Tektronix FG 504 Service manual

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Section1SPECIF

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iii

1-1

2-1

S

Section 4

Section5MAINTENANCE.

Section

Section7

Section8

Section9

CALIBRATIONPROCEDURE

P

erforma

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TIONS

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DIAGRAMSANDILLUSTR

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ICALPARTS

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. . . . . .

ATIONS

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4-1

4-3
4-8

5-1

6-1

7-1

8-1

REV

ΜΑΥ

1981

F

G

504(SNΒ

F

ig

.

No

.

2-1
2-2

2-3
2-4

2-5 Trigger SignalAmplitudeRequirements

2-6

2-7

2-8
2-9
2-10

2-11
2-12

2-13
2-14

2-15
2-16

2-17

040000&UP)

L

IST

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FG504In

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2-6

2-8

2-8
2-9

2-9
2-9
2-9

2-10
2-10

2-10
2-10

2-11

viii

ST

F

ig

No
2-18

2-19
2-20
2-21

2-22
2-23
2-24

4-1
5-1
5-2

8-1
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8-3

8-4

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Α

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Table

1-1
1-2

1-3
4-1

5-1

5-2

L

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No

E

r

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lect

E

nvironmentalCharacteristics

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TestEquipmentRequ
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F

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to

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frequency

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.

and

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D

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100sto1ms

.

.

if

.

switch)

decades

.

.

Table

1-1

(con

t)

Specification-117G

504(SNΒ040000

&

UP)

Internal

Sweep

TPUTAmp

OU

Accuracy

WEEP

S

V

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N

TR

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F

latness

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0

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40

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0

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0

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20MHzto40

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40kHz

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40 kH

MHz.

MH

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least30Vρ-ρi

circuit,

W

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W

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to40MH

least15Vinto50Ω.

at

z

.

.

from

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40

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z

40

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wit

.

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kH

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.

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h

aracteristic

C

Table

1-1

(cont)

P

erformanceRequirement

S

upp

lementalInfor

mation

Output

ATT

ENUATO

Accuracy

VA

Riab

leCon

OFFSETRange

Into

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pen

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I

n

Ω

to

50

OutputWaveforms

W

it

h

outUseofSY

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control

trol

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MME

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0

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itional

t

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circuit

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oltage

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30

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3

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300mV

95mV

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to re

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signalamp

p

ut

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±11

d

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n

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.25Vinto50Ω.Offset

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ithSY

MMETRY

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ngle

Symmetry

10Hzto

400kHzto40

L

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10

Hz
400kHz to4MHz
4

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400kHz

400kHz

to

zto40

(variable)

MHz

MHz

W

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W

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symmetry
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for

to

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frequencyby

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all

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~80%

for

TRY

control

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above

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Typically
0

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ο/ο

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.
.

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FREQUEN

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W

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W

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fromthe 20

p

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oi

from0.001Hzto 10Hz.

ο/ο

.
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.

of

Hzdial

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e

waveform.Typically

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REVNOV1981



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Sine-Wave

TotalHarmonic

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20Hzto40kHz

40kHzto1

1

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ANDFALL

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F

IXED

Aberrations

VARiable

(cont)

MHz

to40MHz

TIMES

Table

1-1

(cont)

erformanceRequirement

<-0.5ο / ο

.

h

Greatest

30

dBdown
Greatestharmonic
20d8down

_-6

measured

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armonic

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10%to90%

mV

30

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7

ms

at

least

at

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msin7

into50Ω

steps

the

10%

controlhas

steps

load

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and

Specification-FG

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Typically

20Hz,

measured

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+35°C

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FREQUENCY

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waveforms

waveformmust

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der the

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exceed

fall

times

to

following

to

set

also

.

AM

INPUT

Dc

4

MHz

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E

xternal

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M

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to 4

MHz

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When

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mo

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modulation
put

amplitude

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>_10kΩ

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or

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frequencies

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100

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the

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20Hz

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out-

REVNOV

1981

1-5

Specification-FG

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N

8040000& UP)

(S

Table

1-1

(cont)

C

E

xternalTR

ΦLOCKInput

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ΦLOC

IG/GATE/

M

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F

requency

E

Minim u

M

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K

h

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Trigger

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n

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ceRequirement

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75ns

Su

.

lemental

pp

Information

d

+20

MHz.

100Hzto40MHz

range

Hz

to4MHz.

±80°

Adjust
0

100

.

from

For

gating

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generator

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from
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40

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will

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external

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z

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front-panel

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of

amplitude/hour

.

REV

NOV

1981

Table

1-2

S

pecification-FG

504

(SNΒ040000&UP)

Temperature

Operating
Storage

Altitu

de

Operating
Storage

V

ibration

Operating

Shock

O

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Transportation

C

haracteristics

andnon-operating

and

non-operating

ENVIRONMENTAL

C

HARACTERISTICS

0°Cto+40°C

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1

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To

15,000

To

50,000

0

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mm

50

g's

(half sine),11ms,12shocks

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feet

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meters)

meters)

Safe

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air

required)

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.

Transit

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F

inish

W

eight

Overall

Dimensions

C

haracteristics

PHYSICAL

Table

C

HARACTERISTICS

A

nodized

3

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REV

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dial.if

pushb

utto

T

R

IG

so

t

he

TRIG

t

he

sweep

R

A

FREQUEN

he

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ngthe

P

FRE

to set

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andconnect

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NPU

sweep

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SWPpus

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nobtoobtain

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for

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ials

h

mic

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OG/

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button

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e

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lower

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at

starts

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h

button

t

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the

LIN

RT

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t

t

or

he
he

z

.

is

.

.

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swee

p

any

time

at
li

near

swee

connector

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xternal

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k

,andSwee

oc

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xternal
1Vρ-ρ
(+1Vto
mi

+0
amplitudeis
must
signals

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.5

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beatleast

around

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may

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hin

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p

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V

3Vρ-ρ

theSTO

htheLEVEL

signal
example,

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n F

bypus

voltageisavailable

p

.

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input

+10V).Wit

theexternal

.5

symmetrical

and

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for

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h

ese

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setbythe

must,

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(+1

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igure

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output

fre

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pushbutton

at

theS

WEEP

Gate,

modes

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at least,
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ase

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ig

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points

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min.)

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r

Signalamp

--------

___-____

-

-

litu

d

erequir

LEVEL

+1VtO+10V

LEVEL

+1V

LEVEL

_

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ements

(mi

to

ndtriggeri

a

TRIG

W

aveform

n

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.)

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V

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ng

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2-7

Fig

.

waveforms

.BASIC

selectedby

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CTIONS.Squ

fro

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ns.

gle,and

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'Dutycycle

d

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oftheTRIG

of

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ase

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theOUT

relationships

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waveform

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aveform*

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asic

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waveforms

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nedfrom

rol

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t

he

.

ΜΑΥ

1981

Fig.2-9
andfall

formed

.VARIA

BLE

timesinthesquare

.

RISEAN

DFALLTIMES.By

wave

mode

r

va

ryingthe

va

ious

pulseshapes are

rise

Operating

F

ig.2-11
2-10.Selectth
logarithmic
available

.LOGARITHMIC

rate.T

.

Instructions-FG

WEEP

logarithmicramp.

e

S

he logarithmicrampvoltage

504

.Use

The

NΒ040000&UP)

(S

t hesame

frequencyisswept at α

setupasinFig.

isnot

exte

rn

ally

F

ig.2-10
andtheinternallinearrampforα
sto

REV

.LINEARSWEEP.Select

i

pfr

equencies

ΜΑΥ

nthe

1981

selected

thestart

swept

time

.

and

stopfrequen

output fro

mthe

start

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to

2-12

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tria

9

u

sweepi

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ig

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waveform
.52kHzandt
seful

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ramp

OWB

AND S

sweptbyαlinearr

he stop

row

.

band

frequency

sweep

WEEP.The to

amp.The

10

is

testing.Thebottom

ptraceshowsthe

startfreq

.52kHz.This functionis

t r

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glish2-

uency

aceist

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9

O

p

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F

ig.2-13.GATEDOPER

output
appliedtothetr

pushb
thewaveforms

Instructions-FG

waveforms

utto

n p

ressedin

are gate

504(SNΒ040000&UP)

ATION.Theto

t

h

and

e

iggerINPUTconn

.Notethe

dof f

bottom

.

tr

aceisthegatingwaveform

additional

pthreetracesar

ectorwit

hthe

cycle

completedafter

e various

GAT

E

F

ig.2-15.PHASECONTROLO
illustratesPHAS
super-impose
T

h is

cont

trace

isthe

dtr

rolprovi

triggering

E control

aces

illustratetheeff

desapp

wavefo

usageinthetriggered
roximately

PER

ATION.Thisphotograph

ectoftheph

rm

±80°ofshift.Th

.

mode.Thefive

asecontrol

ebottom

.

F

ig.2-14.T

various

outputt r

r

m

wavefo

de

selected

mo
is

completed.

E

nglish2-10

RIGGEREDOPER

aces

selected.Th

ap

thetriggerINPUTconnector

pliedto

.Notethatonly one

ATION.Thetopthree

e b

ottom

trace

cycleoftheoutput

t

r

t

hetr

is

wit

arethe

aces

iggering
hthe TRIG
waveforms

F

ig.2-16.PHASE LOCKEDLOOP.Thebotto

ap

pliedtotheINPUTconnectorinthe
operation.Themiddletraceisthe
i

nputsignal.Thetoptracesshowtheeffect of

outputphase lockedtot

mtr

aceisthesignal

ΦLOCKmode

t hePHASEcont

REV

ΜΑΥ

of

he

rol

1981

.

F

ig.2-17.A
100ο/οmod
signal.±2

d 0 V)

arou

n

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~

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ulatede

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.

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MODULATION.Thetop

nvelope andthe

latestheoutp

bottom

ut

t r

aceshowsthe

themodulati

trace

100

ο / ο.(5VΡ-Ρcentered

ng

eratingInstructions-FG

O

p

ig.2-19

F

thelowest

pushingthe
obtainedin

.LOWFREQUEN

five

MUL

LDbutton.The

HO

hismanner

t

CYHOLD.The

TIPLIERsetti

steps

.

ngs

504

can
onth

N Β

(S

output

h

be

time exp

is

eldat

040000&UP)

t

he FG504

of

any

level

osure

were

in

by

UPPRE

Fig

.

2-18.S
shows
e

α

n

velopewhilethebottom

waveform.T
andthe
modulati
suppr

bottom

ng

essed carrie

SSEDCARRIERM

d

ouble

sidebandsu

he upper

peak

waveformmust

roperation.

pp

t r

ace

kofthemodulating

pea

isat-10

be ca

UL

ATION.Th

OD

ressed carriermodulation

displaysthe

V

overall

.

The

u

llyadj

r

ef

etopt r

mo

waveform

levelο1 t

ustedfortru

d

ulating

is at0V

ace

he

e

ig.2-20.DELAYED

F

reavailablebyusing

a
generator.T

1

οtheS

O

UTcon

I

NPU

amount
settingoftheTR

asαdelay

hemi

TRIGI

WEEP

r.Thisrampisapp

necto

Tcon

nector.Thetop

ofdelayispropo

IG

generato

NEEMEMmi

mmli
MENEEME

.

.ν

.

.~,

.*..-~..

.~~

PER

ATION.Αwiderangeof

O

theinternal

dle

t r

aceistheunder

d

NPUT.Th

traceisthe
tionaltotheswee

r

LEVELcontrol

rtosetthe

sweepge

ebottom

liedtothe

.Be sure

STO

P

neratorasα

i

n

put

laye

d

trace

is attheLI

external

delayedoutp

p d

uratio

hen

usingtheswee

w

FRE

d

ial

Q

delay

signalapp

pulse.T

ut

nand

fully

εεω

,

2028-18

times

delay

lied

WP

NS

trigger

t h

.

he

e
p

REV

ΜΑΥ

1981

En

glish 2-11

Operating

I

n

structions-FG

504(SNΒ040000&UP)

ToneBurst

The F

usedfor
TEKTR

thetriggerINPU
operation.Setthe
pulsed
sweep

fre

quencies.T

oftone

Testing

G

504,

toneburst

ONIXPG501

uration

andrepetitionrates.Now

time

forthe FG504.Selectthe

he

burstsasshowninFigure

wit

h an

external

testing.Connectth

(or

T

connector.SelecttheGATEmodeof

external

output ofthe FG504

p

ulse

equivalent)

pulse

generator

2-21

generator,

e

output

pulse generato

forthedesire

selectth

will

.

start

ηοω

e

an

be α

may

of

d

esired

d

stop

series

be

α

r

to

d

F

ig.2-22.L

frequencies

inear

sweepshowing skewe

.

d sp

acingof

filteroutput

F

ig.2-21.TONE

ramp

f r

omthe LINSWEEP

F

ilter

Testing

Th

e

swept

q

uite

suitable

FG504inthisapp

Mode.F

using

logarithmic

igures

BURSTTE

frequency

for

2-22and2-23

STING.
OUTPUT

capabilitiesoft

sweep

lication,

sweeps

Thelowertraceisthelinea

terminal

testing

.

filters.Wh

it

is

besttousethe LOGS

illustratethe

.

he FG504makeit

en usingthe

advantages

WP

of

r

Fig.

2-23.L

outputfrequen

oga

rithmic

cies

.

swee

pshowing

eve

nsp

acingsof

filte

r

En

glish2-

1

2

REV

ΜΑΥ

1981

P

ulseShap

Theexternal

pulseshaping.Connectthep

triggerINPU

square-wave
wit

htheTRIG
levels,
changedasdesired.Figure

tion

.

ing

triggering

Tconn

mode.Thetriggering

LEVEL

andsymmetry

featureoftheFG

ector

n

a

control.Theriseand

ofthe

504a

ulsetobe shapedtot

d place

clean

2-24

theFG

level

outputpulse

illustratesthisapplica-

504inthe

maybeselected

fall

dap

may

tsfor

he

times,

be

O

p

erating

REP

IftheTek

Tektronix

howi ng:owner

s
individualatyour

complete

the

servicereq

Save

and

wasshipped.Ifthe

n

ot

available,repack

Surrou
protectthefinishoftheinstrument.Obtainαcarton

corrugated cardboardofthecorrect
andhaving
morethanthe instrumentdimensions.Cushio
instrumentbytightly
or urethanefoam

si

des

.

stapler

.

Instructions-FG

ACKAGI

tronix

Service Center

instrument

uired

re-usethe

ndtheinstrument

inside

NGFO

instrumentisto

(wit

hadd

firmthatcanbe

serial

.

packageinwhichyour instrume

original

agetheinstrumentasfollows

dimensionsofηο

pack

betweencarto

Seal

carton

wit

504(SNΒ040000&UP)

RSHIPMEN

besh

ipped

for

service

an dthe

ress)

number

packagingisun

withpolyethylenesheeti

ingthree

n

an d

hsh

ipping

air,

or re

p

attachαtag

name

contacted.Inclu

an d αdescriptionof

fit

carton

less

thansiχ

inc

hesofdunnage

instrument,

tape

or

industrial

for

strengt

T

to

of

use

:

ngto

inches

nthe

on

all

α

an

de

n t

or

of

h

Fig.

2-24.PULSESHAPINGCA

the

triggering

signal

n

T

PABIL

.

ITIES.T

helowe

rtr

ace

is

p

ounds

he carton

.

test

strengthfor

your

instrume

tis200

REV

ΜΑΥ

1981

En

glish2-13

Section

3-FG

504(SNΒ040000

&

UP)

Introduction

The

followingisα

in

theFG
schematic diagrams
the

manual

Triangle

T

his
capacitors,positive
semiconductor
triangle

The
QUENCY
sweep,

The
(START)dial
potentiometer

(106),

linearityofthe
frequency

U

30A

mode,

t

hrough
control
input
in

the

frequency

voltage,
FREQdial,
amplifier

and
are

summed

3

of
and
from

controlspositive

504.R
aidinthe

to

Generator

circuitry

switchesnecessarytogenerate

waveform

current

Hz

when

calibration

R

128isswitchedinto the

control

.

When

the

sweep

STOPFREQ

sets

ofU25B

swept

an

U

the voltage

U45

and

decreases

155isfedtothe

U

.

sources
(START)
operating

suppliedvia

is

R

145.On
FREQUENCY

theFG

ramp

maximum

the

.

Thisaction

frequency

input

d

t

he

sweep

summed

are

30B

servesasα

from

atpins3of

U155

foranincreaseinfrequency

current

T

HE

description

efer

to

on

the

understanding

orMainLoop

consists

n

egative

and

and

inthe

voltage

thehighest

voltageisfedinto

504

operatesinthe

isfed

controlR5

voltage,

ram

the

45

U

increases

baseofQ165

source

of

the block

foldoutpages

of

α

current

controlledby the

are

STOP

swept

for

the

operational

Hz

operational

to

ramp
setsthemaximum
mode.The

phase

p

voltage,

atpin6ofU25B

level

FREQUENCY

andU155.The

for

α d

transistor

R

Y

O

the

electrical

diagram

this

of

(Diagram

d

iode

bridge,

sources,

controls,aswell as

frequency

FREQUENCY

amplifier

MULTIPLIER

circuittoim p

(START)dial

operational

swept

amplifierU25B

an

d

b

ufferU5A

voltage

voltage

lock loop

throughthe

shifter.These

Hz

ecrease

The

output

.

O

circuits

and

the

back

at

description

1)
timing

and

the

mode

U513

setting

rove

.

amplifier

frequency

lied

ap

voltage

Q55

to the

p

or

upperlimit

controlled

correction

Operational

.

voltages

(START)

at

frequency

in

The

output

.

fromU45

.

the

the

asic

b

FRE-

and

This

.

This

STOP

pins

F

of

the
.

Hz

the

ial

d

PER

O

To un

derstand

loop,

assume

off.Current flows

090

is

throughCR180.Diodes
biased

.

withnocurrent

C

R190.Current

throughdiodes
capacitors.In

tings,

α cap

cap

acitors;switches
opens
Q230,

W

currentdivides
andthe
C210.One-tenth

R204

R
the
ten.The

resistances

d

voltage
the
through

Q255A

constant

Q255A

amplifiers.Transistors

Q285

the

input

the

the
currents

U

This

.

Q225

ith

switches

remaining

charge

to

200

and

effect

iscussion,

betweenpins

action

positive-going

The

.

The

drivesαset

and

emitters

The

ramp

comparator

of

positive

emitterofQ310

375

.

ATIO

operationofthe

the

that

switch

from

CR188

the

slowest

acitance

S240-3

capacitance

and

their

associated

S240-5,

.Most

of

current

of

the

C210

because

R204istentimes

multiplying

of

multiplying

are

added

the voltage

2

ofU215,

R202

otherhalfofthe

current

Q295

of

is

input

forhigh fre

Q225,

to

remain

Q255A.Therampat

to

of

the

other.The

Q280

and

also

fedtothe

amplifierU375

ofU375

uency

q

N

triangle

driver

Q100

the

from

flowing.No

thepositive

an
multiplier

6,

and7closed,

the
current

the

factorisincrease

in

at

and3ofU215

constant

rampisapplied

two

Q270

servestocompensate

negative

CR182

d

C

R186,

five

MULTIPLIER

and9close

multiplier

resistors

current

flows

through

flows

the

the

resistanceofR

valueofC210by

series

pin3ofU215
an d

Q230

buffer,

fet

complementary

and

ramp

Q295

.

base

through

componentsatthe

conducting

is

and

CR184

current

current

charging

replaces

consists

thepositive

flows

R200,

through

combinedresistance

with

remainsatzero

causes

.

to

Q255B,

Q280compose

output

Q310to

of

through

R336.The

generator

an

current

and

through

d

C210.Forthis

rampsup.

the gateoffet

source

back-

are

flows

through

source

and

as

the

flows

the

timing

switch

timing

the

S240-16

of

U

capacitors

timing

R202,

R

204,

R200

202.Thishas

α

factor

additional

the

current

supplies

source

Darlington

one

taken

is

thenegative

R322,

and

waveform

the

inputs

set-

215,

and
and

of
of

The

and

set

from

drive

d

.

of

;

to

at

of

The

SYMMETRY
between
collectorofQ165
mirrorisformedby
matchedpair
emitter-to-base
rents

0165

the

are

equal.This

exactly

positive

of

voltages.Therefore,

matches

control

negative

and

connects

transistors,

to

transistors

ensures

the

collector

adjusts

that

the

current

the

baseofQ175.Α

Q170A,Β,

0170

Α

the

currentofQ175

current

sources.The

and

and

Β

,

their

collector

collector

balance

current

Q175.The

h

ave

equal

current

.

cur-

of

W

iththe
voltage
the

voltage
ramp
positive

baseofswitching
base
direction,

ramp

atpin3ofU375isabout

atpin9.

in

andpin

Q80.As

Q80

the

rises

of

risinginthe

This

makesU375

positive

7negative.Pin7ofU375

transistor

the

decreases

direction,pin6of

ramp

conduction

0.4V

Q65

and

continues

positive

d

irection,

more

positive

inoperative.As

U

connectstothe

connectstothe

pin

6

inthe

and

Q65

the

than

the

375

goes

positive

increases

T

heoryof

Operation-FG

504(SNΒ

040000

&

UP)

conductionuntilthepair

from

about-2.8Vto

-2

.8

V

.

This

actiondisablesthe

U

375

anden
conduction,
condution.Curre
an

dthepositive

CR188

throug

hCR

cu

rrent

C

R

184.This

n

egative

output.Astheramp

p

i

n 14

negative.Wh

goes

ficiently
tion,thepositivecurrent

cap

acitors,

Thebases

nn

ectedtothenon-invertingou

co
outp

uts
common
generatethe

S

q

uareWave
Switchingtransistor

Wh

en

collectorofQ65isinits

p

assedtothe
baseofQ456.TheemitterofQ456
When0456isconducti

hCR

wit
andt

he square

the

switching

co n

dution,

movesinth
as

Q470isnotconducting

V

ariableRise

Th

is
sources,
an output

currentsourcewh
source.The
curren

t throug

changingthevalues

T

he

cap

acitors,

R

536,R538,R584,

0540

andQ580
theVAR
co n

trolisi

grou

n

de

current throug
source

integratingcapacitors
waveforms

ablestheupp

Q90

comesintoconductionan
n

andCR

source

gradually

negative,

fromth

the

470bac

circuitry

current

d

transistors.An

186

180asQ100isoff.Current

now

actio

direction,

goes

andth

of

emitter
ese

emitter

T

R

IGOU

Generator

rampis

baseof0450

k-biased.Current

wave

waveform

back-biasingCR

n

egativedirectionby

e

andFall

consists

α currentswitchwit

.

buffer

rise

and

hthe constant

C592throug h C598,isvaried

asnecessary.Thecur

controlth

nthecalibrated

endofthe con

htheemitter resistancesofthecurrent

.

switches.Pin3ofU375

about-3.2Vand

erpair.Wh

t

flowsth

now

ntsource,

curre

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back-biased.

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transistor

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voltagereac

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rid

b
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R

1112,andR1114provide
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differentialou

transistors

outputamplifierprovi

nalamplifier.ThecollectorofQ825

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followeroutput

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signal,the

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Q970

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100A

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Q825

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ase

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p

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invertingoperational

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Q1450,

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p

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e

Calibration
Adjustment

Procedure-FG

Procedure

504

AD

(SN

Β

JU

040000

ST

&

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MEN

T

PR

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D

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Introduction

Use

this

AdjustmentProceduretorestore
original
Procedure

failstomeet

electrical

tion,orif

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repairs,

p

rocedure

P

erformanceReq

TestEquipmentRequired

required
given
for

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specifications

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source
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module
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topofthe FG504 andthe
toward

operate the FG504

performance

not

need

characteristics

thePerformance

satisfactorily

the

AdjustmentProcedureisrecommended

Satisfactory

ensures

Thetest

accurate

If

uipment

Disconnect

One
circuitrytop
FG504iso

equipment

for

adjustment

for

the

test

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correctly calibrated

other

test

used.

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.For

accesstoα11a

extender

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oriented withthe

thetop

endofR14shouldbe

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completionofall

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test

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procedure

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minimum

equipmentisassumed

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connect

500-Series

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of

(do not

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cables

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will

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the p

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efertoadjustment

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In

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voltmeterrangeto 20Vdc.Connectth

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Disconnectth

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e

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ground

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nn

ector

co

p

ush

buttonsin.ReleasetheHOLD/

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Disconnect

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oscilloscope

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