HP 85027A Service manual

OPERATING

AND

SERVICE MANUAL

~irector

P!avy

Cahbrat!on

Laboratory

Box

Naval

Air

Station

FPO

San

Francisco

96654-2901

85027A/B/C

DIRECTIONAL

BRIDGE

(bgI

EWLETT

PACKARD

é~

CI,

HEWLETT

____

PACKARD

Hewlett-Packard

Company

Video

Communications

Division

5301

Stevens

Creek

Boulevard

Box

58059

Santa

Clara,

Cilifornia

95052-8059

408

246-4300

October

30,

1997

Jim

Canton

Government-Industry

Data

Exchange

Program

GIDEP

Operations

Center

Corona,

California

91718-8000

Subject:

RELEASE

Dear

Mr.

Canton:

Attached

the

Document

Release

form

you

sentto

me.

Inregards

thedocuments

you

have

listed

your

form

thereproduced

documents

must

include

the

following

legendand

disclaimer:

‘Copyright

Hewlett-Packard

Company

(HF).

Reproduced

with

permission.

Hewlett-Packard

makes

warranty

any

kind

with

regard

this

material,

including,

butnot

limited

to,

the

implied

warranties

merchantability

and

fitness

for

particular

purpose.

Hewlett-Packard

not

liable

forerrors

contained

herein

for

incidental

consequential

damages

connection

with

the

furnishing,

performance

use

this

material

data.’

Please

let

know,

you

have

any

questions

can

any

furtherassistance.

Sincerely,

HEWLErr-PACKARD

COMPANY

Dixie

Luebcke

GIDEP

Representative

MANUAL

CHANGES

NOTE

Manual change

supplements

are

revised

often

necessary

keep

manuals

current

and accurate

possible. Hewlett-Packard

recommends

that

you periodically

request

the

latest edition

this supplement.

Free

copies

are

available

from

all

offices. When

requesting copies,

quote

the manual

identification

information

from

your

supplement,

or the

model

number

and

date

from

the

title

page of the manual.

MANUAL IDENTIFICATION

This

supplement

contains

important

information

for

correcting

manual

errors

and

for

adapting the

manual

instruments

containing

improvements

made

after

the

printing

the

manual.

Two

types

information are

included:

UPDATES

APPLY

ALL

SERIAL

NUMBERS.

NUMBERED

CHANGES

UPDATES

THAT

ARE

SERIAL NUMBER

PREFIX

RELATED.

The

information

the

following order: UPDATES,

NUMBERED

CHANGES in

sequen-

tial

order

with applicable

illustrations

possible

each

numbered

change.

use

this

supplement,

make

all

UPDATES

and

all

appropriate

serial

number

CHANGES

indicated

the

following

pages.

NEW

ITEM

UPDATES

Replace

the following

manual pages

with

the

pages

this document (UPDATES):

General

Information

1-6

Performance

Tests

4-8

Adjustments

5-3

5-4

r:~-:~’

C’~’~~

Box

FF0

San

Fra~~

£~3~

JANUARY

1987

HEWLETT

I’

PACKARD

Number:

85027A/B/C

Date

Printed:

July

1985

Part Number:

85027-90001

Printed

U.S.A.

85027A/B/C

General

Information

Table

1-1.

Specifications

85027A

85027B

85027C

Frequency

Range

(GHz)1

0.01

-1

8.0

0.01

-26.5

0.01

-1

8.0

Connector:

Input Type

(1)

3.5mm

(f)

Type

(f)

Test

Port

APC-7

3.5mm

(f)

Type

(f)

Max.

Input Power

+23

dBm

±l0volts

+23

dBm

±l0volts

+23

dBm

±l0volts

Directivity2

0.01

12.4

GHz

>=4OdB

>=40

>=36

12.4

18.0

Ghz

>=40

>=34

18.Oto2O.OGhz

—

>=4OdB

—

20.0to26.5GHz

—

>=36dB

—

Test

Port

Match2

0.01

8.4

GHz

>=23dB >=23dB

>=23dB

8.4to12.4GHz

>=l9dB

>=l5dB

>=l9dB

12.4

18.0

GHz

=15

18.Oto2O.OGhz

—

>=l5dB

—

20.0

26.5

Ghz

—

>=11

—

MHz

+7dBm

input

bridge

—

Spe

Ice

lons*

—5

—10

—

—20

—‘5

Deite

Power

(dB) —~30

—~5

‘Measured

‘Ru

‘25’Ci5’C

Dynamic

Power

Accuracy

1-6

UPDATES

APPLY

ALL SERIALS

85027A/B/C

Performance

Tests

Equipment HP

85027A

85027B

85027C

Sweep Oscillator

8350B

835DB

plug-in

83592A

83595A

83592A

Scalar

network

analyzer

8757A

Cal.

open/short

85021

-60021

85037-60001 85032-60001

ohm

load 909A opt

012 909D

909A opt

012

Adapter*

not

req’d

85027-60002

1250-1

475

second directional

bridge

required

test

instrument

addition

the

directional

bridge

under

test.

The

adapters recommended

are

suitable

for

use

with

two

similar

bridges.

Procedure

Set

the

equipment

shown

Figure

4-4,

with

the

calibrated open connected

the

test

directional bridge,

not

the

directional bridge

under

test.

PRESET

the

analyzer.

should indicate

that

Input

Channel

Turn

off

Channel

The

Preset should

also

preset

the

sweep

oscillator

sweep

time

200

with

27.8

kHz

modulation

on.

Set

the

sweep oscillator

start

and

stop

frequencies

correspond

the

first

band

frequencies

the

Performance

Test

Record

(0.01

8.4

GHz).

Perform

open/short

calibration

and

store

memory.

Connect

the

directional

bridge

under

test to

the

first

directional bridge,

test

port

to test

port

with

adapter

necessary. Connect

the

ohm

load

the

input port

the

directional

bridge

under

test.

the

8757A

turn

the

cursor

and

press

the

[MAX]

softkeyto

find

the

point

minimum

return

loss

(highest

point)

the

trace.

Enter

this

value

the

Performance

Test

Record.

Repeat

steps

through

for

each

frequency band

interest.

the

test

results

(including

uncertainties)

are not

within

specifications

-as

indicated

the

Test

Port

Match

Performance

Test

Record,

refer

the

Troubleshooting

section

this

manual.

Table

4-2.

Test

Port Match

Performance

Test

Record

85027A

85027B

85027C

Frequency

Spec.

Test

Spec.

Test

Spec.

Test

Band

(GHz)

Result Result Result

0.01-8.4

=23

______

=23

______

=23

_______

8.4-12.4

>=l9dB

_____

>=l5dB

_____

>=19dB

_______

12.4-18.0

>=l5dB

_____

>=l5dB

_____

>=l5dB

_______

18.0-20.0

—

>=l5dB

_____

—

20.0-26.5

—

>=11

______

—

Uncertainty*

>=ldB

>=2dB

4-8

UPDATES

APPLY

ALL SERIALS

85027A/B/C

Adjustments

Remove

the

printed,

plastic switch

configuration

label

from

the

back

the

bridge

(additional

labels are

available as

P/N

85027-80004).

Disconnect the power

sensor from

the

attenuator.

Turn

modulation.

Con

nect

the

bridge

input

port

the

attenuator,

leaving

the

test

port

open.

the

analyzer,

turn

averaging

(avg.

factor

=8),

and

the

cursor.

the

8757A,

turn

smoothing

(5%).

Adjust

(see

Figure

5-2)

for

cursor

reading

-6±0.1

dBm.

Set

the

attenuator

dB.

Adjust

R29

(Figure

5-2)

for

cursor

reading

calibrated

-30

minus

±0.1

dBm.

10.

Set

the

attenuator

and

adjust

R29

(if

required)

until

the cursor reads

-6

±0.1

dBm.

11.

Repeat

steps

through

until

the

change

level

equal

the

calibrated

±0.1

and,

with

attenuation,

the

cursor indicates

-6±0.1

dBm.

Adjustment

Procedure

NOTE:

You

can

perform this

procedure

only with

8757A

analyzer.

12.

the

8757A,

set

DC mode.

13.

Set

the reference

level

-50

dBm

midscreen,

and

the

scale

dB/div.

14.

the

source,

turn

off

the

power.

15.

the

analyzer,

press

[CAL] [CONFIG

SYSTEM].

your

analyzer

has

firm

ware revision

2.0

above,

press

[CAL]

and

select

[MORE] [AUTOCAL],to

turn

auto

calibration

OFF.

16.

the

bridge,

use

short

jumper

short

pad

(where

yellow

wire

termi

nates)

ground.

17.

Adjust

R25

(Figure

5-2)

for

minimum

reading

the analyzer

(it

should

dBm).

18.

Remove

the

short,

and

turn

auto

cal

back

ON.

Feedthru

Null

Adjustment

Procedure

19.

the

analyzer,

press

[CAL]

and

select

[DC

DET

ZERO]

[AUTOZERO].

20.

Adjust

RiO

(Figure

5-2)

for

HIGH

trace

as possible.

Adjust

slowly,

because

averaging

and

smoothing

mask

adjustment

effects.

NOTE:

Steps

and

must

repeated

until

further

change

noted.

5-3

UPDATES

APPLY

ALL SERIALS

85027A/B/C

Adjustments

Mode

Adjustment

Check

21.

the

source,

turn

the

power.

22.

Set

the

attenuator

dB.

23.

the

analyzer,

verify

DC mode,

averaging, smoothing,

and

the cursor are still

on.

Allow the

trace

settle.

Press

[DISPLAY][MEAS-.MEM][MEAS-MEM].

The

cursor

should

now

indicate

0.0

dB.

24.

Set

the

attenuator

dB.

25.

The

cursor

should

now

indicate

the

calibrated

-30

within

0.8

dB.

26.

the

value

indicated

is not

within

0.8

the

calibrated

-30

dB,

may

necessary

adjust

and

R29

until

the

difference

between the

and

attenuator settings

just

within

0.8

the

calibrated

dB.

Adjust

when

the

attenuator

setting

and

R29

when

dB.

27.

any

adjustments are

made,

will

necessary

repeat the

Adjustment

Procedure

again,

only

this

time

using

tolerance

limit

0.8

instead

the

0.1

indicated

steps

through

11.

This

will

allow

you

split

the

error

difference

between

the

two

modes

operation.

28.

Both

and

dynamic

accuracy

specifications

should

within

the

limits

stated

Table

1-1.

5-4

UPDATES

APPLY

ALL SERIALS

85027A/B,/C

DIRECTIONAL

BRIDGE

SERIAL

NUMBERS

This

manual

applies directly to

the

85027A/B/C

directional

bridge

with

serial

numbers prefixed

follows:

Model

85027A

85027B

85027C

Serial

Prefix

2522A

For

additional

information

about

serial numbers, refer

INSTRUMENTS

COVERED

MANUAL

Section

and BACKDATING,

Section

HEwLETr-PAcKARD

COMPANY

1985

1400

FOUNTAINGROVE

PARKWAY,

SANTA

ROSA,

95401

U.S.A.

MANUAL

PART

NUMBER

85027-90001

Microfiche

Part

Number

85027-90002

Box

i~-

FF0

San

FI~r~C~

Printed:

JULY

1985

HEWLETT

PACKARD

85027A/B/C

Table

Contents

CONTENTS

Section

Page

GENERAL

INFORMATION

1-1

Introduction

1-1

Specifications

1-1

Safety

Considerations

1-1

Instruments

Covered

Manual

1-1

Description

1-3

Equipment

Required

But

Not

Supplied

1-3

Scalar

NetworkAnalyzer

1-3

8757A

1-3

8756A

1-3

8755C

1-4

Swept

Signal

Source

1-4

8350B

1-4

8340A

1-4

HP8341A

1-4

Detectors

1-4

Power

Splitters

1-4

Equipment

Available

1-4

Accessories

Available

1-4

Recommended

Test Equipment

1-5

Warranty

Restrictions

1-5

INSTALLATION

2-1

Introduction

2-1

Initial

Inspection

2-1

Preparation

for

Use 2-2

Power

Requirements

2-2

Connecting

the

85027

2-2

Mating

Connectors

2-2

Operating

Environment

2-3

Storage

and

Shipment 2-3

Environment

2-3

Packaging

2-3

OPERATION

3-1

Introduction

3-1

Operating

Precautions

3-1

Connector

Wear

3-1

Operating

Instructions

3-1

Operator’sCheck

3-4

Equipment

3-4

Procedure

3-4

85027A/B/C

Table

Contents

PERFORMANCE

TESTS 4-I

Introduction

4-1

Performance

Test

Record

4-1

Directivity

4-1

Description

4-I

Equipment

4-2

Procedure

4-2

Below

GHz

4..3

Above

0Hz

4-4

Test

PortMatch

4-7

Specifications

4-7

Description

4-7

Equipment

4-8

Procedure

4-8

DynamicPower

Accuracy

(AC

and

DC)

4-9

Specifications

4-9

Description

4-9

Equipment

4-9

Procedure

4-10

ADJUSTMENTS

5-1

Introduction

5-1

Adjustment

Procedures

5-1

Adjustment

Procedure

5-2

Adjustment

Procedure

5-3

Feedthru

Null

Adjustment

Procedure

5-3

Mode

Adjustment

Check

5-4

REPLACEABLE

PARTS

6-1

Introduction

6-1

Exchange

Assemblies

6-1

Replaceable

Parts

List

6-1

Organization

6-1

Information

6-1

Ordering

Information

6-2

MANUAL

BACKDATING

CHANGES

7-1

Introduction

7-1

Application

7-1

SERVICE

8-1

Introduction

8-1

Theory

Operation

8-I

Troubleshooting

Procedures

8-2

GainingInternal

Access 8-2

Cable

ContinuityCheck

8-2

Power

Cable

Replacement

8-3

Input

Port

and

Test Port

Resistance

Checks

8-3

Microcircuit

Check

8-3

Circuit

Board

Assembly

Replacement

8-4

Bridge

Microcircuit

Assembly

Replacement

8-4

Power

Supply Check

8-5

Signal

Path

Check

8-7

Clock/Control

Check

8-7

Connector

Inspection

8-7

Visual

Inspection

8-7

Mechanical

Inspection

8-9

Gaging

the

Precision

3.5mm

Connector

8-9

Gaging

the

APC-7

Connector

8-14

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