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Panasonic MN662785TBUC Manual page 27

Signal processing ic for cds

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MN 6 6 2 7 8 5 T B U C
( C ) S e t t i n g o f g a i n c r o s s o v e r f o r o p t i c a l s e r v o l o o p
B e f o r e p e r f o r m i n g f o c u s a n d t r a c k i n g a u t o m a t i c a d j u s t m e n t s , g a i n c r o s s o v e r a f t e r a u t o m a t i c a d j u s t m e n t c a n
b e d e t e r m i n e d b y w r i t i n g d a t a t o t h e l a b e l n a m e G S E T ( a d d r e s s : 1 0 h ) a c c o r d i n g t o t h e t a b l e b e l o w .
I n t h e a u t o m a t i c g a i n a d j u s t m e n t , d i s t u r b a n c e i s i n p u t t o t h e s e r v o l o o p , a n d g a i n i s i n c r e a s e d o r d e c r e a s e d
a c c o r d i n g t o t h e G S E T s e t t i n g a f t e r a d j u s t i n g t h e g a i n s o t h a t t h e f e e d b a c k g a i n a t t h e d i s t u r b a n c e f r e q u e n c y
b e c o m e s 0 d B ( g a i n c r o s s o v e r i s e q u a l t o t h e d i s t u r b a n c e f r e q u e n c y ) .
( S e t t i n g f o r f o c u s s y s t e m )
D a t a
( D 7 t o D 0 )
D 3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
(Setting for tracking system)
D a t a
( D 7 t o D 0 )
D7
D6
D5
D4
1
1
0
1
0
1
1
0
0
1
0
1
0
1
0
0
0
0
1
1
0
0
1
0
0
0
0
1
0
0
0
0
1
1
1
1
0
1
1
1
1
1
0
1
1
1
0
0
1
0
1
1
1
0
1
0
1
0
0
1
1
0
0
0
A d d r e s s ( H E X )
( A 7 t o A 0 )
D 2
D 1
D 0
1 0
1
1
1
1
1
0
0
1
1
1
0
0
0
1
1
0
1
0
0
0
1
0
0
0
1
1
1
1
1
0
1
0
1
0
1
0
0
1
1
0
1
0
0
0
1
0
0
0
A d d r e s s ( H E X )
( A 7 t o A 0 )
1 0
C o m m a n d ( H E X )
F o c u s g a i n a t t h e d i s t u r b a n c e f r e q u e n c y o f 7 5 0 H z
F2
A p p r o x . v a l u e: −3 . 9 2 d B
A p p r o x . v a l u e: −3 . 3 6 d B
A p p r o x . v a l u e: −2 . 8 0 d B
A p p r o x . v a l u e: −2 . 2 4 d B
A p p r o x . v a l u e: −1 . 6 8 d B
A p p r o x . v a l u e: −1 . 1 2 d B
A p p r o x . v a l u e: −0 . 5 6 d B
* A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
A p p r o x . v a l u e:
Command (HEX)
Tracking gain at the disturbance frequency of 1 kHz
F2
Approx. value: −3.92 dB
Approx. value: −3.36 dB
Approx. value: −2.80 dB
Approx. value: −2.24 dB
Approx. value: −1.68 dB
Approx. value: −1.12 dB
Approx. value: −0.56 dB
* Approx. value:
Approx. value:
Approx. value:
Approx. value:
Approx. value:
Approx. value:
Approx. value:
Approx. value:
Approx. value:
S D D 0 0 0 2 6 A E M
T a b l e 7 - 1 - 4 ( 5 )
Function (
: Setting at reset)
0 d B
1 . 0 5 d B
2 . 1 1 d B
3 . 1 6 d B
4 . 2 1 d B
5 . 2 7 d B
6 . 3 2 d B
7 . 3 7 d B
8 . 4 3 d B
F u n c t i o n (
: S e t t i n g a t r e s e t )
0 dB
1.05 dB
2.11 dB
3.16 dB
4.21 dB
5.27 dB
6.32 dB
7.37 dB
8.43 dB
Table 7-1-4 (6)
27

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