Tektronix 576 - Page 75

General
S h orte d
P ower Sup p ly . Α malfunction in t he p ower su p
ply is
often ca u se d by one or more supplies being s h orte d to
ground . Table 4-8 in d icates
t
he states of
all t he p owe r su p -
p lies i n t he instrument w h en one of
t h em is s h orte d to
ground . Th is table does not give values
i n cases w hen mo r e
t h an one su p ply is s h orted to ground or
w hen one su pp ly is
s h orte d to anoth er supply . In th ese
cases,
t
he table o n ly
in d icates interrelations h i p s betwee n su pp lies . Table 4-9
gives resista n ce values of t he su pp lies to groun d as meas
u
re d
by α VOM . B e sure t he i nstrument is tur ne d off w hen
ma k ing t h ese measurements .
TA BLE 4-9
P owerSupp ly
R esistance C h ec k '
'
T ype 576 turned o ff .
2 RE ADO UT
ILLUM control f ul l y cl oc k w i se .
CO RRE CTI VE M AI N T EN A N C
E
Corrective maintenance co n sists of com p one
n
t re
p lace-
ment and instrument re
p air .
S p
ecial tec h ni q ues re q uire d to
re p lace com p onents i n t h is
instr
u
ment are given h ere .
TA BLE 4-8
Su pp ly V oltages Wh en One
Su pp ly is Sh orte d to Grou nd
Sup p
ly V oltages (Approximate)
M ainte n ance-Ty p e 576
Obtaining R ep lacement P arts
Standard
P arts . All electrical and mec h a n ical p art
replacements
for t he Ty pe 576 can be obtaine d t h roug h
your local Te
k tro n ix F ield Office or re p resentative . How-
ever, ma n y of t he stan d ar d elect r onic com p onents ca n be
obtaine d locally in less time
t h
an is require d to o r d er
t h em
f
r om Te k tro n ix, Inc . B
efore p
urc
h asi ng
o
r
or d
ering re p lace-
ment p arts, ch ec k t
he p arts
list for
value,
tolerance,
rating
a nd d esc r i p tion .
ΝΟΤΕ
Wh en selecting re placemen t
p
arts, it is impo
r ta n t
to
remem b er t h at t he ph ysical size and s hape of α com-
pone n t may affect its p erforman ce, p
articularly
at
t he
upp er fre q uency
limits of t he i nstrume n t . All re p lace-
ment p arts s h oul
d be di r ect re placemen ts un less it is
kn own t h at α
different com p o n ent will n ot ad ve r sely
affect instrument
p
erformance .
Sp ecial P arts . In add itio n to t he stan d ar d electro n ic
com po n ents, some
s p ecial p arts are used i n t he Ty p e 576 .
T h ese p arts are manufact u re d or selecte d byTe k tro
n ix,
I
n
c
.
t o meet s p ecific pe r forma n ce re q uirements, or are manufac-
ture d for Te k tronix, Inc . i n accor dance wit h o u r s p ecifica-
tions . E ac h s p ecial p art is in d icate d in t he elect r ical pa r ts
list b y
an
asteris k p r ece d ing t he p art num b er . M ost of t he
mec h anical p arts use d in t h is instrument h ave been manu-
facture d by Te k tronix, Inc . Order all s p ecial p arts directly
from
yo
ur local Te k tronix F iel d Office or representative .
O
r
d
e r
i
n
g
P
a
r
ts .
Wh en
or d
eri n g re placemen t p arts from
Te k
t r
onix,
Inc ., i n clu d e t he following i nformation .
1 .
I
nstrumen t Ty pe .
2 . I n str u ment Serial N umber .
3 . Α descri p tion of t he p art (if electrical, incl ude circuit
number) .
4 . Te
k tronix P art Nu m b er .
4- 9
Su pp ly
-75 -12 .5 +12 .5 +100 +225 -4kV +4 .5* +5 +15
-75
0 0 1 3 0 0 0 0 .5 1
-12
.5
-35 0 1 .5 3 0 0 1 1 1
+12 .5 -75 0 0 0 0 0 0 0 1 .5
+100 -75 -1 1 .5 0 0 0 0 0 0
+225 -75
-12 .5
5 8 0 0 2 3 6
-4 kV -75 -12 .5 5 8 0 0 2 3 6
4 .5* -75 -12 .5 +12 .5 +100 +225 -4 kV 0 +5 +15
+5 -75 -12 .5 +12 .5 +100 +225 -4 kV +4 .5 0 +15
+ 15 -75 -12 .5
+12
.5 +100 +225 -4 kV +4 .5 Ι
+
5 ! 0
Su pp ly
V
O
M Scale R esistance
L
ea
d s + L eads -
-75 1 k Ω 1 .5 k 1 .9 k
+100
1 k Ω 5 k 1 .8 k
+15
1 1< Ω 23 k 2 k
+225
1
1<
Ω 36 k 12 k
-12 .5 10 Ω 252
352
+12 .5 10 Ω 16Q
31 Ω
+5 102 28Q 902
+4
.5 2
102 35 Ω 1002