Hp 8555a Service manual

HEWLETT

PACKARD

OPERATING

AND

SERVICE

MANUAL

SPECTRUM

ANALYZER

RF

SECTION

8555A

SERIAL

NUMBERS

This manual applies directly

to

serial numbers

prefixed

l436A.

With modifications described in Section VII this

manual also applies

to

serial numbers prefixed

987,

1043A,

1114A,

1116A,

1138A,

1143A,

1203A,

1219A, 1232A, 1311A,

1325A,

and

1326A,

1343A,

1416A,

and

1429A.

For

additional

important

information

about

serial

numbers see

"Instruments

Covered

by

Manual"

in

Section

I.

COMPANY

1971,1974

1400

FOUNTAIN

GROVE

PARKWAY,

SANTA

ROSA.

CALIFORNIA,

95404,

U.S.A.

MANUAL

PART

NUMBER

08555·90027

MICROFICHE

PART

NUMBER

08555·90028 Printed:

AUGUST

1974

Model8555A

Warnings/Cautions

SAFETY I

wARNINGS

I

GROUNDING

If

this

instrument

is

to

be

energized via

an

auto-

transformer for voltage

reduction,

make sure

the

common

terminal

is

connected

to

the

earthed

pole

of

the

power

source.

BEFORE SWITCHING ON THIS INSTRUMENT,

the

protective

earth

terminals

of

this

instrument

must

be

connected

to

the

protective

conductor

of

the

(mains)

power

cord.

The

mains plug shall only

be

inserted in a

socket

outlet

provided with a

protective

earth

contact.

The

protective

action

must

not

be negated by

the

use

of

an

extension

cord

(power cable)

without

a protective

conductor

(grounding).

Make sure

that

only fuses

with

the

required

rated

current

and

of

the

specified

type

(normal blow,

time

delay, etc.) are used for replacement.

The

use

of

repaired fuses

and

the

short-circuiting

of

fuse

holders

must

be avoided.

Whenever

it

is likely

that

the

protection

offered

by

fuses has been impaired,

the

instrument

must

be

made inoperative

and

be

secured against

any

unin-

tended

operation.

GROUNDING

BEFORE SWITCHING

ON

TI-IIS

INSTRUMENT,

ensure

that

all devices

connected

to

this

instrument

are connected

to

the

protective (earth) ground.

BEFORE SWITCHING ON THIS INSTRUMENT,

ensure

that

the

line

power

(mains) plug

is

con-

nected

to

a

three-conductor

line power

outlet

that

Any

interruption

of

the

protective

(grounding)

conductor

(inside

or

outside

the

instrument)

or

disconnecting

the

protective

earth

terminal

is likely

to

make this

instrument

dangerous.

Intentional

interruption

is

prohibited.

HIGH VOLTAGE

Any adjustment,

maintenance,

and

repair

of

the

opened

instrument

under

voltage should be

avoided as

much

as possible

and,

when

inevitable,

should

be

carried

out

only

by

a skilled

person

who

is aware

of

the

hazard involved.

Capacitors inside

the

instrument

may

still be

charged even

if

the

instrument

has

been

discon-

nected

from its source

of

supply.

Adjustments

and

Service described

herein

is

per-

formed with power supplied

to

the

instrument

while protective covers are removed. Energy avail-

able

at

many

points

may,

if

contacted,

result in

personal injury.

has a protective (earth) ground.

(Grounding

one

conductor

of

a

two-conductor

outlet

is

not

sufficient.)

LINE VOLTAGE SELECTION

BEFORE SWITCHING

ON

THIS INSTRUMENT,

make sure

the

instrument

is

set

to

the

voltage

of

the

power

source.

vii

General

Information

Model8555A

MODEL 8555A

Figure 1-1.

Model8555A

Spectrum

Analyzer

RF

Section

with

8552B

IF Section and

141T

Display Section

1-0

Model

8555A

General

Information

SECTION

I

GENERAL

INFORMATION

1-1. INTRODUCTION

1-2. This manual

contains

all

information

required

to

install,

operate,

test,

adjust

and

service

the

Hewlett-Packard Model

8555A

Spectrum

Analyzer

RF

Section. This section covers

instrument

identi-

fication, description, options, accessories,

specifica~

tions

and

other

basic

information.

1-3. Figure 1-1 shows

the

Hewlett-Packard Model

8555A

Spectrum

Analyzer

RF

Section with

the

Model 8552B

Spectrum

Analyzer

IF

Section

and

the

Model141

T Display Section.

1-4. The various sections in this manual provide

information as follows:

SECTION II, INSTALLATION, provides in-

formation relative

to

incoming inspection,

power requirements, mounting, packing

and

shipping, etc.

SECTION III, OPERATION, provides infor-

mation relative

to

operating

the

instrument.

SECTION IV, PERFORMANCE TESTS, pro-

vides

information

required

to

ascertain

that

the

instrument

is performing in accordance

with published specifications.

SECTION V, ADJUSTMENTS, provides infor-

mation required

to

properly adjust and align

the

instrument

after

repairs are made.

SECTION VI, REPLACEABLE PARTS, pro-

vides ordering

information

for all replaceable

parts and assemblies.

SECTION VII, MANUAL CHANGES, nor-

mally will

contain

no

relevant

information

in

the

original issue

of

a manual. This section

is

reserved

to

provide back-dated

and

up-dated

information in manual revisions or reprints.

SECTION VIII, SERVICE, includes all in-

formation required

to

service

the

instrument.

1-5. On

the

title

page

of

this manual, below

the

manual part number, is a "'Microfiche" part

num~

ber. This

number

may

be

used

to

order

4 x 6-inch

microfilm transparencies

of

the

manual. Each

microfiche

contains

UIJ

to

60

photo-duplicates

of

the

manual pages.

The

microfiche package also

includes

the

latest

Manual Changes

supplement

as

well

as

all

pertinent

Service Notes.

1-6. WARNINGS AND CAUTIONS

1-7. WARNING. Ensure

that

the

Spectrum

Analy-

zer

and any

device\

connected

to

it

are

both

properly

grounded

to

the

same

power

line ground.

An

interrupted

path

from

earth

ground

to

an

mstrument

chassis safety

ground

(an

open

third-

wire

ground

lead in a cord;

for

example,

see Figure

1-2 below) can develop a

potential

(V) equal

to

one

half

of

the

power line voltage. This

may

cause

a shock hazard as well as damage

to

the

instru-

ment.

~

v

iC

HOT

1

..

LINE

OPENS

)AC

NEUTRAL

,I

-~

Figure 1-2. Circuit

if

.Equipment

Ground Lead Opens

1-8. CAUTION. The

input

circuits

of

the

Model

8555A

are susceptible

to

burnout

if

fed an exces-

sively high signal level.

To

avoid

costly

repairs

and

unnecessary

down

time

the

following precautions

must

be

taken:

1.

Use maximum

attenuation

when

applying

signals

of

unknown

amplitude.

2. Ensure

that

the

Spectrum

Analyzer

Display Section

and

any

signal source

to

be

coupled to

the

Spectrum

Analyzer are

both

connected

to

the

same power-line

ground

before

connecting

an

RF

cable

to

the

8555A

RF

Input.

It

has

been

estab-

lished

by

HP

that

floating

either

instru-

ment

from ground

may

cause damage

to

the

Spectrum Analyzer

input

mixer

assembly.

3. The

input

attenuation

setting

should

not

be

changed while

de

is

applied

to

the

RF

Input.

4.

Do

not

connect

impulse generators

to

the

Model

8555A

RF

Input

unless

they

are

connected

through a Model

8445A

Pre-

selector.

1-1

General

Information

5. Observe

the

following

maximum

input

levels:

Maximum

PO:wer

Volts

Input

Levels

dBm

Watts

De

Rms

Peak

Input

.01·18

GHz

+33

1

2'

±20

2

10

14.4

Connector

Incident

on

In-

+10

10

mW

±20

2

0.707

1.0

put

Mixer

1

The

Input

Attenuation

Control

must

be

in

the

30

dB

or

greater

position

when

applying

+33

dBm

or

input

Mixer

will

be

dam·

aged.

The

power

levels

listed

apply

for

peak

or

average

power.

2

Do

not

exceed

±20

volts

de.

Apply

only

de

voltages

with

rise

times

less

than

10

6

volts

per

second,

1-9. INSTRUMENTS COVERED BY

MANUAL

1-10. This

instrument

has

a

two-part

serial

number

(see Figure 1-3).

The

first

four

digits

and

the

letter

comprise

the

serial

number

prefix.

The

last five

digits form

the

sequential

suffix

that

is

unique

to

each

instrument.

SERIAL

PREFIX

Figure 1-3.

Instrument

Identification

The

contents

of

this

manual

apply

directly

to

instruments

having

the

same

serial

number

pre-

fix(es) as listed

under

SERIAL

NUMBERS

on

the

title

page.

1-11. An

instrument

manufactured

after

the

print-

ing

of

this

manual

may

have a serial prefix

that

is

·not

listed

on

the

title

page. This

unlisted

serial

prefix indicates

that

the

instrument

is

different

from

those

documented

in

this

manual.

The

manual. for this

instrument

is

supplied

with

a

yellow Manual Changes

supplement

that

contains

"change

information"

that

documents

the

differ-

ences.

1-2

Model8555A

1-12.

In

addition

to

change

information,

the

sup-

plement

may

contain

information

for

correcting

errors in

the

manual.

To

keep

this

manual

as

current

and

accurate as possible,

Hewlett-Packard

recommends

that

you

periodically

request

the

latest

Manual Changes

supplement.

The

supple-

ment

for

this manual is

keyed

to

this

manual's

print

date

and

part

number,

both

of

which

appear

on

the

title

page.

Complimentary

copies

of

the

supplement

are available

from

Hewlett-Packard.

1-13.

For

information

concerning

a serial

number

prefix

not

listed

on

the

title page

or

in

the

Manual

Changes

supplement,

contact

your

nearest

Hewlett-

Packard

office.

1-14. DESCRIPTION

1-15.

The

HP Model

8555A

Spectrum

Analyzer

RF

Section

is

shown

in Figure 1-1

with

the

Model

8552B

Spectrum

Analyzer

IF

Section

and

the

Model

141

T Display

Section.

Table

1-1, Specifica-

tions,

and

Table 1-2,

Supplemental

Performance

Characteristics, are for

the

8555A

RF

Section

when

used with

an

8552A!B

IF

Section

and a

140-series Display Section.

1-16.

The

8555A

plug-in

is

the

microwave

RF

Section

for

use

with

the

8552-series

IF

section

and

the

140-series display

section.

Together

they

comprise

a receiver

that

electronically

scans

an

input

signal

and

provides a visual display

in

the

frequency

domain.

Input

signal

amplitude

is

plotted

on

the

CRT

as a

function

of

frequency.

The

amplitude

(Y-axis)

of

the

CRT

is

calibrated

in

absolute

units

of

power

(dBm)

or

voltage

(pV/mV)

(50-ohm

system): accordingly,

absolute

and

rela-

tive

measurements

of

both

amplitude

and

fre-

quency

can

be

made.

1-17.

The

analyzer

RF

and

IF

sections

form

a

highly sensitive

super-heterodyne

receiver

with

spectrum-scanning capabilities over

the

frequency

range

of

10

MHz

to

40

GHz in

14

frequency

bands.

The

analyzer

presents a

calibrated

CRT

display

up

to

2 GHz wide. Absolute

calibration

accuracy

is

maintained

from

10

MHz

to

18.0

GHz

in

10

bands,

using

internal

mixing.

The

frequency

range

from

12.4

GHz

to

40

GHz is covered

in

4

bands

through

the

use

of

external

mixers.

1-18.

Instrument

controls

are arranged so

that

the

operator

can

identify,

type,

and

measure

signal

parameters

with

a

minimum

of

switching.

For

wide-spectrum

analysis,

the

operator

can

choose

a

preset

scan

width

covering

the

full

range

of

each

frequency

band.

For

a

more

detailed

study,

the

spectrum

width

can be progressively

narrowed

to

Modei8555A

as little as 2 kHz/div,

or

the

scanning capabilities

can

be

eliminated

altogether

to

use

the

instrument

as a fixed-tuned receiver. A

300kHz

IF

bandwidth

is automatically selected

for

full-scan operation;

for variable-scan and fixed

frequency

operation,

bandwidths

as narrow as

100Hz

can

be

selected. A

single switch will

automatically

enable

the

first LO

tuning

stabilization circuit

when

scan

widths

of

100

kHz

per

division,

or

less, are selected. A signal

identifier circuit,

controlled

by

an

on/off

switch,

allows

the

operator

to

quickly

determine

the

har-

monic mixing

mode

and

select

the

appropriate

frequency

band.

The signal identifier can be

enabled for

scan

widths

of

1 MHz

per

division

or

less.

1-19. OPTIONS

1-20.

Option

001.

Replaces

type

N

with

type

AP.C-7

connector.

1-21.

Option

002

for

the

Model

8555A

is a limiter

which can

be

installed

between

the

RF

Section's

INPUT

port

and

the

input

attenuator

to

protect

input

circuitry

from

being

overdriven. See

Appendix A

for

details regarding

Option

002.

1-22. ACCESSORIES SUPPLIED

1-23. The

RF

Section is

shipped

with

three

coaxial

type

terminations and

one

multi-section termina-

tion.

The coaxial

terminations

are installed

on

the

EXT

MIXER

port,

the

FIRST

LO OUTPUT

port

and

the

SECOND LO

OUTPUT

port.

(See Figure

3-1, items

17,

18,

and

19.)

The

multi-section

termination is shipped

taped

to

the

top

of

the

RF

Section. Install

the

multi-section

termination

on

the

Display Section rear panel. (See

item

3, Figure

3-3.)

The

coaxial

terminations

are HP

part

number

11593A

and

the

multi-section

termination

is

HP

part

number

08553-60122.

General

Information

1-24. EQUIPMENT REQUIRED BUT NOT

SUPPLIED

1-25.

The

8555A

Spectrum

Analyzer

RF

Section

must

be

mated

with

an 8552-series

Spectrum

Analyzer

IF

Section and

one

of

the

140-series

Display Sections

or

140-series Oscilloscope Main-

frames

before

the

units can

perform

their

function

as a

spectrum

analyzer.

The

140S/140T/143S

Dis-

play

Sections

are

equipped

with

a fixed-persis-

tence/non-storage

CRT, whereas

the

141S

and

141

T Display Sections are

equipped

with

a

variable-persistence storage CRT. Overlays,

to

provide

LOG and LINEAR graticule scales, are

available

for

use

with

the

standard

140A

and

141A

Oscilloscope Mainframe.

1-26.

Operating

accessories

for

use

with

the

8555/8552/140

Spectrum

Analyzer

are

listed

in

Table

1-3. Operating accessories

include

a wave-

guide

mixer,

adapters, filters

and

a

frequency

comb

generator.

An

external

waveguide

mixer

and

appropriate

adapters

are

required

over

the

fre-

quency

range

of

18

to

40

GHz.

1-27.

WARRANTY

1-28.

The

8555A

Spectrum

Analyzer

RF

Section

is

warranted

and certified

as

indicated

on

the

inner

front

cover

of

this manual.

For

further

information

contact

the

nearest Hewlett-Packard Sales

and

Service Office; addresses are provided

at

the

back

of

this

manual.

1-29. RECOMMENDED TEST EQUIPMENT

1-30. Tables 1-4

and

1-5 list

the

test

equipment

and

test

equipment

accessories

required

to

check,

adjust,

and

repair

the

8555A

Spectrum

Analyzer

RF

Section.

1-3

General

Information

Mode!8555A

Table 1-1.

8555A/8552A/8552B

Specifications

1-4

FREQUENCY SPECIFICATIONS

FREQUENCY RANGE

Tuning Range

With internal mixer: 0.01 -18.00 GHz.

With external mixer: 12.4 -

40

GHz.

Selectable continuous coarse (by means

of

push-

pull knob) and fine tuning determine display

center frequency.

Harmonic Mixing Mode

Signal Identification: Signal identifier separates

unknown input signal in center

of

CRT into

two images 2 divisions apart with image

on

left

slightly less in amplitude when the calibrated

frequency scale

is

advanced

to

the appropriate

band.

Scan Width

Full Scan: Inverted marker positioned

by

tuning

control identifies the frequency

that

becomes

the center frequency for scan width per divi-

sion and zero scan modes. The width

of

the

scan depends on mixing mode. Scan width = n

x 2000 MHz, where n is the mixing mode; e.g.,

for n = 2, scan width is 4 GHz.

Per Division: 16 calibrated scan widths from 2

kHz/div to 200 MHz/div in a 2, 5, 10

sequence.

Manual Scan: (Available with 8552B only.) Scan

determined by front panel control; continu-

ously variable across

CRT

in either direction.

Zero Scan: Analyzer becomes fixed tuned

re-

ceiver with frequency set

by

frequency and

fine tune controls and selectable bandwidths

by bandwidth control. Amplitude variations are

displayed versus time on CRT.

FREQUENCY ACCURACY

Dial

Accuracy: n x (±15 MHz) where n

is

the mix-

ing mode.

Scan Accuracy: Frequency

error

between two

points on

the

display is less than 10%

of

the indi-

cated separation.

Stability:

Total Analyzer Residual FM (Fundamental

Mixing)

Stabilized

<100Hz

peak-to-peak

Unstabilized

<10kHz

peak-to-peak

First

LO

residual FM typically 30 Hz.

Noise Sidebands: For fundamental mixing. More than

70 dB below

CW

signal, 50 kHz or more away from

signal, with 1 kHz

IF

bandwidth and

100Hz

video

filter.

RESOLUTION

Bandwidth Ranges: IF bandwidths

of

0.10

to

300

kHz provided in a 1, 3 sequence.

Bandwidth Accuracy: Individual IF bandwidth 3 dB

points calibrated

to

±20%. (10 kHz

bandwidth

±5%).

Bandwidth Selectivity:

60 dB/3 dB Bandwidth

Ratio

IF

Bandwidth 8552A 8552B

10

kHz -300 kHz

1kHz-

3kHz

0.1 kHz -0.3 kHz

20:1

25:1

20:1

11:1

AMPLITUDE SPECIFICATIONS

ABSOLUTE CALIBRATION RANGE

Measurement

Rang:e

,_[~~-~~ii:O"""""'i~~J

See

"Input

Specifications" for maximum

levels

to

INPUT .01 -18 GHz connector and

to

input

mixer.

Log Reference Level: From -130 dBm

to

+10

dBm, in 10 dB steps. Log reference level ver-

nier, 0 to -12 dB continuously.

Linear Sensitivity: From 0.1

11V/div

to

100

mV/div in a 1,2 sequence. Linear sensitivity

vernier 1

to

0.25 attenuation ratio continu-

ously.

Sensitivity

Average Noise Level: Specified for 1 kHz band-

width. Using lower bandwidths will improve

average noise level; e.g., use of 100 Hz band-

width will improve noise level

in

the 1.5

to

3.55 GHz frequency range from -117 dBm

to

-127 dBm max.

With INTERNAL Coaxial Mixer

Frequency Mixing

IF

Freq. Average

Range Mode (MHz) Noise Level

(GHz) (n) (dBm max.)

0.01-

2.05 1- 2050 -115

1.50 -3.55 1- 550 -117

2.07-

6.15

2-

2050 -108

2.60-

4.65 1+ 550 -117

4.11-

6.15 1+ 2050 -115

4.13

-

10.25

3- 2050 -103

6.17 -

10.25

2+

2050 -105

6.19 -

14.35

4- 2050 -

95

8.23 -

14.35

3+ 2050 -100

10.29 -

18.00

4+ 2050 -

90

With

11517

A EXTERNAL Waveguide Mixer and

Appropriate Waveguide Tapers

Frequency Range Average Noise Level (Typ.)

12.4 -18.0 GHz

-90

dBm

18.0 -26.5 GHz

-85

dBm

26.5 40.0 GHz

-75

dBm

Model8555A

General

Information

Table 1-1.

8555A/8552A/8552B

Specifications

(Continued)

Residual Responses: Referred

to

signal level

at

input

mixer

on

fundamental mixi·ng:

<-90

dBm.

Display Range

Log: 70 dB, 10 dB/div with 8552B 2 dB/div log

expand on a 16 dB.display.

Linear: From 0.1 mV

to

100 mV/div in a 1, 2

sequence on an 8-division display.

Display Uncalibrated Light: Panel light warns

operator

of

uncalibrated

amplitude

display if the

IF

or

video bandwidth selected is

too

narrow for

combination of scan width

and

scan time

se-

lected.

Input Attenuator Range:

0-

50 dB in

10

dB steps.

ABSOLUTE CALIBRATION ACCURACY

'I'he overall absolute calibration accuracy

of

the

spectrum analyzer

in

a particular application

is

a

function of the measurement technique. The follow-

ing

elements also affect absolute calibration accuracy:

Frequency Response: With 10 dB

input

attenuator

setting.

Frequency Mixing

IF

Freq. Frequency

Range Mode Response

(GHz) (n) (MHz) (dB

max.)

0.01-

2.05

1-

2050 ±1.0

1.50 -3.55

1-

550 ±1.0

2.07-

6.15

2-

2050 ±1.25

2.60-

4.65

1+

550 ±1.0

4.11-

6.15

1+

2050 ±1.0

4.13-

10.25

3-

2050 ±1.5

6.17.

10.25

2+

2050 ±1.5

6.19-

14.35

4-

2050 ±2.0

8.23-

14.35

3+

2050 ±2.0

10.29 -18.00

4+

2050 ±2.0

IF

gain variation with different bandwidth settings:

(at 20°C).

Log: ±0.5 dB.

Linear: ± 5.8%.

Amplitude Display: Log ±0.25 dB/dB

but

not

more

than ±1.5

dB

over the full 70 dB display range.

Linear: ±2.8% of full 8-division deflection.

Input

RF

Attenuator: Frequency response typically

±0.6 dB from 10

MHz

to 18 GHz.

Log

Reference Level: Accurate to ±0.2

dB

(±2.3%

Linear Sensitivity).

Log

Reference

Level

Vernier: Accurate to ±0.1 dB

(1.2%) in 0, -6, and

-12

dB positions; otherwise,

±0.25 dB (±2.8%).

Calibrator Output: Amplitude

·30

dBm, ±0.3 dB.

Frequency 30

MHz,

±0.3 MHz (8552A),±3 kHz

(85528).

INPUT SPECIFICATIONS

Input Impedance: 50!2 nominal

(0.01-

18 GHz).

Reflection Coefficiertt:<0.130 (1.30 SWR) for input

RF

attenuator

settings

~10

dB.

Maximum

Input

Level:

(-~~:0~~

DO

NOT EXCEED THE FOLLOWING

MAXIMUM

INPUT LEVELS:

Max-

imum

Input

Levels

dBm

Watts

DC

Rms

Peak

Input

0.01

-

18

GHz

+33

2

±20

10

14.14

Con

nee-

tor

Incident

1.0

on

+10

Input

10mW

±20

0.707

Mixer

1

The

INPUT

ATTENUATION

control

must

be

in

the

30

dB

or

greater

position

when

applying

+33

dBm

or

input

mixer

will

be

damaged.

The

power

levels

listed

apply

for

peak

or

average

power,

2

Do

not

exceed

±

20

volts

de.

Apply

only

de

voltages

with

rise

times

less

than

106

volts

per

second.

Do

not

change

INPUT

ATTENUATION

levels

when

devol-

tages

are

applied

to

RF'

INPUT

Connector.

RF Input Connector: Type N female.

External Mixer

Input

Connector:

BNC

female;

LO

power transfer to external mixer through connec-

tor

as

well

as

2.05 GHz

IF

signal return to

spectrum analyzer.

LO

power typically 0 dBm.

SCAN TIME SPECIFICATIONS

Scan Time: 16 internal scan rates from 0.1 ms/div to

10

sec/div

in

a

1,

2, 5 sequence.

Scan Time Accuracy: 0.1 ms/div to

20

ms/div, ±10%,

50

ms/div

to

10 sec/div, ±20%.

GENERAL

SPECIFICATIONS

Power Requirements: 115 or 230 volts±10%, 50 ·

60

Hz, normally less than 225 watts (varies with

plug-in units used).

Dimensions: Model

140T

or 141T Display Section,

9-1/16 in. H (incl. feet) x 16-3/4 in. Wx 18-3/8 in.

D (229 x 425 x 467 mm). Model 1438 Display

Section, 21 in. H (incl.feet) x 16-3/4 in. W x

18-3/8 in. D (533 x 425 x 467 mm).

Weight:

Model

8555A

RF

Section:

Net

14lb

15 oz (6,8 kg).

Model

8552A

IF

Section: Net

9lb

(4,1 kg).

Model 8552B

IF

Section: Net

9Ib

(4,1 kg).

Model

140T

Display Section: Net

37lb

(16,8 kg).

Model141T

Display Section: Net 40 lb (18 kg).

Model 143S Display Section: Net

62lb

(28,1 kg).

1-5

General

Information

Model8555A

Table 1-2. Supplemental Performance Characteristics

SUPPLEMENTAL PERFORMANCE CHARACTERISTICS

~

AMPLITUDE CHARACTERISTICS

For typical sensitivity and frequency response versus

input frequency, see Figure 1-4.

Spurious Responses Due to Second

Harmonic

Dis-

tortion: With -40 dBm incident on input mixer.

Frequency

Range

0.1 6.2

GHz

6.2 · 10.3

GHz

10.3 · 14.4

GHz

14.4 . 18.5

GHz

2nd

Harmonic

Distortion

<-63

dB

<-69

dB

<-54

dB

<-51

dB

Spurious Responses Due to

Third

Order

Inter-

modulation Distortion: <-70 dB with -30 dBm

incident

on

input

mixer

and

signal separation

>1

MHz.

Video Filter:

Post~detection

filter used to

average

displayed noise.

With

8552A nominal band-

widths: 10 kHz and 100 Hz. With 8552B nominal

bandwidths: 10 kHz, 100 Hz, and 10

Hz.

Gain

Compression:

For

internal mixer

gain

compres-

sion

<1

dB

for

-10

dBm peak

or

average signal

level to input mixer. 11517A external mixer

(12.4 . 40 GHz) gain compression,

<1

dB

for

-15

dBm

peak or

average

signal

level to input mixer.

FREQUENCY CHARACTERISTICS

RESOLUTION

See Figure 1-5 for curves of typical 8555A/8552A

and 8555A/8552A spectrum analyzer resolution for

different bandwidths.

·20

JL\

1

:IIjll_

IJffillil

1/1//11

1

1111

J/1

\1

t!ypical Frequency Response j I I I If II

1/

1111

I ·

1111l±1

dB

±l;

~~=-_JL+25ds

1

-40

-60

w -80

0

II

I ll1

~

.

'II

I

'1

i

J.l

\I

ill

.lllif·

,I

t+

j

10kHz

BW

I

II

, r

~~~

I,

"

~

-100

~

:'i

1-6

I

lll111111kH•BW

Ill

I

1111

Ill

1111nfJJ/

I

l1llllllo.1

kH•

swill

I

11111111

I

Ill

~Ill

. I IIIIII[

IIIIIIIIUII\11111

I

LlJl

·120

·140

1 MHz

10

MHz

100 MHz 1 GHz 10

GHz

FREQUENCY

Figure 1-4. Typical

Spectrum

Analyzer

Sensitivity and Frequency Response

i

100

GHz

FREQUENCY DRIFT

Long Term Drift: (At fixed center frequency, after

2-hour warm-up).

Stabilized: ±3.0 kHz/10 min.

Unstabilized: ±25 kHz/10 min.

Stabilization Range: First

LO

can be automatically

stabilized

to

internal crystal reference for scan

widths of

100

kHz/div or less.

OUTPUT CHARACTERISTICS

First

LO

Output: +10 dBm; 50 ohms; 2.05 · 4.10

GHz.

Second

LO

Output: +10 dBm; 50 ohms; 1500

MHz.

Third

LO

Output:

+5

dBm; 50 ohms (rear panel);

500

MHz.

Pen Lift Output: 0 to 14 volts

(0

volts during scan

cycle). Output available

in

lnt

and single scan

modes and

Auto,

Line, and Video scan trigger.

Vertical Output: 100 mV per major division on

CRT

display;

output

impedance

<100

ohms.

SCAN CHARACTERISTICS

Scan

Mode:

Int: Analyzer repetitively scanned by internally

generated

ramp;

synchronization selected by

scan trigger.

FREQUENCY

Figure 1-5. Typical Spectrum

Analyzer

Resolution

(Fundamental Mixing)

Model8555A

General

Information

Table 1-2. Supplemental Performance Characteristics (

cont'd)

SUPPLEMENTAL PERFORMANCE CHARACTERISTICS (Continued)

Single: Single scan with reset actuated by front

panel pushbutton.

Ext: Scan determined by 0 to

+8

volt external

signal; scan input impedance >10 kr2.

Blanking: -1.5V external blanking signal required.

Manual: Scan determined

by

front panel control;

continuously variable across CRT in either direc-

tion (8552B only).

Scan Trigger: For Internal- Scan Mode, select

-between:

Auto: Scan free runs.

Line: Scan synchronized with power line

frequency.

Ext: Scan synchronized with

>2

volt (20 volt

max.) trigger signal (polarity selected by inter-

nally located switch

in

IF

Section).

Video: Scan internally synchronized

to

envelope

of

RF input signal (signal amplitude

of

1.5

major divisions peak-to-peak required on

dis-

play section CRT).

DISPLAY CHARACTERISTICS

Variable Persistence/Storage (Model 141T):

Plug-ins: Accepts Model 8550-series Spectrum

Analyzer plug-ins and Model 1400-series time

domain plug-ins.

Cathode-ray Tube:

Type: Post-accelerator storage tube, 9000 volt

accelerating potential; aluminized P31

phosphor; etched safety glass faceplate reduces

glare.

Functions Used with Time Domain Plug-ins Only:

Intensity modulation, calibrator, beam finder.

Special Order: Chassis slides and adapter kit: Fixed

slides, order

HP

Part Number 1490-0714; pivot

slides, order

HP

Part Number 1490-0718; slide

adapter kit for mounting slides on scope, order

HP

Part Number 1490-0721.

Persistence:

Normal: Natural persistence

of

P31 phosphor

(approximately 0.1 second).

Variable:

Normal Writing Rate Mode: Continuously vari-

able from less than 0.2 second

to

more than

one minute (typically

to

two

or

three

minutes).

Maximum Writing Rate Mode: Typically from 0.2

second to 15 seconds.

Erase: Manual; erasure takes approximately 350

ms;

CRT ready

to

record immediately after

erasure.

Storage Time: Normal writing rate; more than 2

hours at reduced brightness (typically 4 hours).

More than one minute at maximum brightness.

Fast writing speed; more than

15

minutes

(typically 30 minutes) at reduced brightness or

more than

15

seconds at maximum brightness.

Functions Used with Time Domain Plug-ins Only:

Intensity modulation, calibrator, beam finder.

Normal Persistence (Model140T):

Plug-ins: Same

as

141

T.

Cathode-ray Tube:

Type: Post-accelerator, 7300 volt potential

medium-short persistence

P7

phosphor;

tinted and etched safety glass faceplate

re-

duces glare. (Normal persistence of

P7

phos-

phor approximately 0.3 sec).

Graticule: 8 x

10

division (approximately 7,6 x

9,5 em) parallax-free internal graticule;

five

subdivisions per major division on horizontal

and vertical axes.

Functions Used with Time Domain Plug-ins

Only: Same as 141T.

Normal Persistence Large Screen Display (Model143S):

Plug-ins: Same

as

141T.

Cathode-ray Tube:

Type: Post-accelerator, 20

kV

accelerating

potential, aluminized

P7

phosphor. (Persis-

tence approximately

0.3

sec.)

Graticule: 8 x

10

divisions (approximately 8 x

10 inch) parallax-free internal graticule,

five

subdivisions per major division on horizontal

and vertical axes.

Functions Used with Time Domain Plug-ins

Only: Same as 1411'.

GENERAL

CHARACTERISTICS

CRT BASELINE CLIPPER: Front panel

control adjusts blanking

of

CRT trace

baseline

to

allow

n1ore

detailed analysis

of

low-repetition-rate signals and

im-

proved photographic records to

be

made.

Temperature Range: Operating,

0°

to +40°C;

storage, -40°

to

+75

C.

1-7

General

Information

Modei8555A

Table 1-3. Operating Accessories

Model Number Name Description

ll5t

7A Waveguide Mixer Mixes inputs from

12.4

to

40 GHz with frequencies

from first LO

HP

10503A Coaxial Cable terminated with BNC male

connectors supplied

with

Mixer

11518A

Adapter For mating 11517A Waveguide Mixer

to

P-band (12.4

to

18.0

GHz) system

11519A

Adapter

For

mating 11517A Waveguide Mixer

to

K-band (18.0

to

26.5 GHz) system

11520A

Adapter

For

mating

11517

A Waveguide Mixer

to

R-band (26.5

to

40

GHz) system

8406A

Frequency Comb

For

calibrating scan-width function; generates precision

Generator markers with 1-, 10-,

and

100-MHz spacing

8403A

Bandpass Filter Pass band:

1-2

GHz

8431A

Bandpass Filter Pass band:

2-

4 GHz

8432A

Bandpass Filter Pass

band:

4-6

GHz

8433A

Bandpass Filter Pass band:

6-8

GHz

8434A

Bandpass Filter Pass band:

8-

10

GHz

8435A

Bandpass Filter Pass band:

4-8

GHz

-·

8436A

Bandpass Filter Pass band:

8-

12.4

GHz

8444A

Tracking Generator Functions as a frequency response measurement system

when used with the

Spectrum

Analyzer. The system can

be used

as

a sweeper

or

signal generator

10

MHz

to

1.3

GHz.

8445B

Automatic Functions

to

reduce

or

eliminate signal intermodulation,

Preselector and multiple and spurious responses. Preselector

is

a low-

pass filter over

the

0

to

1.8

GHz range and a voltage

tuned

filter over

the

1.8

to

18

GHz range.

8447D

Preamp

100

kHz -1.3 GHz low noise preamp; improves sensitiv-

ity

or

average noise level

or

RF

Section approximately

18

dB

360

series Low-pass Filter

360A

cuts

off

at

700 MHz,

360B

cuts

off

at

1200

MHz

362A

series Low-pass Filter Acts like bandpass when used with waveguide; available

for

X,

P,

K,

R bands; eliminates signals outside normal

waveguide band

1-8

Model8555A

General

Information

Table 1-4. Test

Equipment

Required

Item

Minimum Specifications Suggested Model Use*

Frequency

Comb

Frequency markers spaced

1,

10,

100

HP

8406A

Comb

P,A

Generator

MHz

apart;

usable

to

4 GHz

Generator

Frequency Accuracy: ±0.01%

Output

Amplitude:>-

40 dBm

HF

Signal Generator Frequency Range:

1-50

MHz HP

606A/B

HF Signal p

Output

Amplitude:>

-20.dBm

Generator

Output

Amplitude

Accuracy: ±

1%

Frequency

Accuracy: ±

1%

Output

Impedance:

50

ohms

VHF Signal Frequency Range:

40-455

MHz HP

608E/F

VHF Signal

A,T

Generator

Frequency Accuracy: ±1% Generator

Output

Amplitude:>

-20 dBm

Output

Impedance:

50

ohms

UHF Signal Frequency Range:

450--1230

MHz HP

612A

UHF

Signal

T.

Generator

Frequency Accuracy:

±1%

Generator

Output

Amplitude:>

-20 dBm

Output

Impedance:

50

ohms

Signal

Generator

Frequency Range:

1.0-2.1

GHz HP

8614A/B

Signal

A,T

Frequency Accuracy: ±1%

Generator

Output

Amplitude:

> -20 dBm

Output

Impedance:

50

ohms

Signal

Generator

Frequency Range:

2.0-4.0

GHz HP

8616A/B

Signal A

Frequency Accuracy: ±1%

Generator

Output

Amplitude:>

-20 dBm

Output

Impedance:

50

ohms

Sweep Oscillator Frequency Range:

0.1-18

GHz HP

8690B

Sweep Oscil- p

Output

Amplitude:>

-20 dBm

lator

with

Output

Impedance:

50

ohms

8693A/B

RF

Unit

8694A/B

RF

Unit

8695A/B

RF

Unit

8699B

RF

Unit

Audio Oscillator Frequency Range:

10Hz-10kHz

HP

200CD

Audio p

Output

Amplitude:

2 Vrms Oscillator

Frequency Accuracy:

2%

Output

Impedance:

600

ohms

Test Oscillator Frequency Range:

10

kHz-1.3

MHz HP

652A

Test

Oscillator A

Frequency Accuracy: ±

3%

Output

Amplitude:

3 Vrms

Output

Impedance:

50

ohms

Frequency

Counter

Frequency Range:

100

kHz--18.5 GHz HP

5245L

Frequency

A,T

Accuracy: ±0.001%

Counter

w/

HP

5257A

Sensitivity:

100

mVrms

Transfer

Oscillator

Readout

Digits: 7 digits

*Use:

P""

PERFORMANCE;

A""

AD,JUSTMENT;

T"'

TROUBLESHOOTING

1-9

General

Information

Model8555A

Table 1-4. Test

Equipment

Required (cont'd)

Item

Minimum Specifications Suggested Model *Use

Tunable

RF

Bandwidth:

1kHz

HP

8405A

Vector

T

Voltmeter

Frequency

Range:

1-1000

MHz

Voltmeter

Sensitivity:

10

mV-1

Vrms

Input

Impedance:

;;,

0.1 megohms

Digital

Voltmeter

Voltage

Accuracy:

±0.2%

HP

3440A

Digital Volt-

A,T

Range Selection:

manual

or

automatic

meter

w/

HP

3443A

Voltage Range:

1-1000Vdcfullscale

Plug-in

Input

Impedance:

10

megohms

Polarity:

Automatic

indication

Oscilloscope

Frequency

Range: De

to

50 MHz HP

180A

with

HP

1801A

A,T

Time Base: 1

usjdiv

to

10

ms/div Vertical Amplifier

and

Time Base

Accuracy:

±3% HP

1821A

Horizontal

Dual Channel,

Alternate

Operation

Amplifier

Ac

or

de

Coupling

HP

1000410:1

Divider

External

Sweep

Mode

Probes (2)

Voltage

Accuracy:

±3%

Sensitivity:

0.005

V/div

Power

Meter

Frequency

Range:

0.01-18.0

GHz HP

432A

Power

Meter

A,T

Accuracy:

±1%

with

HP

8478B

Power Range: -20

to

+10

dBm

Thermistor

Mount

Power

Supply

Output

Voltage: Variable, 0··-30 Vdc HP

6205B

Power

Supply

T

Dual DC

Output

Current:

0-300

mA

Meter Accuracy: 3%

DC

Volt-Ohm-

Voltmeter

HP

412A

Volt-Ohm-

A,T

Ammeter

Voltage Range: 1 mV··-300V

Ammeter

Accuracy: ±1%

Input

Resistance: 10 megohms

Ammeter

Current

Range: 1

!1A-1A

Accuracy: ±2%

Ohmmeter

Resistancerange: 1

ohm-100

megohm

Accuracy: ±

5%

reading

at

center

scale

Table 1-5 Test Accessories

..

Item

Required

Features

Suggested Model

Service

Kit

Contents:

HP

08555-60077

140/141

Display

Section

to

Spectrum

Analyzer Plug-in

Extender

Cable Assembly (HP

11592-60015)

IF

to

RF

Unit

Interconnection

Extender

Cable Assembly

(HP

11592-60016)

Selectro Female

to

BNC Male Test Cable, 36 inches long

(HP

11592-60001)

Selectro Male

to

Selectro

Female

Test

Cable, 8 inches long

yellow (HP

11592-60003)

1-10

Model8555A

Item

Service Kit

General

Information

Table 1-5.

Test

Accessories

(cont'd)

Required

Features

Selectro

Female

to

Selectro

Female

Cable,

8"

long,

red

(HP

11592-60002)

Extender

Board Assy, 15 pins,

30

conductors,

for plug-in circuit

boards

(HP

11592-60011)

Extender

Board Assy,

10pins,

20

conductors,

for plug-in circuit

boards

(HP

5060-0256)

Extender

Board Assy,

12

pins,

24

conductors,

for plug-in circuit

boards

(HP

5060-0257)

Extender

Board Assy, 24 pins,

48

conductors,

for plug-in circuit

boards

(HP

5060-0258)

Cable Assy, R & P Female

to

BNC Male (HP

11592-60013)

Cable Assy, SMA Male

to

BNC Male (HP

08555-60076)

Wrench, box-end

slotted

3/16-inch

(HP

08555-20097)

Selectro Jack-to-Jack

Adapter

(HP

1250-0827)

Wrench, open-end, 15/64-inch (HP

8710-0946)

OSM Plug-to-Plug

Adapter

(HP

1250-1158)

1250~

v

11592-60015

Model

HP Ser-

vice Kit

08555-

60077

08555-20097

5060-0256

5060-0258

5060-0257

11592-60013

11592-60001

11592-60011

Figure 1-6. HP 08555-60077 Service

Kit

Required for

Adjustment

& Service Procedures

1-11

General

Information

Model8555A

Table

1-5.

Test Accessories (cont'd)

Item

Required

Features

Suggested Model Use*

10

dB Fixed Frequency Range:

Dc-12.4

GHz HP

8491A,

Option

10

A

Attenuator

Flatness: ±0.2 dB

12

dB Variable Frequency Range:

De-l

GHz HP 355C A

Attenuator

Flatness: ±0.3 dB

VHF

Attenuator

Frequency Range:

De-l

GHz HP 355D A

0-60

dB in

10

dB steps

50-ohm Frequency Range:

Dc-18

GHz HP

909A

Coaxial

P,A

Termination

VSWR:l:l

Termination,

Option

012

Power

Rating:

0.5

Watts

Connector:

Type

N Male

Dual Direc- Frequency Range: 100

MHz-2

GHz HP 778D

Dual

Directional

P,A

tiona! Coupler Directivity: 32 dB Coupler

Directional Frequency Range:

1.7-12.4

GHz HP

779D

Directional p

Coupler (2) Directivity: 26 dB Coupler

Coaxial

Short

Type

N Male Shorting Plug HP

11512A

p

Low Pass

Filter

Cut-off

Frequency:

2.2 GHz HP 360C

Low

Pass

Filter

p

Insertion Loss:<;; 1 dB below

0.9

times

cut-off

frequency

Rejection:;;;, 50 dB

at

1.25

times

cut-off

freq.

BNC

Tee

Two

BNC Female Connectors,

one

Male BNC UG-274A/U T

Connector

HP

1250-0781

Adapter

SMA

Jack

to

BNC

Plug

HP

1250-0831

A

Adapter BNC Jack

to

BNC

Jack

UG-914A/U A

HP

1250-0080

Adapter

BNC

Male

to

Type N Female UG-349A/U

A,T

HP

1250-0077

Adapter (2) BNC Female

to

Type

N Male UG-201A/U P,A.T

HP

1250-0067

Crystal Frequency Range:

0.01-12.4

GHz HP

423A

p

Detector

Frequency Response: ±0.5 dB

Logic Level Compatibility: DTL or TTL, HP

10528A

Logic Clip T

Indicator

Power Requirements: 5 volts ±10% across

any

two

pins

Voltage Probe Dual Banana Plug-to-Probe Tip

and

Clip HP

10025A

Straight-

A,T

(Ground) Lead through Voltage Probe

Cable Assy (2) Male

BNC

Connectors, 48 inches

long

HP

10503A

P,A,T

Cable Assy

BNC

Male

to

Dual Banana Plug,

45

inches long HP

11001A

p

*USE;

A=

ADJUSTMENT;

P

=PERFORMANCE;

T

=TROUBLESHOOTING

1-12

Modei8555A

General

Information

Table

1-5.

Test Accessories

(cont'd)

Item

Required

Features

Suggested Model Use*

Cable Assembly

Dual

Banana Plug

to

Clip

Lead

and

Probe,

HP

11003A

A

60

inches long

Cable Assembly Male

Type

N Connectors, 72 inches long

HP

11500A

A

Tuning

Tool,

Nonmetallic

Shaft,

6 inches long General

Cement

5003

A,T

Blade (HP

8730-0013)

Tuning Tool, Nonmetallic, 6-inch

shaft

Gowanda

PC9668

A,T

Slot

Wrench Open-end,

15/64-inch

HP

8710-0946

A,T

Wrench

Open-end,

5/16cinch

HP

8720-0030

A,T

Wrench

No.6,

Allen Driver HP

5020-0289

A,T

Wrench No.

10,

Allen Driver

HP

5020-0291

A,T

Wrench

Nut

Driver, 5/16-inch

HP

8720-0003

A,T

Screwdrivers Phillips No. 1

A,T

Phillips No. 2

A,T

Pozidriv

No.1

(Small)

Stanley

No.

5531

HP

8710-0899

A,T

Pozidriv No. 2 (Medium)

Stanley

No.

5332

HP

8710-0900

A,T

Tuning

Tool,

Nonmetallic, 2.5-inch

shaft

HP

8710-0095

A,T

Slot

Cover Assy Modified display section cover (seeParagraph Modified HP

5060-07

40

A,T

3-40)

Soldering

Iron

47-1/2

watt

Ungar No.

776

with

A,T

No.

403

7 Heating

Unit

Dummy

Load

Resistance:

83

ohms,

5%

Wattage:

20

watts

(100

ohm

HP 0819-0019

and

500

ohm

HP

0819-0019

T

HP

0819-0035

in parallel)

HP

0819-003

5

Voltage Divider Resistance:

22.97K

1%

1/4W

21.5K

(HP 0757-0199) in series

with

HP

0757-0199

A

1.47K

(HP

0757-1094)

HP

0757-1094

Variable Resistance:

2.5K

ohms variable

HP

2100-2729

A

Resistor

Tuning

tool

kit, Modified 5/16-inch

nut

driver (HP

08555-

HP

08555-20122

A

slug

20122)

with

modified

number

10

Allen

HP

08555-20121

driver (HP

08555-20121)

«USE:

A=

ADJUSTMENT:

P""

PERFORMANCE~

T

=TROUBLESHOOTING

1-13/1-14

Model8555A

Installation

SECTION

II

INSTAllATION

2-1. INITIAL INSPECTION

2-2. Mechanical Check

2-3. Check

the

shipping

carton

for

evidence

of

damage

immediately

after

receipt.

If

there

is

any

visible damage

to

the

carton,

request

the

carrier's

agent be

present

when

the

instrument

is

unpacked.

Inspect

the

instrument

for

physical damage such as

bent

or

broken

parts

and

dents

or

scratches.

If

damage is

found

refer

to

paragraph 2-6

for

recom-

mended

elaim

procedures.

If

the

instrument

appears

to

be

undamaged,

perform

the

electrical

check (see paragraph 2-4).

The

packaging material

should be

retained

for

possible

future

use.

2-4. Electrical Check

2-5.

The

electrical

check

consists

of

following

the

performance

test

procedures

listed in Section IV.

These procedures allow

the

operator

to

determine

that

the

instrument

is,

or

is

not,

operating

within

the

specificaions listed in Table 1-1.

The

initial per-

formance

and

accuracy

of

the

instrument

are certi-

fied as

stated

on

the

inside

front

cover

of

this

manual.

If

the

instrument

does

not

operate

as

specified, refer

to

paragraph

2-6 for

the

recom-

mended

claim

procedure.

2-6. CLAIMS

FOR

DAMAGE

2-7. If physical damage is

found

when

the

instru-

ment

is

unpacked,

notify

the

carrier

and

the

near-

est Hewlett-Packard Sales/Service office immedi-

ately.

The

Sales/Service office will arrange

for

repair

or

replacement

without

waiting

for

a claim

to

be

settled

with

the

carrier.

2-8.

The

warranty

statement

for

the

instrument

is

on

the

inside

front

cover

of

this manual.

Contact

the

nearest Sales/Service office

for

information

about

warranty

claims.

2-9.

PREPARATION

FOR

USE

~~~:~~§]

Before applying power,

check

the

rear

panel slide switch

on

the

Display

Section

for

proper

posi-

tion

(115

or

230

volts).

2-10. Shipping

Configuration

2-11.

Because

of

individual

customer

require-

ments,

shipping

configurations

are flexible.

Preparation

for

use is based

on

the

premise

that

the

RF

and

IF

Sections are installed in a Display

Section

to

make

the

Spectrum

Analyzer

physically

and

functionally

complete

for

use. Since

the

RF

and

IF

Sections

are usually received

separately,

the

plug-ins

must

be

mechanically

fitted

together,

elec-

trically

connected,

and

inserted in a

display

section

or

oscilloscope mainframe

of

the

140-series.

For

mechanical

and

electrical

connections,

refer

to

Figure 2-1

and

paragraph 2-20.

2-12.

Power

Requirements

2-13.

The

Spectrum

Analyzer can

be

operated

from

a 50-

to

60-hertz

input

line

that

supplies

either

a

115-volt

or

230-volt (±10% in

each

case)

power.

Consumed

power

varies

with

the

plug-ins

used

but

is

normally less

than

225

watts.

Line

power

enters

the

Display

Section

or

Mainframe,

where

it

is converted

to

de

voltages,

and

then

is

distributed

to

the

RF

and

IF

Sections

via

internal

connectors.

2-14.

The

115/230

power

selector

switch

at

the

rear

of

Display Section

must

be

set

to

agree

with

the

available line voltage. If

the

line

voltage

is

115

volts,

the

slide switch

must

be

positioned

so

that

115

is

clearly visible.

The

instrument

is

internally

fused

for

115-volt

operation,

when

shipped.

If

230-volt

source

is

to

be used,

refer

to

fuse replace-

ment

procedures

in

the

display

section

manuaL

2-15.

Power

Cable

2-16.

To

protect

operating

personnel,

the

National

Electrical Manufacturers Association

(NEMA)

and

the

International

Electrotechnical

Commission

(IEC)

recommends

that

the

instrument

panel

and

cabinet

be

grounded.

The

Spectrum

Analyzer

is

equipped

with

a

three-conductor

power

cable;

the

third

conductor

is

the

ground

conductor

and

when

the

cable is plugged

into

an

appropriate

receptacle,

the

instrument

is

grounded.

To

preserve

the

protec-

tion

feature

when

operating

the

instrument

from

a

two-contact

outlet,

use a

three-prong

to

two-prong

adapter

and

connect

the

green lead

on

the

adapter

to

ground.

2-17.

Operating

Environment

2-18.

The

Spectrum

Analyzer uses a forced-air

cooling

system

to

maintain

required

operating

tem-

peratures

within the

instrument.

The

air

intake

and

filter

are

located

on

the

rear

of

the

Display Sec-

2-1

Installation

tion; air

is

exhausted

through

the

side panel per-

forations. When

operating

the

instrument,

choose

a

location which provides

at

least

three

inches

of

clearance

around

the

rear

and

both

sides. Refer

to

the

Display Section

manual

for

maintenance

in-

structions

for

the

cooling

system.

2-19. Interconnections

2-20.

The

RF

and

IF

Sections

are normally

shipped

separately,

the

plug-ins

must

be mechani-

cally

fitted

together,

electrically

connected,

and

then

inserted in

the

Display

Section

or

mainframe.

To

make

these

connections,

refer

to

Figure 2-1 and

proceed

as follows:

a.

Set

the

IF

Section

on

a level

bench.

Lo-

cate

slot

near right rear

corner

of

RF

Section;

also,

locate

metal

tab

on

IF

Section

that

engages with

this slot.

b. Grasp

the

8555A

RF

Section

near middle

of

chassis

and

raise

until

it

is a

few

inches above

the

IF

Section.

c. Tilt

RF

Section

until

front

of

assembly

is

about

2 inches higher

than

the

rear.

d. Engage assemblies in

such

a way

that

metal

tab

on

the

rear

of

the

IF

Section

slips

through

the

slot

on

RF

Section.

e. With

the

preceding

mechanical interface

completed,

gently

lower

RF

Section

until electrical

plug

and

receptacle meet.

f.

Position

RF

Section

as

required

to

mate

the

plug

and

receptacle. When plug

and

receptacle

are

properly

aligned,

only

a small

downward

pres-

sure is required

to

obtain

a

snug

fit.

g.

Position

the

latch

on

each side

of

the

RF

Section

to

lock

the

RF

and

IF

Sections

together.

h. Remove

the

50-ohm

lead assembly AT4

(shipped

taped

to

top

of

the

RF

Section)

and

in-

stall

at

the

AUXILIARY

"A"

connector

on

the

rear panel

of

the

Display

Section.

On

Display Sec-

tions

not

equipped

with

an

AUXILIARY

"A"

con-

nector,

install

50-ohm

load

assembly

AT4

at

AUXILIARY

"A"

connector

on

rear

of

RF

Sec-

tion.

1.

Pick

up

the

RF

/IF

Sections

and

center

in

opening

of

Display

Section.

Push forward until

assembly fits snugly

into

Display Section main-

frame.

j.

Push in

front

latch

to

securely fasten

assembly in place.

2-2

Model8555A

2-21.

To

separate

the

RF

/IF

Sections

from

Dis-

play

Section

and

to

separate

the

RF

Section

from

the

IF

Section,

proceed

as follows:

a. Push

front

panel

latch

in

direction

of

arrow

until

it

releases.

b.

Firmly

grasp

the

middle

of

latch

flange

and

pull

RF

/IF

Sections

straight

out.

c. Unlock

the

latch

on

each side

of

the

RF

section

and

exert

an

upward

pulling

force

on

front

edge

of

RF

Section.

d.

When

the

two

sections

separate

at

the

front,

raise

RF

Section

two

or

three

inches

and

slide

metal

tab

at

rear

of

IF

Section

out

of

the

slot

with

which

it

is

engaged.

2-22.

Three

HP

11593A

50-ohm

Terminations

are

supplied

with

each HP 8555A.

They

should

be

connected

to

the

unused

EXT

MIXER,

FIRST

LO

OUTPUT,

and

SECOND LO

OUTPUT

connectors

on

the

front

panel.

2-23. STORAGE

AND

SHIPMENT

2-24. Original Packaging

2-25.

The

same

containers

and

materials

used

in

factory

packaging

can

be

obtained

through

the

Hewlett-Packard

Sales/Service offices listed

at

the

rear

of

this

manual.

2-26.

If

the

instrument

is being

returned

to

Hewlett-Packard

for

servicing,

attach

a

tag

indi-

cating

service

required,

return

address,

instrument

model

number

and

full serial

number.

Mark

the

container

FRAGILE

to

assure careful

handling.

2-27.

In

any

correspondence

refer

to

the

instru-

ment

by

model

number

and

full serial

number.

2-28. Other Packaging Materials

2-29.

The

following general

instructions

should

be

followed when repackaging

with

commercially

available materials:

a. Wrap

the

instrument

in heavy

paper

or

plastic.

(If

shipping

to

a Hewlett-Packard Service

office

or

center

attach

a

tag

indicating

the

type

of

service

required,

return

address, model

number

and

full

serial

number.)

b. Use a

strong

shipping

container.

A

double-wall

carton

made

of

350

pound

test

material

is

adequate.

HP 8555A Service manual

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