CALIBRAT ION
MODEL
1 5 3
MI CROVOLT-AMMETER
S e t
t
h
e
Mod e l 2 60
to
a
p
p
l
y
+1
vo l t .
The
Mod e l
1 5 3
me t er s h ou ld
r e a d
fu l l
s c a l e ,
1 v
o
l
t
:0 . 5 % .
I f
n e c e s s a ry ,
ad j u s t t h e
METER
C A L
Po t en t i om e t e r ,
R 1 7 6
( Figure 2
0
) ,
f o r
a
£ u l l
s
c
a
l
e
d e f l ec t i on .
Th i s a d
j
u
s
t
s
t h e me t e r
f o r
a l l
v o l ta g e rang e s b e l ow
1
v o l t .
c .
Us ing
t h e
s a me
s e t t ings
and
inpu t
a s
i n t h e
previous s t e p , a d j u s t t h e OlITPlIT
ADJ
C on t r o l
on
th e
r e a r
p a n e l
f o r
a
I
-
v
o
l
t
ou t p u t
! l %.
d .
Remove the
inpu t
s
i
g
n
a
l
f r om
the
Mod e l 1 5 3
a n d
s
h
o
r
t t he
inpu t
t ermina l s . Se t
t h e
MET ER
Swi t ch t o
C
E
NT
E
R
ZERO ;
k e e p t h e
FUNCT I ON
and RANGE
Swi t c he s
a s i n
s ub - p a ra g raph
b .
T h e me t er n e e d l e shou l d b e
a t
z e ro o n t h e b o t t om s c a l e .
I f
n e c e s s ary ,
a
d
j
u
s
t
t h e
CENTER
Z ERO
ADJ
Po t e n t i o m e t e r ,
RI 7 7
( Figure 20)
f o r z ero
m
e
t
e
r
d e f l e c t i on on the
b
o
t
t
om
s c a l e .
6-4 .
ATT ENUATOR
ADJU STMENT .
C
on
n
e
c
t
the Mod e l 24 1 V
o
l
t
a
g
e
Sup p l y t o
the Mod e l
1 5 3 INPlIT
Re c e p t a c l e .
S e t
the
Mo d e l
1 5 3
c on t r o l s
as
f o l lows :
MET ER
Swi t c h
FUNCTION
Swi t c h
RANGE Swi t ch
+
INPUT
R-
2
M
10
VOLTS
S e t t h e Mod e l 2
4 1
t o
app l y
+ 1 0 v o l t s .
Th e
Mod e l 1 5 3 s hou ld read f u l l
s c
a
l
e
,
10 vo l t s
±O . 5%.
I f n e c e s s a ry ,
a d j u s t
t h e
ATTENUATOR
ADJ
Po t e n t i o me t er ,
R 1 3 7 ( Fi gure 20) , f o r
a
f
u
l
l
-
s
c
a
l e
d e f l e c t i o n .
Th i s ad j u s t s
t h e m e t er f o r
a l l
vo
lt
a
g
e
rang es 3
vo l t s and
higher.
NOTE
B e fore mak ing
th i s
ad j us tmen t , warm
up
the
Mod e l 1 53 f o r
a t
l e a s t
t
w
o hours
and
make s ur e i t s
d r i f t
i s
w i t h in s p e c i f i c a t ions
( p arag raph
6 - 9 . )
6 - 5 .
OPEN
C IRC UIT
ZERO ADJUSTMENT .
S e t the Mode l
1 5 3
RANGE
S w i t c h
t o 3 0
MICROVOLTS .
Shunt the input
with
a
2 2 -me gohm
shie l ded
r
e
s is
t
o
r
b e tween the h igh
( c ent e r t e rmina l )
and
low
( inne r
sh i e l d )
o f
the
INPUT
Re cept ac l e .
S e t the
FUNCTION
Sw i t c h
to
AMPS ;
z e r o the
me te r
us ing
th e front
p ane l
ZERO
Contro l .
Sw i t ch
the
FUNCTION
Swi t ch
to
OPEN
and
ad j us t
the
OPEN CIRCUIT
Z
E
R
O
Po t entiometer ,
R160
( F igure 2 0 ) ,
for
a ze ro
meter
r e ad ing .
Re turn
the
FUNCTION
Switch
t o
AMPS
pos i t ion and
recheck
for me ter z e ro .
6- 6 .
VERIFICATION
OF VOLTAGE
CALIBRAT ION .
a .
Ca l ib ra t e
th e
vo l tage rang es for
a
fu l l - s ca l e me t e r
d e f l ec t i on
on
a l l
rang e s , b oth
p o s i t ive
and
ne
g
a
t
i
v
e p o l arity .
Ca l ib r a t e
th e
lO -mi cr ovo l t
t o I - vo l t
rang e s b ef ore
c a l ib r a t ing the h
ig
h e
r
rang e s . Make s ure
p o t en t i ome t er
R 1 2 5
is
a d j u s t ed ( paragraph
5- 5 ) .
b .
For the
rang es
f rom 10 mic rovo l t s t o
1
vo l t , c onne c t the Mod e l 2 60 t o the
Mod e l
1 5 3
inpu t .
For e a c h rang e , s e t the Mod e l 2 60
f o r
a f u l
l -
s
c
a
le input
( i . e . , lO - mi c rovo 1 t in
put s igna l f or t h e 10 -mi c r ovo l t rang e ; 30 - m i c r ovo l t inpu t
s igna l
f o r t h e 30 -mi c r ovo l t
rang e ,
e t c . ) .
For
the
10 and 30 -mi crovo l t rang e s , th e Mod e l 1 5 3 s hou ld read w i t h in ± 2 . 5 % ;
f o r t h e
lOa- mi crovo l t
t o I -mi l l ivo l t range s , wi thin ± 1 . 5 % ; f o r t h e 3 - mi l l ivo l t
t o
l - vo l t
rang e s , wi thin ±0 . 5 %.
On
the z ero- l e f t
sca l e ,
1 %
i s equiva l en t t o one minor d ivi s i on .
Ch ec k f or b o t h p o s i t ive
and
n
e
g
a t
i
v
e
p
o
la
r
i
t
y
.
I f
n e c e s s ary ,
a d j u s t
the
METER C
A
L
Po t e n
t i ome t er ,
R1 7 6
( F igure 20 ) , un t i l a l l rang e s
mee t
s p e c i f i ca t i on s .
I f
t he p o t ent i ome t e r
i s
a d j u s t ed
f
o
r
any
sub s equent rang e ,
r
ep
e
a
t
t h e
ca l ib ra t i o n f o r e a ch p r ev i ou s rang e
unt i l
a l l rang e s a r e within t h e
required
a ccuracy .
c .
F o r the rang e s f rom
3 to
1000 v o l t s , c onne c t t h e Mo d e l
24 1
Vo l t a g e
Supply
t o
the
Mod e l 153 inpu t .
F o r e a c h rang e , set t h e Mod e l
24 1
f o r
a
f u l l - s ca l e inpu t .
For
a l l t h e s e
2 4
Содержание 153
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