Agilent 85025B Users and Service Manual

User’s and Service Guide

Agilent Technologies

85025A/B/D/E Detectors

Agilent Part Number: 85025-90063

Printed in USA

September 2002

Supersedes September 1995

Hewlett-Packard to Agilent Technologies Transition

This documentation supports a product that previously shipped under the Hewlett-Packard company brand name. The brand name has now been changed to Agilent Technologies. The two products are functionally identical, only our name has changed. The document still includes references to Hewlett-Packard products, some of which have been transitioned to Agilent Technologies.

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Safety Notes

The

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Documentation Description

This manual contains information on operating, testing, and servicing the

Agilent 85025A/B/D/E detectors

.

v

Installation

2

Refer to

detector

Initial

1.

2.

3.

4.

If

any

Incomplete

Mechanical

Failed

If you

material,

the

following

or

subject

Inspection

Check

Either

the

shipping

that

connector

the

detector

perform

measurement

of

the

following conditions

shipment.

damage

electrical test.

nd damage

keep

the

in

them

information

it

to

excessive

container

shipment

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cable

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electrically:

the

operator's

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defect.

or signs

for

the

and

is

complete

and

detector

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erformance

of stress

carrier's

when

using

mechanical

shock.

packaging

.

body

for

check

in

Chapter

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ests

exist, notify

to

the

shipping

inspection. Agilent

the

detector

material

mechanical

3,

."

your

nearest

container

for

\Operation,"

does

claim settlement before arranging for repair or replacement.

.

Do

damage

damage.

Agilent

or

not

the

drop

.

or

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wait

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make

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Agilent 85025A/B/D/E Installation 2-1

Electrostatic Discharge

ESD

can

100

V

can

disconnect

grounding

contact

pins

damage

destroy

strap

a

device

.

the

.

Never

highly

a

detector

.

Use

this

touch

sensitive

.

ESD

detector

the

(ESD)

circuits

in

this device;

damage occurs

at

a static-safe

input connector

charges as

most often

as you

workstation and

center contacts

low as

connect or

wear a

or the

cable

Static-Safe

Figure 2-1

you

can use

illustrates

A conductive

W

either

table

oor mat

ork

a

together

mat

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static-safe

or

and

heel-strap

station

separately:

wrist-strap

using

two

types

combination.

of

ESD

protection

that

Figure 2-1. Example of a Static-Safe W

ork Station

2-2 Installation Agilent 85025A/B/D/E

Static-Safe

Practices

Before

device

Discharge

device

the

test

protects

P

ower

The

scalar

Mating

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able

1-7

(part

number

inspection,

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port,

ground

static electricity

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test

(through

or another

equipment

a resistor

exposed ground.

circuitry.

Requirements

network

analyzer

Connectors

lists

connector

08510-90064

and

gaging

mechanical

)

of

connectors

or

making

yourself as

from a

supplies

provides

a connection

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device before

of at

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power

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information

.

to a

possible from

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to

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on

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ouch

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outer

shell

electricity

.

Connector

Care

maintenance

of

and

,

Connecting

1.

The

85025A/B/D/E

8757

series scalar

insert

analyzer

2. T

the multi-pin

.

o secure the DC connector in the analyzer

3. Connect the RF input to the

outer

shell clockwise

the

Detector

cables

plug

network analyzer

(DC) connector

.

into

the

connectors

.With

into the

the cable

A input

, turn the

on

the front

plug

on the

outer

panel of

key

downward,

front

panel

shell clockwise

test device by turning the male connector's

of

the

.

Agilent 85025A/B/D/E Installation 2-3

Operation

3

Caution

Electrostatic

circuits

your

ESD

a

wear

center

Do

than

in

this

detector

damage occurs

device

.

Use

a

grounding

contacts

not

apply

6

10

VDC

electrically

Before

discharge

on

most

large

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you

the

cable's

important

antenna.

not

drop the

the

discharge

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this

or

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damage

connect

static

outer

if

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(ESD)

charges

most

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strap

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the

cable

than

detector

the

detector

a

RF

electricity

conductor

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often

at

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low

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you

a

static-safe

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dBm

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.

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to

the

that

may

to

instrument

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the

highly

as

100

V can

connect

workstation

the

input

pins

.

power

or

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,

accumulated

ground.

or

connected

to mechanical

sensitive

destroy

or

disconnect

and

connector

more

can

always

This

to

shock.

is

a

Agilent 85025A/B/D/E Operation 3-1

Features

Figure

Operating

The 85025A/B/D/E

square wave

detection mode

analyzer to

In

A

C

detection

with a 27.778 MHz

this signal to produce

Theory

can detect

amplitude modulated

,the

detector provides

interpret and

mode

,

and

display.

square wave

a 27.778 MHz signal with a peak-to-peak voltage that

corresponds to the magnitude of

In DC detection mode

,no

85025A/B/D/E converts the RF signal into an

detector chops the DC voltage at a 27.778 kHz rate

is then amplied. The amplied signal simulates the signal produced by A

3-1.

Detector

either unmodulated

RF signals

a 27.778

RF

or

microwave

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eatures

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in A

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MHz

signal is

signals

mode

.

square

amplitude

in

In

wave

either

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mode

A

C

or

signal

modulated

or

for

. The detector demodulates (envelope detects)

the RF signal at the detector input.

modulation is required. The detector diode in the

equivalent DC voltage

.The

, and this chopped signal

C

DC

the

detection.

3-2 Operation Agilent 85025A/B/D/E

Measurement System

With

an

8757

system

of

conguration

the

analyzer

measurement.

series

scalar

requires

system

However

and

,

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network

special

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required.

DC

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mode

Conguration

analyzer

attention.

are

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DC

using

an 85025A/B/D/E

A

C

further requirements

mode operation,

mode

is the

a series

detector,

default state

to initiate

of keystrokes

a

is

DC detection

characterize

typical

oscillator/RF plug-in

1.On

2. DC

the

detection

select

When

is automatically

A

ccurate DC

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When

you

detector zeroing

temperature uctuations

oers

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measurement

analyzer

N

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make

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N

NN

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N

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procedure

greater

power

measurement

modulation-sensitive

setup

for

as the

press

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must

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softkey

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source

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is

OFF

50 GHz,

.

5

.

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selected,

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detection

measurements

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compensate

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zeroing

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the

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the

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the

procedure

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Agilent

detector(s).

analyzer

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ability

Figure

3-2

8350B

press

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SYSTEM

wave modulation

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perform

of

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drift

small

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to

depicts

sweep

5

and

this

and

voltages

from the diode detector that would otherwise cause amplitude measurement

errors at low (

noise level with no RF signal applied (the system's noise



40 dBm) power levels

. Zeroing also establishes the displayed

oor).

a

Autozero

Pressing the autozero softkey

AUTOZRO

output and automatically zeros the detector

NNNNNNNNNNNNNNNNNNNN

NNN

switches OFF the source RF signal

.

Agilent 85025A/B/D/E Operation 3-3

The

repeat

the

autozero.

function

sweeper

autozero

Y

ou

because

to

perform

function

must

the

use

a

analyzer

autozeroing.

softkey

GPIB

must

N

NN

REPT

(

interfaced

be

able

NN

N

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sweeper

to

switch

N

NN

ON/OFF

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N

)

periodically

to

take

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the

repeats

advantage

RF

output

of

this

the

Manual

meter

1.

Remove

2.

On the

Refer

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softkeys

In

the

accuracy

The

Trace

The

The source

To

increase the

N

DET

zeroing

1.

On the analyzer

port). Press

zero

.

to

.

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.

equipment

detector

oset

averaging

source

N

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the

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analyzer

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the

regard

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harmonics

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accuracy of

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to

properly

detector

, press

4

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by

from

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NN

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MANUAL

press

in

the

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85025A/B/D/E

to

these

had

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procedure

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enabled

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set

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CAL

5

. This ensures the 0 dB oset.

MANUAL

the

N

A

gilent

or

A

gilent

for

detailed

specications

30

minute

with

on

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below

absolute power

the

system response

these steps

NN

N

DET OFFSET

5

N

softkey

detector's

to

perform

T

echnologies

T

echnologies

information

is

specied

,

warmup

has

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a

calibrated

analyzer

0

40 dBc

to set

N

NN

N

NN

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RF

the

performed.

at

.

level

NN

N

DET A

,

is

similar

input.

zeroing.

8757C/E

for

absolute

following

period.

0 dBm,

low power

measurements

to a

the detector

N

NN

N

(or the appropriate input

8757D

on

these

conditions

50 MHz

0dBm

to

zeroing

Scalar

power

levels,

signal. After

oset:

Network

and

level

signal

as

,

select

a

power

Network

other

apply:

applied.

required.

2. Connect the detector to the POWER REF output of a calibrated power meter

such as an Agilent 436A or 438A. Switch the POWER REF output ON.

NNNNNNNNNNNNNN

5

MORE

NNNNNNNNNNNNNNNNNNNN

5

AUTOSCALE

3.

Press

4

CURSOR

4.

Press

4

CAL

3-4 Operation Agilent 85025A/B/D/E

NNNNNNNNN

.

NNNNNNNNNNNNNN

NNNNNNNNNNNNNNNNNN

DET OFFSET

.

,

Agilent 85025B Users and Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Operating Environment

Installation

Electrostatic Discharge

Operation

Features