Aeroflex ATC-1400A-2 - Page 24

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 4
Subj e c t to E x p o rt Con t r o l, s e e C o ver P a g e fo r d e tail s . F e b 2/ 0 9
STEP PROCEDURE
18. Set A T C - 1 400 A - 2 cont r o l s as f o l l ows:
CONTROL SETTING
SLS/ECHO ON/OFF S w i t c h OFF
XPDR DEV P
3
/CAL Swi t c h +
∆
XPDR DEV P
2
/CAL Swi t c h CA L
XPDR MODE Contro l A
19. Ver i f y P
1
to P
3
pul s e spa c i n g i s 9 .85 µ s ( ± 5 ns).
20. Set XPDR DE V P
3
/CAL S w i t c h to -
∆ . Ve r i f y P
1
to P
3
pul s e spa c i n g i s 6 .15 µ s
(±5 ns ) .
21. Step X P D R P
2
/P
3
DEV T h u m b w h e els f r o m 1 . 85 t o 0 .00
µ s an d v erif y P
1
to P
3
puls e s pac i n g ste p s fro m 6 . 1 5 to 8 . 0 0 µs i n 0 .05 µs s t e p s.
22. Set XPDR DE V P
3
/CAL S w i t c h to +
∆ and s t e p XP D R P
2
/P
3
DEV T h u m b w h e els
from 0. 0 0 t o 1. 8 5 µ s. V e r i f y P
1
to P
3
pul s e spac i n g st e p s fro m 8 . 0 0 to 9 . 85 µs
in 0 . 0 5 µs st e p s .
23 Set XPDR D E V P
3
/CAL S w i t c h to CAL .
24. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s t o 1 7 . 5 INTERF-. V e rify o n
Oscil l o s co p e a pu l s e is p o sit i o ned 1 7 .5 µs ( ± 0 . 0 5 µs) bef o r e lea d i n g ed g e o f P
1
.
25. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s to 1 0 0 . 0 INTERF + . Veri f y o n
Oscil l o s co p e a pu l s e is p o sit i o ned 1 0 0 µs ( ± 0 . 0 5 µs ) af t e r lea d i n g ed g e o f P
1
.
26. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s t o 3 9 9 . 0 INTERF + . Veri f y o n
Oscil l o s co p e a pu l s e is p o sit i o ned 3 9 9 µs ( ± 0 . 0 5 µs ) af t e r lea d i n g ed g e o f P
1
.
27. Wh i l e ste p p i n g S L S / ECHO Thumbwh e e l s fr o m 0 t o 9 a n d f rom -0 t o - 9 , v e r i fy o n
Oscil l o s cop e i n ter f e r enc e p uls e f oll o w s in a mp l i t ude .
28. Set INT R F P U L SE WID T H C o n trol f u l l y ccw an d D B L I NTERR/INTRF P U L S E
Thu mbwh e e l s t o 5 0 .0. V e rif y o n Osci l l o sco p e int e r f e ren c e pul s e i s < 0 . 2 µs
wide.
29. Set INT R F P U L SE WID T H C o n trol f u l l y cw. V e r i fy o n O s c ill o s c ope i n t erf e r e nce
pul s e i s > 5 µs .
30. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s to 0 3 5 . 0 DOUBLE. V e r i fy o n
Oscil l o sco p e P
1
of s e c ond i n t err o g a tio n p u lse o c curs 3 5 .0 µs ( ± 1 . 0 5 µs) afte r
lead i n g ed g e o f P
1
of f i r s t int e r r ogat i o n .
31. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s t o 1 0 0 . 0 DOUBLE. V e r i fy o n
Oscil l o sco p e P
1
of s e c ond i n t err o g a tio n p u lse o c curs 1 0 0 µs ( ± 3 µs) a f t e r
lead i n g ed g e o f P
1
of f i r s t int e r r ogat i o n .
32. S et SUPPRESSOR ON/ O F F S w itch t o O N . Ver i f y firs t i nter r o g atio n d i sap p e a r s,
supp r e s sor p u lse o c curs a t pr e v i ous p o s iti o n of P
3 and
seco n d int e r r o gat i o n
moves s o D B L INTE RR/ I N T R F PULSE T h u mbwheel s r efle c t spac i n g bet w e e n
supp r e s sor a n d P
1
of s e c o nd i n t e rro g a t ion.
33 Set SUPPRESSOR ON/O F F S w i tch t o O F F .
34. Set D B L I N T ERR/INTRF P U L S E Thumbwhe e l s t o 3 9 9 . 9 DOUBLE and P R F / S QTR
Thu mbwh e e l s t o 1 0 00 . V e rify P
1
of s e c o nd i n t err o g a t ion o c curs 3 9 9.9 µ s
(±12 µs) af t e r lea d i n g edg e o f P
1
of f i r s t int e r r ogat i o n .