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

Overall Dime n sions (measured at maximum points)
H eig h t
W idt h
Len gt h
N et W eig
h
t (I
n
stru
m en t
Only)
Introductio n
C ha
r
acte
r istics
Με 4 Ν C CHECK
Th is procedure checks t h e electrical ch aracteristics of
t
he
SG 503 t
h
at a p pear i n t he Specification section of t h is
ma n ual . If t he instrumen t fails to meet t h e re q uireme n ts
give n i n t h is p erforma nce chec k , t h e calibration
proced ure s h oul d be p erforme d . T h is procedurecan also
be used by an i n comi ng i n s p ection facility to d etermine
acce p tability of p erforma n ce .
The electrical c h aracteristics in Section 2 arevali d
only
if t h e SG 503 is calibrated at an ambie n t temperat u re of
+20° C to -+30° C and operated at an am b ient temperat u re
of 0°C to -+50°C . F orced air circulation is re q uire d for
ambient tem
p
erature above
4_40°
C .
REV . Β , OCT 197 7
Specificatio n a nd P erfor m ance C h ec k ----SG 503
Table 2-3
PH
YSICAL CHA R ACTE R ISTICS
5 .0
i nches
12 .7 cen timeter
2 .6 inc hes
6 .6 cen timeter
12 .2 i nches
Test Eq u ip m e n t R equired
Tole r ances t h at aresp ecifie d i nt h is performa n ce check
p
roced ure apply to t h e i n strument under test a n d do n ot
i n cl u
de test e q ui
p
me n t error .
T h e
test eq ui p me n t listed i n Table 2-4, or e q uivalent, is
re qu ired
to p
erform t hepe
r forma nce c h eck . Test eq u ip-
ment ch aracte r istics listed are t h e min imum require d
to
verify t he p erforma nce of t h e equipment under test .
Substitute equip
me n t must meet or excee d t he state d
re qu ireme n
ts
.
All test eq ui p me n t is assume d to be
operati n g wit h i n
tole r ance .
S p ecial test d evices are use d wh ere necessary to
facilitate t h e procedure . M ost of t hese are available from
Te k tro n ix, I nc . an d can be ordered t hroug h your local
Te k tronix F ield Office or representative .
2-3

Specification and Performance Check . --SG 503
Oscilloscope

Banclv~icltlh, dc to 100 MHz ;
minimum deflection factor,
1 mV/div ; sweep rate,
accuracy, within 3% .
Digital Voltmeter

I Range, 0 to 50 V ; accuracy,
Calibration Generator

Amplitude
calibration, 5 mV
to 5 V ; accuracy, ±0 .25%
into 1 MO ; output, square
wave at approximately 1 kHz .
Spectrum Analyzer
Peak-to-Pealk Detector
Coaxial cable
Patch cord (2 required)
Coaxial cable (2 required)
Α uonu ο t
o
r,
2X
Performance
Description

Requirements
(2
required) .
Tee connector
Adapter
Termination
Resistor
'Requires TM 500-Series P ower Module .
2-4
T a W e 2 -4
UST OFTEST EQUIPMENTREQUIREMENTS
R ο ngo .100kHzo σδ 00 MHz ;
calibrated levels in decade
steps from -45 dB
to -35 dB ;
impedance, 50D ; accuracy,
linear display, within 1 0% .
Frequency
range, 50 Hz to
500 MHz ; requires 1 .
2Vp-p
input voltage .
----------
Impedance, 50 Ω ; length,
36 inches ; connectors, bn ε ;
(precision coaxial cable) .
-

-- -- ----- ------
Β n ε to banana
p!ug
-j a ε k
.
18 inch .
42 inches ; connectors,
bn ε .
Impedance, 50Q ; ε on-
GR to bnc female .
Impedance, 50D ; con-
nectors, bn ε .
___
Application
Used throughout proced-
ure t o provide display .
Provides signal intercon-
nection .
---------
---- --------

---------
Example
TEKTRONIX
7603, 7A1 3, 71370
Oscilloscope System .
TEKTRONIX DM
501 Digital
K η uhimo te ι
"
Τ EK Τ RO Ν !X Τ K4503or Τ K η 504 .
TEKTRONIX PG 506 Calibration
Generator .'
TEKTRONIX 71-12 Spectrum
Analyzer .
Tektronix 067-0625-00
Calibration Fixture .
Tektronix Part No . 012'048 2 -00
(supplied with SG 503) .
Tektronix Part No .
0 12 00 90-00 (b!u ε
k)
0 12-0091-00(md)
- - ----- --- ---- - ~
Tektronix Part No .012-0057-01 .
Tektronix Part No . 011-0069-02 .
Tektronix Part No . 103-0030'U0
.
_____________
Τ *WnonixPa~ Ν o~017-0083-00 .
Tektronix Part No
. 011'0040-01 .
Tektronix
Part No . 801-0 2 45-00 .
REV . C, APR . 197 8

P reliminary P rocedure
1 . E nsure that all power switches are
off .
2 . Ensure that all test equipment an d t he SG 503 under
test are suitably a d a p ted to the line voltage to be applie d .
3 . Install the SG 503 into the p ower
module, and if
applicable,
install all other
TM
500-series test equipment
into the power module .
4 . Connect the equi p
ment under test and the test
equipment to α suitable line voltage source . T urn all
equipment on and allow at least 20 minutes for the
equipment to warm up and stabilize .
Initial Control Settings
Set the following controls d uring warm-up time :
AMPLITUDE MULTIPLIER

Χ
1
FR E QUENCY V ARIABLE

M idrange
FREQUENCY R ANGE (MHz)

R EF
-
.05
OUTPUT AMPLITUDE

5 .0
Intensity, F ocus

Set for well-defined trace
and normal brightness .
V olts/Div
V ariable
+ Input
--Input
B andwidth Limit
Time/Div
V ariable
Triggering
-t -Slope
M o d e
Coupling
Source
P osition
REV .
Β , OCT 197 7
SG 503
Oscilloscope
Differential Comparator
Time
B
ase Plug-in
.1 V
fully clockwise (cal)
ac
ac
5 MHz
.2 ms
(cal in)
selected
Ρ - Ρ Auto
ac h
f r
ej
Ext
Set so trace starts at left
si d e of graticule .
M agnifier

Χ 1
P E RF
Specification
and P erfor m a n ce Check---SG 503
R ί VIANC
E CHEC
K PROCEDURE
ΝΟΤΕ
The SG 503 m u st be terminated into anaccu
r ate 50-
o h m load
fo r
all
c h ec k s . M easure t h e 50-oh m
termination
to determine p ercent of error . Α 2 ο/ ο error
in t he termination (1 oh m) will cause amplitude
e r rors of 1 ο/ο . F or exam p le, α51-o h m termination
ca u ses an amplitude erro
r t
h at is
1 ο/ο h ig h at 50
k ilo h ertz .
1 . Check Reference Amplitude
Accuracy at 0 .05
megahertz .
α .
Connect
a 1 k ilohertz, 5 volt square-wave
signal from
the calibration generator, through α bnc
tee connector, to
the -i- input of the differential
comparator, using α 42-inch
cable . Connect α 42-inch cable
from the tee connector to
the time-base unit
external trigger input .
b . Connect the precision 50-ohm cable (supplie
d with
SG 503) to the SG 503 OUTPUT connector
.
c . Connect α
50-ohm termination to the remaining end
of the p recision 50-ohm cable ; connect the
other end of
the 50-ohm termination to the --- input of
the d ifferential
com p arator .
d . Set t h e time-base triggering controls for
α stable
display ; α crt d isplay similar to F ig
.
2-1 is
obtained .
e . Chec k ---that the corners
of the idealized waveform
are aligned as
illustrated in F ig . 2-1, within 1 .5 vertical
divisions . Disregard waveform tilt .
F
ig .
2-1
. R epresentation
of
complex waveform (idealized) with 5
volt reference amplitude at 0 .05 MHz,
properly set .
2-5

S p
ecification
an dP e
r
fo
r m
a
n
ce C
h
eck --SG 503
f . Set t he
SG 503 OU TP UT A MPL IT U DE co n trol to 0 .5 ;
set t he calibratio n generator for
α0 .5 volt,
1
k ilo h ertz
s q uare-wave signal .
g . Set t h e differe n tial-com p arator d eflection
factor for
10 m V /div .
h .
C heck ---t h at t h e waveform is similar as ill u strate d i n
Fig . 2-2, (wit h in 1 .5 vertical divisio n s) .
i . Disco nnect all ca b les .
F ig . 2-2
. Display of com p lex waveform (idealized) wit h 0 .5 volt
r efere n ce am p
litu
de
of 0 .05 MHz, pr o p erly set .
2 . C h ec k H ar m
on
ic
Su
pp
ression and L eveling
α . Co nn ect t h e SG 503 outp u t to t h espectru m
a
n
al
yz er
input, usi ng t he p recision 50-oh m cable (sup p lie d wit h
SG 503) .
b . Set t h e SG 503 O UT P UT A MPL IT U DE control
to 5 .5
and
t h e A MPL IT U DE MUL TI PL IER switc h
to
t he Χ 1
p ositio
n .
c . Set t h e SG 503 FR EQ UEN CY R ANG E (MHz) switch
to
t he
100-250 ra n ge .
d . P
ositio n t h e fu n da m ental dis p lay
to t
he
to p
graticule line wit h t he
spectrum analyzer position con trol .
See Fig . 2-3 for refere n
ce .
2-6
Fig . 2-3
.
Dis
p lay of 100 MH z sig n al a nd ha r mo n
ics .
NO Ϊ
'
Ε
It will be necessary
to c
h
ange t h e spectrum an alyzer
input attenuation
(sensitivity) to maintain a
reasonable display
on
screen,
wit h harmonics above
t h e
baseline noise level and
within
t he
g
r
at ί cule area .
e
.
Slowly a dju st t he SG 503 F RE Q UEN
CY
VAR
IA BLE
control
over its en tire ra nge an d check t h at t he
vertical
dista n ce
(su pp ression) between t h e to p of t he fu n
dame n -
tal and seco n
d
h
armo n ic display is at least 3 .5 divisio ns
;
t he to ps of t he remaining
h armo n ics are separated at least
4 .0 d ivisio ns
. (Ad j ust t he s p ectr u m analyzer F re q ue ncy
Span/Div control
as necessary to main tai n t he h armonic
d isplay on scree n .)
See Fig . 2-3 .
f . Set t he
SG 503 F REQ U E N CY R A N G E ( MH z) switc
h
to t h e 50-100 range .
g . R epeat part
e of t h is ste p for t he remaining
frequency
ra n ges, usi ng Table
2-5 as reference . (Supp ressio n limit of
45 decibels down
corres po nd s to 4 .5 d ivisions
on t
he
dis p
lay .)
ΝΟΤΕ
All coil a dj ustments h
ave been a dj usted fo r
mi ηί
mum harmonic
amplitude at t h e h ig h end of t he
associated
r a n ge (wo r st case h armonic
conditions) .
C h eck th
at
t
h e outp u t remains levele d
(display will
blink if
unlevele d condition occurs) as t h e
SG 503
FREQ UEN CY V AR
IA BLE control is slowly rotate
d
over
its associate d f r eque n
cy range .
REV . Α , A PR . 197
8

SG 503
FREQU E NCY
(RANGE (MHz)
100-250
50-100
25-50
10-25
5-10
2 .5-5
1-2 .5
_
.25- .5
R EF~ .05
REV . Α , A PR . 1978
Table
2-5
SG
503__
_

__
FR E Q U E N CY
V ARIABLE
Typical
Displayed
Count (Frequency
97 .5-260
.240-_ .5_20
_ .
., Ο
49- .051
vary slightly
b etween instruments .
Typical H
armonic
Suppression
(2nd and all
h igher harmonics,
relative to
fund amental)
>,40 dB down
,>
40 dB d own
. . ._
:
._
_- >40 dB dowc
-_ .
,>45
dB
down
>-45
dBdown
_>45 dBdown
>45 dB down
_>45 dBdown
_>45 dBdown ~
__ ._ ._~45
- dBdown - ._~-
'The minimum and
maximum displayed count on each range will
h . Disconnect the cable from the spectrum analyzer .
3 . Check F latness (Peak-to-Peak
A m plitude
R egulation)
α
.
Set the SG
503 controls as follows : FREQUENCY
R ANGE (MHz) switch to REF
-
.05 position, and t he
AMPLITUDE MULTIPLI E R switch to Χ 1 .
b . Connect α2 .4 megohm, 5 ο / ο resistor across the
digital
voltmeter floating input terminals .
Connect the SG 503 via
b nc
female-to-GR a dapte r to the input of the peak-to-peak
detector . U se two bnc to banana-plug-jack patch cords to
connect the output of the p eak-to-peak
detector
to
the
floating input terminals on the digital voltmeter ;
maintain
correct polarity, HI to + and LO to - .
Set the d igital
voltmeter to
the 20 volts do range .
c . Slowly adjust the SG 503 OUTPUT
AMPLITUDE
V OLTS Ρ - Ρ control
until the digital voltmeter display
indicates χ _ .000 . Output amplitude from the SG 503
should be about 1 .1 to 1 .2 volts ; this
establishes α Ο . Οο / ο
reference setting at .050 megahertz
.
d . Slowly adjust the SG 503 FREQUENCY
V ARIABLE
control over its entire range at each of
the frequency range
positions
of
the FREQUENCY R ANGE (MHz) switch .
S
pecification and Performance Check-SG 503
e . Check-the flatness d eviation from 0 .25
megahertz
to 50 megahertz, must be
within 1ο/ ο
of
the value at .050
megahertz . The total
percentage deviation calculation
must
includethe digital voltmeter reading andthe calibra
tionfactor of th e p ea k -to-pea k d etector . F or
example, α
reading of -χ- .008 volt on the d igital
voltmeter is equivalent
to +0 .8 ο/ο deviation .
Ap p lying α correction factor of -0 .3 ο/ ο
results in α total
p ercentage deviation of 40 .5 ο/ο .
f . Check--the flatness d eviation from 50 megahertz to
100 megahertz, must be within 1 ο/ο of the value at .050
megahertz . The same calculation must be considered
for
this d eviation reading as described in part
e of this step .
ΝΟΤΕ
Α 1 ο/ο total p ercentage d eviation
ensures f latness
specification w h en t h e SG 503 is
operating at the X . 1
and Χ .01 A MPL ITU D E MUL TI PL I
ER switc h
positions .
g . Check----the flatness deviation fro m 100 megahertz
to 250 megahert z , must be within 3 ο/ο of the value at .050
megahertz . The same calculation must be considered for
this d eviation reading as d escribed
in part e and f of this
step .
h .
To
check t he flatness d eviation at α h igher voltage
output from the SG 503, insert two 2
Χ attenuators between
the SG 503 cable and t he p eak-to- p eak
detector . R epeat
p art c of this step to obtain another0
.0% reference reading
of about 4 .7 volts outp ut
from the SG 503 .
i .

After obtaining the new Ο . Οο /ο reference
indication
on
the digital voltmeter, r epeat p arts e and
f
of
this step to
check flatness d eviation for about 4 .7
volts output from the
SG 503 . Tolerance limits are the same
as in parts e an d f of
this step .
j . Disconnect all cables
fro m t he SG 503 .
This completes the P
erformance Check procedure
of
the SG 503 L eveled Sine
W ave Generator .
2-7

I n t r od uction
T
h is ad ju stme n t proce dure is to be
used to restore t he
SG 503 to
origi n al p erforma nce sp
ecifications . A dj ust-
me n t nee
d notb e p erfo r me dunless
t he instrume n t fails to
meet t he P erforma nce
R
eq
uireme n ts of t h e Electrical
C h a r acte r istics listed
i n t heS p ecification
section, or t he
P e r formance
C h ec k ca nn ot be com p lete d
satisfactorily .
Com p letion of all ad j
ustme n t ste ps in t h is proce
d ure
e nsu r es t h at
t he i n str u me n t will meet
t
h e
performa nce
re q uireme
n ts liste d i n t h e Specification section
. H owever,
to fully ensure
satisfacto r y performance,
it is recommend-
e d t
h at t he P erforma n ce C hec k be
perfor m ed after any
a dj ustment is made .
Services Available
Te k tro n ix, I nc . p
rovides co m p lete i n str
u me n t re p air
a nd ad j ustme
n t at local F iel d Service
Centers a nd at t he
F acto r yService
Cente r . Contact your
local Te k tro n ix F ield
Office or re p resentative for furt
h er informatio n .
Desc
r i p tion
Oscillosco pe
Digital V oltmeter
P owe r M o d ule
_
Calibration Ge n erator
Spectru m Analyzer
P e r forma n ce
B a ndwid t h , dc to 100
MHz ;
minimum d eflection factor,
1 m V / d iv ; sweep rate,
10 ms/ d iv to 1 μ s/div ;
acc u racy, ωι t h 1 η 3% ο .
A
mp litu d e calibration,
50
mV
to
5 V ; accuracy,
±0 .25% i n to 1 ΜΩ ; out
put, square wave at a pprox-
imately 1 kH z .
R an ge, 100 kH z to 300
MH z ;
calibrate d levels i n deca
d e
steps from --45 db
to
-35 db ; im p edance,
50
Ω ;
acc
u racy, li near
___ . ._ . . . . . . :

__display, within 10% ο . ;
' Re qu ires TM 500-Se
r ies P owe r M o du le .
REV
.
C,
ΜΑΥ , 197 8
Ta b le 3-1
Test
E qui p m ent R eq uired
T he test e q ui p me n t listed
in Ta b le 3-1, or eq uivalent, is
require d fo r a dj
ustment of t h e SG 503 . Sp ecifications
given
for t he test equi p ment are t h e minim u
m necessary
for acc u rate a dj ustment and meas
u reme n t . All test e qu i p-
ment is assume d to be cor r
ectly cali b rate d and op erati ng
wit h in specificatio n
.
If ot h er
test eq ui p me n t is substituted, co
n trol settings
or calibration setu p may n eed to be
altere d to meet t h e
re qu irements of t h ee qu i p ment
used .
Α flexible plug-in
exte n der, Te k tronix P art No .
067-
0645-02,
is useful for tro u bles h ooti ng or ad ju
sting t he
SG
503 ; however, t he complete A d j ustment
P roced u re
can be
performe d wit h ou t use of t he exten
d er .
L IST OF TEST E Q U
I PMEN T R E QU I R E M EN TS
Sectio n
3-SG 503
t Used throughout proced
-

ΤΕΚΤ R ΟΝΙΧ 7603, 7A1 3, 71370
ure to p
rovi d e d isplay .

Ι Oscillosco pe System
.
V oltage meas
u re ι n e n ts .

TEKTRONIX D M 501 Digital
Output
voltage flat n ess

M ultimeter .'
check .
^ ΑΙ Ι tests .

TEKTRONIX TM 503 ο r ΤΜ 504 .
Am p litu de Set ch ec
k
an
d TEKTRONIX P G 506 Cali b ratio n
ad ju stme
n
t .

~
Ge n erator .'
Bu ffer Distortion, H armo η - TEKTRONIX
71-12 Spectru m
is Supp ressio n ch eck .

~
A n alyzer .

A dj ustme n t--SG
503
Description
Peak-to-Peak Detector
Autotran sformer wit h
ac voltmeter
Coaxial cable
P atc h cord (2 re q uire d )
Coaxial cable
(2 re qu ired)
Atte n uator, 2 Χ
(2 re
q uire d )
Tee con nector
Ada p
ter
Termi n atio n
R esistor
Screwdriver
Alig n me n t tool
Alignme n t tool
3-2
LIST OF TEST
EQ U IP M E N T R E QU I R E M EN TS
P erfo r mance
R
equire m e n ts
F
requency r an ge, 50 Hz to
500
MHz ; re q uires 1 .2 V ρ - ρ
input voltage .
Im peda n ce, 50 Ω ; le n gt h ,
36 inc h es ; connectors, bnc ;
( p recisio n coaxial cable) .
Bnc
to bana n a- p lug- j ac k ,
18 i nch
.
Imp eda n ce, 50 Ω ; le n gt h ,
42 i n c hes ; connectors, bnc .
Im ped
a n ce, 50 Ω ; co n -
n ectors, bnc .
Co nn ectors, b n c .
G R to bnc fe m ale .
Im p edance, 50 Ω co n -
n ectors, b n c .
F ixed, 2 .4 ΜΩ , 1/2 W, 5 ο/ο .
T h ree-inc hsh
aft, 3/32 inc h
b it .
F its 5/64-inc h (ID) h ex
cores .
F ive-i
n c h , for slotte d cores .
Table 3-1 (cont)
A p plication
O u tput voltage
flat ness
check .
Capable of su p p lyi ng an o u t-
put voltage from 90 to 132 V,
ac ;
120 watts
of
p
ower at t he
u pper limit .
P
ower su pp ly check .
P rovides sig n al intercon-
n ectio n .
P rovi des signal i n tercon-
n ectio n .
R eference
amplitude
ch ec k .
- -- ----- --------- --
Out p ut voltage flatness
------ - - - ----
Out p
ut voltage flatness
U se d to a dju st coils i n
h
armo n ic s up pressio n
check .
------ ------
U sed
to ad j ust coils i n
h ar m onic su pp
ressio n
E xam p le
Te k tronix 067-0625-00
Calibration F ixture .
Gene r al R adio W 10 M TR3 W
V ariac Autotran sformer .
Te k t r o n ix P art No . 012-0482-00
(su p plie d wit h SG 503) .
Te k tro n ix P art No .
012-0090-00 (blac k )
012-0091-00 (re d )
Te k tro
n
ix P art No . 011-0069-02 .
Te k tro n ix P art No .
103-0030-00 .
Te
kt r
o
n
ix
P
art No . 017-0063-00 .
Te k tronix P art
No . 01 1-0049-01 .
T ek tronix P art No . 301-0245-00 .
------ ------
----------- -
Xcelite R -3323 .
Te k tronix P art No .
003-0307-00
( h andle)
003-0310-00 (i n
sert)
REV . C,
OCT 197 7

Pr epa r ation
α . R emove t he left a nd rig h t
si
d e
covers of
t h e
SG 503 to
gai n access
to
t h e component
side of t
he
circuit boards .
Pull t he rear en d of t he si d e cover outward from t he side of
t he i n str u ment (t h e coversnaps into place) .
b . I n stall t h e SG 503 into t he left p ower m od ule
com
pa
r tme n t, or if a pp ro p riate, co nnect t he SG 503 to t h e
p ower mo d ule b y means
of
t h e flexi
b le plug-in exten d er
.
c . Set t h e power mod u le for t he li ne voltage
to
be
a p p lied (see p ower mo d ule ma n ual) and co nn ect it to t h e
varia b le autot r ansfo r mer ; connect t he autotra n sformer to
t h e line
voltage sou r ce . Be sure t h at t he p ower switc h is
off .
d . I n stall t he TM 500-series eq ui p ment, i n clu d i n g t h e
SG 503
into
t h e p ower mo d ule .
e . Co n nect all test eq ui p ment to α suitable li n e voltage
sou r ce .
f . 'Turn on
all
test eq ui p me n t and
allow at least
20
minutes for t he eq ui p ment
to
warm
up an d stabilize .
I n itial Control Settings
Set t he followi ng co n trols during warm-up time :
SG 503
AM PL IT U D E MUL TI PL I ER

Χ 1
FREQ U E N CY V A R IA BLE

M i d range
F R E QU E N CY R ANG E (MHz)

REF - .05
O U
T
PU
T A MPL IT
U
DE

5 .0
Oscillosco pe
Inte n sity, F ocus

Set fo r well-defined trace
an d n ormal brig h t ness .
Differe n tial
Comparator
V olts/ d iv

.1 V
V ariable

fully cloc k wise (cal)
+In pu t

ac
-Input

ac
B
an dwid t h L imit

5 MHz
Time Base Plug-in
Time/Div

.2 ms
V ariable

(cal i n )
Triggeri n g
-i-Slo pe

selected
M ode

Ρ - Ρ Auto
Cou p ling

ac h f re j
Source

E xt
P
ositio n Set so trace starts at left
side of
graticule .
M ag n ifier

Χ 1
The SG 503 must be
terminated into an accu
r
ate 50-
o h m loa d fo r all c h ec k s and adj ustme n ts . M easure
t h e 50-oh m termination to determine percent of
e rr o r . Α 2 ο/ο e rr o r in termination (1 o h m) will cause
am p litu d e e r rors of 1ο/ο . Fo r example, α 51-o h m
termination ca u ses an amplit u de e rr o r t h at is 1 ο /ο
high at 50 k ilo h ertz .
Ad ju stment--SG 503
ADJUSTMENT PROCEDUR
ΝΟΤΕ
71-12 Spectrum Analyzer
F re quen cy
Ce n ter selected
Coa r se
0000
F i n e midrange
10 dB / d iv selecte d
Triggering
Ρ - Ρ auto selected
F ree R un selected
L evel
midra n ge
Slope -i-
RF
d B 50 (on knob)
R efe r ence level
20
V ariable
CA
L (ccw)
Time/Div S PE CT RUM
V ariable i n
B ase L i ne Cli pp er ccw
H
oriz
P
os mi d ra n ge
V ideo F ilters
30
kH z
V i d eo Processor not selected
AutoPh ase L oc ked on (up)
F re qSpa n /Div 100 MHz
Hz
R
esolutio n 3 MHz (3M)
V aria b le
Cal
V e r t P os
midrange

Adjustment---SG
503
σ
υ
υ
1 . A d just - α -22 V olt Power Supply
e . Disconnect the d igital voltmeter .
υc υσυο
+5 .2 ν
T E
ST POINT
F _
α . Connect the digital voltmeter between the --22 V test
point on the M ain circuit board, and chassis ground . See
F ig . 3-1 for voltage test p oint
location
.
b . Check-for α meter reading of --22 volts, +50
millivolts .
c . Adjust--- ---22 V
adj,
R
694, for α meter r eading of ---22
volts .
See Fig . 3-1 for ad justme n t location
.
d . A d just the autotransformer output voltage from the
low limit to the h igh limit as indicated i n Table 3-2 . M eter
r eading should not vary more than ±-50 millivolts . R eturn
the autotransformer to the nominal line voltage setting .
-22 V
T EST POI NT
R 694
--22 V AD J
Fig . 3-1 . L ocation of test p oints, L 100, and -- β 2 volt
adjustment .
L

90 V ac to 110 Vac
Μ

99 V ac to 121 V ac
108 V ac to 132 V ac
Line F use
Data

1 .6 Α slow-blow
2 . Check +5 .2 V olt Supply
Table 3-2
c
01
3
-
Φ
=_ _=1
αΙ
Ι =
ΙΙ ΙΦ
-1
P OWER M ODULE UNIVERSAL T
RANSFOR M ER
Line

R
egulating R anges
Selector
Block
Position

110-Volts N ominal

220-Volts N ominal
180 V ac to 220 V
ac -
198 V ac to 242 V ac .
216 V ac t_ 0264 V ac
_
0 .8 A . slow-blow _ .-
α . Connect
the d igital voltmeter between t he +5 .2 V test
point on the M ain circuit
board, and c hassis ground . See
F ig .
3-1 for voltage test point location .
b . Check--for meter reading of -+5 .0 to +5 .4 volts
.