Tektronix 492a, 492b schematic

Section

5

Adjustment

Procedure

Adjustment

f ntroductio

n

Procedure

lf

instrument

the

pafiicular
appropriate

performance
repeating

Allow

temperature

illustrations in

construed as
Adjustment

circuit or steps.

STATIC
COMPANENTS USED

Many
static
immediately

characteristics. Devices
JFETS,
damaged
reliability will
reduced

characteristic,

that
instrument

the

DISCHARGE

semiconductor components,

discharge.

and

by

performance

adjustment

specification.

part

of +20o C

the

being representative

steps thal

apparent. lt

high impedance

parts

have

obseruing

the Performance

of

warm

to

to +30" C before

adjustment

interact

CAN

IN THIS INSTRUMENT.

Damage may

may

operate

been severely

the

is nol within

determine

procedure

After

DAMAGE

usually appears as a degradation

that are

following

the cause, repair
to return

any adjustrnent, verify

for

up

at least

procedure

of

flagged

are

especially

nat

be catastrophic and,

particularly

operational amplifiers

within

accepted

impaired.

specified

the instrument

Check.

one hour,

making

may

specilication

MANY

precautions.

any adjustrnents. Waveform

be

and references

SEMICONDUCTOR

MOS

susceptible

limits

Damage

requirements for

if necessary,

performance

in

an ambient

idealized

tolerances.

types,

therefore, not

are: MOS,

(FET

input

over a

can

a

then use

operation

and should

made

can

be

of

the

stages). The

short

be significantly

to

by

not

to the affected

damaged

semiconductor

CMOS,

period,

but

the

be

by

their

492AlP

& 4gzBlP Service,

1 .

Handle
free
work

wrist

2. All
to eafih

Minimize

3.
until
from

4. Hold

Use containers

5.
material for
containers.
returned
one

Vol. 1 5-1

static-sensitive

surface.

plane

strap.

test equipment,

ready

their circuil
the

with

Work

such

as

The

work

ground.

handling

lor

lC

devices

storage
Tektronix,

to
anti-static

by

use.

boards.

made

Any

static sensitive

packaging

station

conductive

accessories,

Minimize

by

and transportation. Avoid

cornponents

areas should contain a

plane

should be connected

keeping

their body

of conductive

Inc.,

the

the

should be

material.

circuit

or

polyethylene

and soldering

components in

removal

rather

material

part

or assembly

packaged

assemblies

sheeting

tools

installation

and

than the

f

illed with

or

using ordinary

in its

at or

static-free

and

to

their

terminals.

(circuit

ground.

earth

should

original

of

conductive

board) that

original

on a static-

bench cover or

grounding

a

be connected'

containers

semiconductors

plastic

is

to be

container

or

Adjustment

Equipment

Procedu re

Required

Table

5-1 lists
adjustment
listed in

adiustment
for

the

checks. Substitute

some test equipment and test fixtures

procedure.

Table 4-1 in

procedure.

characteristics.

Test

Section

4, Performance

The

characteristics

equipment

equipment

listed

must

in

Table

Check,

specified

meet

are
are

or exceed

recommended

5-1

together

required

minimum

the

for

for

with

the

these

the

those

required

Equipment

Return

Loss Bridge

Attenuator

(3

dB

or

miniature)

Autotransformer

Digital

DC
Adapter
Adapter
Three

female
Adapter
Adapter

Cable
Coaxial

Multimeter

Block

(SMB
(BNC

Extension

to

SMB male)
(BNC
(BNC

(20"),

Tip

Cable

male

female

Cables

to SMB)
female

Plugs

(8")

50 O Tenninator
Screwdriver,
Alignment
Screwdriver, Flat,
Screwdriver,
Alfen

Wrenches

Tuning

Tool

6"

Phillips

(3),

7164"
Service

(Extender

Kit

Test Flxture

male)

to

to SMB

mate)

(SMB

to SMA

to

male)

BNC

with 1/8" Tip

No.

1

3132",5164"

Boards)

"

Table

10 MHz

Capable

Vac

90

pV

10

to

Equlpment Required.

5-1:

Characterlstlcs

to 1 GHz. 50

varying line voltage

of

130 Vac

to

Vdc

350

C)

from

Flecommendation

Wiltron VSWR

Weinchel
No.

015-1053-00

General Radio
TEKTRONIX

Tektronix
Tektronix
Tektronix
Tektronix

Tektronix
Tektronix

Tektronix

Tektronix
Tektronix Part
Tektronix
Tektronix

Tektronix

Bridge

Model

4M,

Variac

DM

5O1A

Part

No.

Part

No.

Part

No. 103.0180-00

Part

No. 175-2902-00

Part

No.

Part

No.

Part

No.

Part

No.
No.

Part

No.

Part

No.

Part

No.

and

Use

Model

OZN50

Tektronix Part

Type

W10MTo

DM

or

5O2A
015-0221-00
103-0098-00

175-2412-00

015-1018-00

175-1178-00

012-0208-00
011-0049-01
003-0675-00
003-0908-00

672-0865-01

a

This

5-2

kit is

psrt

of

the

Servlce

Klt 006-3286-01, llsted in tha

f,tatntenance Seolon.

492AlP

&

492BlP

Service, Vol. 1

P reparatio

n

plepare

To
the

Options

rackmount model for

the

section of this

manual

adjustment,

(Section

8).

Adjustment

refer

to

the

Procedure

Rackrnount

part

of

Remove

1

.

Set the

2.

Loosen
Pull

3.

4. Place
Some circuit boards

gain

to
power

1. Adjust

R6028

This

high-efficiency

kHz. The frequency

66
oscillator components;

procedure.
assembly.

the cabinet

instrument

lour

the

the cover up

instrument

the

access

olf

to some test

before

removing

Low Voltage

and R6061

Parl2

on

screws through

and

or assemblies must

on the

power

adjustment is normally required

therefore, Part

of this step should

follows:

as

face

its

otf.

on the bench

points

the assembly.

front

or

the

or adjustments.

Power

Power

supply

Supply

uses an

1 is

only

panel.

back

reconnect

and

removed

be

Supply

board.

internal
the

required

be

rubber

and

When

oscillator

normal

feet.

power

the

placed

this

only after

adjustment

after repair

cord.

on extenders

is

done, turn

with

a

and

the

frequency

replacing

check

of the

of

Since

the Spectrum

primary

transformer, with
used between
receptacle.

The

ground
suitable transformer.

ground
the

lf
bench,

power
and C6111.

potential
Pan

a.

ground patential

transformer must

through
side

to chassis

input

filter

power

the

Connect
power

the Z-Axis

supply

hazardous

is

disconnected.

A relaxation

exceeds

-

1

Check and

a

input

Analyzer

a turns

power

the

input

the

FL301) .

is

potentials

80

voltage-variable

and set

and

Sweep

WARNING

uses

different

ratio

of

source

have

a three-wire input

and output. Stancor

jumper

A

ground

separated

exisf within

This

is

oscillator

V.

Adiust

the transformerfor 117 Yac. Remove

boards.

high

a

from

1:1

and

should

(emitter

from

due to the

ligltts D55112

Low

transformer

efficiency

cfiassrs or

and a 500

the

Spectrum

also be

of Q2061 and

instrument

the

the supply for

slow

voltages.

in line with

power

ground,

earth

minimum

VA

Analyzer

and output

G1521000
connected

the

and operated

several secands

discharge

(nextto

the

connector
is

between

ground

of capacitars C6101

Spectrum

supply,

rating,

an exampte

C6111)

with

isolation

an

should

power

input

with

the

terminal of

on the

when

Analyzer

the coverover

the

be

a

of

primary

after
the

492AlP

& 492BlP Service,

Vol. 1

5-3

Adjustment

Procedure

Table

Supply

+9V

-5V

-7V

-15

V

+5V

+17 V

+100

V

+300 V

Monitorthe

b.

voltmeter (DVM).
Remove

c.

OUTPUT

to the
Adjust

d.

narrow-bit
this step.

5-2:

+15

R6028 for

Power

the

jack

Supply

point

v

+15

test

Power

V

screwdriver

Supply

the

rear

on

supply adjustment,

V

+15

on the voltmeter.

through

Tolerances.

Tolerance

+8.92

V

lo

-4.96

V

to

-7

-14.84
+4'.73 V

+16.81

+95
+280

on

-€.5

V

to

V

V

V

to +105 V

V

to +310 V

Z-Axis

the

to

to +5.23

to

;

cover

screw

panel

(see

Figure

R6028.

the

screw

+10.1

V

-5.05

V

V

-1

5. 1 6 V
V

+18.6

board

located

5-1A).

R6028

hole

that

V

(Figure

berow

This

is

accessed

was

with

5-18)

the 1

0
provide

will

MHz lF

by

removed

a

access

inserting

part

in

c bt

a

vary

e.

t.

the input voltage

supply
Check

remains

the other

against tolerances listed

g.

Remove
Analyzer

Part 2
a. Remove

section,

the voltage-variable

to the

-

Adiustlng

Power

the

remove

then

P3045.
Plug

b.

suitable_p_oryel

the

c. Use

two on/off

d.

Connect

power

the

LINE

SELECTOR

plastic

a

power

test

a

gource

or

oscilloscope
and sweep rate
of the

output

wavelorm,

from

regulated,

supply

and input

voltages

in Table

power

source.

Power

Supply

Power

the

into

cord

the

(1

15 Vac

SwlTCFl).

insulated

switches

of 10

tuning

(S300)

ps/divto

of the oscillator

vac

90

to 1

82

power

at the test

5-2.

transformer

Supply

module

and

Osclllator

as described

Supply module

power

input

receptacle

or 230

Vac,

tool or equivalent,

to close

probe,

with

TP6053

a deflection

(Figure

U6059,

vac.

check

does not
points

indicated

connect

Frequency

in

cover

depending

to

these

switches

5-1A).

is

approximately

that

the +'t 5 V

exceed 210

the

Spectrum

in

Figure

w.

the Maintenance

and

disconnect

and

connect

on the

insert

(Figure

sensitivity of 5

Note

it

to

position

between the

5-1A).

V/div

the amptitude

10

V.

5-18,

a

of

5-4

Adjust

e.

Reconnect

t.

module

R6061

(Oscillator

P3045,

replace

on the Spectrum

Freq Adj)

Power

the

Analyzer.

492AlP &

waveform

for

a

Supply module

period

492BlP

ps

15

of

cover, and

Service,

(66

kHz).

install

Vol.

the

1

F1013
F1017
F201

3

F1

035

Adjustment Procedure

F1 033

s300

R6028
accessible

(+15

V adJust)

through

R1062

is

screw

hole

TP1
Ground

H6061

03 4

TP1035

TP6053

TP1 044

TP1036

-5V

TP1046+

A. Low-voltage
adjustments

*,u Ur,

1047

17V

Q4058

B.

Z-Axls

and

TP1

048

+100

circuit

power

test

V

board

supply

points.

Power

Statu s

Q4059

test

polnts,

492AlP

& 4928/P

Figure

Servlce,

5-1: Low

Vo

l. 1

voltage

power

supply

adiustments.

5-5

Adjustment

Procedure

Sweep

R1

Accuracy

062

Dot

Positlon

R1052

Flgure

Trace

Rotation

Rl

5-2:

Intensity

R1

021

Z.AXIS

cRT

dlsplay adjustment

2.

Adjust

R1021

R3033

and

Geometry

030

Power

Status

Z-Axis

R1027,

,

on the

Rl 051

BRD

LED

R1030,

High

Astigmatlsm

R1058

Trim

R106s

and

and

High

R1051

Voltage

CRT

R2040

test

Voltage

and

,

board.

Bias

Focus

Vertical

potnt

R1OsB

on the Z-Axis

R3033

Horlzontal
R1055

Gain

locations.

Circuits

Gain

R1066

board; R2040

a.

Switch

POWER

INTENSITY
TIME/DIV
MANUAL

b. Remove

the

Limit R1027,

Bias

CRT

c.

d.

Switch
Velical

VIEW
Adjust

1)

POWER

Display mode

B.

CRT Bias

Using a

voltage

2l rurn

the INTENSITY

screen.
Focus

3)
for

5-3)

4l

set

the

noted in

off and

SCAN

epver

over

on

R2040,

Z-Axis

the

on the

on

and,

follows:

as

voltmeter

of

Q4058

the dot

by

adjusting

the smallest
INTENSITY

part

d,

subpart 1.

preset

following

the

Fully
MNL
Midrange

the Z-Axis

board

High

after

to 2

dB/DlV.

in

the 20 V range,

or

Q4059 on

clockwise

and Sweep

(Figure

Voltage

po_wer-up

lhe

Deactivate

the Z-Axis

untir

R3033

round

dot.

for

a collector

Spectrum

Analyzer

Counterctockwise

5-2)

board

state

boards.

fully

(Figure

Set the

counterclockwise,

5-B)

has

stabilized,

READour,

measure

a

cRT

on

the High

voltage

5.5

board

beam dot

record

and

(see

Voltage

v

higher

controls:

Intensity

lully

clockwise.

change the

vlEW

A,

the collector

Figure

s-18).

appears on

(Figure

board

than

the

and

ari'd

voltage

5-6

492AlP

& 492BlP

ServicE,

Vol.

1

Adlustment Procedure

Flgure

5)

6)

7)

Adjust

e.

Adjustment

5-3:

m odu le.

use
counterclockwise
beam

with

Turn
dot

(Figure
and sharpest

Turn

non-metallic

the

until

just

dot

the

extinguishes

adjustment

the INTENSITY

with

the Focus

for

5-2)

adjustment,

round

a

dot.

the INTENSITY

and again measure

should
less,

repeat

the

CRT

egualor

lhe

cathode

exceed
procedure

and

screwdriver

the

fully

counterclockwise,

clockwise

point

test

to

adjust

CRT beam is

(with

screen

until

a dot is

R3033.

dot; then

refocus

counterclockwise

the

collector voltage

part

set

for

setting

as

in

CRT

follows:

that

current

tocations

cRT Bias,

visible,

then

shaded). lf

will

this

visible:

Adjust

Astigmatism

with R3033

until

the

dot

at

Q4058 or

d, subpan

bias.

Hlgh

on

R2040,

clockwise

no

dot

appears,

be

the

bias setting.

then defocus

Fl105B

for

the

smallest

just

disappears,

Q4059.'Voltage

A.

lf

voltage

the

vottage

until the

the

is-

492AlP

&

492glP

Sarvice,

Vot.

2)

Connect
lug

on the CRT

3)

Switch
2

dB/DlV

4l

Adlglt

TP4028.

at

5)

Switch
board. Turn

1

voltmeter

the

shield.

POWER

and

switch

Intensity

Limit

POWER

POWER

back

Digital

off

and

between

After

on.

Storage

R1027

(Figure

reinstall

on

and

TP4028 (Figure

the instrument

off.

5-2) for a voltage

jumper

the

adjust

INTENSIW

the

5-3)

initializes,

P4036

on the High Vottage

lor normal

and the

activate

reading

ground

V

of 0.9

viewing.

5-7

Adjustment

Procedure

f .

Appfy
controls as

the CAL

follows:

OUT

signal

to the

RF INPUT

and set

Spectrum

lhe

Analyzer

'\

FREQUENCY
FREQUENCY

AUTO

REF LEVEL
MIN RF ATTEN O dB

VERTICAL

NARROW VIDEO
VIEW
TIMSDIV
TRIGGERING FREE RUN

g.

Activate ZERO
approximately
5-2) so

Activate VIEW

h.

positioned
adjust
bottom of the screen.

i.

Change the

Vertical

the
just

visible.

j.

Adjust Delta
characters

visible

iust
setting

INPUT.

RESOLN

A/B

the

trace

at the top then bottom of the screen,

Geometry

REF LEVEL

Display mode

is

after the

photograph purposes.

for

1OO MHZ

SPAN/DIV

DISPLAY

FILTER

SPAN and

mid-screen; then adjust

is

aligned

A

and
R1051

Intensity R1030

slightly

trace

adjust

with

VIEW

(Figure

position

to

of 2 dBlDlV.

higher than the trace. Fleadout

has disappeared. This ratio

10
ON

-20
2

ON
Off
AUTO

REFERENCE

graticule

the

B,

then

5-2) for the

(Figure

Disconnect

MHz

dBm

dB/DIV

LEVEL

Trace Rotation

the

lines.

PEAK/AVERAGE

the

use

as

straightest

the trace within

Adjust

5-2)

INTENSITY

the

so

brightness

CAL

until the trace

R1021

reference

a

lrace

at top and

graticule

the

so the

of

characters

provides

OUT

signal

(Figure

cursor,

line

to

area

trace

readout

the

should be

the

best

from

the

is

with

is

RF

-

Adjust Deflection

3

Respo

C4057, C4061 , C5021,

lection Amplif

Def
C1040, C1030,

492BlP Deflection

When
must be connected
rather than as
ACCESSORIES
manner.

connect

a.

1 ms. Position the

Set the

b.

amplitude
Select

nse

adjusting

shown

the

Function

of

and Ground

ier

C3080, C3060,

Option

to the

in Figura 5-4.

connector

eguipment as shown

test

generator

0 to

+4

Amplifier

C5104,

board.

Amplifier

R1055,

R1055, R1066, R5020,

board.

NOTE

42 instruments,

PEN LIFT

Be sure to

when

using the

trace on

V. Connect a

respectively)

the

bottom

controls for

Gain

and

the output of the

connector

PEN

in Figure

graticule

a 500 Hz

jumper

the ACCESSORIES connector.

on

and Frequency

R1066

at

ground pin

between

on the 492AlP

Function

rear

the

LIFT

connector

5-4. set the

line.

sinewave

pins

and

of

the

t

of the

1

R5030

instrument,

in this

TlMHDlv to

signal,

and 5

the

on

Generator

with

an

(Ext

Video

5-8

4gzLtP &

gzBtP

Servlce,'Vol.

1

justment

Ad

Procedure

c

ooo

oo

Time illark

Ganarator

BNC

Partial
J104

T-Connector

(Rear

Accessory

Panel)

Oscllloscope

Showing

Gonnector

c

MARKER/vIDEo

Input

Spectrum

1 3'\

Analyzer

2 5

i

14

Under

1

Test

I

Jumper

Pln

1 to

Pin

5

Figure

5-4: Test

equipment

Deactivate

c.

produce

d.

fliu9t

492BlP

Disconnect

e.

t.

g.

jurnper

the
Triggering

calibrate

1)

Set

2) Monitor
Multimeter).

3)

{Ojugt

(rP2).

4l

Set the

Reset

the

setup

vert

(Figure

TIMHDIV

for

VIEW

a

stable

Gain,

the 500

between

FREE

to

the cenler

TP2

MANUAL

the

horizontal

MANUAL

adjusting

A

and VIEW

sinewave

R1060

5-6) for

Io MNL.

on

for

a

Hz

signalfrom

pins

1

RUN.

of the

the Sweep

SCAN

POSITION

scAN

the

Deflectlon

B,

and sel TRIGGERING

on

the

spectrum

492Np (Figure

the

full-screen

the MARKER/VIDEO

and

5 of the ACCESSORIES

screen for

control for

0 Vorts

(Figure

board

control

controlto

a

analyzer

display.

as

5-9) with

for

0.0

center the

reading

follows:

V

of +5

Amplifier.

lNT. This

to

display.

5-5) or R1066

input.

c6nnector. Reset

voltmeter

a

reading

on the

CRT beam

v

Tp2.

at

should

for

the

Remove

(Digital

voltmeter

(dot).

492AlP

& 4928/P

Servlce,

Vol.

1

5-9

justment

Ad

Procedu

re

c4057

,

Y

)

I

ltiii'-3133:

ill

Figure

Q4040
Q40 30

Q4020

Q4010

5-5:

Test

polnts

c1030

adjustments

and

c1040

on t'he

R1055 R1065

492AlP

Deflection

Q1070

Ampllfier

Q1090

board.

R5020

5-10

Figure

R5030 c3060

5.6.

4928/P

Deflecilon

Ampllfier

test

Q3080

points

492AlP &

and adiustments.

492BlP

Servlce,

Vol.

1

Adjustment

Procedure

h.

fliu_st_Holz
492BlP

(10th

i.

Set

the

graticule

j

Disconnect
Press

k.
t.

Adjust
C3080
shape

Adjust
c1040 for
character

n.

Check
readout,
and readjust

Only

complete

R1055 for

Gain,

(Figure

graticule

MANUAL

line

<Blue-SHIFT>

c5021

for

(no

c4061

5-6), to

line).

SCAN

and check that

voltmeter

the

RESET

and c4057 tor
4928/P

the

overshoot

or

and C5104

the 492BlP

shape.

the appearance

and

the

letter

as needed

part

when

o

rhe 4g2vp

position

the

control to

voltage

the

and set

(Figure

TIME/D|V

restore

to

492AiP (Figure

the

5-6)

roll-off).

for

the 492AlP

(Figure

of lhe

"X"

for

letter

in

MAX

best

5-o)

vertical

NOTE

adjusting the

(Figure

CRT

beam

position

at Tp2

the

for

the

(Figure

for

the best

"7"

in

GHZ
Frequency

of the

and

4928/P

5-5)

on the right

the

CRT

is now

AUTO.

to

power-up

R1055

or

(dot)

beam

-s.0

settings.

graticute

v

5-5) or c3060

best

vertical

horizontal

readout

5-5)

or C1080

readout

of the FREQUENCY

SPAN/DIV

horizontal

Deflection

readout

Amptifier.

for

the

on

the left

t0,z

v.

and

character

and

readout,

shape,

edge

o. Adjust

R5020, R/O

the readout

1)

For

standard instruments,
below
above

2)

For

Option 43
slightly
slightly

4.

Adjust

R1040,
R1033,

a.

R1050,
R1034,

ltanthe

PULSE

STRETCHER,

the instructions

1)

Adjust
Digital

vefiical

the

2l Adjust

Digital

the horizontal

Gain,

and

characters.

the top

the

graticule

baseline.

line,

(reduced graticule),

above

the top

below the

Digital

R1055,
R1045

Digital

Storage Calibration routine

that are

Output

Storage

Output
Storale

Offset

board

graticule

Offset

board

graticule

graticule

baseline.

Storage

R1060

and

and R1046

and

select

displayed on

R1040

place

to

lines.

R1045

place

to

lines.

R5030, R/O

place

and

Offset, for

the

top two rows

place

the

set

the top two rows

line,and

Calibration

on

on the Vertical

itern

and Output

the risers

and

the

2

the

Output

the

steps of

(DIGITAL

Horizontar

by

CRT.

bottom

place

the

storage

pressing

STORAGE

R1050

Gain

of the

adjustment

R1033

Gain

the

adjustment

the best

placement

of readout

readouts

bottom

storage

slightly

readout

of

readouts

board.

6oard.

<Blue-SHIFT>

CAL).

on the

pattern

the

on

pattern

of

slightly

Fonow

Horizontal

on

Vertical

on

492AlP

&

492BlP

Servlce,

Vol.

1

5-11

Adjustment

Procedure

G)

VIDEO AMPL

PROCESSOR

Figure

Digital

5-7:

storage adjustment

b. Connect CAL

controls as

follows:

Oulpul Galn

B1 033

OUT

signalto

Input

Galn

Rl034

Output Gain

locations.

RF INPUT,

the

gugpgl

R1050

Offset

R1 04S

Output

.-'

s1050

Input Offset

Offset

R1055

and setthe Spectrum

R1046

put

Rl 060

Gain

Analyzer

FREQUENCY 100 MHz
FREQUENCY
RESOLUTION

MIN

ATTEN

RF
VERTICAL DISPLAY
NARROW VIDEO
VIEW A/B

PEAK/AVERAGE

c, Set

d.

e. Set the

the REF

the

bottom

Adjust
board, to

repeatedly

of

Input Offset R1046

match

switching

REF LEVEL

graticule.

f . Adjust Input

match

to

g.

Because the offset
as

the

necessary.

SPAN/DIV

BANDWIDTH

FILTER

LEVEL

so the

signal

graticule.

(Figure

the stored display to

VIEW

B on and

to bring the signal

and

(Figure

to

gain

H1034

Gain

stored display

kHz

2A0
1 MHz
O dB
2

dB/DIV
On
Off
Fully

Counterclockwise

peak

is

about

5-7), on the

non-stored

the
off .

peak

on the

5-7),

non-stored display.

the

adjustments

interact, repeat

one division above the

Vertical

close

Digital

display

the top of

to

Storage

while

the

Vertical Digital Storage board,

steps

c through

f

5-12

4g2AlP

&

4gz}lP

Service,

Vol. 1

h.

Select

these

settings:

Adjustment

Procedure

FREOUENCY
FREQUENCY
RESOLUTION
REF

LEVEL

MIN

RF ATTEN

VERTICAL
NARROW
VIEW

A/B

PEAK/AVERAGE

Adjust

match

signal

k.

f{ust

5-7),

stored

5. Adjust

R1062

When
must
rather
ACCESSORIES

Input

oflset,

the horizontal

at center

Input

Gain, R1060

match

to

signal

Sweep

on the Sweep

adjusting

be connected

than as

Option 42 instruments,

shown in

connector when

manner.

SPAN/DIV

BANDWIDTH

DISPLAY

VIDEO FILTER

R1055

on the

position

screen.

on

horizontal

the

near

the

right

edge of

Timing

board.

to

PEN

the

Figure

LIFT

5-4. Be

600 MHz

100

MHz

Auto

-20

dBm
O dB
1O

dB/DIV
Off
Off
Fully

Countercfockwise

Horizontal

of

the

stored

Horizontal

the
position

ol lhe

the screen.

NOTE

the

output of

connector

sure to

using the PEN

Digitar

signal

to that

Digital
stored

the

rear

at the

ground

L\FT

Storage board,

of the non,stored

Storage

signal

pin

connectar

board

to

that of

Functian

instrument,

of

the

I

of the

in

Generator

this

to

(Figure

non-

thb

a.

Connect

the test

Spectrum Analyzer

FREQ
TIMSDIV
TRIGGERING

b.

Connect

jumper

a

respectively)

c. set

e_ditpt_Sryeep

d.

492BlPr,

the

Time

for

align markers

e.

Check

the

accuracy

center eight

f .

Reset
AUTO
mark
pins
moved in

TlMgDlV

the

RESOLN.

generator

1

and 5 of the ACCESSORIES

part

equipment

controls :

SPAN/DIV

between

on

Mark

1 marker

with

ACCESSORIES

the

Generator

Timing,

R1062

per

graticule

of

the

divisions must

AUTO

to

Return Triggering

from

the Spestrum

d.

as shown in

10 MHz
10

EXT

pins

1

and 5

controls for 10

(see

Figure

division.

lines.)

remaining

not

(Use

exceed x5

FREQ

and

to

Analyzer.

conneclor.

Figure

less

or

ms

(Ext

Video

connector.

ms

for 492NP

5-9

Horizontal

TlMgDlV

%.

SPAN/D|V

FREE

RUN.

Remove

5-8.

Set

the

Select

and Ground

time marks.

and

Position

selections.

Error

to MAX,

Disconnect

jumper

the

Reposition

the trace

following

Figure

5-5

adjustment to

over

the

and activate

the time-

between

if

for

492AlP

& 492glP

Service,

Vo

l.

1

5-13

Adjustment

Procedure

To

MARKER/VIDEO

Time Mark

Generator

I

Trigger

Marker

Out

Out

-\l/

: ­::

Partial
Accessory

Back Panel

To HORIZ/TRf

Showing J104

Connector

g

Connect

Between

G

rtttlG?rt
cltrtlrrtilFrEt-

-n-EtILg

u

J

Pins

t3

mper

1

rarlt

&

Flgure 5-8:

Test

W*P1o2o

Figure

5-9: Sweep

equlpment setup

U

board tlming

adjustment

for

adlustlng sweep

and

test

polnt

tlmlng.

locations.

5-14

492AlP

&

492BlP

$ervice,

Vol,

1

Adjustment Procedure

R3040:

Figure

rP1o3s

{l

e

R4040-

H1031 R1 034

5-10: Frequency

6,

R1063,
R1031, R1032,

R1028, R1
board.
C1013

R1062

Sweep

R1028

R1 032

control system

Adjust

R1065,

032, R3040,

C201 1 on the
on

the Sweep board.

Offset

R1 063

Frequency

R1067,

and

1st LO

Swee

2nd LO

test

Tune

R1065

Sweep

point

Control

R1071

and

R1034

on

F14040

and

Controlled

1st
Sweep

R1067

LO FM

H1071

T F;E,BOArd

Coll

IT

032

Rl

and

on

the 1st LO Driver

on the

oscillator

JJ\

TP1 0s8

I

lfl-'

adjustment

System

the Span

board.

Center

board.

Cotl

I

Sp"n Attenuator

lc"n,",,

Control

I

1st

LO Driver

Board

I

I

I

r-i

locatlons.

Attenuator

Frequency

board.

Frequency

Board

Controf

The

Spectrum Analyzer

frequency

not
error message. lf
routine.

Test

and
a. Select

h.

c.
d. Remove

control

be adjusted

equipment required

Frequency

FREQUENCY
FREQUENCY

TRIGGERING

Connect a shorting
chassis

Adjust

STRETCHER
(OVERALL

directed

BOARD

properly,

Counter.

following

the

ground

Sweep

the

SYSTEM) from

("coNNEcT
AND

procedure

has

a

system.
this

(Figure.S-tO).

Offset

shorting

and select

GROUND"),

However,

which

may cause

occurs,

SPAN/DIV 5 MHz

bypass the

forthis

Spectrum Analyzer

strap

step arc a

from TP1035,

R1063
straplrom

item 1

the

A

DVM

etc.

in firmware

possible

it is

the microcomputer

step

and

Voltmeter,

settings:

MHz

O.O
FREE

RUN

on the

Monitor

(Figure

(FREOUENCY

menus. Perform

TO

TP1073 with

for

5-10)

TP1035.

Tp1

Press

058 ON THE 1ST

for

calibrating the

that some

return

Time Mark

Span

0.00
<Blue-SHIFT>

LOOPS

the

adjustments

to display

to the

calibration

Attenuator

the

Digital

V.

CAL), then

calibration steps as

LO DBTVER

may

an

Generator,

board, to

Vottmeter.

PULSE

item

0

4gzAlP

&

gzBlP

Service,

Vol,

1

5-15

justment

Ad

Procedu

re

e.

1) tf

Adjust

1)

2)

3)

4\

5)

6)

"cALlBRATtoN

a

displayed, bypass

to

the adjustment and try

problem persists,
System, in

the SPANIDIV accuracy as

Apply

the cAL

MHZ, FREQ

600
display the

fdiust
5-10)

graticule.
rnarkers.

Remove
Mark

Set
FREQUENCY to

Adjustthe
markerldivision

Set the
Time

Tune

for

one

Reset

the

Generator to

FREQ

the

1st

FREQ

Mark

Generator.

srEP cANNoT

the

refer

Maintenance

the

OUT signal ro rhe RF INPUT,

SPAN/DIV

markers.

Swp R1065,

Coil

marker

CAL

LO

per

the

CENTER FREQUENCY

OUT signal

the

SPAN/DIV

about

FM

over

the

SPAN/DIV

perform

step,

tg bring

Troubleshooting

to

section.

tO

division over

and

RF

INPUT.
to 5

10

MHz.

Coil Swp

center eight divisions

to 20

BE

the other

the

follows:

1OO

MHZ,

on the

apply 0.2

MHz,

REF LEVEL

R1071

kHz

and

OOMPLETED"

adjustments

adjustment

ANd

Span

the

center

(Figure

apply 50

in

range.

Frequency

the

set

the

SEt thE

Attenuator

eight divisions

necessary

as

ps

time mafts

to +10

5-10)

of

the display.
ps

message

Control

FREQUENCy

REF

LEVEL

board

to

from

dBm, and

for

1

markers from

is

then return

lf

the

to

tO

(Figure

ot tne

align

the

Time

the

the

7)

Adjust
center

f . Adjust

1)

Disconnect

2l Press <Blue-SHIFT>

Adiust

3)
the

Adjust

7.

R4020,
board.

R1012,

board.

only

Use

003-0675-00,

the 2nd LO
eight

divisions.

Dot Marker

Dot Position R1062

marker

dot

position

the CAL OUT

over

Log Amplifier

R4052,

R1025,

an

R4471,

R1030,

insulated

to

screwdriver

make

Sweep, R1067, for

follows:

as

signal

RESET.

on the

the start spur.

R4081,

R1037,

and

and

NOTE

or tuning

these

adjustments.

from

the

Sweep

R1085

R1060

tool,

markerldivision

one

RF INPUT.

(Figure

board

on the

on the

49?NP

492BlP

such as

Tektronix

over

5-9) to

Amplifier

Log

Arnplifier

Log

Part Number

the

position

5-16

Preliminary

a.

setup:

4gZAlP

& AgzBtP

Service, Vol. 1

Adjustment Procedure

1)

lpttle
SHIFT>

selecting
(sET

2)

Remove
(Figure

3)

Switch POWER

4)

Remove
instrument;

5) Replace
connect

b.

removed in
5-13.)

c.

Set the

FREQUENCY

FREQUENCY

AUTO
REF

MIN RF
VERTICAL
VIEW A/B
TIMSDIV

r_qg-

4ryp,1,lgr_qollegtion

PULSE

item

STRETCHER

(INTERNAL

5

RESULTS TO

Leveler Disable

5-11).

off.

the Log Amplifier

then

the

assembly

the test

equipment

order to access

Spectrum

Analyzer

SPAN/DIV ZMHz

RESOLN

LEVEL

ATTEN

DISPLAY

"UNCALED").

plug

and

remove

in

the

the

as shown

J621 on

controls

factors

(DIAGNOSTIC

MEASUREMENT

P3035

Detector

shield so

instrument

in

zero

ro

by

FUNCTIONSJ

RESULTS),

on the Video Processor

board

assembry from

adjustments

and switch

Figure

5-12.

the Log Amplilier

lollows:

as

2MHz

On

-60

dBm

0dB

10

dB/Dtv

off

10

ms

pressing

<Btue­and

then

item

board

the

are accessible.

POWER

(P621

board,

back

must

See

be

Figure

2

on.

d.

Center
signal
attenuators

Position

e.

control;

the two

generator

the display

then switch

for

front

50

steps.

f.

Adiust

g.

set

the REF LEVEL

attenuation.

h.

Increase

ro 70

4oiqst

5-13)
of change

the f ront

dB.

the Log

so each

panel

Reset
attenuation

the

Gain,

10

on

the

Reset vgrlic_alnosition

vertical

Return

k.

4djgsl
5-13) for

settings

10

POSITION

the step

Input

minimum

while

dB/DlV

and 2

attenuator

Ref

alternately

panel

LOG

controls for

and Alri'PL

a 10 MHz/+6

dB of attenuation.

graticule

at a

REF

the

LOG

-20

to

vertical

through

R4020

increment

dB

reference

LEVEL from

CAL so each
dBm and

position

to a

the

tar 492AlP

of attenuation results

display.

by temporarily removing

control to

align

the

to 0 dB.

Lvl,

n4a71 for 492AtP

amplitude change

switching

the

dB/DlV.

CAL

adjustments.

dBm output.

line with

-60

dBm to

10

dB

step

the

step attenuators

graticule

step

attenuators

line

or R102s

the

baseline to

the bottom

or R1097

betweenthe

10

vERTICAL

Set

the

vertical

the

-110

dBm in

equals

one

for

if

necessary.

in

10

dB increments

tor

49zB/p

in

one major

signal

and

graticule

for 4928/p

dB/DtV

DlSpLAy

anO a OA/OIV

between

Set the

step

PO$|T|ON

decade

division.

0 dB

(Figure

division

setting the

line.

(Figure

492AlP

& 492glP

Servlce,

Vot.

1

5-17

Adjustment

Procedure

Figure

10

MHz

Leveled

Generator,

0 to

5-11 : P3035

Slgnal

-10

dBrn

@"@"@,@"@

0n

the video

BNC

processor

to smb

board.

Adapter

Spectrum Analyzer

To

J621

Vldeo

on Log

Ampl

Board

Under Test

&

5-18

Flgure

10

5'12:

dB

Test

Step

Attenuator

equlpment

setup for

dB

Step Attenuator

adjusting

492AlP

the Log

& 492BlP

Amplifler.

Servlce.

Vol.

1

l.

Fine-tune

1) Activate

the

2

Gain

iog

dBlDlV

as

and

follows:

10

add

of

dB

attenualion.

Adjustment

Procedure

lf

Zt

the
R4020
remove the

gZAlP

10

the

Repeat this

3)
division.

Activate

4)

m. Activate

Amplifier;

signal to
Adjust output

n.

lor a full-screen

5-13)

o.

Switch

to
attenuation.
R1060

p.

lf a large change
parts

q.

Check

for 4928/P

m

through

the

step

10

dB

492AlP

for

10 dB

R1 A37

or

dB/DlV

check

10

dB/DlV

2

dB/DlV

the baseline

align

Log

the

Rel

10 dB/DlV

the

Adjust

accuracy

(five

divisions)

R1025

or

of external

492BlP

br

2 dB/DlV settings.

and

until the

repeat

and

momentarily

and

to

AmPlifier.

R4081

Lvl,

(eight

divisions)

mode

Log Linearity,

(Figure

in

the adjustment

because

o

of

5-13)

10

dB/DlV

of

is

short, adjust

for

4928/P in

the same

attenuation and adiust

for

equal

display

10

dB step

part

remove the

bottom

the

492AlP or

for

five

is

ito

check

graticule

divisions

10

input

R1030

display.

and set

the step attenuators

492AlP

R1085

so the

setting

for

display

was

required

is mid-screen.

interaction.

2 dB/DlV display

and

gain

the

slightly

direction;

R4071

amplitude

t1

logging.

dB

to

signal

line;

then

for

4928/P

Log

or

part

in

modes as

for

when

minor

the Log

return the

(Figure

for 40

dB of

Fidelity

repeat

o,

follows:

with

then

in

Add

1)
the

Z) Check that

divisions
+0.5

output

Reset

A)

full-screen

for

Add

4,t

'

measure

to

exceed
range.

lf

the

5).

with R4020

Ref
r.
s.

Set
Set

the
the

full-screen

attenuation

2

dB/DlV

rnode.

each

(10

dB

minor

division

to establish

the step

attenuator

disPlaY.

of step

80 dB

the

worst

*1.5 dB

10 dB

step

for

R4071

Lvl,

attenuators

step

Ref

Levelto

display

in the

10

in

10

steps),

steps

dB

dB/DlV

and

(1

steps).

dB

new

a

reference

attenuation

case

2

the

492A

10

to

dBm
2

dB/DlV

first 80

dB/Dlv

or

over the

in

492AlP

for

-15

10

lor

display

each

step is

2 dB/DlV

You may

level

and adjust the

0 dB

to

for 10

dB/DlV,

over the dynamic

error

of

dB

mode

R1037

activate

and

for

the signal

R1025

lP or

dB
and adjust

mode.

1

dB/DlV

mode

1 majordivision,

display step

the signal

adjust

after each

generator

16

and

and

step.

dB

steps

dB

t0.25 minor

is

0.5
generator

output

tor 2

dB/DlV,

range. Error

range,or

+1.0

dB over the

is out of tolerance, adiust

4928/P

4928/P.

for

2

dB/DlV.

readjust the

and

generator

output

for

division,

level

not

must

16 dB

gain

Input

for a

492AlP

&

492BlP

Serviee,

Vol.

1

".5-19

Adjustmenl

Procedu

re

Log Galn

R4020

I-t

l-r

A. 492AlP

Un. Bel.

F4052 Level R4071

Log & Video

lnput Ref.

Amptifier

Board.

Log

Unearity

R1085

P1105

(J620)

P2105

(J621)

Output

Level

Ref.

R4081

Lln.

81012

T

T

Bal.

Log

Gain

R1025

B.492BlP

Output

Ref.

Level Rl030

Log

& Video

Input

Ret

Level

R1037

Amplifler

Board.

Log Fidelity

R1

060

5-20

Figure

5-13: Log

and Video

Amplifler

test

point

and adjustment

492AtP

&

492BlP

locailons.

Service,

'Vol.

1

Adiustment Procedure

From

3rd

Converter

(A)

10

MHz

@-25

(B)

Figure

dBm

5-14:

Test

equlpment setup

t.

U.

V.

J683

Press

LIN and

492BlP

and
Check

and

+4.4

(Figure

10

dB/DlV display

LIN display linearity

note

divisions.

Remove

jack

and

order to

install

VR 2nd

Filter

for

adjustlng

adjust

Lin
for a full-screen

5-13)

should now be

the display

the signal

step

generator

replace P621,

lhe circuit

Select

Varlable

the

Mode

Balance,

display.

the same.

by adding

down

6 dB,

from full

screen

signal connection to the

and

repeat

part

a

board.

Resolutlon module.

R4052

12

tlg2AlP

for

Amplitude

dB, and

to,

18

410.4,

or

of LlN, 2

dB of attenuation

+0.4,

6

Log Amplifier

subparts 2 through 5

R1012tor

dBlDlV,

andT

input

reverse

in

Adjust

8.

492AlP
R3015, R3029,
C1026, C1033, C2037,

VR 1st

492BlP
R3029, R3033,

Resolution

adjustments

R3033,

Filter

Select.

adiustments

R4025

and

-

C1022,

and

C3023, C3035, C3050,

-

C5055,

on the

C1034, C1044, C1046, C2030,

1st

VR

The
wider

Before
correction
selecting

The 1A0 kHz
applied through
filter
to compensate
each

Filter

Select.

3 dB down bandwidth of each

the 6 dB down

than

calibrating the

factors

item

5; then item 2.

filters

both

shape and

bandwidth.

for

filter in

small

to

in

another

increments.

point

Variable Resolution Bandwidth

zero

each

the

pressing

by

section are

first

and

Because of

filter

Bandwidth and

C2026,

R4025

on the

C5048,

VR 2nd

C3030,

filter

of the combined two

<Blue-SHIFT>

C5055, C5048,
VR

Znd

R2025,

C3041 , R1065,
Filter

Select board.

C3039,

section

C3045,

should

NOTE

second

is

that

aligned

out

separately;

sections.

interaction, it

of

adjustment;

Shape

Factor

C3041,

Filter

Select board

R3035

and

R3015,

R1027

and

wide

be as

filter

sections.

or slightly

and Gain, set the

PULSE

The final

is

STRETCHER

a signal

then

adjustments

to

easy

offset

therefore, only adiust

R1065,

on the

the

on

and

is

trim
filter

one

492AtP

492BlP Service,

&

Vol.

1

5-2I

Adjustment

Procedu re

a.

Equipment

1)

setup

Remove

the

is

shown

Variable

Resolution

in Figure

5-144.

module

and

install

it

on

an

extender.

2) Remove
section of the rnodule).

3)

Using smb

(output

4)

Using SMB male-to-male

(10

of

MHz

to second

5) Apply

the

Analyzer
FREQUENCY

FREQUENCY
RESOLUTION
REF LEVEL
MIN

RF ATTEN

VERTICAL

b. Reset
c.

d. Disconnect

the REF

Adjust
(Figure
down,

Third
LEVEL

C5055,

5-15) for

that is

Converter

as

the 10 MHz

needed

the cable

plug

male-to-male

module)

the

output

controls

from

section

cAL

our

the Third
module).

of

signat to

follows:

as

SPAN/DIV

BANDWIDTH

DISPLAY
LEVEL for

C5048, and

the

centered

100

best

around mid-screen).

Third

output

to J693

to maintain

connected

adapters

to

J621, the
adapters

to

and

and

Converter, with red

RF |NPUT,

the

100

MHz

kHz

50
100 kHz

-20

dBm
O dB
2

dB/DIV

a

seven division

C3041

on the

kHz

filter response

Converter

(Figure

5-148).

a 7-division

(input

J683

coaxial

input

cables,

to the

coaxial

and

(100

kHz

(300

kHz

excursion.

VR

2nd Filter

(100

Refer

to

signal from

Set the

display.

to the

connect

Log Amptif

cables,

connecl

band)

set

the spectrum

tor

Oprion

for

Oprion

Select

kHz

bandwidth,

Figure

J683

S-16.

and connect

REFERENCE

second

JOB2

ier.

P6gg

to

J683

07)

07)

board

(input

dB

O

the

Adjust

e.

C3030
screen

f

Sfeps

proceed

t.

through i

to

Change
BANDWIDTH
amplitude

g.

{djust

h.

Change

the

(FL36)
is

centered

BANDWIDTFI

amplitude

i.

Adjust
5-18)

C1034,

for

mid-screen).

c3023,

for

(Figure

part

the

c3035,

4928lP)

5-17).

anly

apply to

j.

FREQ

SPAN/DIV

tor

to 3 MHz. Reset

lo about 7

four

tuning

for

the

best

3

about mid-screen.

FREQ

the

SPAN/DIV

to 1 MHz.

to

about 7

C1044,

the

best

1 MHz

c3050

the

on

best

NOTE

4928/P.

the

to 1 MHz

the

divisions.

screws

MHz

divisions.

(capacitors)

filler

response

to

Reset

the

and C1046

filter response

4gzAtp

the

100

kHz response

your

lf

and

REF

LEVEL

on the

(3

MHz

200 kHz

on the

REF

and

LEVEL

VB 1st

(1

MHz 6 dB

(C3045,

instrument

RESOLUTTON

the

to bring

110

1600 kHz,

C3039,

centered

around

is a 4g2Np,

the signal

MHz

Bandpass Filter

6 dB

the RESOLUTTON

to

the

bring

Filter Select

down,

signal

board

centered

and

mid-

down) that

(Figure

about

5-22

4gZAtP & 4gZBtP Servlce, Vol.

1

Y

r

J683

R3o2e

O

R4025

R106s

s6'Jj",

S

Adjustment Procedure

JoB2----->

Figure

5-15:

Adjustments

iSFENEilCE

IARKEi LEI'EL

-1gDBM

tw

s

?3,,,t I tl lt rl ,l ,,rr a a

aa t r

I I tt tr tt

zDBI

VEFT

olsplAY

on the front

15'81

TT'NE

*

t::\

t:

I I

I

I

t

I

20DB

FF

ltttN

of the

CEilfER FNEOUETICY

IAAKEN FBEOUE}ICY

100.000MH2

492BlP Varlable

4 \

I

\

, ,\, ll It tt I i arrf

i. tt,

0-1.8

FREO

nalroE

INT

itt

osc

aP^'{/Dn

sOKHZ

\ -tl

.I

tt tl tt I f I rt I

100KHZ

vtoEo

NL?gF

BE$OLUNOH

SAlilgwtO?H

Hesolutlon

BE'

-14

module.

492AlP

& 492BlP

Service,

Flgure

Vol. 1

5-16: 100 kHz

fllter

centered.

5-23

Adjustment

Procedure

NOTE

Parts

i

?nd

part

to

j.

l.

change rhe
BANDWIDTH

amplitude

k.

{djust

(FL36)
is

centered

l.

change
BANDWIDTH
amplitude

m. Adjust

response

N.

SEt

thE

200 Hz.

Adjust

o.
p.

Check
the

100 kHz

be

adjusted

k

only

apply

to the

FREQ

spAN/DtV

to 1 MHz.

to about 7

the thre.e

forthe

best

about

FREQ

the

to 10

to

about

C2a37

for

centered

divisions.

tunlng

MHz filter

3

mid-screen.

SPAN/D|V

kHz.

7

divisions,

492A/P (c2090

about

RESOLUTION

Reset

the REF

R4025
the

(Figure

shape,

5-15)

bandwidth,

f ilter is required,

separately.

492NP.

ro

Reset

screws

your

lf

soo kHz

the REF

(capacitors)

response (1

kHz

2

to

Reser

the

REF

for 492Btp)

the 1 kHz

BANDWIDTH

LEVEL

reference

IO 1OO

for

a 7

for maximum

and centering

1st

the

Figure

5-18

and
shows

instrument

and the

LEVEL

on

and

the

LEVEL

RESoLUTtoN

to

bring

the 110

+200

MHz

RESoLUTtoN

to

for

(Figure

HZ

ANd

division

display.

signat

amptitude.

of

each

Znd Filter

typical respense

is

a 4gZB/p, proceed

the

signal

MHz

Bandpass

kHz,

6

dB

bring

the

signal

the

besr 10

5-17),

FREQ

Select

filter.

SPAN/DIV

lf

adjustment

boarijs

shapes.

down)

kHz

tO

shoufd

Filter

that

of

q.

Level

1)

2)

3)

Table

5.3: Filter

Filter

MHz

MHz

(492BlP

(492BlP

3

1

1 MHz (492AtP

10

kHz

1

kHz

100

Hz

gain

the

Select

of

the

these

FREQUENCY
FREQ

SPAN/DIV
RESOLUTION
REF

LEVEL

VIEW A/B
Activate

reference
4qig{

FREQ

SAVE A

for

all other

allfilters
SPAN/DIV

Gain

Ad

R1027

Onty)

H1065

R3029
R3015

filters

follows:

as

settings:

BANDWIDTH

to store

the

filters.

to the 100

kHz level

as necessary

Leveling

Adfustments.

just

100

MHz
20 kHz
100

kHz

-20

dBm

on

100 kHz

as

maintain

to

Locat ion

Figure
Figure

Figure
Figure
Figure
Figure

(300

kHzlorOption

f ilter

amplitude.

perthe

a suitable

5-15

5-17
5-15
5-15
5-15
5-15

This is

following

tabte.

display.

07)

the

Change

5-24

492AlP

& 492BlP

Service,

Vot.

1

Input

I

Y

J693

@

R2045
(4e2BtP

From

3rd Converter

only)

c1034

046

c1

c1044

Adjustment

H2060

@

10 dB Gain

Procedure

Flgure

@

5-17; Adjustments

Preset

9.
Level

R2038
R3035
Rza23
R2031

czoso 10

on

(R1030

on the

and R2060
0n

rear

the

the

g

i n

for 492B/P)

10

the VR

dB

kHz

of

the

Variable

on the

Steps

Gain

(R2045

#2 Mother

for 492BlP)

board.

Variable

Resolutlon

Resolution

Post

VR Amptifier

board.

on

the

Output
On VR#2

Gain

20

dB

To

module.

Band

and

board.

Gain

Steps

J683

board.

492AlP

&

492BlP

Servlee,

The

Log Amplifier

gqiry

gettings.

MHz

10

screen

Resistor

a.

Vol. 1

signal to the

display

R2025 is

Before
correclion factors
and

selecting

must be calibrated
Amplifier

Log

input

with

the

not

used

adjusling the

to

menu item

calibration can

(J621),

nEF

LEVEL

for

the

Variable

zero

pressing

by

"SET

2

NOTE

before

of the Log Amplifier,

at

492NP

Resolution

RESULTS

adjusting

verified

be

-20

dBm.

and 4928/P

gain

and

<Blue-SHIFT>

TO

UNCALED".

any Variabte Resolutian

by applying a +6

and

checking for

Epectrum Analyzers.

band leveling,

PULSE

dBm,

futt

the

set

STRETCHER

5-25

Adjustment

Procedu

re

Adjust

Flat Top
<0.5
Ripple

al

For

dB

lB

A. Response

Fl.t

of 1 0

BW

t29o/o

Down

kHz

filter.

{.756

=

10 kHz
6 clB

lmg

ta.itf,

BW

BW

to|

B.

Response

*tl

1 MHz
Fl

lter

rt.ntrt

Fl.l

of

100

Fllter

10

kHz

Fllter

100 ktlz

na

kHz

Inf,

f ilter.

Flgure

d

Response

C,

5-18:10 kHz, 100

Test

b.

equipment setup is

controls

FREQ

follows:

as

SPAN/DIV 1 MHz
RESOLUTION
REF

LEVEL

MIN RF ATTEN

VERTICAL

c. set the

Band

ccw.

gain

The

d.

ra':,
p*.;ormed
pedorm

of the

through

on this

following

the

10 kHz
Fllter

|-l.f

of 1

MHz fllter.

kHz, and 1 MHz

shown

in

BANDWIDTH

DISPLAY

1

the

R2031

Gain

Post VR

Variable

stage,

vR

on

Amplifier

Resolution

or

the

signal

steps.

ll|c

fltter response.

Figure

-20

KHz

1OO

dBm

5-14.

Set

O dB
2 dB/DIV

Mother

should be 20

board

stages.

gain

through

ll

#2

dB

any

the Spectrum Analyzer

(Figure

for

maintenance

the

5-15) lully

best signalto-noise

has

been

module is incorrect,

5-26

4gZAtP & Ag2BlP Servlce,

'Vol.

1

rle

vf

signa.l
may
adjustments.

gain

should

be

due

1)

Remove

the

2)

Apply
of

jumper

the

is

che.cked

produce

to improper

a
amplifier.

a

the

cover

connector

10

MHz,-14

b-y

?pptying

full-scre,en
catibration

forthe

VR

to the input

dBm

signal

NOTE

q-gs dBm,

disptay.
of ihe'resoiution

2nd

Filter

of

from

r0

Signat

Select
post

the

a

50 ohm

MHz

Adjustment

signat

loss

thio,ugn

band*idth

board,

VR

signal

to

ne

fiter

and disconnect

Amplitiei

source,

Procedure

J69s.

module
ciit"'ring

.1.11.

lpin

to

This

pin

JJ

3) Adjust

4)

e.

Set

f.

Disconnect

-25
to J693.

amplitude
not

module.)

1)

2)

g.

set the

h.

switch

the

REF

10

dB

Gain R2038

screen
Remove

!!e

Replace

the front

dBm

within

!!lte

R2038

amplitude.

lf.the

step.

display.

the

jymper

front

MIN

LEVEL

Gain

connecrorro

the

panel

P69B

signal,

Set the

should

these limits,

signalamptitude

tor

492Alp

signal

amplitude

panet

NolsE

board

for

signal

from

cover

for

AM,PL

(Figure

from

generator

be

A[4pL

qt:20

(Figure

S-17)

the

between

it

indicates a gi

(R1030

cAL for

off,

decrease

dBrn,

5-17')so

492A/P

the input
plllJjJ

the vR

CAL fr,rlly

signal

is

is

2nd

CCW.

and

a<

gene

freguency

3.5

ani

over

s

divisions,

for

4gzB,tp,)foia

less

than

7

a

the

and

adjust

the

(R1030

to

allfe

Filter

5

division

generator

signal

for

the

Post

inpur

select

adjust

divisions,

signal.

rhe

10

amptirudi

the 4928

VR

Amplilier

p6st

ro

the

board.

the

S-division

proceed

output

dB'cain

to

is

tor

tp)

and replace

VR

Amptirier.

post

vR

Gain

signal

part

to

-85

dBm, leave

R3ffi5;on

ToivGions.

futl

a

g

of this

the

492AlP

& 492Blp

Service,

t.

an{adjust
5-17)

change

t.

q{d

20

k.

set
check
a.nd
signal
necessary.

t.

Remove

Vol.

change

1

the

for

a

the.generatoroutpq!

goiust the 10

dB

Gain

the

REF

tor a 7-divis.ion

dBT input

;Q5

verify

to

the 10

gener?loloytp_ut

the

20

dB

Gain

7-division

dB

step

board

LEVEL

levels.

that

the

MHz

Rz}zg

signal

amplitude.

Gain

R2060_for

(Figure

-90

to

dBm

signal.amptitude.

Note

gain

of

signal

to

-4s

to

to

each

J693

dBm,

on

the

-65

dBm,

s-17)

for

and

that

each

gain

and connect

rhe

REF

ao

dB

Gain

the REF

492!tP (R2045

7-division

a

generator

the

n-epeat

stage

this

detting

maintains

is-10

p698.

Oe.-

LEVEL

step

ooird

LEVEL

toligzB/p)

signat

ampritroe.

output

chrick

ieadiust

to

for-4s,

-40

to

to

ine 7-division

(Figure

-60

-35

dBm,

dBm,

on

dBm.

-5s,

gain

5-27

ine

if

Adjustment

Procedure

m. Press

<Blue-SHIFT>

correction factors.

The

band

level

Tracki7g

mean

10.

R1041

The
used
the

a.

@hen

level for

Adjust

on the

CAL

OUT

verify

to

generatar

signal

Apply

g

through

-20

ol

dBm

10_0 MHz
a 3 dB

adjusting

adiustments

preselector

each

band

CAL

100

OUT

MHz

output level

the output

must

signal

attenuator,

on the

the

CAL

Pow_er

OUT

CAL

rerun

to

performed

are

installed

is

sef

to the

Output Level

Osc

and

3rd

NOTE

is

matched

level

of

the

greater

be

from

the signal

and

sellhe

meter.

output

level.

a calibration

NOTE

after catibrating

a)

and checking

level

of Band

Converter

knawn

to a

reference

than

This

signat

40

dB

generatorto

generator

sets

up

routine

freq-uency

I .

board.

reference.

generator.

from

dowi

the

output level

reference

a

and

establish

preselector

the

response.

power

A

Harmonics

fundamental.

the

power

meter

for

signal

The

meter

is

of

a reading

lor

Disconnect

b.

reference
INPUT.

signal.

c.

Set the

test

FREQUENCY
FREQUENCY
RESOLUTION

REF
MIN RF
VIEW
PEAK/AVERAGE
TIME/DIV

TRIGGERING

d. Press

SAVE

e. Remove

OUlqigry!

the

CAL

OUT

f

.

Adjust

cal
displacement
display)

power

the

(from

signal

Be

sure to

use

spectrum

SPAN/DIV

BANDWIDTH

LEVEL

ATTEN

A/B

A

to

store

reference

the

q

place.

its
signat with

Level R1041

between

rneter from

generator)

the

the

same

analyzer

the signal

to

the

cable that was

controls

100
100

follows:

as

MHz
kHz

1 MHz

-18

dBm
O dB
On
Fully

Counterclockwise
AUTO
AUTO

the

display,

signal from

Tune

the CENTEB

the SAVE A

in

the 3rd converter (Figure

,

the

CAL

RF

the

INPUT

FREQUENCY

disptay.

OUT signal

generator

test spectrum

used

and

to

connect

and connect

analyzer

set thb reference

the

conrrot

s-19) for

no

and the reference

the

RF

CAL

to atign

(SAVE

A

a

sea

5-2I

Section

1,

General

Informatlon,

to determlne

when a

preselector

fitter

is installed.

492AlP

&

492BlP

Service.

Vol. 1

110

MHz

(

FL36)

Fllter Input

justment

Ad

Procedure

lF

110

Gain

MHz

Figure

R1015

lF

Amplitler

5-19:

Calibrator

Level

110 MHz

(J

110

and

Callbrator

lF Input

321

)

MHz lF

In

3rd

gain

adiustment

Level

Converter

Rl041

Spectrum Analyzer

tocailons.

11.

Adjust lF

1

R

015 on the

a.

Connect

b.

Set the test speclrurn

1 1 0 MHz

the

CAL

FREQUENCY
FREQ

SPAN/DIV
RESOLUTION
REF

LEVEL

MIN RF ATTEN

VIEW

A/B

PEAK/AVERAGE

TIMSDIV
TRIGGERING

panel

c. Set the

Gain)
excessive

If

unable

for

excessive

has

a

front

for

5 divisions

to

adjustthe AMP

signal loss in

gain

of

2A

loss

dB when

Gain

Amplif ier

OUT signal

analyzer

BANDWIDTH

AMPL

of signal.

through the front

board.

to the

controls as follows:

lully

CAL

(lf

NOTE

patforfive

CAL

input

the

the AMP

circuitry.

CAL

RF Input

100

MHz

200 kHz

1 MHz

-20

dBm
O dB
On

Fu

lly

Counterclockwise
AUTO
AUTO

CCW

and adiust R1015

this cannot

end.)

divisions

The 1 10

pot

r.s

sef

. dbl

el

(110

be

achieved, it indicates

of signal

MHz lF

for

6 dB of down

amplitude, check

module

MHz lF

typically

range.

4gzAlP

&

492BlP

Service,

Vol.

1

'"'g-zg

Adjustment

Procedure

d. Adiust

should
least

Two

variable
require
measurement

12.

adjustment

Adjust

51015 on

When
where

B-SAVE A
k is

AMPL

the

now
dB above the

6

capacitors, C|054

which is a maintenance

lhe

a constant

about 0.2 minor

graticule
binary
five

To
a. Estimate

line,

switch S1015

divisions;

set

B-SAVE

the

the amount

but
switch

for

CAL

be

able to adjust

full

a

screen

the

signal

Reference

Level.

signal. The

6 dB

NOTE

C2047

and

during calibration.

These

repair

and

on

the

adjustments require

B-SAVE A Reference

Vertical

is selected,

divisions. The

it may

Digital

Storage board.

the expression

the

input

data. Each

set by

reference

positioned

be

(Figure

halt

#7

5-7).

this

amount,

The

A Reference level:

and direction the

level

within

MSB

etc.

reference

implemented

is

the

(switch

AMPL

below

the

1 10

MHz

function.

Level

moves

bit

typically set

graticule

#8)

shifts the display

level

CAL

adjustment

Referenc6

lF

board,

return

(B-SAVE

is

the reference

at lhe center

area by

is

setting

to be shifted.

Level,

do not

loss

A)

+k,

level

8-bit

about

at

b.

Close

or open the

reference

level.

changes, and

13. Adiust

R1031,
R1065,

a. Conned

b. Sel tha

R1045,

and R2066

the test

ottset

adiusting fi

1)

Switch
on

an extender board

2)

Sel rhe

Remove

3)
ground

4)

Starting
5-21) for 0 V

switches on

the most

Use

least

the

significant switches

Preselector

R1049,

R1052, R1054,

on the

S1015 to obtain the

significant settings

Driver"

Preselector

equipment as shown in Figure

for

driver U2054 as

lollows

U2054 is changed):

POWER

FREQUENCY

P3055

(Figure

from

otl and r€move

(Figure

5-21),

RANGE

and connect a DVM

5-21

tully

a

CCW

tho voltmeter range

Set

).

position,

to band 1

at TP4054.

(5

(1

through

R1056, R1061,

driver

board.

5-20.

(otfsel

Preselector

th8

should only require

and switch POWER

(0-1.8

GHz).

between TP4054

to 30

adiust Ddver

desired

through

4) for

R1063,

Driver

board. Insta it

and analog

pV

Ofiset

R2060

B-SAVE

for large

8)

small

changes.

R1064,

on.

or less.

(Figurs

A

a

Sea

5-30

S€ctlon

I, Gln.ral

tntoamltion,

Disconnecl

5)
reinslall

t0 oatatnma who'l !

ths Preselector

the DVM

prcarlactor

replace P3055;

and

Ddver board.

f tcr lr Inrtlth.t.

492AlP

thon switch

Switch POWER

& 492glP Servica, Vot.

POWER

on.

back

otf and

1

justment

Ad

Procedure

Maln

r

o

oo

Digltal

Voltmeter

Frame

Comb

Source

Generator

Spectrum

Analyzer

Preselector

Comb

Modu

Under

Generator

Test

Driver

le

Board

E.E...lnput

P2011

Figure

ffi

@@

ffi@

5-20: Preselector

Analog
Ground

Drlver

adjustment

P3055

TP4054

R 4049

setup.

rPl

azz@r)

TP1069
Preselector)

(Ext,

4g2AlP

&

Figure

492BlP

5-21

: Preselector

Service,

Vol.

1

Drlver

test

point

and

adjustment

locattons.

5-31

Adjustment

Procedure

c. Adjusl

1)

MANUAL

the

Connect

potentiometer

2) lf

necessary,

mark on the

CAL OUT signal

the

follows:

Apply

d.

controls as

center

FREOUENCY
FREQUENCY SPANiDIV

AUTO RESOLN

REFERENCE LEVEL

Adjust the CENTER

e.

f

. Center the

Input

TP1069 with a

screen before

g.

Adjust

Preselector

the

signal; then

h. Peak

figure

2.1 GHz

the

5-21).

PEAK

DVM

a

between

ground,

and

loosen

the

f ront

RANGE 1.7

FREQUENCY

Offset

jumper
installing

adjustment R1031

strap.

the

Offset

remove

grounding

the

with

signal

control

the center

and

knob

and

panel

to

RF INPUT,

the

20
On

-30

Be sure

shorting

R1064 for

R1049

position

as follows:

tap of the

adjust

the control

position

adjust

peaking

its

range indicator.

and set the

-

5.5 GHz

MHz

dBrn

centerthe

to

2.1

(Figure

that the

2.1

GHz marker is

strap.

maximum response

strap.

-829

(the

MHz lF

MANUAL

for

Volts.

0

PEAK

to align

Spectrum

GHz marker.

then

ground

5-21);

of

Offset

adjustment;

it with

Analyzer

at

center

the

2.1

the

GHz

i.

Remove the CAL

Comb Generator

FREQUENCY
REFERENCE LEVEL

i.

Use the

screen,

FREQUENCY control

peak

and

Sense adjustment;

k. Repeat

frequency

l.

Select

steps

points

these settings:

FREQUENCY
FREQUENCY 6
REFERENCE

RESOLUTION BANDWIDTH
m. Adjust
n. Set

the

Peak

MANUAL PEAK

the

FREQUENCY

the signal amplitude

5-211,

o.

Repeat

parts

OUT signal and

RF INPUT

to

the

connect the output

select

and

5.5 GHz
O dBm

to

center

the 5.5 GHz signal amplitude

figure

5-21).

h through j to ensure

track the

input

RANGE

that

tuning.

5,4- 18.0

GHz

As

LEVEL

needed

As needed

peak

observe the

R1052

(the

m

and n

controlto

to 9

GHz and

with

to ensure tracking over

these

the

5.5

the 2.1

GHz

the

X3

Gain adiustment;

this

of the

settings:

GHz comb

with

R1065

GHz and

5.5 GHz

(Band

6 GHz

signal.

9 GHz

mafier on

range.

Microwave

marker

(the

Preselector

4)

ligure

on

screen.

p.

lrrcrease
amplitude

5-32 492AlP

FREQU ENCY

the

with R1054

to

(the

Shaper #1

12

GHz, then

adjustment;

peak

the

1 2

figure

& 492BlP

marker

GHz

5-21).

Servlce,

Vol. 1

q.

Set the FREQUENCY
amplitude with R1056

r.

Recheck
same
repeat

the 6, 9,

position

steps

within

i

through

to the 17

(the

shaper

'12,

and

17

GHz

the MANUAL

q.

GHz

marker,

#2

adjustmenti

points

PEAKING

then

verify

to

control's

Adjustment

peak

figure

that they all

17

the

s-21).

range.

GHz marker

peak

lf

Procedure

near

the

they

do not,

s.

change the
comb marker
MANUAL PEAK

t.

change FREQUENOY
lame

Offset

Repeat

u.

same
Set

V.

MANUAL

MANUAL

W.

Change
to

center

Adjust.€29

X.

FREQUENOY

between

control.

used

ln

signal

adjustment R1031

parts

s

position

and t untilthe

within

PEAK

PEAK

control's

FREQUENOY

the

3.5 GHz

MHz

lF

response.
Select these settings:

Y.

FREQUENCY
FREQUENCY

z.

Observe the 5 GHz marker;
Rl045

(the

+829 MHz lF

RANGE

RANGE

5.4 and 5.5

RANGE

with

step s

(Figure

ro 1.7

GHz;

to

the 5.4 - 18.0

the FREQUENCY

5-21)

signal

MANUAL

the

control

so

PEAKING
index

the

range.

RANGE

to 1 .7

comb marker

Offset R1049

(Figure

5.0 GHz

3.0

peak

then

CIfset adjustment).

-

5.5
peak

then

peak

to

amplitude

peaks

control's range.

mark

-

5.5

GHz

on

the screen.

5-21)

-

7.1

GHz

the

5.0 GHz

(Band

GHz

the

signalwith the

(Band

GHz

control, and

the signal.

(on

both

aligns with

set

and

to

peak

the

the

signal

2).

center

4).

centerthe

Input

adjust

bands)

at the

the center of

FREQUENCY

3.S GHz

amplitude

with

a

the

Select these

FREQUENCY
FREQUENCY

ab.

Obserue
R1064

Tune

(the

lhe

the

t9

amplitude with R1061
Tune

ad.

the

21

with R1063

ae.

Check the 15,

af.

range
change

to

the

of

the

center screen;

adjustment;

ag.

Change

then

ah.

Signals within
index

to the 1.7

peak

the

mafter

settings:

RANGE

15

GHz marker,

Shaper

GHz marker

GHz markerto

(the

MANUAL

FREQUENOY

figure

#2 adjustment; ligure

to

center screen,

(the

shaper

center screen,

Shaper #4

19,

and21

adjustment).

GHz

PEAK

RANGE

peakthe

then

5-21l'.

-5.5

GHz

3.5 GHz
each

nears

signalwith

should now

band

the center

15.0

GHz

-

15

21 GHz

peak

then

the 15

5-21).

then

#3

adjustment; figure

then

points

verify

to

control.

-7.1

to 3.0

signalwith R1045

band. Center

R1049

range.

of its

(the

peak

a 3.5

when

GHz signal

peak

the

peak

the

that

they

all

GHz; tune

(the

+829

marker on screen;

GHz

-829

MHz

the MANUAL

amplitude

19

GHz signal

with

5-21).

signal amplitude

peak

within

the

GHz signal

a 5.0

lF

MHz

f F

adjustment).

knob

PEAK

492AlP

&

492BlP

Service, Vol.

1

5-33

Adjustment

To

Input

Procedure

EXT

ALC

Connector

-

Spectrum

Analyzer

Under Test

II

o oo

Sweep Oscillator

N

to SMA aorpt.r

Figure

r

o

RF

OUT

ol

o

To

HF.

Connector

(

)s

Low

5-222 Test

1 4,

EXT

ALC

o

Attenuator

dB

Loss

equipment setup

Adjust

Coax Cable Wlth SMA

Band

for

band leveling

Leveling for

Connectors

adjustment.

Coaxial Bands

(1

5)

R2031 , R3034, R3030, R3019

The

mean value

reference

Pedorm

a.

the

(average
Perform

b.

Baseline Leveling

c.

Connect

d. Set the

100

at

Frequency Response

Performance

level

adjustment step

test equipment as shown

Spectrum

REFERENCE RANGE
REFERENCE

AUTO RESOLN

BEFERENCE
MIN RF ATTEN
VERTICAL DISPLAY
VIEW

A

and

frequency

of

the

MHz.

Check section and

between two

before

Analyzer

SPAN/DIV

LEVEL

VIEW

B

n3A22

and

on the

NOTE

respanse far

Check

extremes)

g

Presetting

proceeding

controls as lollows:

of bands 1

note

for

the Variable
to the

in

Figure

-

1.7

5.5

MHz

10
On

-20

dBm
O dB
2 dB/DIV
On

Vn

each

band

frequency

the

each

band.

next

5-22.

GHz

Mother

#2

rs

sef

to

through

Resolution

part.

5

as described

the

at

board.

a-20 dBm

level

mean

Gain

and

in

5-34

492AlP

&

492BlP

Service, Vol. 1

Adjustment

Procedure

Flgure

5-23:

Band

Band levellng

Apply

e.

noted

to center

calibrated

a

lorthe mean level

the

J683

(lnput

#10

adjustment

-20

dBm signal,

in

input

signal

and

pail

and

otr

Band

.#2I

I I

galn

diode locatlons.

whose

to the

a,

reduce

the

frequency

RF

INPUT.

FREQ

SPAN/DIV

is

the same as

Set the

FREQUENCY

to 500

that

k{z.

power

lf

a

sensor

I.

g.

meter is

in

line with

Adjust Band
full

screen

Change

the

calibrated

level

in

Band 3 for

h.

set the

FHEQUENCY

SPAN/DIV to 500
i.
j.

Adjust

Repeat

of each

Band

the above

with
insufficient,
adjustment
required range.
Variable
increases

monitor

signal

R3034

display.

to

the

on

the

2

Gain

(-20

used to

dBm)

FREQUENCY RANGE

-20

dBm signal

part

a of

with

this

to center the

kHzlDiv.

3 Gain

R3030

procedure

the

appropriate adiustment.

add or

remove

potentiometer

Refer

Resolution

Mother Boards,

(Figure

for

a diode between

on

the

to

schematic diagram and component

gain.

NOTE

level,

signal

RF INPUT.

VR

the

the

Mother

to 3.0

the

same

procedure.

input

5-23)

each coaxial

VR

Mother

in Volume

connect

board

-7.1

GHz

frequency

signal,

for

lf

a

band

the

pin

full

range

and set the

screen

(1

DD

board

Adding

2.

power

the

(Figure

#2

(Band

noted for

as

meter

5-23)

3) and apply a

FREQ

display.

-

5)

and set

any adiustment

of

the

and

lf2,lo

appropriate

obtain

diode

the

for

mean'

the

gain

the

the

locator

a

is

for

492AlP

&

492BlP

Service, Vo l.

1

5-35

Adjustment

Procedu re

1

5. Adjust
(Bands

Band Leveling

-

11)

6

for

Waveguide

Bands

R3024,

Gain

bands will

a.

b.

R3026, R3028, R3029,

adiustment for

be used.

2073._MHz,

lpe]y

EXT MIXER

Set

the

Spectrum

FREQUENCY
FREQUENCY

AUTO

REFERENCE

The

baseline

applied to the
generatar

c.

frequency

-6_0

With
for

full-screen

a

waveguide

the

-60

input.

Analyzer

RANGE

SPAN/DIV

RESOLN

LEVEL

of_the

spectrum

EXTERNAL

slightly

input level

dBm

display.

dBm

signal

controls

analyzer

MIXER

peak

to

applied,

and R30BZ

NOTE

bands

need

through

as follows:

-

1B

26

200

MHz

On

-30

dBm

NOTE

display will

port

input

the response

connector.

adjust R3024

on

a DC-blocking

the

to be

(Band

GHz

rise when

VR

Mother

adjusted

capacitor

6)

ZA72

Adjust

on

the

spectrum

Band

6

Gain

board

if

only

MHz

the

signat

ahalyzer.

(Figure

#Z

these

to the

signat is

S-Zg)

Table

d.

Change the FREQUENCY
adiustments,

e. Switch POWER

POWER

5-4: External

-

(18

6

7

B

e
1

11

12

(26

(33

(50

(75

0

(110

(170

27

-

4A

-

60 GHz)

-

e0

-

140

-

-

back on.

Mlxer

GHz)

GHz)

GHz)

GHz)

220

GHz)

325 GHz)

RANGE

shown in Table

replace

off;

Band

Variable

Leveling

Gain Adjustment

R3024

R3026

R3029

and

5-4, for

Adjustments

adjust the

full-screen

a

Resolution

appropriate

Band

display.

module;then

switch

Gain

5-36

492AlP

& 492BlP

Servlce,

Vo

l.

1

justment

Ad

Procedure

16. Phase

c1016,
C1013
R1061

The
the
to

determine

section in
a. Prepare

lf

desired,

of

the test

appropriate,

oscilloscape

instruments.

c1018,

C201

and

R3082

and

Phase

assernbly has

1)

2l

3)

Lock

if

this manual.

the

Remove

points

test

Plug

the

Use extender
respective

with

black

the direct reading
oscilloscope

throughout
probe

f-ocf

assembly normally requires

calibration is necessary.

module

the Phase

assembly

Calibration

c1032,

1

been

and adjustments

connectors

band to

and

c1034
on the
on the Error

Controiled

repaired

for

calibration

Lock

onto

cables

J502).

Amptifier

or

module

extender

and

adapters

(cable

on the

Oscillator

replaced.

Refer

as

are

accessible.

with

NOTE

counter may

get

to

will

this

serue

a count

procedure.

as

of a display

common

the

strobe

board.

board.

calibration

Phase

to

the

follows:

and

the

two

boards

to

connect

yellow

be

The

band

connected

ground
ground

Driver

Performance

and then

at each

board.

only after

noise

should

plates

cover

into

signals

to J501,

to the

test

side

of

return

for

the

part

some

be

checked

Check

so

all circuit

instrument.

the

to their

and the cable

Vertical

point,

both

Output

when

test

of

b.

Initial

setup:

1)

Press
routine;
SHIFT>

2l

set the
active

c. Check

repair

or

1)

Co^nnect

5'2FA)

2)

Connect

3)

connect

frequency.

and

the

4',

Connect
lor
and

<Blue-SHIFT>

following

retum

to

REF

LEVEL

(button

Offset Mlxer

replacement

and

lit).

th9 Dirgct

set the

+

the counter
the

counter

Frequency

(for

K

example,

counter

a signalwith

an amplitude

probe

test

a

oscilloscope

a

CAL

and complete

adjustment

instrument

the

to

-

This

of

the

Input

counter

to
lo

25.080

from

frequency
of

approximately S V

of the LOG

-30

dBm

part

ot the

Mixer

board.

frequency

of the

controls for

pin

K

and note

the collector

should equal

MHz

the

collector

probe

of approximately

initial

the

CAL

control,

norrnaloperation

to

and

check that

procedure

a
the

of

e1040

the

-

25.000
of

e1040.

to the

peak-to-peak.

is

counter

count. Note

frequency.

and note the

ditference

=

MHz

collector

80

part

of

this calibration

press

<Blue-

the AUTo

only required

to

between

g0

of Q1040 and check

kHz,

RESoLN is

atter

pin

(Figure

N

frequency.

the

pins

Dibconnect

kHz).

a 50o/o duty cycle,

N

492AlP

&

492glP

Servlce,

Vol.

1

5-37

Adjustment

Procedure

@

CONTROLLED

OSCILLATOR

0

TP201 1

A. Syntheslzer,

OFFSET

Oflset

MIXER

o1040

Mlxer,

and

Controlled

AMPLIFIER

f

o-

'--l

SYNTHES

rP2o40

E

s

TP1

040

Oscillator

IZE

circuit

R

boards.

Flgure

rp

E

B.

5'24.

1os2

Error

Phase

Amplifier

Lock

assembly

Error

STROBE

FL

1 024

and

Strobe

adiustment

Count

P3057

trt

DHIVER

Driver

circuit

and

Point

TP1O12E

boards.

point

test

Rl061

Gain

TP3081

R3082

locations.

5-3I

4gZAtP

& 4gzBlP

Service,

Vot.

1

d.

Check

1)

2)

Synthesizer

Set

the SPAN/DIV

Change
Synthesizer

to 200 kHz. Phase

SPAN/DIV to

board.

Check

500

kHz
for

a

lock

and

connect

reading

Adjustment Procedure

should

of

50.00

the

counter to

MHz.

occur.

J500

on

the

3)

Connect

that

4l

Connect
positive

5)

Change
TP1040

e.

Controlled

replacement

or

Bandpass
they require

the counter

is

near

25.0

the test

pulses

the SPAN/DIV

remains.

Osclllator

of the

filter

adjustments

a special

test

adjustment.
lf

adjustment

board

should be replaced.

of Cl013

1) Press <Blue-SHIFT>
(FREOUENCY

SYNTHESIZER)

2)

Follow

displayed.
C2011,

instructions

the

Due

the

two steps will have

correct. Alternately

the

two voltage readings

TP2040

to

(Figure

MHz.

oscilloscope

with

an amplitude

200

to

-

part

This

TP1040

to

of approxirnately 4 V

kHz

of the check

Controlled Oscillator

NOTE

C|041

fixture.

and C2011 is not

LOOPS

from

to the

press

and C|042

These

adjustments

sufficient

PULSE

STRETCHER

CAL);then

the

displayed menu.

until the message,

interaction

of adjustmenl

to be

AUTO

are

RESOLN

correct,

5-24A) and

(Figure

and

observe

board.

are

item

#5

"VERIFY

repeated

check

5-24A) and

peak-to-peak.

that the signal

only

at the

not

do

setect

required

factory

need further

phase-lock,

item

LOCK

is

set

to achieve

and

(PHASE

LAST

capacitors

until the

and IDENT,

for

reading

a

check

for

on

after

repair

because

the

#1

STEP" is

C1013

voltages

and

are

and adjust until

4gzAlP

& 492BlP

Service,

3)

Connect

(Figure

check

I

Check
SYNTHESIZER"
<BIUE-SHIFT>
routine.

1)

Connect
(Figure

of

about 5 MHz.

2)

Connect
sinusoidalwaveform

lf

3)

the

of

select

amplitude

these

3.3

Vol.

1

the

counter to TP2011

5-24A')

lor

a count

Operatlon

routine

PULSE

Any

step

in

the test

5-248),and

the

test

amplitude

capacitors

and minimum

capacitors,

-

pF

27

pF.

on

either

of

press

and alternately

reading

of Strobe Drlver

is

still

STRETCHER

routine

the

oscilloscope

check for

Amplitude

oscilloscope

of

approximately 5

of the

strobe

forthis

used

to

will

work independently.

to TP101 2

a square wave response

should be

TP1032

to

signal

C1016, C1018, C1032,

noise at TP1032. The range

which

are

located

the Controlled

AUTO

25.0943 MHz

­relurn

is low

RESOLN

"PHASE

The

test. lf

to

the SYNTHESIZER

on the

=5

peak-to-peak.

V

and

check

p-p.

V

noisy,

or

or 25.0328 MHz.

aborted,

Strobe

and C1034

on the

Strobe Driver circuit board,

Oscillator

board

and IDENT

LOCK

press

Driver

board

with a frequency

for

change

? = 5

the

MHz,

values

for maximum

values

of

for

5-3I

and

is

Adjustment

Procedure

4)

Connec{ the counter

5.018868 or 5.006477

5) Connect
the Strobe

(6)

Press

g.

Error
either the

replaced.

is

1) Disable

I

set
Press

I

FUNCTIONS

r

Select

I

Select
Phase lock

2l

Connect the

test

amplitude that

test oscilloscope to

the

frequency.

<Blue-SHIFT>

Lock

assernbly,

lock

procedure

operation

Ampllfler - This

Phase

phase

the

SPAN/D|V to

<Blue-SHIFT> PULSE

menu is

menu item

1st LO

is

(DIAGNOSTIC

3

PHASE

now

disabled.

test oscilloscope to

oscilloscope

Time/Div

is

approximately 6

TP1032

to

MHz

to

abort

200 kHz.

now

displayed.

LOCK

to

and

for

check

and check

J504

the test.

gain

loop

sets

1st

LO, Phase

follows:

as

STRETCHER.

Detector,

The

AIDS).

(sub-menu

TP2037

20 ms.

V

item

(Figure

for a waveform

Check

peak-to-peak.

a

count

of either

for

5 V logic

which

is required

or

DIAGNOSTIC

and

press

0),

5-248)

levels

at

when

Error Amplifier

HELP.

and set lhe

with

an

HELP

Press

3)

LOCK

5-2481and

to enable

ENABLED.

vary

oscilloscope display

<Blue-SHIFT>

4)

Set the

TIMEIDIV

2), and SPAN/DIV to 50
Remove

5)

Gate. Set
pins

Monitor TP3081 with

6)
Trigger

(U2048-6)

I

Set

Note

I

by

the

Vary R3082

7)
beat

P3057

Loop

2

and 3.

the test oscilloscope externally

shown

the

the

phase

oscilloscope

test

beat

notes

the

frequency

lock

clockwise,

just

notes

later comparison. The

phase

Gonnect

R3082

(beat

return

to

AUTO,

to

(Figure

R3082

Gain

the

Figure

in

on

difference

(one

every

before

phase

beat

lock

the

from

stop

note

signal)

normaloperation.

to

FREOUENCY

note

and

that

the message

test oscilloscope to

to

stop and

varies

note

in

amplitude.

RANGE

kHz.
5-248l'.

test

This

turns on

fully

counterclockwise.

oscilloscope:

with

the signal

the

5-248.

Time/Div

to 5

ms

Volts/Div

and

the oscilloscope display.

between harmonics

MHz)

5

slowly, and

lock

occurs.

noles

and the

rnake a note

disappear

frequency

of

value will

This

when lock

TP3081

that

(Figure

the

Press

-

1.7

lo

strobe

5.5

to the Phase

Move P2035

TP2037

al

to

0.5

are
strobes

of the

produced

1st

They

of the

the amplitude

used

be

is

achieved.

indicates

(Band

to

V.

from
LO.

of the

for

5-40

8)

Set

R3082

tully

clockwise.

4g2AtP

& 4g2BlP

Servlce,

''Vol.

1

9)

Select

these

settings:

Adjustment

Procedure

FREQUENCY

RESOLUTION
TIMSDIV
VIEW A/B

10)

As

the

sweep

screen

position

oscilloscope.

1 1)

Tune

the
location
sPAN/Dlv

12)

Adjust

R3082

amplitude

13)

Calibrate

I Reset
r
t
I

t

I

the
Set SPAN/DIV
Center

the CRT

Carefully
on the

test oscilloscope.

Position

f rom

center

Monitor TP1031

Externally
t
I Yary

$et

R1061

Rl061

up.

r

Use the MANUAL

opposite
the display
occurs

as

controlfor

I

Adjust R1061

14)

center

Move
lest

screen.

P2035

oscilloscope lrom

SPANIDIV

BANDWIDTH

MAX

100
AUTO
Off

crosses the spectrum

produces

FREQUENGY

noted

in

the

100

to

MHz,

to set the

noted

Error

part

in

Count

TIMEiDIV

to 50

the

position

to

previous

TIME/DIV

set

amptitude

g (Enor

Break

Point

MNL,

to

kHz,

and

then

smallest

step

beam with MANUAL

set the FREQUENCY

the

CRT

screen

on the

trigger

with

beam

(400

kHz

Error

the test

the MANUAL

from

Amplilier

oscilloscope with

to mid-range.

clockwise

side

of

on the

the

beam

null

a

such

back

until the oscilloscope

SCAN

@ntrolto

center screen. As

test oscilloscope

reaches

ol the

that

pins

to

center

display on the test

points

break

1

and 2. Fleplace

the Error Amplifier

Hz

analyzer

beat

the
{subpart

to 1

of the

Amplifier),

display,

note

frequency

10),

s,

and

note

beat

subpart

adjustment R1031

lor

VIEW

100

to

control.
null

a

deactivate

increase it

SCAN

control

SCAN

center

screen).

board with

the signal

display

position

the beam
should

the

crosses

go

through a null.

screen, reset

oscilloscope.

400

are

kHz

P3057

board.

note

which

display

on the

dot at the

reduce

then

to

7,

ot this
as

vlEW

1.5x

the

foltows:

activate

A.

kHz.

of the

beat note

control

beam 4

4

divisions

the

test oscilloscope.

TP1031.

at

just

starts to

divisions

center

FREQUENCY

the

on

either side

and disconnect

screen

the

A.

.

step

display

break

on the

screen,

lf no null

of

the

492AlP

&

492BlP Servlce,

15)

Vol. 1

Fleduce
the
the assembly
phase

SPAN/DIV

absence

of an

lock noise

and

section.

to 200 kHz

message

error

reinstall

and ensure

and

rnodule

the

a

in

check as described in

phase

that

sweep.

the

the

Replace

instrument.

Perlormance

lock

occurs,

the covers

Perform
check

''5-41

by

on

the

Adjustment

Procedure

Option

lnstruments

17.

Adjust

R3024

a.

Set the

FREQUENCY

FREQUENCY
REFERENCE

MIN
AUTO
TIMHDIV
VERTICAL
VIEW

b. Place

the 50 O RF INPUT

lf needed,

c.

center screen.

d.

Set

the

DISPLAY

Option 07 VR

on the

front-panel

RF ATTEN

RESOLN

tuB@On

VR

the

set the FREQUENCY

RESOLUTION

to 2 dBIDIV.

VR

Mother

SPAN/DIV
LEVEL

DISPLAY

module

board

#2.

conlrols

on an

via

a 50 O

BANDWIDTH

follows:

as

extender,

cable.

Band

100

MHz

200

kHz

-20

dBm
0dB
On

AUTO

10

dB/Dtv

and

control

to 3OO

Leveting

connect

keep

to

KHz

the

and

the

CAL

OUT signal to

100

MHz

signal

the VEHTIOAL

at

e. Set the front

signal.

t. Remove

to
button.

g.

Reset

h.

fdiusl

for a 7-division

i. Disconnect

module

the

the 50

75 o RF

REFERENCE

the

R3024

the

into

the

panel

AMPL

O

cable

INPUT via

on the VR

excursion

75

O

cable, disable

spectrum

CAL for a 7-division

from

a75 dtcable,

LEVEL

Mother

of the 100 MHz

analyzer.

instrument,

the

and

to +20 dBmV.

board

#2

75

the

push

(Band

signal.

Ct input,

excursion

connect

the

the 7s

6 Gain,

and install

of

100 MHz

the

CAL OUT

o RF tNpur

see Figure

VR

the

signal

S-23)

5-42

492AlP

&

492BlP Service,

Vol.

1

Adiustment Proeedure

DC503A

il

o

TR502

Outl

LO

1st

o

LO

OPTION

P1024

(rFouT)

42 MODULE

P101

(our)

2 P1010

(tN)

rrn

I

e

I

O

lst LO

O

Figure

TR502

OUTPUTLEVEL
VAR

dB

-25dBm
O FREO

5-25:

Option 42

18.

Adjust

C1016,

This

adiustmsfi

module

the
a.

Connect the test

b. Set

CENTERFREQUENCY

RESOLUTION
MHZ

the

SPAN/DIV

adiustment

Option

C1020

and C1024

generally

has

bgen replaced.

front-panel

7L14

BANDW|DTH

XEF JE0I'''"*"

DISPLAY T/B

set the 7L14

c.

screen.

Time/Div

test equipment

42 Module

in

the Option 42 Modute.

needs

to bs

equipment

controls of the

as shown

11OMHz
2MHZ TERM

A SLOPE +

3 BE"

OFF

Manual,

to

and

setup.

performed

insrument

test

CHANNEL A

ATTEN X1

only

in Figure

5-25.

atterthe circuit

as tollows:

DC5o3A

F3-'3+3-

adjust the cRT beam

in

board

50 A

ffirour*""o

(dot)

to center

492AlP

&

492BlP Service,

Vol.

1

5-43

Adjustment

Procedure

The

d.

DC503A

LEVEL

as

FREQUENOY

e.

Set the 7L14

f

. Adjust

c1016, c1020

bandpass

readout

necessary

for

for

indication

an

Time/Div ior

-3

at the

dB and

should indicate

a triggered

calibrated

a

and

c1024

-6dB

approximately

count,

110.0

of

display.

for

maximum

points.

and adjust

MHz

on the

ampritude,

110.000
the 7L14

counter.

symmetry,

MHz.

Set

CENTER

,

and

1) Adjust
6

dB

2l

Check

3)

Check that

center

4l

check

A

slight

change

module.

g.

Check
1

set

)

2)

Check
amplitude

h. Check

1) Increase
1

dB

by

the bandwidth

points.

that bandwidth

-3

the

dB and

screen, within

that

in

the

Coupled Fonruard

7L14

the

that the

Input

the

increments

0.5

division

ripple

any

display may

spectrum

display on

(-5

dBm,

Compression.

TR502

the

until the

(1

dB

symmetry

at

the 3 dB

0.5
present

t0.5

point

-G

points

dB

division.

on the waveform

NOTE

be

abserued

(lF

Gain

Analyzer

the

t3

dBm).

Output Level

amplitude

compression).

OUT

Reference

7L14

and REFERENCE

divisions

is

MHz,

5

are an equal

when

the

p1

port

Level

is

between

displayed

MHz)

1+1

+1.0

is

<0.2

cover

AZ4).

4

and 7

by

the

to 0

at the

3

MHz.

distance from

(0.a

div

is

reinstatted

dB).

dBm.

divisions

LEVEL
7L14

setting

decreases

dB

on

in

and

the

in

5-44

2)

check

i.

Check Forward

1)

Return

the

2)

connecl

3) Connect
cable.

4l

Adjust
screen

5)

Check that

11.5

that the

Gain.

TR502

the

module

lF

a 50 ct

the OUT

the 7L14

(8

divisions).

lhe signal

dE

i-20

signal disptayed

Output

Level

OUT.

termination

(P1012)

Reference

lo the

connectorto

Level

displayed on the

to

-Zg

dBm).

492AlP

dBm

on the

-25

to

lF

our

until

7L14

indicates

remove

and

the

connector,

7L14

the

the

display€d

RF

signal

7L14 indicates

& 492BlP

Servlce,

>0

dBm.

connection

p1024.

with

Input

is near fult

-21.5

dBm

a 50

Vol.

to

o

1