DC : DC coupled t r i g g e r s i g n a l i s input to the t r i g g e r c i r c u i t . T h i s p o s i t i o n i s
used f o r low-frequency s i g n a l s below 10 Hz.
TV FRAME: V e r t i c a l s y n c h r o n i z a t i o n p u l s e s a r e e x t r a c t e d f r o m t h e c o m p o s i t e v i d e o
s i g n a l s and input to the t r i g g e r c i r c u i t .
TV LINE : H o r i z o n t a l s y n c h r o n i z a t i o n p u l s e s a r e e x t r a c t e d from t h e c o m p o s i t e v i d e o
s i g n a l s and input to the t r i g g e r c i r c u i t .
• T r i g g e r mode
S e l e c t an intended t r i g g e r mode.
AUTO : Operat ion r u n s f r e e and t h e t r a c e 1ine a p p e a r s even i f t h e r e i s no t r i g g e r
s i g n a l . Use NORM to observe low-frequency waveform below 40 Hz.
NORM : Sweep o p e r a t i o n i s e x e c u t e d a c c o r d i n g to t h e t r i g g e r s i g n a l . Sweep o p e r a t i o n
i s not executed i f t h e r e i s no t r i g g e r s i g n a l .
F I X : Sweep o p e r a t i o n i s e x e c u t e d a c c o r d i n g to t h e c e n t e r o f t h e a m p l i t u d e o f t h e
t r i g g e r s i g n a l a s the t r i g g e r p o i n t . I n t h i s mode, the t r i g g e r l e v e l need not
be a d j u s t e d .
SINGLE: S e l e c t s the s i n g l e sweep mode. (See 7-6)
RESET : S e t s the o s c i l l o s c o p e f o r t r i g g e r i n g i n the s i n g l e sweep mode. (See 7-6. )
3) Composite video signal d i s p l a y
When i n p u t t i n g composite video s i g n a l s , s e t the COUPLING c o n t r o l to e i t h e r TV FRAME or
TV LINE. A l s o s w i t c h the SLOPE c o n t r o l i n accordance w i t h the s i g n a l p o l a r i t y .
Figure 8 R e l a t i o n s h i p between COUPLING and SLOPE
[SLOPE
T V - F
T V - L
