Tektronix 576 - Preliminary Procedure Overview

ment of t h
e
Ty p
e
576
internal controls wit hout α com p lete
performance
ch ec k , or (3)
α
com p lete recalib r ation of t he
Ty pe 576, w h ic h inclu d es a d j
ustme
n t of
internal controls as
well as α com p lete p erformance ch ec k . To
perform
any
of t he
above ope r ations, use one of t h e following
met h
ods
:
P e r formance C hec k O n ly . Start wit h t he PRELIM I NARY
PR OC E D URE Performance C h ec k Only and p erform only
t hose ste p s wit h titles starting wit h t h e wor d Ch ec k , t h roug h
t h
e
main
proce
d
ure and t he Performance C h ec k an d Calib r a-
tion R ecor d .
Ad j ustment Only . Start with t h
e PREL I M I N A R Y PR O-
C E D URF -Calibration an d p erform
only t h ose ste p s wit h
titles starting wit h t he wor d Ad j ust,
t h roug h out t he main
p roce d ure and t he Perfo r mance C h
ec
k and Calibration R
ec-
or d . T he part of an a d j ust ste p involving t
he
actual a d ju
st-
ment is printe d in re d .
Cali b ratio n . Start wit h t he PREL I M I N A R Y PR OC
E-
D UR Ε -Calibration and p
erform
all
t he ste p s t h ro u g h ou t t he
main proce d ure or t h
e
Calibration an d
Performance C h ec k
R eco r d .
Wh en doi ng α com p lete calib r atio n o
r
α
complete a d j ust-
ment of i n ternal controls of t h
e
instr
ument, t he best overall
pe r f ormance will be
obtaine d if each a d j ustment is made to
t he exact setting,
eve n if t he observe d performance is wit h in
tolerance . Wh en
doing
only α
partial ad j ustme n t, howeve r , do
not rea d j ust any controls unless t he
observe d pe r formance is
not wit h in tolerance . Ι η eit h er case, do
not p reset any a d j ust-
ments unless t hey are k nown to be
significantly out of
ad ju stment or u nless re p airs have
been ma d e in t he circuit . In
t h ese instances, set t h ep articular
controls to mid range .
Α
picture of t h e Ty p e 576and t h
ee q
u
i p ment require d to
calibrate it or ch ec k its pe r formance is given
in F ig . 51 .
F ollowing t h is p ictu r e is α com p
lete list of initial control
settings for t he Type 576 and
significant control settings of
t he test i n struments . Pa r tial
lists of i n itial control settingsare
also provi de d at vario u s places in
t he main bo d y of t he text .
Any control setting not liste d in
one of t h ese partial lists can
be assume d to be set to t he p osition as
designate d at t he
beginni n g of t he p rocedure . T h ese control
settings can be
use d no matter w h ic h of t he t h ree p roce d ures is to
be use d . If
ad j ustments an d /or ch ec k s are ma d e without
followi ng one
of t he t h
ree proce d u r es, start with t he list of control settings
precee d ing t he d esire d ad j ustment or
ch ec k and follow t he
se q
uence
up
to t he d esire d ste p , ma k ing ch anges in control
settings as in d icate d .
PREL I M I N A RY PR OC E D URE
P erformance C h ec k Only
P erformance C h ec k /Cali br ation-Type 576
1 .

Set t h e L ine V oltage Selector assembly switc h es a nd
t h e 60 H z-50 Hz switc h on t he Ty p e 576 rear panel in ac-
cordance
with t he line voltage source to be use d .
2 . Connect t
he
Ty p
e 576
to t
h e line voltage source .
3 . R emove t he Stan d ar d Test
F
ixture from t
he
Ty p
e
576
an
d install t h e Calibration F ixture (Tek tronix P art Νο .
067-0599-00) in t he Ty p
e
576
.
4 . Turn on t
he Ty p e 576
. Allow at
least 5 minuteswarm-
υρ at an ambient
tem p e
r ature
between 0° C
an
d +50 ° C
(+32 0 F and +122 °
F)
before ma k ing
any
c
h eck s .
5 . Set t he con trols as s h own at t h e beginning of t h e
procedure and start t he performan ce ch ec k proced ure wit h
ste p 5 .
Calibration
1 . R emove t he side panels and t
he
Stan
d ar d Test F ixture
from t he Ty p
e
576 .
2 .

Set t h e L
ine
V
oltage
Selector
assembly switc h es and
t he 60 H z-50 H z switc h on t he Ty pe 576 rea r p anel in ac-
corda n ce wit h t he li ne voltage source to be used .
3 . Connect t h
e
autotransformer
and ot h er test instr u -
ments to α suitable
p
ower
source Connect t he Ty pe 576 to
t he autotransforme r ou t p ut .
4 . Set t he
autotransformer for t he li ne voltage and range
c
h ose n
on
t he Ty pe 576 L ine V oltage Selector assembly .
5 . Turn on t
h e autotransformer, t he Ty p e 576 a nd t he
test oscillosco pe . Allow at
least 5 minutes warmu p at
an
ambient tem p erature of +25 0 C ±5 ° C (+77
° F
±9
) F ) before
ma k ing any c h ec k s or ad j ustments .
6 . Connect t he 1 Χ probe to ve r tical in p ut Α of t
he test
oscilloscope .
7 . Set t he instrument controls as s h own at t
he beginning
of t he p roce d ure a
nd sta r t t he ad ju stme n t an d calibration
p roce du re wit h ste
p
1 .