-6

Block

Diagram:

Power

Supply

•••••••••••••••••

••

3-8

Adjustment

Locations

and

Descriptions

••••••••••••••••••••••••••

4-3

Frequency

Response

Test

Setup

• . • • • • • • • • • • • • • • • • ,

•••••••••

4-6

Swept

Frequency

Response

Test

Setup

••••••••••••••.•••••••••••••

4-8

LIST

OF

TABLES

Page

Crest

Factors

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

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

.

1-7

Table

1-1

2-1

2-2

2-3

2-4

5-1

5-2

Operating

Controls,

Indicators

and

Connectors

••••••••••••••••

2-1

Connect

ion

Recommendations

••••••••••

,

•••.••

, • • • • • • • • •

2-3

Rear

Panel

Pins:

Unit

Loadings

and

Comments

•••••••••••••••

..2-6

Interface

Input

Characteristics

•••••••••••••••••••••••••••••••.••

2-7

Applicable

Federal

Supply

Code

Numbers

for

Manufacturers

•••••••

5-1

Replaceable

Parts

....................•............•.........•....

5-2

ii

MODEL 921!

PROBE

iii

• Zl!RO

)

MV

d8m

3000

r=

1

+20

1000

r ·1

•1()

aoo

l } o

100

r

..

J

-10

30

r J

·20

10

r l

-30

3 r l

-40

P~R

~

~::

•

92E

RF

Millivoltmeter

-

S E C T I 0 N I

GENERAL

INFORMATION

1-1.

INTRODUCTION.

This

instruction

manual

provides

general

information,

installation

and

operating

instructions,

theory

of

operations,

maintenance

instructions,

a

parts

lists,

and

schematics

for

the

Model

92E.

SAFETY NOTICE

Although

this

instrument

has

been

designed

in

accordance

with

international

safety

standards,

general

safety

precautions

must

be

observed

during

all

phases

of

operation

and

maintenance

of

the

instrument.

Failure

to

comply

with

the

precautions

listed

in

the

Safety

Summary

located

in

the

front

of

this

manual

could

result

in

serious

injury

or

death.

Service

and

adjustment

should

be

per-

formed

only

by

qualified

service

personnel.

1-2.

DESCRIPTION

A.

General.

The

92E

R.F.

Millivoltmeter

provides

an

accurate

readout

of

measurements

from

the

low

radio

frequencies

to

the

gigahertz

region,

over

a

voltage

range

of

200

µV

to

3

volts.*

It

is

a

programmable,

solid

state

instrument

of

high

sensitivity

and

accuracy,

characterized

by

high

input

impedance

(see

Figures

1-1

and

1-2),

excellent

stability,

and

low

noise.

The 92E

exhibits

true

r.m.s.

response

for

input

signals

up

to

30

millivolts

gradually

approaching

peak-to-peak

above

this

level.t

The

meter,

however,

is

calibrated

to

indicate

r.m.s.

of

a

sine

wave

above

30

mv.

Input

and

output

connections

for

external

control

and

readout

are

provided

by

a

22

card

edge

connector

at

the

rear

of

the

instrument.

A

linear

d.c.

output,

the

level

of

which

is

proportional

to

the

r.f.

input

voltage,

is

also

provided

at

a

rear

connector.

This

d.c.

output

may

be

used

to

drive

a

recorder,

a

remote

indicator,

or

other

analog

devices.

The

instrument

is

sensitive,

accurate,

sturdily

constructed,

and

protected

against

overloads.

It

will

perform

over

extended

periods

of

time

without

failure

or

need

for

recalibration.

It

is

packaged

as

a

compact

bench

in-

strument

that

can

be

mounted

easily

in

a

standard

19

inch

rack,

us

an

optional

rack

mounting

kit.

B.

Accessories

Supplied.

Standard

accessories

supplied

with

the

Model 92E

include

one

each

of

the

following:

Model

95200l-02A

R.F.

Probe

with

low

noise

cable

and

connector.

Model

952002-0lA

50

Ohm

BNC

Adapter.

Model

952004-0lA

Probe

Tip

(removable),

with

grounding

clip

lead.

C.

Frequency

Capability.

The

calibrated

frequency

range

of

the

Model 92E

extends

from

10

kHz

to

1.2

GHz,

with

uncalibrated

response

to

beyond

8 GHz.

Relative

accuracy*

above

1.2

GHz

is

typically

±0.5

dB.

A

952002-0lA,

50

Ohm

BNC

Adapter,

is

supplied

as

a

standard

accessory

with

the

instrument

for

50

ohm

voltage

measurements

up

to

1.2

GHz.

For

through

line

voltage

measurements

the

optional

accessory

952003-0lA

Tee

Adapter

is

recommended.

It

is

designed

to

compensate

for

the

r.f.

probe

*To 300 v,

up

to

700

MHz,

with

accessory

100:1

divider.

tTo

3

V,

up

to

700 MHz,

with

accessory

100:1

divider.

1-1

§1.2,

Continued.

capacitance

and

to

present

a

good

s.w.r.

(better

than

1.15)

up

to

1.2

GHz.

It

may

be

used

in

conjunction

with

the

Model

952028-0lA

50

Ohm

Load

for

terminated

voltage

measurements.

In

a

coaxial

line

its

insertion

loss

is

low:

however,

a

graph

(Figure

2-2)

is

supplied,

showing

loss

vs.

frequency.

For

lower

frequency

measurements,

the

Model

91-4C

R.F.

Probe

is

available

as

an

optional

accessory.

Its

frequency

range

is

1 kHz

to

250

MHz.

D.

Voltage

Capability.

The

voltmeter

has

eight

ranges,

from

1 mv,

f.s.,

to

3

v,

f.s.,

arranged

in

a

1-3-10

sequence.

No

attenuator

attachments

are

required

for

measurements

up

to

3 v.

While

this

range

is

ample

for

most

radio

frequency

voltage

measurements,

the

capability

of

the

instrument

can

be

increased

to

300

V

(up

to

700

MHz),

by

using

an

optional

accessory,

the

high

impedance

100:1

Voltage

Divider.

Use

of

this

100:1

Voltage

Divider

also

increases

the

input

resistance

by

a

factor

of

1000

to

3000,

depending

upon

the

input

level.

E.

True

R.M.s.

Response.

The

Model

92E

provides

true

r.m.s.

response

for

signal

inputs

below

approximately

30

mV

(below

3 v,

up

to

700

MHz,

with

the

100:1

Voltage

Divider).

As

the

input

level

increases,

the

waveform

response

gradually

approaches

peak-to-peak,

calibrated

on

the

indicator

in

r.m.s.

F.

Low

Noise.

The

Model

92E

has

been

designed

and

constructed

to

hold

noise

from

all

sources

to

a

minimum.

The

probe

cable

is

of

special

low

noise

design~

a

vigorous

flexing

causes

only

momentary,

minor

deflections

of

the

meter

on

the

most

sensitive

range.

The

probe

itself

is

insensitive

to

shock

or

to

vibration.

Amplification

takes

place

at

94

Hz,

reducing

susceptibility

to

any

50

or

60

Hz

line

frequency

The

input

signals

from

the

probe

are

converted

into

94

Hz

signals

by

a

solid

state

chopper.

G.

Minimal

zero

Adjustment.

zero

adjustment

is

not

required

on

the

upper

five

sensitivity

ranges

of

the

voltmeter.

For

measurements

on

the

lower

three

ranges,

the

ZERO

control

is

adjusted

on

the

most

sensitive

range

before

operation.

Only

infrequent

checking

will

be

required

during

the

course

of

subsequent

measurements.

H.

D.C.

Output.

The

Model

92E

provides

a

linear

d.c.

output

whose

current

capability

of

1

mA

into

1000

ohms

is

extremely

stable.

When

used

as

part

of

an

automatic

test

system,

the

fast

response

of

the

instrument's

d.c.

output

to

an

input

step

function

allows

many

tests

per

unit

time.

For

system

or

external

requirements,

all

input

and

output

connections

for

the

92E

are

made

at

the

card

edge

connector

at

the

rear

of

the

instrument.

(See

§2-9

for

receptacle

connections.)

1-3.

ACCESSORIES FURNISHED

A.

Model

952001-02A,

R.F.

Probe.

Probe

with

low

noise

cable

and

connector

assembly

for

measurements

from

10

kHz

to

1.

2 GHz;

see

Figures

1-1

and

1-2

for

input

resistance

and

capacitance.

B.

Model

952004-0lA,

Probe

Tip.

Removable

probe

tip

with

grounding

clip

lead;

for

use

up

to

approximately

100

MHz.

c.

Model

952002-0lA,

50

Q

BNC

Adapter.

used

for

measurements

up

to

1.2

GHz

in

a 50 ohm

system.

*Relative

accuracy

refers

to

the

differential

between

two

measured

levels

without

regard

to

the

absolute

accuracy

of

either

measurement.

A

meas-

urement

of

a

100

mV

signal

at

8

GHz

may

indicate

20

mv

on

the

meter:

then

a

50

mv

signal,

at

that

same

frequency,

will

be

indicated

as

10

mv,

within

about

0.5

dB

(5.9%).

1-2

1-4.

OPTIONS

AND

ACCESSORIES AVAILABLE

option

-04:

Option

-06:

Option

-08:

Option

-12:

dBV

scale

uppermost.

75

n

dBm

scale

uppermost.

Rear

signal

input.

dBmV

scale

uppermost.

Accessory

91-4C:

Special

1 kHz

to

250

MHz

R.P.

Probe.

Low-frequency

probe

for

measurements

ranging

from

1 kHz

to

250

MHzi

input

resistance

is

essen-

tially

the

same

as

that

of

the

Model

952001-02A

Probe

(see

§l-3A).

Accessory

91-16A:

Unterminated

N

Adapter.

May

be

used

with

all

probes.

used

for

coaxial

connection

up

to

approximately

100

MHz,

or

to

400

MHz

when

fed

from

a 50 ohm

source

in

an

electrically

short

system.

Accessory

950002-0lB:

Single

Rack-Mounting

Kit.

Kit

for

mounting

one

92E

as

one

half

of

a

module

in

a

standard

19

inch

rack.

Accessory

950030-0lA:

Double

Rack-Mounting

Kit.

Kit

for

mounting

two

92E's

side

by

side

in

a

standard

19

inch

rack.

Accessory

952003-0lA:

50

n

Tee

Adapter.

Type

N

Tee

connectori

used

with

Model

952028-0lA

termination,

it

permits

connection

into

a 50 ohm

line.

See

Figure

2-2

for

insertion

loss

vs.

frequency.

Accessory

952005-0lA:

100:1

Voltage

Divider.

Attenuates

input

signal

by

a

factor

of

100

±(1

+

fMHz/200)%,

permitting

measurements

up

to

300

V,

and

extending

the

r.m.s.

measuring

range

to

3 V;

also

increases

input

resistance

by

a

factor

of

1000

to

3000,

depending

upon

input

level.

Operates

from

50 kHz

to

700

MHz.

Maximum

input

potential,

1000

V,

d.c.

plus

peak

a.c.

Accessory

952006-0lA:

75

O

BNC

Adapter.

Used

for

measurements

up

to

500

MHz

in

a 75 ohm

system.

Accessory

952007-0lA:

75

n

Tee

Adapter.

Type

N

Tee

connector;

used

with

Model

952029-0lA

termination,

it

permits

connection

into

a 75 ohm

line.

See

Figure

2-2

for

insertion

loss

vs.

frequency.

Accessory

952008-0lA:

Unterminated

BNC

Adapter

(Female).

Used

for

coaxial

connection

up

to

approximately

100

MHz,

or

to

400

MHz

when

fed

from

a 50

ohm

source

in

an

electrically

short

system.

Accessory

952028-0lA:

50 n

Termination.

Type

N

50

ohm

termination

for

use

with

Tee

connector.

Accessory

952029-0lA:

75

n

Termination.

Type

N

75

ohm

termination

for

use

with

Tee

connector.

Accessory

952011-0lA:

Accessory

Kit,

50

n.

Kit

contains

the

following

above

mentioned

items:

952008-0lA,

unterminated

BNC

adapter

(F);

952005-0lA,

100:1

voltage

divider;

952003-0lA,

50 O

Tee

adapter;

952028-0lA,

50 n

termination;

Model

952013-0lA,

Storage

Case

{case

for

pro-

tecting

and

storing

kit

accessories).

Accessory

952012-0lA:

Accessory

Kit,

75

n.

Contains

the

following

above-

mentioned

items;

952008,

unterminated

BNC

adapter;

952005,

100:1

divider;

952007,

75 ohm

Tee

adapter;

952015,

type

N 75 ohm

termination;

and

952013

storage

case.

1-5.

COMPATIBILITY

OF

ACCESSORIES

Accessory

models

952002-0lB

-

952029-0lA,

described

above,

appear

similar

to

some

older

accessories

with

model

numbers

type

91-xx.

(The

newer

accessories

have

black

printing

on

a

silver

colored

background;

the

older

accessories

have

silver

colored

printing

on

a

black

background.)

1-3

The

952001-02A

R.F.

Probe

can

be

used

with

these

older

accessories.

However,

the

frequency

dependent

specifications

given

in

this

manual

for

the

use

of

the

952001-02A

R.F.

Probe

in

combination

with

an

accessory

apply

ONLY

to

its

use

with

the

newer

accessories.

1-6.

SPECIFICATIONS

VOLTAGE

RANGE:

FULL~SCALF,

VOLTAGE

RANGE:

dBm

RANGE:

FREQUENCY

RANGE:

200

µV

to

3 V

(300

V

up

to

700

MHz

with

accessory

100:1

voltage

divider).

Lowest

detectable

voltage

is

approximately

100

µV.

I,

3,

IO,

30,

100,

300,

1000,

and

3000

mv.

-61

to

+23

dBm

(+63

dBm

up

to

700

MHz

with

optional

accessory,

100:1

Voltage

Divider).

10

kHz

to

l.2

GHz

(uncalibrated

response

to

approximately

8

GHz).

ACCURACY:

The

maximum

uncertainty

is

the

sum

of

the

uncertainties

given

in

sections

A,

B,

and

c.

Al.

Basic

Uncertainty,

Voltage

yol

tage

Level

mV

200

µV

-

3000

mV

1%

f.s.

A2.

Basic

Uncertainty,

dBm

1-4

-

§1-6,

Continued.

B.

Frequency

Effect

(50

ohm

measurements,

using

Model

952001-02A

Probe

with

Model

952002-018

BNC

Adapter

or

terminated

Model

952003

Type

N

Tee

Adapter.)

Frequency

mV

-----1

dBm

·

------

1

MHz

(Cal.

frequency)

0 0

10

kHz -

100

MHz

1%

rdg.

0.09

dB

100

MHz

-1

GHz

3%

rdg.

0.27

dB

1

GHz

-

1.

2

GHz

10%

rdg.

0.92

dB

--------

S.W.R.:

1.05

to

300

MHz;

1.10

to

1

GHz;

1.15

to

1.2

GHz.

c.

Temperature

Effect,

at

1 MHz.

Temperature

Range

21°C

to

25°C

18°C

to

30°C

10°C

to

40°C

0°C

to

55°C

METER:

METER

UNREST:

(1

mV

f.s.

range,

only)

R.F.I.:

POWER

SENSITIVITY:

WAVEFORM

RESPONSE:

CREST FACTOR:

INPUT IMPEDANCE:

mv

Ranges

dBm

Ranges

Instrument

R.F.Probe

Inst

rument

0 0 0

-----15----

0.2%

rdg.

1%

0.5%

rdg.

5%

1%

rdg.

12.5%

-

rdg.

o.

rdg.

0.

rdg.

o.

02

dB

04

dB

09

dB

0.

09

dB

0.45

dB

1.16

dB

4l/2-inch

taut-band

Two

linear

voltage

scales:

0

to

3:

0.05

per

division

0

to

10;

0.1

per

division

One

logarithmic

dBm

scale:

-10

to

+3;

0.2

per

division,

max.

Indicated

Voltage

Above

600

µV

300

JJV

to

600

µV

200

JJV

to

300

JJV

Unrest

<

1%

f.s.

<

2%

f.

s.

<

5%

f.

s.

There

is

no

detectable

radiated

or

conducted

leakage

from

the

instrument

or

the

probe.

800

pW,

minimum

measurable

power

in

50

ohms,

Minimum

detectable

power

in

50

ohms

is

200

pW.

True

r.m.s.

response

for

input

levels

up

to

30

mV

(3

volts

to

700

MHz

us,ing

the

100:1

Voltage

Divider),

with

transition

to

peak-to-peak

(calibrated

in

r.m.s.)

at

higher

levels.

420

to

1.4,

depending

upon

input

level

(see

Table

1-1).

See

Figures

1-1

and

1-2,

1-5

Boonton 92E Manual de usuario

Manuales populares de Instrumento de medición de otras marcas