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The CV-1240 uses a s c a l e f o r the NTSC system of 525
s c a l e f o r the PAL
s u r f a c e of the s c r e e n a g a i n s t p a r a l l a x d u r i n g o b s e r v a t i o n and photographing.
i l l u m i n a n c e of the s c a l e f o r easy o b s e r v a t i o n u s i n g the ILLUM c o n t r o l .
F i g u r e 2-1
i s t h e s c a l e of t h e CV-1240.
from - 5 0
IRE to + 1 2 0
• There i s a s c a l e graduated at an i n t e r v a l of 2 IRE s i i g h t l y to the l e f t of the c e n t e r of
— 4 0
IRE l i n e and
amplitude of a s y n c h r o n i z i n g s i g n a l and w h i t e
• The
b l a c k
l e v e l i s marked i n the 7. 5 I R E p o s i t i o n
p o s i t i o n by a d o t t e d
• The
r i g h t s c a l e
0 1
and
- 4 0
IRE
• Frames l o c a t e d s i i g h t l y
measure the 1 i n e time d i s t o r t i o n .
l i n e frame 4 1
• A dotted
l i n e and a s o l i d 1ine at the c e n t e r of the + 1 0 0
the p u l s e - t o - b a r
14
5.
SCALE DESCRIPTION
s y s t e m of 625
1 i n e s and
F i g . 2-1
IRE at an i n t e r v a l of 10 I R E .
the c e n t e r of + 1 0 0
1ine.
i s used to measure the m o d u l a t i o n d e g r e e .
1 0 0 1
to the r i g h t of the c e n t e r of the + 1 0 0
The
The 2T bar of 18/^s i n h a l f - a m p l i t u d e l e v e l i s used f o r measurement.
They are weighted w i t h a K - f a c t o r of 2% and 4% r e s p e c t i v e l y .
r a t i o .
l i n e s and 60Hz.
50Hz.
B o t h s c a l e s a r e marked on the
S c a l e of the CV-1240
The
l e f t
s c a l e
140 IRE corresponds to 1. 0V.
IRE 1 i n e .
These s c a l e s a r e used to measure the
l e v e l .
and
dot t e d - 1 i n e frame i n d i c a t e s 2 1
The
CV-1245 uses a
A d j u s t
i s marked i n I R E and
the 15% w h i t e
i n t h e 77
+ 1 2 0
I R E c o r r e s p o n d s to
IRE 1ine a r e used to
and
the
IRE 1ine a r e used to measure
i n n e r
the
r a n g e s
I R E
s o l i d -
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