HP 8444A Bedienungsanleitung

HALt

Hl[ll

OfPNARO J

MANUAL

CHANGES

MANUAl IDENTIFICATION_.

Model

Number:

Date

Printed:

Part

Number:

8444A

Jan 1972.

08444-90005

This supplement contains important information for correcting manual errors and for adapting the manual

instruments containing improvements made after the printing of the manuaL

use this supplement:

Make

all ERRATA corrections

Make

all

appropriate serial number related changes indicated in the tables below.

..----Serial

Prefix

Number_,--

Make

Manual

Changes-

Serial

Prefix

Number--

Make

Manual

Changes-

1208A 1

1215A .. 1,2

1323A 1,2,3

~NEW

ITEM

ERRATA

Page

8-19, Figure 8-17:

Change wire 92 to 934.

CHANGE

Pages

6-3

through 6-5, Tal)le 6-2, change

read

follows:

A2R29 0757-0465 R:FXD

MET

FLM

lOOK

OHM

1/8W.

A2R36 0757-0439 R:FXD MET FLM 6.81K

OHM

1/8W.

A4A1C2 0160-3456 C:FXD CER

1000

10%

250

VDCW.

08444-60019 OSCILLATOR ASSY: 1.55

GHz

NOT RECOMMENDED FOR FIELD REPAIR.

A7Cl 0160-3827 C:FXD PORC 1 PF 500

VDCW.

A7C4 0160-2437 C:FXD CER 5000 PF +80-20% 200

VDCW.

A7Rl

0698-7230 R:FXD MET

FLM

562

OHM

1/8W.

0160-0155 C:FXD

0.0033

10%

200

VDCW.

0757-0438 R:FXD

MET

FLM 5.11K

OHM

1%1/8

NOTE

A7C4

item number 30 on Figure 8-19.

Page

8-15, Figure 8-12, Service Sheet 3:

Replace

with

attached figure.

Page

8-21, Figure 8-19:

Replace with attached figure.

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,

the

model

number

and

date

from

the

title

page

the

manual.

25 July 1973

Pages

Printed

U.S.A.

HEWLETT.

PACKARD

Model8444A

08444-90005

CHANGE

1 (cont'd)

Pages 5-3 through 5-6, Paragraph

5-9

and Figure 5-2, change

read as follows:

5-9.

1.55

GHz Oscillator Power

level,

Frequency Check and Adjustment

REFERENCE:

Service

Sheet

DESCRIPTION:

The

1.55

GHz local oscillator

checked

for

power

output

level

and

frequency

tuning

range. Oscillator

frequency

determined

primarily

the

LO cavity,

with

tuning

range

determined

the

drive voltage

from

the

oscillator driver.

The

oscillator

checked

first

for

power

level

and

then

for

frequency

and

tuning

range.

FREQUENCY

COUNTER

POWER

METER

DIGITAL

VOLTMETER

CABLE

ASSEMBLY

1~11

TEST

LEADS

THERMISTOR

MOUNT

Figure 5-2.

1.55

GHz

Power

Level

and

Frequency

Check

and

Adjustment

Test

Setup

EQUIPMENT:

Power

Meter

with

78B

Thermistor

Mount

. . . . . . . . . . . . . . . HP

432A

Frequency

Counter

with

5254C

Plug-in . . . . . . . . . . . . . . . . . . .

HP5245L

Digital

Voltmeter

with

3443A

Plug-in . . . . . . . . . . . . . . . . . . . HP

3440A

Test

Leads (dual

banana

plug

probe

and

alligator clip) . . . . . . HP

11003A

Cable Assy, SMA male

BNC

male.

. . . . . . . . . . . . . . . . . . HP

08555-60076

Cable Assy, male BNC

connectors

. . . . . . . . . . . . . . . . . . . . . . . . HP

10503A

Coaxial

Attenuator,

Option

010..

. . . . . . . . . . . . . . . . . . . . . . . . . HP

8491A

Adapter

BNC barrel (HP

Part

Number

1250-0080)

. . . . . . . . . . . UG

914A/U

Adapter

(BNC

Type

N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UG

201A/U

PROCEDURE:

Perform

Power

Supply

Check

and

Adjustment,

paragraph 5-8.

Apply

power

Tracking

Generator

and

allow 1

hour

for

instrument

warm

and

stabilize.

Disconnect

Cable

Isolator

AT3

(see Figures 8-4

and

8-12).

4. With

test

setup

indicated

in Figure 5-2,

connect

Power

Meter

Isolator

AT3

via

08555-60076

cable,

attenuator

and

914A/U

adapter.

Rotate

TRACK

ADJ

control

throughout

its

tuning

range while

noting

power

level

indicated

Power

Meter.

Minimum

power

output

must

greater

than

+5 dBm.

>+5dBm

Connect

Frequency

Counter

Isolator

AT3

via

08555-60076

cable, UG

914A/U

adapter

and

BNC

BNC cable.

Model8444A

08444-90005

CHANGE

1 (cont'd)

Rotate

TRACK

ADJ

control

fully counterclockwise

and

record

oscillator

frequency.

1,548,000

±500kHz

Rotate

TRACK

ADJ

control

fully clockwise

and

record

oscillator

frequency

1,552,000

±500kHz

10.

Record

frequency

tuning

range

(frequency

recorded

step

9 minus

frequency

recorded

step

8).

4,000

±500kHz.

data

recorded

in steps 8,

and

within

tolerance

adjustment

required.

12.

data

recorded

in steps

not

within

tolerance

proceed

with

step

13.

Connect

Digital

Voltmeter

test

point

A2TP5.

14.

Set

TRACK

ADJ

control

fully clockwise.

Set

"MAX"

TUNE

potentiometer

A2R26

and

"MIN"

TUNE

potentiometer

A2R27

fully

counterclockwise. Measure voltage

A2TP5. Voltage

should

0.1 Vdc.

+0.9

+1.1

Vdc

15.

Measure

and

record

oscillator

frequency.

16.

Adjust

"MAX"

TUNE

potentiometer

A2R26

increase oscillator

frequency

4,000

±50

kHz

above

frequency

recorded

step

15.

Record

oscillator

frequency.

17.

Set

TRACK

ADJ

control

center

tuning

range

recorded

in steps

and

above.

Record

oscillator

frequency.

18.

frequency

recorded

step

not

within

500

kHz

1.550

GHz

adjust

ADJ

tune

oscillator

freuqency

1.550

GHz

±100kHz.

19.

oscillator

frequency

adjusted,

repeat

steps

through

18.

20.

Disconnect

Power

Meter

and

connect

W8 Cable

Isolator

AT3

J2.

21.

Replace

right

side

panel

cover.

CHANGE

Page 1-2, Table 1-1, change Spectral Purity: Harmonic Distortion specification to read:

Harmonic Distortion: Typically 25 dB below

output

level.

Page 4-13, Paragraph 4-20, Harmonic Distortion, change SPECIFICATION

read:

Harmonic Distortion: Typically

dB below

output

level. Nonharmonic (spurious) signals:

>40

dB below

output

level.

Page 4-15, Paragraph 4-20, change to read:

12. Note and record maximum amplitude level

harmonic and spurious signals.

Harmonics Typically

~-25

dBm

Spurious

~-40

dBm

Model8444A

~CHANGE

Page 1-2, Table 1-1:

Change

"Nonharmonic

(Spurious) Signals" under Spectral Purity

>35

dB below

output

level.

Page 4-13, Paragraph 4-20:

Change

"Nonharmonic

(Spurious) Signals" in Specification

read:

dB below

output

leveL

Page 4-15, Paragraph 4-20, Step 12:

Change spurious

,:;::;

-35

dBm.

Page 4-16, Table 4-1:

Change

-40

-35

for paragraph 4-20, Spurious Signal Level.

08444-90005

ASSY

ASt08444-WOlll

A'.\PLIFI[R,\tODIJIAIOR

ASSY

-----------1

-~-~--~~---

C!.~f:_IIOPAM-W~51_

~-~--=-~---=

=--~-

---

I I

Fw6

lo%o,.'o.'-F~_.L;;.J;:.vu~FJ

I I

)"---;<-

I !

Cll I I

·J4dB111

1--'<t'

I A

l'Df

],,

' I D

~~~~"T

___

-----

Oto4d6

~.~

23.7

WIJ

~.v

UZ)Vfl

>-e-7

I ,

1 I

~4~~-~--lOVF

·!OVF

---~-----------_j

L-------------------------

__________

__j

- .I

•JOV

DIODE

4~~

-lo

, 1

r3300pF

~REf

DLOOE

SIGNAl

lOV

-JOV

MIN

TUNE

~";-;,

-,,

~--

-------

··----

-------

...

-----

!CoMP'i.'ini:>-Siii:iii~---

•

----~------

-------

--·

Figure 8-12. First Converter Circuits,

Schematic

Diagram (for

CHANGE

-wv

~ill

2.V5t)--il

;;;:-7:JB~r

17G81'

;s:

;r:

"""

Model8444A

Figure 8-19. A

71.55

GHz Oscillator Assembly, Illustrated

Parts Breakdown (1

(for CHANGE 1)

08444-90005

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