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Applications
1 . Using as Sine Wave O s c i l l a t o r
A G - 2 0 3 c a n be u s e d as a sine w a v e o s c i l l a t o r as o u t -
l i n e d b e l o w .
1.1
S i n c e t h e u n i t f e a t u r e s l o w d i s t o r t i o n f a c t o r , it
c a n
be
used f o r
c h a r a t e r i s t i c o f a m p l i f i e r .
1.2
S i n c e t h e u n i t f e a t u r e s w i d e b a n d w i d t h , it c a n
be u s e d f o r m e a s u r e m e n t o f f r e q u e n c y c h a r a c -
t e r i s t i c o f a m p l i f i e r .
1.3
T h e b u i l t - i n high a c c u r a c y
m e a s u r e m e n t o f a m p l i f i e r g a i n .
1.4
C a n be u s e d as a s i g n a l ' s o u r c e of i m p e d a n c e
b r i d g e .
2 . Measurement of A m p l i f i e r G a i n
A n
e x a m p l e o f
m e a s u r e m e n t o f
d e s c r i b e d b e l o w .
F i r s t c o n n e c t A G - 2 0 3 , a m p l i f i e r t o be t e s t e d a n d A C
v o l t - m e t e r as s h o w n in F i g . 4 .
1. A d j u s t A T T E N U A T O R
so t h a t A C v o I t - m e t e r i n d i c a t e s t h e r a t e d o u t p u t
( s u p p o s e d
t o
be
1 V
a m p l i f i e r .
T o
f a c i l i t a t e
a d v i s a b l e t o
set A T T E N U A T O R
p o s s i b l e .
A s s u m e t h a t A T T E N U A T O R
- 5 0 d B f o r t h e r a t e d o u t p u t .
2 . D i s c o n n e c t t h e a m p l i f i e r a n d c o n n e c t t h e A C v o l t -
m e a s u r e m e n t o f
d i s t o r t i o n
a t t e n u a t o r
p e r m i t s
a m p l i f i e r
gain is
( 3 ) a n d A M P L I T U D E ( 7 )
in
t h i s
e x a m p l e ) o f
t h e
t h e
m e a s u r e m e n t , it
is
( 3 ) as l o w as
( 3 ) is set
m e t e r to A G - 2 0 3 t o m e a s u r e t h e o u t p u t v o l t a g e .
N o t e t h a t t h e use o f A T T E N U A T O R ( 3 ) e l i m i n a t e s
t h e
need f o r c o n n e c t i n g a high s e n s i t i v i t y v o l t -
m e t e r , I f A T T E N U A T O R ( 3 ) is set t o O d B a n d t h e
v o l t m e t e r
i n d i c a t e s 2 V , it m e a n s t h a t t h e i n p u t
v o l t a g e o f t h e a m p l i f i e r is 5 0 d B
f o r e , t h e g a i n o b t a i n e d is as f o l l o w s ;
5 0 d B + 2 0 \og
-^L
10
= 5 Q d B - 6 d B
= 4 4 d B
3 . M e a s u r e m e n t of Phase C h a r a c t e r i s t i c
C o n n e c t A G - 2 0 3 a n d a n o s c i l l o s c o p e t o t h e a m p l i f i e r
t o be t e s t e d as s h o w n in F i g . 5 . I f t h e r e is n o p h a s e s h i f t
a b o u t t h e o u t p u t signal o f t h e a m p l i f i e r , t h e o s c i l l o s c o p e
w i l l d i s p l a y a s t r a i g h t fine as s h o w n i n F i g . 5 A . I f t h e
A G - 2 0 3
O U T
P U T
F I G . 4
b e l o w 2 V . T h e r e -
d B
A C voltmeter
Amplifier
under test
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