HP 11941A Kurzanleitung

11941A

CLOSE-FIELD

PROBE

July

1987

Hewlett-Packard

Company

1212

Valley

House

Drive

Rohnert

Park,

949284999

U.S.A

CERTIFICATION

Hewlett-Packard

Company

certifies

that

this

product

met

its

published

specifications

the

time

ship¬

ment

from

the

factory.

Hewlett-Packard

further

certifies

that

its

calibration

measurements

are

traceable

the

United

States

National

Bureau

Standards,

the

extent

allowed

the

Bureau's

calibration

facili-

and

the

calibration

facilities

the

other

International

Standards

Organization

members.

WARRANTY

This

Hewlett-Packard

instrument

product

warranted

against

detects

material

and

workmanship

for

period

one

year

from

date

shipment.

During

the

warranty

period,

Hewlett-Packard

Company

will

Its

option,

either

repair

replace

products

which

prove

defective.

For

warranty

service

repair,

this

product

must

returned

service

facility

designated

HP.

Buyer

shall

prepay

shipping

charges

and

shall

pay

shipping

charges

returri

the

product

Buyer.

However,

Buyer

shall

pay

all

shipping

charges,

duties,

and

taxes

for

products

returned

from

another

country.

warrants

that

its

software

and

firmware

designated

for

use

with

instrument

will

execute

its

programming

instructions

when

properly

installed

that

instrument.

does

not

warrant

that

the

opera¬

tion

the

instrument,

software,

firmware

will

uninterrupted

error-free.

LIMITATION

WARRANTY

The

foregoing

warranty

shall

not

apply

defects

resulting

from

improper

inadequate

maintenance

Buyer,

Buyer-supplied

software

interfacing,

unauthorized

modification

misuse,

operation

outside

the

environmental

spiecifications

for

the

product,

improper

site

preparation

maintenance.

OTHER

WARRANTY

EXPRESSED

IMPLIED.

SPECIFICALLY

DISCLAIMS

THE

IMPLIED

WARRANTIES

MERCHANTABILITY

AND

FITNESS

FOR

PARTICULAR

PURPOSE.

EXCLUSIVE

REMEDIES

THE

REMEDIES

PROVIDED

HEREIN

ARE

BUYER’S

SOLE

AND

EXCLUSIVE

REMEDIES

liable

FOR

ANY

DIRECT,

INDIRECT,

SPECIAL,

INCIDENTAL,

CONSE¬

QUENTIAL

DAMAGES.

WHETHER

BASED

CONTRACT,

TORT.

ANY

OTHER

LEGAL

THEORY.

ASSISTANCE

Product

maintenance

agreements

and

other

customer

assistance

agreements

are

available

for

Hewlett-

Packard

products.

For

any

assistance,

contact

your

nearest

Hewlett-Packard

Sales

and

Service

Office.

Addresses

are

provid¬

the

hack

this

manual.

CONTENTS

General

Information

..*

1-2.

Description

...

1-4.

Accessories

Supplied.

1-6.

Options

1-11.

Initiallnspection.

Specifications.

Operation

3-2.

Theory

Operation....

3-4.

Antenna

Factors.

3-7.

Power

Density

and

Electric

Field

Calculations..

3-9.

Localized

Field

Source.

3-11.

Test

Setups.

Measurement

Techniques.

Operation

Verification..

Calibration

Cycle..

4-8.

Output

Impedance

Measurement

Test

..*.10

4-9.

Insertion

Loss

Measurement

Test

.1^

Replaceable

Parts

SMA

Adapter

Replacement

Procedure.lb

5-4.

SMA

Rotary

Joint

Installation

Procedure

(Option

001)

.16

5-5.

Ordering

Information.

5-7.

Direct

Mail-Order

System.1^

Factory

Returns

SAFETY

SYMBOLS

The

following

safety

symbols

are

used

throughout

this

manual

and

the

instrument.

Familiarize

yourself

with

each

the

symbols

and

its

meaning

before

operating

this

instrument.

Instrurtion

manual

symbol.

The

instrument

will

marked

with

this

symbol

when

necessary

for

the

user

refer

the

instruction

manual

order

protect

the

instrument

against

damage.

Location

pertinent

information

within

the

manual

indicated

use

this

symbol

the

table

contents.

Indicates

dangerous

voltages

are

present.

extremely

careful.

^UTiOIM

CAUTION

sign

denotes

hazard.

calls

attention

procedure

which,

correctly

performed

adhered

to,

could

result

damage

destruction

the

instrument.

not

proceed

beyond

CAUTION

sign

until

the

indicated

conditions

are

fully

understood

and

met.

rWARNING

WARNING

sign

denotes

hazard.

calls

attention

procedure

which,

correaly

performed

adhered

to,

could

result

injury

loss

life.

not

proceed

beyond

WARNING

sign

until

the

indicated

conditions

are

fully

understood

and

met.

11941

OPERATION

NOTE

1-1.

GENERAL

INFORMATION

1-2.

Description

1-3.

The

11941A

Close-Field

Probe

hand-held

electromagnetic

field

sensor

designed

make

repeatable,

calibrated

magnetic

field

measurements

from

kHz

MHz.

optimized

for

the

location

and

measurement

sources

electromagnetic

interference

(EMI)

electronic

equipment

The

11941A

can

also

used

localized

magnetic

field

source

when

operated

conjunction

with

appropriate

signal

generator,

thereby

allowing

circuit-board-level

susceptibility

testing

instruments.

1-4.

Accessories

Supplied

1-5.

The

following

three

accessories

are

included

with

the

probe:

•

One

(6.6

ft.)

double-shielded

cable

with

two

SMA

(male)

end

connector,

Part

Number

8120-4811

•

One

Type

(male)

SMA

(female)

adapter,

Part

Number

1250-1250

•

One

BNC

(male)

SMA

(female)

adapter,

Part

Number

1250-1700

The

double-shielded

cable

(RG-223),

reduces

measurement

errors

high

field

impedance

environments

minimizing

current

leakage

through

the

braided

coaxial

outer

conductors.

For

less

demanding

applications,

the

use

flexible

single-shielded

cable

type

sufficient

(e.g.,

RG-58,

RG-174).

1-6.

Options

1-7.

Three

options

are

available

for

the

11941

1-8.

Option

001

includes

factory-installed

SMA

Rotary

Joint

connector,

Part

Number

0955-0323,

Check

Digit

(See

figure

17.)

The

connector

increases

handling

flexibility

the

probe

removing

any

rotational

torque

from

the

interconnect

cable.

The

rotary

joint

especially

useful

when

making

measurements

using

the

double-shielded

cable.

Section

5-4

includes

instructions

installing

the

rotary

joint

1-9.

Option

003

consists

the

11941A

Close-Field

Probe

without

the

double-shielded

cable

the

two

adapters.

1-10.

Option

910

includes

additional

Operation

Note.

1-11.

Initial

Inspection

1-12.

the

shipment

contents

are

incomplete

damaged,

notify

the

nearest

Hewlett-Packard

office.

the

shipping

container

damaged,

the

cushioning

material

shows

signs

stress,

notify

the

carrier

well

the

Hewlett-Packard

office.

Keep

the

shipping

materials

for

the

carrier’s

inspection.

The

office

will

arrange

for

repair

replacement

without

waiting

for

claim

settlement

1-13.

See

Paragraph

4-1

for

Operation

Verification.

11941

OPERATION

NOTE

2-1.

SPECIFICATIONS

2>2.

Specifications

for

th~e

11941A

are

listed

table

asterisk

(*)

placed

after

entry

indicates

supplemental

characteristic.

Supplemental

characteristics

are

not

specifications,

but

are

characteristics

included

additional

information

for

the

user.

2-3.

Figure

illustrates

the

characteristic

frequency

response

for

the

11941A

Close-Field

Probe.

See

section

3-4,

Antenna

Factors,

for

additional

information.

3-1.

OPERATION

3-2.

Theory

Operation

3-3.

The

11941A

balanced

magnetic-field

sensor

that

provides

output

voltage

proportional

the

strength

the

magnetic

field

its

tip.

Radiated

magnetic

fields

couple

directly

the

11941A

and

produce

output

signal;

radiated

electric

fields

also

couple

the

1194

lA^

but

not

produce

output

voltage

due

the

construction

the

probe.

The

11941A

uses

dual-loop

sensor

and

balun

reject

electrically-coupled

signals.

These

loops

are

illustrated

figure

which

shows

the

probe

with

its

non-removable

protective

tip

cover

cut

away

for

clarity.

The

probe

does

not

rectify

the

input

signal;

provides

both

amplitude

and

frequency

information.

ideally

suited

for

use

with

spectrum

analyzer.

The

11941A

circuitry

passive

and

therefore

only

contributes

thermal

noise

any

measurement

system.

Inspect

the

probe

tip

for

damage

before

using,

and

not

use

the

probe

the

protective

tip

cover

missing

damaged.

3-4.

Antenna

Factors

3-5.

The

specific

antenna

factors

each

11941A

are

measured

within

±2

five

frequencies:

kHz,

100

kHz,

MHz,

and

MHz.

This

calibration

Information

listed

the

bottom

cover

each

probe.

The

antenna

factors

are

given

the

units

dB(uA/m/uV).

calculate

the

magnetic

field

strength

dB(UA/m)

specific

frequency,

add

the

amplitude

the

measured

voltage

dB{uV)

(as

indicated

the

spectrum

analyzer)

the

antenna

factor

for

that

specific

frequency.

compensate

for

cable

losses

and

preamplifier

gains,

add

the

losses

and

subtract

the

gains

(in

dB).

Refer

the

following

equation:

H-Field

Strength

(dB

Vsa

where

VsA

voltage

dBuV

measured

analyzer

11941A

Antenna

Factor

loss

gain

between

11941A

and

spectrum

analyzer

(Positive

value

loss,

negative

value

gain.)

11941

OPERATION

NOTE

Table

11941A

Specifications

11941

OPERATION

NOTE

3-6.

Use

the

data

included

figure

for

interpolating

antenna

factors

between

the

five

calibration

frequencies

included

the

probe’s

calibration

table.

3-7.

Power

Density

and

Electric

Field

Calculations

3-8.

The

11941A

measures

magnetic

field

strength.

estimate

the

magnitude

the

associated

electric

field

can

made

field

impedance

assumed.

example

given

below

using

377-ohm

field

impedance.

Radiated

power

density

can

also

estimated,

assuming

that

the

fields

are

phase

and

that

the

field

impedance

377

ohms.

E-Field

Strength

(dB

Vsa

log(377)

”

***

51.5

Power

Density

Vsa

+AF

-104.3

EXAMPLE:

cm^

where

VsA

voltage

dBfxV

measured

analyzer

11941A

Antenna

Factor

loss

gain

between

11941A

and

spectrum

analyzer

(Positive

value

loss,

negative

value

gain.)

MHz,

measured

Vsa

“

65.3

dB/itV.

Let

and

then

65.3

+39+

51.5=

155.8

dB^V/m

61.7

V/m

s(dB^)=

65.3

39-

104.3

0dB2^

cmy

cm^

cm*

3-9.

Localized

Field

Source

3-10.

The

probe

can

also

used

localized

magnetic

field

source

for

locating

susceptible

components

circuit

board.

reciprocal

device:

that

is,

current

fed

into

the

probe

will

generate

magnetic

field

the

dual-loop

sensor.

The

specified

antenna

factors

cannot

used

estimate

the

magnitude

the

output

field.

Table

lists

characteristic

field

strengths

developed

(0.040

in.)

away

from

the

probe

tip,

using

incident

power

dBm

into

ohms.

CAUTION

Power

applied

the

probe

must

not

exceed

the

maximum

Input

power

listed

table

damage

the

probe

will

result.

11941

OPERATION

NOTE

DUAL

LOOPS

Figure

Magnetic

Field

Orientation

for

Maximum

Coupling

Table

Characteristic

Magnetic

Field

Strengths

Frequency

(MHz)

Input

Power

(Into

son)

Magnetic

Field

Strength

(fi),

(pA/m)

0.009

dBm

122

0.100

dBm

120

dBm

OdBm

101

3*11.

Test

Setups

3*12.

The

11941A

operates

either

localized

magnetic

field

probe

localized

magnetic

field

source.

The

following

paragraphs

describe

different

applications

and

test

setups

for

the

probe.

Table

lists

the

recomrhended

test

setup

equipment

used

these

examples.

Any

equipment

that

satisfies

the

critical

specifications

listed

table

may

substituted

for

the

recommended

equipment

When

used

probe,

sure

add

the

antenna

factors

and

cable

losses

the

signal

levels

indicated

the

spectrum

analyzer.

preamplifier

used

increase

measurement

sensitivity,

subtract

its

gain

from

the

displayed

signal

level

WARNING

The

dielectric

material

the

tip

the

probe

has

characteristic

breakdown

voltage

kV.

prevent

damage

the

probe

and/or

personal

Injury

the

user,

the

probe

should

not

used

where

potential

over

available.

11941

OPERATION

NOTE

3-13.

Localized

Emissions

Test

Setup:

figure

illustrates

typical

configuration

used

for

localizing

EMI

emissions.

See

section

3-16

for

proper

probe

placement

8530A

SPECTRUM

ANALYZER

DEVICE

UNDER

TEST

00^0

aoooD

■

■■

Qoaoa

•

“

•

■■

nt-ir-inn

“

♦

11941A

AMPLIFIER

(RECOMMENDED)

OUTPUT

Figure

Localized

Emissions

Test

Setup

Table

Recommended

Test

Setup

Equipment

instrument

Critical

Specifications

Recommended

Model

Spectrum

Analyzer

Frequency

Range:

kHz-30

MHz

8562A

(100

Hz-2.9

GHz)

8566B

(100

Hz-300

GHz)

8567A

(10

kHz-1.5

GHz)

8568B

(100

Hz-1.5

GHz)

8590A

(10

kHz-1.5

GHz)

Option

H51,

Close-Field

EMC

Feature

Set

lOOA

(100

Hz-2.9

GHz)

Option

002

Tracking

Generator

Mt-.

Frequency

Range:

kHz-30

MHz

8444A

(0.5-1500

MHz)

Option

059.

For

use

with

8566B,

8567A,

and

8568B

70300A

(100

Hz-2.9

GHz)

For

use

with

lOOA

Signal

Generator

Frequency

Range:

kHz-30

MHz

8660C

(10

kHz-2.6

GHz)

8662A

(10

kHz-1280

MHz)

Preamplifier*

Frequency

Range:

kHz-30

MHz

Gain:

>20

8447A

kHz-50

MHz)

Option

H64

8447F

kHz-1.3

GHz)

Option

H64

85685A

Preselector

may

substituted

8566B,

8567A,

8568B

spectrum

analyzer

used.

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