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6-6
MEASURING DIFFERENTIAL GAIN (DG)
18. T u r n L I N E S E L E C T O R © o f f , and s e t S W E E P ©
waves to a d e v i c e to be measured, and input the output from the d e v i c e to A I N P U T ® .
A d j u s t
t h e l e v e l
example of waveform w i t h a d i f f e r e n t i a l g a i n of 1 0 1
6-7
MEASURING K-FACTOR
19. Set R E S P O N S E © to FLAT and S W E E P © to 2H.
20. Use a t e s t s i g n a l i n c l u d i n g 2T p u l s e s and bar s i g n a l .
2 1 . To measure t h e 1 ine time d i s t o r t ion and p u l s e - t o - b a r
of the s i g n a l w i t h t h e p e d e s t a l
of t h e c o m p o s i t e t e s t
r i g h t of t h e s c a l e c e n t e r .
the w h i t e b a r c e n t e r to 100IRE u s i n g the GAIN c o n t r o l © .
of the bar i s on a downward arrow.
22. To o b t a i n t h e K - f a c t o r of a l i n e time d i s t o r t i o n , measure t h e maximum d e v i a t i o n of
bars w i t h i n a frame.
the frame because of p o t e n t i a l r i n g i n g , o v e r s h o o t ,
l i n e frame i n d i c a t e s the 4% K - f a c t o r , and the inner d o t t e d - 1 i n e
( F o r a s i g n a l h a v i n g
d e v i a t i o n w i t h i n t h e frame when a r i s i n g edge i s matched w i t h an upward a r r o w and a
d e v i a t i o n w i t h i n the frame when a f a l l i n g edge i s matched w i t h a downward a r r o w . )
23. Measure t h e p u l s e / b a r K - f a c t o r (Kpb) u s i n g s o l i d l i n e s and d o t t e d - l i n e s a t t h e s c a l e
c e n t e r .
These s o l i d l i n e s and d o t t e d - l i n e s a r e g r a d u a t e d a c c o r d i n g
f o r m u l a s :
1
( 1 - 4 K )
K = 0.02 ... 2% K - f a c t o r (dashed
K - 0.04 ... 4% K - f a c t o r ( s o l i d
20
t o m a t c h t h e s c a l e
1ine ( 0 1 RE 10.3) of the s c a l e .
s i g n a l ' s b a r w i t h an upward a r r o w l o c a t e d s i i g h t l y
A d j u s t
The f i r s t and l a s t l ^ s d i v i s i o n s a r e ignored and not i n c l u d e d i n
a b a r o f o v e r
.
1
a n
( 1 + 4K)
t o 1H or 2H.
u s i n g G A I N ©
and G A I N ® .
r a t i o , match the p e d e s t a l
t h e s i g n a l a m p l i t u d e between t h e base 1 i n e and
or u n d e r s h o o t .
18y"s i n h a l f - a m p 1 i t u d e
l i n e )
l i n e )
I n p u t modulated
s t a i r c a s e
T h e p h o t o
Match t h e r i s i n g edge
t o t h e
Check t h a t the f a l l i n g edge
The o u t e r
frame the 2% K - f a c t o r .
l e v e l ,
m e a s u r e a
to t h e f o l l o w i n g
i s an
l e v e l
s o l i d -
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