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1 5 3
MOD E L
M e t e r j i t t e r o r i n s t a b i l i t y ,
1 .
H i g h
2 .
o f f s e t
t h e
t i o n b e t \· } e e n
3 .
5 1 0\11
r e s p o n s e
To m i n imi z e p i c ku p ,
c .
p o s s i b l e .
C o n n e c t a l l s h i e l d s
vo l t a g e
Th e
i n d u c e d d u e t o
f o r e ,
i
n i m i z e
l o o p
m
n e c t
t h e s h i e l d a t
o n l y o n e p o i n t .
t h e loop a rea
i s o n l y
To
d.
r e d u c e
t h e
a r e
n e t i c f i e l d s
p r e s e n t ,
c u i t .
t h e u n k n own e m f
i s a v a i l a b l e f r om s e v e r a l
1 5 3
e .
Th e Mo d e l
t h e
t e rmina l s .
inpu t
o f
t h e r i p p l e
i n
t h e
s t andard s
ha v i ng
h i g h
ma y
vo l t age whi ch
b e
2- 1 2 .
CIRCUI T CONNECTIONS .
a ,
When mea s u r i ng in
wi l l
t h e p o t en t ia l
ha v e
o n
s i gni f ic ant ,
now
b e
o f a pproxima t e ly
1 0
o f
thi s
'Wi r e wi l l
c
mi crovo l t
wou ld mean u s ing
b ,
F our - terminal connections can o ften
be used to eliminate t h is error .
t o
F i
g u
r
e 5 .
I f
a sma l l unwa n t e d v o l t age
c .
the
cons tant ,
Z ERO Co
nu l l i fy
the vo l tage.
d .
I f
t h e curren t s
t h e
mea suring
s y s t em f lu c t u a t e ,
d eve l o p
f luct ua t i ng vo l t ag e s wh
a p p ea r a s n o
i
s e o r d r i f t i n t he
OPERATING FROM SOURCE OTHER THAN 1 1 7
2 - 1 3 .
u s e
s c r ewdr iver
a
to
f rom
t h e f u s e
amp e r e
0 . 5
f r om
( d e
b i a s ) .
Rev e r s i n g t h e p owe r c o r d p o l a r i t y o r r e m o v i n g
ma y
LO a n
d
GND Po s t s
a c t i o n
t i me .
s l u g g i s h
k e e p t h e c i rc u i t
t o g e t h e r a t
a
f l ux
ma g n e t i c
a
r e
a
s
i n t h e s h i e l d c onn e c t i o n s a s we l l a s
Run a l l w i r e s
t h e sma l l d i f f e r en c e i n
o f
e f f e c t
ma gn e t i c
i t
b e
ma y
n e c e s s a ry t o mag n e t i c a l l y s h i e l d
c i r c u i t
o r a ux i l i a r y e q u i pme n t
c
e
om p a n i
s i n t h e f r om
l i n e
f r e q u e n c y r e j e c t i on
i n
The re f o r e ,
nu l l d e t e
working
s t a nd a rd a n d
c ompone n t s
a c
i
p p l e
r
t o l erated i n t h e
unknown .
t h e mi c r o v o l t
b e i ng mea s u r e d .
For
c o
m e imp o r tan t .
mi l li ohms
p e r f o o t .
t
d
op o f
a
u
s e a vo l
a
g e
r
wi re
an
a
inch
Re fer
d
o
r
p 1 s
o
b e u s e d t o
n
may
t r
l
or r e s i s t
a n
c e s i n
t
h e
y
wi l l
h
i
wi l l
c
s y s t em .
c hange
the 1 1 7 - 2 34 Swi t c h on t
p
t o
a m
e r e .
0 . 25
20 % o f
f u l l s c a l e .
10%
t o
o
a f f e c t
t h e a m
u n t o f o f f s e t .
a n d / o r
i n c o n s i s t e n t
awa y
f r o m a c
s o u r c e s .
of
1 0\-1
t h e
s i d e
i s p r o p o r t i o n a l
i n
t h e c i r c u i t a l o n g
o f
p o s i t i o n
t t,'O
f i e l d s , u s e ma g ne t i c s h i e l d i n g .
i n
the
o f
p l a t e s ,
t o t h e t o t a l a c v o l t a g e a p p ea r i n g
r e f e r s
c
a p p l i c a t i o n s ,
t o r
the
u
o
u n k n own
s
r c e
w i l l s i gnifican t l y r
o
the
reg i on ,
c
n s
i
d e r
Vo l t a g e drops , whi ch
2 0 AWG
examp l e No.
A
l - m1 1 l i a p e r e c
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r
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l ong .
FIGURE 5 ,
I f
the a c power s o u
VOLT .
h
ba c k
e
N o o t he r a d j u s tme n t
1 1
OP ERATING I N S TRU CT I O N S
r e a d i ns b e t ''' e e n
Sh i e l d a s c a r e f u l l y a s
t h e
i npu t o r a t
t h e L O Po s t .
t o t h e a r ea
o f
t h e
l o o p .
t h e i n p u t
c i r c u i t r y .
t h e
s a me
a d ja c e n t
td r e s .
"� e r e h i gh
t h e m e a s u r i n g c i r
c i r c u i t .
Na g n e t i c
f o i l
cab l e .
or
i s
a f f e c t e d
i t
.
Beca u se
o f
t h i s , w o r k i n g
d
e
u c e t h e a moun t
e f f e c t
t h e ph y s i
a
c
i n mos t
c i r c u i t s
c o
p p e
r
wire ha s
a r e s i s t a n c e
re
n t
t h rough a
6- i n c h
t h i s
r
To
reduce
d
o p b e l ow 1
Cu rr e n t
Lead s
Mod e l 1 5 3
Lea d s
1 5 3
Us i
n g
Mod e l
wi t h
Connections .
234 v o l t s ,
c
r
e
i s
pane l ( Fi gur e
3) .
Cha n g e
i s
nec es s a ry .
t h e
c o n n e c
r a n g e s .
Th e r e
C o n
p a t h .
s o
a c
ma g
s h i e l d i n g
a t
s u m
b y t he
o f
a c
l c on n e c t i o n s
a re
i n
l eng t h
4 - Termi na l
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