Tektronix SG 503 User manual

Te k t r o n ix, Inc .
Ρ . Ο . Box500
Beaverton, O r ego n
97077

Serial Nu m be r
ο7 ο - 1622 -oi
Ι Ν S m Γ UCTION MANUAL
F i r st Pr i n ti n g AUG 1974

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SECTION 1
S E CTIO N 2
CHA N G E I NF O RM ATIO N
R E V .
C, OCT 1977
WARNING
THE F O LL O W I N G SER V ICI N G I N STR U CTIO N S A RE F O RU S E BY Q U A L I F I E D PER SO NNEL
O NL Y . T O A V OID PER SO N A L I NJUR Y, DO NOT PERFORM ANY SER V ICI N G OT HER THAN
THAT CO N TAI NE D IN O P ERATI N G I N ST RU CTIO N S UNLE SS YO U A RE Q U A L IFIED
Τ
0DO SO .
SECTION 3 AD JUST ME NT 3-1
S E CTIO N 4 M AINTE N ANC EAND I NTERFACIN G I NF O RM ATIO N 4-1
SE
CTIO N 5 CI RC U IT
DESCRIPTION 5-1
SE CTIO N 6 OPTIONS 6-1
S E CTIO N 7 REPL AC EA BLE EL ECTRICA L P A
R
TS
7-1
SE CTIO N 8 DIAG RA M A N D CI R CU IT B OA R D ILLUSTRATION 8-1
SE C TI O N 9 REPL ACEA BLE M E C H A N ICA LP A R TS AND
E X PL OD E DV IE W 9-1
P age
O PER ATI NG I N STR U CTIO N S 1-1
S PE CIFICATIO N AND PERF O RM A N C E C HE C K 2-1

F ig . 1-1 . SG 503 L eveled Sine W ave Generator plug-in module .
SG 503

REV, Β , OCT
1977

Desc r i p tio n
I N TROD U CTIO N
T h e SG 503 L evele d Si n e- W ave Ge n erator
p
rovides α
regulated,
co
n stant-amplitude versus fre quen cy outp ut
i n to α50-oh m load . T he SG 503 is p rimarily intended to be
u sed as an oscilloscope cali b ration device for measuring
bandwidt h s up to 250 mega
h
ertz . The SG 503can also be
used as α signal source for general electronics design and
develop me n t .
N i n e overla pp i ng ra n ges cover t he fre quen cy ba nd
fro m 250 k ilo h ertz to 250 mega h ertz, wit h an a dd itional
range reserved for α50 k ilo h ertz reference frequency .
Α digital cou n ter wit h automatic rangi ng a nd α front
panel L E D readout is used for freq u e ncy i nd icatio n .
REV .
C,
OCT 1977
F ig . 1-2 . P lug-i n i n stallatio
n and removal .
I n stallation and R emoval
CA U TIO N
Sectio
n 1--SG 503
Tu rn
th e p owe
r
mo d ule off before i n serting
t
heplug-
in ; otherwise, d
amage may occ u
r
to th e plug-in
circuitry . B ecause of t h e high current d r aw n by t h e
SG 503, it is also r ecommended t h at t h ep ower
module be tu r ne d off before removing t he SG 503 .
R
efe
r
to Fig . 1-2
.
C h eck to see
t
h at th e plastic
barriers on t he
interconnecting jac
k of t he selected
power module com p a r tment matc h t he cut-outs in
t h e SG 503 circuit boar d edge connector .
Alig
n
th e SG 503 ch assis wit h t he upper and lower
guides of t h e selecte d compartment
.
P
us
h
t
he
mo d ule i
n
a n d press firmly to seat t he circuit
board
in t h
e
i n
ter-
connecting j ac k .

O p e r ati n g
I n str u ctio n s-SG 503
LED Dis p lay
T hr
ee- d i git r ea do u t
I nd icates ou
t pu t f r e-
qu e ncy
FREQ UEN CY V A R IA BLE
Selects o u t pu t fr e-
qu e n cy wit h i n t he de-
s i re d fr e qu ency r an
ge
OUTPUT A MPL
IT UD E
V O L TS Ρ - Ρ
Deter
m
i
n es t he p ea k -
to- peak a mp lit
ud e i n to
t he atte nu ato r (A MPL I-
TUDE
MUL TI PL I ER)
FRE Q UEN CY
V
A R IA BLE
FRE Q UEN CY MHz
ι
A MPL IT U D E
MUL TI PL I ER
r 1D0

CALIBRATED
WITH
CA BLE
ΡΝ 012- 0482 00
250

INTO 500
OUT
PU T
2ο =
5012
τεκτιιοηιχ ®

SG 503 LEVELE D SI NE W A VE G ENER ATO R
F ig . 1-3 . SG 503 co
n trols and conn ecto r s .
A MPL IT
UD
E
MUL TI PL I ER
T
hree-p ositio n leve r
switch to allow c h oice ο 1
un atte n
uated o r atte n -
u ate
dou
t
pu t am p lit ud e .
O u t pu t am p lit ud
e is OU T-
PU TA MPL IT U D EV
O
LTS
Ρ - Ρ co n t r ol setti ng times
t h e facto r i nd icate d by t he
A
MPL IT UD E MUL TI-
PL I
ER switc h p ositio n
FRE Q UEN CY R A N
G E
(MHz)
Selects t he d esi r ed
fr e qu ency r an ge as
i
nd
icate d
O U T PU T
BN
C conn ecto r o u t pu t
te r mi n al .
U se prope r
coaxial cab le as i
nd icate d
on f r on t p a n el
1622-03
REV . Β ,
OCT 1977

Toremove
t h e
SG 503,
ρυΙΙ
on
t he
release latc h located
in t h e lower left corner, until t he interco nn ecting j ack
d isengages an d t he SG 503 will sli d e ou t .
P ower application to t h e SG 503 is i n dicated by t he
t h ree-digit L ED ( L ig h t- E mitti ng Diod e) dis p lay being
lig h te d . Tur n t he F REQ U E N CY R A N G E (MHz) control
between t h e deten t p ositio n s to test t he LE D's (888
d is p lay) .
R
eset t he FREQ UE N CY R A N G E ( MH z) co n t r ol to
t he desired ra n ge . Allow 15 to 20 min utes warmu p time fo r
all eq uipment before usi ng t he SG 503 .
Over h eati ng
T h e SG 503 is designed to o p erate at an a m bie n t
tem p erature from 0° C to +50'C . H owever, w hen
op erati
ng
several p ower su pp lies i n α multi-plug-in power
m
odule, esp ecially at low output voltages, or w hen
o p erating close to ot h er h eat-producing equipment,
inter-
nal tem p erature may excee d safe limits andactuate α
t h ermal cutout i n t he power mo d ule . R efer to t he power
m odule i n str u ction man u al for more complete informa-
tio n .
Controlsan d Connectors
R efer to Fig . 1-3 . Even t h oug h t he SG 503 is fully
calibrated an d rea dy to use, t he fu n ctions an d actio ns of
t he controls and co nn ectors sh oul d be reviewed b efore
atte mp ti n g to use it . P ress t he OU TP UT button to apply
p ower to t he SG 503 .
CAUTION
c
If t h e
instrument
is op erate d at t he extre m e limit of,
or beyon d α ban d range, t he front-panel d isplay may
flas hα blin king indication, alerting t he use r to an
unleveled out p ut am p litude condition .
OPERATING CONSID
I n t r oductio n
ATIO NS
T he SG 503 h as b een d esigned and cali b rate d wit hα
h ig h qu ality coaxial cable ( P art N umber 012-0482-00) to
o pe r ate as α closely matc hed system w h e n termi n ated into
α50-o h m loa d . See F ig . 1-4 Α . The absolute amplit ude
across t h e loa d
is
d irectly relate d
to
its im ped ance . P art
N um b er 012-0482-00 should be connected directly to t he
equ ipme n t under test if t h e input impedance of t he
equipment is 50 oh ms . F or eq u ipment wit h an input
impe d ance muc h greater t han 50 ohms, an accurate 50-
oh m termination
s
h
o
u
ld
b e connecte
d b
etween t he coax-
ial cable and t he e qu ipment . Teecon n ectors or wire of any
ty pe b etwee n t he 50-oh m terminatio n and t he eq ui p me n t
b ei ng tested will p roduce some va r iatio n i n t he calibrated
output am p litude at h ig h er frequencies .
R EV . Β , OCT
1977
Open-Circuit O p eratio n
Capacitive
Loads
Operating Inst r uct i ons-SG 503
Coaxial ca b les of lesser quality or cab les t h at are lo n ger
or sh orter t han P art N um b er 012-0482-00 can be used, b ut
t h eo u tp u t am p lit
ud e
flatness
specifications are no longer
ap p lica b le . Cables t h at are 2 feet longer
or
2
feet sh orter
t h a n P art Nu m b er 012-0482-00 can
cause am
p
litude
variations t h at are as muc h as 4 ο / ο low or 2 ο/ο h ig h
(respectively) w hen compared to t he calibrate d
amplitudes
at 250 mega h ertz .
O p timum p erfor m ance is obtained w hen t h e setting of
t h e OUTPUT A MPL IT UD E con trol is i n t h e 1 .0 to 5 .0
ra n ge . F or exam p le ; w h e n an out p ut am p litude of 0 .5 volt
pea k -to-pea k is desire d , set OUTPUT A MPL IT UDE co n -
trol
to 5 .0 an d
A MPL IT
UD
E MUL T I PL I ER switc h
to
Χ .1
i n stea d of 0 .5 and Χ 1 .
Th
e si
n
e-wave o u
tp u t from the
SG
503 may b e applie d
to
an
exter n al d o level t h at d oes not excee d 11 volt . At
h ig h er do offset levels, couple t h e output t hroug h α do
b loc k ing capacitor . Wh en operating t he SG 503 always
co n si d er t he total loa d impe d ance an d its effect on t he
output am p lit ude .
Wh
en t h e SG 503 is operating into an im p edance muc h
greater t han 50
o hms, up to twice t he maxim u m ter-
minated output amplitude
can be obtai ned . Und er o pen -
circ u it con d itio n s, t he
actual
outp
ut am
p
litu d e will be two
times t he amplitude i n dicate d by t he fro
n t panel controls .
O p e n -circ u it amplitu d e flatness is not specifie d , but is
ade quate for ma ny applications in t he lower fre q uency
b an d s b ecause t h e stea dy state 50-oh m outp ut i m p eda nce
of t h e SG 503 reverse-terminates t he ch aracteristic im-
ped a nce of α50-oh m coaxial ca b le . T he reverse termina-
tio n keeps t h e out pu t amplitu de constant at t he unter-
minate d e nd of t heca b le even t h oug h stan d ing waves may
exist i n t he coaxial ca b le .
T he in p ut ca p acita nce of t he eq uipme n t u n der test will
affect t he ba nd width . T he equivalent circuitsshown
i
n
Fig .
1-4 Β and F ig . 1-4C are useful i n estimati n g t he am
p
litude
ch anges cause d b y r eactive loa ds . N ote t h at as system
i npu t
cap acita
nce i n
creases,
ban dwidt h d ecreases . T he
b andwid t h
of an
oscilloscope wit hαh ig h i nput im p eda nce
is usually sp ecified usi n g an eq uivale n t 25-oh m source .
Wh en o p erati ng t h e SG 503 on t h e h ig h er fre q uency
b
ands
wit h
no outp ut
attenuation, t he fro n t- pa n el d is p lay
may flas h , i nd icati ng an u n levele d out p ut amplitude .
Switc h the A MPL IT U DE MUL TI PL I ER control to t he Χ .1
p ositio n and if t he dis p lay flas h i ng ceases, t he p roblem
may be related to an extreme mismatc h b etwee n t
he
SG 503 a
nd t he
load .
If t he
SG 503 is op
erati ng i n to αh ig h
S WR, α 3-decibel atte nuator inserted betwee n t he outp ut
and t h e load may im p rove t h e o p eratio n at full ou tput
amplitude ( Χ 1 p ositio n of t h e A MPL IT U DE MULTIPLIER
switc h ) .

Operating
I n st r uctio n s--- S G 503
(A) Matched system
(C) Capacitive load
500
AAN-S-----( :~

PN 012-0482-00
I

-- --------- -
25 Q
-AV\IV---
ι
V g %
c qj )
V
c
50 Q

I
W----,a

PN 012-0482-00
(B)
Oscilloscope with high input impedance
50 Q
FEEDTHROUGH
TERMINATION
vv - \

TV"
VC
F ig . 14 . Equivalent circuits for SG 503, 50 ohm coaxial cable and various terminations .
OSCILLOSCOPE
W IT H 50 0
INPUT
IMPEDANCE
co - 3 dB cutoff frequency
2xRC
162004
REV . E, OCT
1977

P erfor m ance Co n ditions
C ha r acteristics
Fr equen cy
R a n ge
Accuracy
Am p
litude
R ange
Accuracy
REV . Β , oc - Γ
197 7
'The electrical ch aracteristics are vali d only if t he
SG 503 h as been calib r ate d at an ambient tem p erature
betwee n -i 20° C and +30° C an d is
operating
at an
ambie n t
tem pe r ature between 0°C and +50°C un less ot h erwise
n oted .
T he SG 503 is
calibrated for u se wit hα fur n is hed
coaxial cable accessory (See Stan
d ard Accessories i n
R ep laceable M echa n ical P arts list section) terminated i n to
α50-oh m loa d .
C
Ι
F Ι CΑT
Ι
Table
2-1
Ν
E LE CT R ICA L C H A R ACTERISTICS
P erfo r mance
Req ui r
e
m ents
250 kH z to 250 MH z, p lus 50 kH z refere nce
W it h i n -i-0 .7 of o ne cou n t of t h e least
sig
n
ifica
n
t dis played digit fo rt h e i n-
d icate d fre q ue ncy .
5 m V to 5 .5 V peak -to-pea k over t h ree
d ecade r an ges a nd terminated into α
50- Ω load .
At 50 kH z reference frequency ; wit h i n
3 ο / ο of indicate d amplitud e on Χ 1 ra n ge,
4 ο / ο on Χ .1 range, and 5 ο/ ο on Χ .01 ra n ge .
ΝΟΤΕ
Items listed i n t h e P erforma n ce
R
eq
uireme n ts column
of t he E lect r ical C h aracteristics are
verifie d by completi ng
t he P erforma n ce C heck i n t h is
manual . Items liste d in t he
S u ppleme n tal
I n
for
m
atio
n column are not verified in t h is
man u
al
; t hey are eit h er exp la n atory notes or performance
ch
aracteristics for w h ic h no limits are sp ecifie d .
Supp
leme n tal Information
Section 2----SG 503
Accuracy must be set to wit h i n 0 .3 ο/ο
on Χ 1 ra nge and ch ec k ed to be wit h i
n
2 . Οο /ο on Χ .1 a n dΧ .01 ra n ges .
F latness ( Peak -to- P ea k ) valid only w h en p r ecision coaxial cable is use d . F latness referenced to NB S
corrections of Tektronix stan d a r d s . N BS uncertainties not included .

Sp ecificatio
n an d P erformance C h ec k --SG 503
C h a r acteristics
Flatness ( P ea k -to-Pea k )
Am p lit ud e M ultiplier
Setti ng : Χ 1, Χ .1, Χ .01
Amplitude M ulti p lier
Setti ng : Χ 1
Am p litu de Mu ltiplier
Setti ng : X .1 and X .01
H a r mo n ic Co n tent
Altitude
O p erati ng
-40'C to 4-75'C .
V ibratio n
Operating an d Non-
operating
Sh oc k
O p erati ng a n d Non-
operating
2-2
ELE CTRICA L C H A R ACTERISTICS
ηΟ
Performance
R equirements
F rom 250 kH
z
to 50 MHz out p ut
amplit
ud
e
will n ot vary more t han 1 ο/ ο of
t he value
at 50 kH z .
F rom
100 MHz to
250 MH z am p li-
tude
variation is wit h in 3 ο/ο of t he value
at 50 kH z .
50 MH z to 100 MH z ra n ge ; output
am p litude
will not
vary
more t ha n 1 ο / ο of t he value
at 50 kH z .
50 MHz to 100 MH z ra n ge ; output
amplitu d e
will n ot vary more t ha n -f 1 .5% and
--1 .0% of t
h
e
value at 50 kH z .
H armo n ic su pp ressio n relative to funda-
mental : Seco nd h armo n ic at least 35 d B
down . T h ird and all h ig h er h armo
n
ics at
least 40 dB d own
.
To 15,000 feet
maxim u m operati ng
tem p
erature d ecrease d by 1°C/1000 feet
from 5000 to
15000 feet .
W it h t he instr u ment com p lete a n d
op erati n g, vibration frequen cy swe p t
from 10 to 55 to 10 Hz at 1 mi nute p er
swee p . V ib r ate 15 mi
n
utes
in
eac
h
of
t he
t h ree ma j or axes at 0 .015
inc h total
d isplaceme n t . H old 10 mi n utes at any
ma j or resonance, or in non e, at 55 H z .
Total time, 75 mi n utes .
30 g's 1/2 sine,
11
ms
d uration, 3 sh oc k s
in eac h d irection along 3 ma j or axes, for
α total of 18 sh oc
ks .
Table 2-1 (cont)
Table 2-2
Su p p lemental I n formation
E NV I R O NMEN TA L C H A R ACTE R ISTICS
Τ `
Pe
r
fo
r
mance
Req ui r eme n ts

Suppleme
n tal Info r matio n
R S V .
C,
A PR . 197
8