Keithley 153, Инструкция по эксплуатации, Страница: 25 / 51

MOD EL 1 5 3 Hl CROVOLT- AHHETER
S E CT I O N 5 . S E R V I C I N G
5 - 1 .
GENERA L .
S e c t i on 5 c o n t a i n s t h e md i n t e na n c e a n ll t r o u lJ 1 e s h o o l i n g p r o c e d u r e s f o r t h e
Mod e l 1 5 3 .
Fo l l o,,1
t h e s e
p r o c e d u r e s
a s c l o s e l y
a s p o s s i
b
l
e
t o ma i n t a i n t h e a c c u r a c y a n d
u s e f u l n e s s o f t h e i n s t r umen t .
5 - 2 . SERV I C I NG S C HEDULE .
The
Mod e l
1 5 3
n e e d s
l i t t l e
p
e
r
i
o d i c ma i n t e n a n c e b e y o n d t h e n o r ­
ma l c a r e r eq u i r ed o f h i g h - q u a l i t y e l e c t ron i c e q u i pm e n t .
N
o p a r t s h ou l d n e ed r e p l a c e m e n t
u n d e r o r d i n a r y u s e e xc e p t t h e b i a s b a t t e r i e s or , o c c a s i o n a l l y , a v a c u u m t ub e . T h e l i f e
o f t h e b i a s b a t t e r i e s i s a p p r o x i ma t e l y
two
y e a r s .
5 - 3 . PA RT S REPLACEMENT . The Rep l a c e a b l e Pa r t s L i s t i n
S e c t i on 8
d e s c r i b e s t h e e l e c t r i c a l
c omp on en t s
i n t h e
�10d e l
1 5 3 . Re p l a c e
c o
m
p o n e
n t
s
on l y a s
n
e
c e
s
s
a ry ;
u s e
on ly
r e l i ab l e r e ­
p l a c emen t s wh i c h me e t t h e s p e c i f i c a t i o n s . Re p l a c e
t h o s e
i t ems l i s t e d
f o r
Ke i t h l e y ma n u ­
f a c t u r e ( 80 1 64 ) on l y w i th c omponen t s s u p p l i e d
b y
Ke i t h l e y I n s t rume n t s , I n c . , o r i t s
r e p r e ­
s e n t a t ive .
Tub e V IO L
i s a g e d ; r e p l a c e o n l y w i t h a Ke i t h l e y p a r t .
5 - 4 . TROUBLESHOOT ING .
a . The
f o l l owing
p r o
c e d u
r e s a r e
f o r r e pa L r Lng t roubl e s wh i c h
migh t
o c c u r
in t he M
o
d
e l
1 5 3 .
Us e t h e s e procedures t o t r oub l e s h o o t and u s e on l y s p e c i f i e d r e p l a c emen t pa r t s . Ta b l e
2 l i s t s equipmen t r e c ommend ed for troub l e s h o o t ing .
I f
the
troub le
c a
nn
o
t b e
r e a d i l y l o ­
c a t ed o r r ep a ired , c on t a c t Ke i t
h
l ey I n s trume n t s , Inc " or i t s r e pr e s en t a t i ve .
b ,
Before proceeding with the troub leshoot ing , check
the vacuum t ub e s .
No rma l ly ,
r e ­
p lac ing
tub e s wi l l
c l ea r
u p t h e d i f f i cu l t y .
A l l
tub e s
can
b e
r
ea
d i
l y t es t ed o n a
g rid -
Rep laced
Tub e
VlO l
V 10 2
and
V 20 l
V I0 3
V 30 l and V30 2
Check for
no i s e
me t e r a ccura cy
s low
o r
s lugg i s h
s p ons e on
10 and
rang e s
m e t e r a c cura cy
c o rr e c t
b i a s
me t e r a c cura c y
c orre c t b ia s
z e ro
c en t er met e r
a c cura cy
re-
30-llv
Ad j us tment Paragraph
Re f e rence
rep la c e
tub e
-
me t e r a d j us tmen t
6-3
mu l t i vib r a t o r frequency
5- 6
a d j us tment
me t e r a d j us tmen t
6- 3
b i a s ad j us tment
5- 5
me t e r a d j u s tmen t
6- )
b ia s ad j us tment
5- 5
z ero c en t e r me t e r a d j us t -
6 -3
ment
TABLE
3 . Po s s ib l e Ad j u s tme n t s f o r Re p l a c e d Tub e s . Af t er a f a u l t y
tub e
i s r e p la c ed , t he
ab o v e ad j u s tmen t s migh t b e n e c e s s a ry . Re f er
to
p a ra g raph
5- 4 .
1 7