Time R A T I O Measurements - Kenwood DCS-8200 Instruction Manual

Programmable digital storage oscilloscope
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The r i s e
i n t h e f o l l o w i n g .
(D
Move t h e 1 0 0 % p o i n t o f t h e w a v e f o r m t o s c a l e
c o n t r o l ,
h o r i z o n t a l s c a l e
w a v e f o r m t o s c a l e
t h e d i s t a n c e t o t h e p o i n t w h e r e t h e r i s e
i n t h e c e n t e r o f t h e CRT.
The h o r i z o n t a l d i s t a n c e o f t h e r i s e
M u l t i p l y t h i s h o r i z o n t a l d i s t a n c e by t h e SWEEP TIME/DIV s e t t i n g v a l u e .
R i s e ( f a l l )
b)
C u r s o r measurement
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As w i t h
peak h e i g h t 5 d i v i s i o n s o f t h e CRT, and a l i g n t h e w a v e f o r m t o be measured w i t h t h e 0% and 100% CRT
s c a l e m a r k s .
®
S e t t h e c u r s o r measurement mode t o A T .
®
A l i g h t h e A R E F c u r s o r t o t h e p o i n t w h e r e t h e w a v e f o r m t o be m e a s u r e d i n t e r s e c t s t h e 1 0 % s c a l e
l i n e and t h e A c u r s o r t o t h e p o i n t w h e r e t h e w a v e f o r m i n t e r s e c t s t h e 9 0 % s c a l e
®
The m e a s u r e d r e s u l t
5 )
Time r a t i o m e a s u r e m e n t s
a )
Duty
r a t i o
The s q u a r e wave d u t y r a t i o measurements a r e p e r f o r m e d a s f o l l o w s .
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C o n n e c t t h e s i g n a l t o t h e INPUT t e r m i n a l .
t h e AC/DC t o DC
o b t a i n e d .
N e x t , a d j u s t t h e VOLTS/DIV and SWEEP TIME/DIV s o t h a t t h e w a v e f o r m i s e a s y t o m e a s u r e .
(D
A d j u s t
t h e SWEEP V A R I A B L E s o t h a t one c y c l e o c c u p i e s
a l i g n i t w h i l e o p e r a t i n g
(D
S e t t h e c u r s o r measurement mode t o A T .
NOTE
I Time r a t i o c a n be measured i f t h e SWEEP TIME i s n o t s e t t o CAL.
(D
A l i g n t h e A R E F c u r s o r w i t h t h e l e f t s i d e o f t h e
and t h e A c u r s o r w i t h t h e r i g h t
©
T h e d u t y
o f t h e CRT, s u p p o s i n g 5 d i v i s i o n s a s 1 0 0 1
50
( f a l l )
t i m e c a n be m e a s u r e d e v e n i f t h e d e t a i l s
and m e a s u r e t h e d i s t a n c e t o t h e p o i n t w h e r e t h e r i s e
l i n e
i n t h e c e n t e r o f t h e CRT.
l i n e
i n t h e c e n t e r
T h i s d i s t a n c e i s D2.
t i m e = ( D l + D2) ( d i v ) x
p r o c e d u r e s
t h e n o r m a l p r o c e d u r e s ,
a d j u s t t h e y
i s d i s p l a y e d f o l l o w i n g t h e A T
(GND s w i t c h o f f ) , a n d a d j u s t e a c h c o n t r o l s o t h a t t h e n o r m a l sweep
t h e
s i d e .
r a t i o
i s d i s p l a y e d a s a p e r c e n t a g e
l i n e
i n t h e c e n t e r o f t h e CRT w i t h t h e y
T h i s d i s t a n c e i s D l .
t h e -4^
o f t h e CRT w i t h
( f a l l )
p o r t i o n
i n t e r s e c t s
( f a l l )
i s found by a d d i n g D l t o D2.
SWEEP TIME/DIV s e t t i n g
P O S I T I O N c o n t r o l s o t h a t t h e w a v e f o r m p e a k - t o -
i n t h e upper r i g h t o f t h e CRT.
S e l e c t t h e c h a n n e l t o be u s e d w i t h t h e V-MODE, s e t
5 d i v o f t h e CRT s c a l e ,
POSITION c o n t r o l .
d i s t a n c e between t h e 2 p o i n t s t o be m e a s u r e d ,
f o l l o w i n g t h e R A T I O d i s p l a y i n t h e u p p e r
a t i t e m (D and b e l o w a r e a s shown
A
( f a l l )
p o r t i o n
i n t e r s e c t s t h e
Move t h e 9 0 % p o i n t o f t h e
P O S I T I O N c o n t r o l ,
and m e a s u r e
t h e h o r i z o n t a l s c a l e
v a l u e
l i n e .
and i f n e c e s s a r y
POSITION
l i n e
c a n be
r i g h t

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