Aeroflex ATC-1400A-2 Maintenance Manual page 23

S T E P
9 . U s i n g O s c i l l o s c o p e s t a r t a n d s t o p c o n t r o l s , c r o s s l e a d i n g a n d t r a i l i n g e d g e o f P
p u l s e a t 5 0 % p o i n t ( 2 - 2 - 2 , F i g u r e 3 2 ) . V e r i f y p u l s e w i d t h i s 0 . 8 µs ( ± 5 n s ) .
A d j u s t R 2 6 0 3 ( X P D R P u l s e W i d t h A d j u s t ) ( 2 0 0 M H z C o n t r o l P C B o a r d A s s e m b l y )
( 2 - 2 - 2 , F i g u r e 2 6 ) a s n e e d e d f o r p r o p e r r e s u l t s .
X P D R P P u l s e w i t h L e a d i n g a n d T r a i l i n g E d g e s C r o s s e d a t 5 0 % P o i n t s
1
1 0 . S e t X P D R P U L S E W I D T H V A R / C A L S w i t c h t o V A R a n d X P D R P U L S E W I D T H
T h u m b w h e e l s t o 0 . 2 0
1 1 . S e t X P D R P U L S E W I D T H T h u m b w h e e l s t o 1 . 8 5
( ± 5 n s ) .
1 2 . S e t X P D R P U L S E W I D T H V A R / C A L S w i t c h t o C A L . V e r i f y X P D R p u l s e s p a c i n g
d i s p l a y e d o n O s c i l l o s c o p e f o r X P D R M O D E C o n t r o l i s w i t h i n t o l e r a n c e a s
f o l l o w s :
S E T T I N G
M o d e 1
M o d e 2
M o d e T
M o d e A / M o d e 3
M o d e B
M o d e C
M o d e D
1 3 . S e t S L S / E C H O O N / O F F S w i t c h t o O N . V e r i f y P
( ± 5 n s ) .
1 4 . S e t X P D R P / P
2
∆
+ . V e r i f y P t o P
1
1 5 . S e t X P D R P / P
2
V e r i f y P t o P
1 2
1 6 . S t e p X P D R P / P
2
p u l s e s p a c i n g s t e p s f r o m 1 . 1 0 t o 2 . 0 0 µs i n 0 . 0 5 µs s t e p s .
1 7 . S e t X P D R D E V P
f r o m 0 . 0 0 t o 1 . 8 5
i n 0 . 0 5 µs s t e p s .
S u b j e c t t o E x p o r t C o n t r o l , s e e C o v e r P a g e f o r d e t a i l s .
MAI NT ENANCE MA NUAL
ATC-1400A-2
P R O C E D U R E
F i g u r e 3 2
µ
s . V e r i f y p u l s e w i d t h i s 0 . 2 µs ( ± 5 n s ) .
D E V T h u m b w h e e l s t o 1 . 8 5 a n d X P D R D E V P
3
p u l s e s p a c i n g i s 3 . 8 5 µs ( ± 5 n s ) .
2
D E V T h u m b w h e e l s t o 0 . 9 0 a n d X P D R D E V P
3
p u l s e s p a c i n g i s 1 . 1 0 µs ( ± 5 n s ) .
D E V T h u m b w h e e l s f r o m 0 . 9 0 t o 0 . 0 0
3
∆
/ C A L S w i t c h t o +
2
µ
s . V e r i f y P t o P
1 2
µ
s . V e r i f y p u l s e w i d t h i s 1 . 8 5 µs
P U L S E S P A C I N G
3 . 0 µs ( ± 5 n s )
5 . 0 µs ( ± 5 n s )
6 . 5 µs ( ± 5 n s )
8 . 0 µs ( ± 5 n s )
1 7 . 0 µs ( ± 5 n s )
2 1 . 0 µs ( ± 5 n s )
2 5 . 0 µs ( ± 5 n s )
p u l s e s p a c i n g i s 2 µs
t o P
1 2
µ
s a n d v e r i f y P
a n d s t e p X P D R P / P
2 3
p u l s e s p a c i n g s t e p s f r o m 2 . 0 0 t o 3 . 8 5 µs
1
7503002
/ C A L S w i t c h t o
2
∆
/ C A L S w i t c h t o - .
2
t o P
1 2
D E V T h u m b w h e e l s
2 - 2 - 2
P a g e 2 3
F e b 2 / 0 9