Aeroflex ATC-1400A-2 - Page 30

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 3 0
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
87654321
O
N
O
F
F
GPIB ADDRESS
IEEE 488 - 1978
SH1
L4
PP0
AH1
LE0
DC1
T6
SR1
DT1
TE0
RL1
C0
ON
OFF
1
0
1
0
1
0
1
0
1
0
A1A5
SW701
0103
STEP PROCEDURE
27. En s u r e Swit c h 3 of S W 7 0 1 (Rea r P a nel) i s set t o O N .
28. Us i n g ext e r n al c o n t roll e r in GPIB mo d e , go t o m o n ito r m o d e by k e y i ng l e t t er 0
and W D C F 9 4 0 for n a r row wi n d o w . Ver i f y TP40 3 ( 2 -2- 2 , F igur e 2 5 ) is h i g h
(inv a l i d pa i r d ete c t i o n).
29. Se t D u a l Pu l s e Genera t o r CAL/V e r n i er S w i t c h to C A L a nd o u t p u t p u l s e spa c i n g
for 2 4 . 0 µs .
30. Ve r i f y TP4 0 3 is l o w .
31. Set D u a l Pul s e G e n erat o r C A L /Ver n i e r Swit c h t o Ve r n i e r an d o u tput p u l se
spa c i n g to 2 3 .3 µs. D e c r ease o r inc r e a se o u t pu t p u lse s p aci n g u nti l T P40 3
goes h i gh.
32. Ve r i f y s p a c ing b e t ween t w o pul s e s is 2 3 . 25 µs ( ±0 . 1 µs ).
33. Se t D u a l Pu l s e Genera t o r CAL/V e r n i er S w i t c h to C A L a nd o u t p u t p u l s e spa c i n g
for 2 4 . 7 µs .
34. Set D u a l Puls e G e n e r ator C A L / V erni e r S w itc h t o Ve r n i e r. I n c reas e o r de c r e a se
outp u t pul s e spa c i n g un t i l TP 4 0 3 goe s h igh .
35. Ve r i f y s p a c ing b e t ween t w o pul s e s is 2 4 . 75 µs ( ±0 . 1 µs ).
36. If p r o per r e s ults c a n not b e obta i n e d in S t e ps 2 7 t hrou g h 3 5, p e r f orm St e p s 37
thro u g h 39. W h en r e s u lts a r e ob t a i n ed g o t o St e p 40.
37. Se t D u a l Pu l s e Gener a t o r ou t p u t pul s e spac i n g for 2 3 . 25 µs .
38. Set R 4 1 7 (24 µs Dec o d e r Ad j u s t ) (2 - 2 - 2, F i g u r e 25 ) t o th r e s h old w h e r e TP 4 0 3
goes h i gh.
39. Repe a t proc e d u res i n S tep s 2 9 th r o u g h 35 .
40. Ty p e " Q" an d " !" t o r etur n t o lo c a l mode.
41. Set D E C O D E R W I D E / N A R R O W S w itc h t o WIDE.
42. Set D u a l Pul s e G e n erat o r CAL/Ve r n i e r Con t r o l Swit c h t o CAL a n d o utp u t p ulse
spac i n g fo r 3 3 .5 µs.
43. Set D u a l Puls e G e n e rato r C A L / Vern i e r Swit c h t o V e r n i er. D e c r e ase o r incr e a s e
out p u t pul s e spa c i n g u n t i l a f l a shi n g "F " i s di s p l a yed o n DME-PRF Hz / X P DR %
- REPLY D i s p lay .