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S ERVICING
m o d u l a t e d
t ub e
t e s t e r f o r
t e s t a
b e s t wa y
t o
l
R e p
p r o c e d u r e s .
a
c
l
3
Re f e r t o
T
a b
e
f o r a d j u s t m e n t s wh i c h m i g h t b e n e c e s s a r y .
T a b l e 4
c o n t a i n s
c .
t h e
T a b l e d o n o t
c a t e d
i n
c U i t s .
S t a r t b y r e c h e c k i n g
+ 1 50
t
a n d - 1 3 v o l t s .
v
o l
s
,
s u p p l y .
w i t h i n
t h e p ow e r
Th t
d .
s c h e ma t i c
t
h
s
Fo r
p o i n t s .
e v a l u e s ,
e
s h or t e d .
Th e Mo d e l
MET ER S'\o) i
FUNCT I O N
RANGE Sw i t c h
Re f e r
t o
t h e c i r c u i t d e s c r i p t i o n
d e t e rm i n e t h e i r
f un c t i o n
10 .
F
F IGURE
Wave
o r
030 1 a n d 0 30 2
( F igure
is 1
h o r i z on t a l , 2 m s
v / cm;
Output i s app rox ima t e l y
5 - 5 .
BIA S ADJU STMENT .
ground b y
c onn e c t i ng p o i n t
MET ER
t o + ;
t he
Swi t c h
RI 2 5 ( F i g u r e 20) ,
t i ome t e r ,
a d j u s t for
g r o un d ;
e xa c t m e t e r z e ro .
5 - 6 .
MULT IV I B RATOR
t ub e s V I O L
a .
Rem o v e
u
u
o p e r a t i o n .
s
a l
t ub e .
I f r e p l a c i n g a
t u b e s
i
g
d o e
s
n o t
n e c e s s i t a t e
n
t h e mo r e c o mmo n
l
c
e
a
r u p t h e
p o w e r s u p p l y f o r p r o p e r o p e r a t i n g
e
t h
F i g u r e s 10
U s e
t h e O s c i l l o s c o p e
d i a g r a m 1 7 7 7 1 H ,
f o u n d
s
m e
a
u r e d w i t h t h e Mo d e l
1 5 3 c o n t r o l s
a r e s e t :
t c h
Swi t c h
i n S e c t i o n
i n t he
c i r cu i t .
m
D i o d e s
a t Jun c t i on o f
V e
l
r
c a
27 ) .
i
t
s e t t ing
c m .
/
+4 U U
vo l t s dc .
k
C
h e c
t h e mechan i c a l me t e r
( Figure 2 1)
T . p .
a n d
t h e FUNCTION Swi t c h t o
for
a z e r o
F REQUENCY
ADJU STMENT .
(
a n d
F
i
g
r
V I0 3
u
s ub s t i t u t i n g
How e v e r ,
t ub e d o e s n o t
c o r r e c t t h e t r o u b l e ,
c om p l e t e r e c a l i b r a t i o n o f
wh i c h
t r o u b l e s
m i g h t
t r o u b l e ,
ma k e
a p O i n t - b y - p o i n t
t o
1 2
s h ow
t y p i c a l
t o ob t a i n t h e p a t t e r n s .
i n S e c t i on
8 ,
c on t a i n s
6 1 0 B t o
+
VOLT S R- 2M
I VOLT
4
t h e m o r e
t o
f i n d
FIGURE 1 1 .
RJ0 2 ( Figure 27)
t or
( F igure 19) .
h o r i z o n t a l ,
Output i s ap p ro x ima t e l y
1 2
FIGURE
( Le f t ) .
V e r t i ca l s e t t i ng
Su p p l y .
h o r i z on t a l ,
.
e
z
r o
S h o r t
t o g r ound .
S e t
INPUT R- 2M.
e
r e a d i n g .
Re
t
r
m
o
e
m
2 D .
MET ER Swi t c h
e
Turn
t h e
1 8
1 5 3
MODEL
MI C ROV OLT - AMME T ER
t u b e s
kn own g o o d
c o n t i n u e
t h e
.
I f
o c c u r
t h e r e p a i r s
c h e c k o f
+ 2 7 5 v o l t s ,
v o l t a g e s :
a t
r i p p l e
t h r e e
t e s t p
t h e
v o l t a g e s
1 5 3
! 1 0 % ,
t h e Mo d e l
c r u c i a l c omp o n e n t s a n d
Wave Form a t Junc ti on o f
Cap a c i t or C 30 2B
a n d
Vert i c a l
s e t t ing
2 m s
c m .
/
+ 1 2
v o l t
Form
Wav e
a t
i s 20
5 m s
/
c m .
I
o f t u
p i n
b
e
t h e RANGE
Swi t ch t o
t h e BIAS ADJ Po t en
d j
u s t
A
e
t h e
s h o r t b e t w e e n
v
and
t o
+
t h e
i s
t h e
i n s t r u m e n t .
i n d i
t h e c i r
o
i n t s
s e l e c t e d
a t
i n p u t
i s
t o
Re s i s
is
5 m v / c m ;
s
d c .
- 1 3
V o l t
m v / c m
V i0 3
t o
1
VOLT ;
T.
p.
a n d
t h e
FUN CT IO�
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