Aeroflex ATC-1400A-2 - Page 45

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 4 5
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
26. Set R A N GE / V E L/ACCEL T h u m b w h e els t o 3 9 9.
27. Depr e s s LOAD A CCEL P u s hbu t t o n Swit c h and v e r ify 2 3 . 644 Hz ( ±0.0 3 H z ) is
dis p l a yed o n Fre q u e ncy C o u n ter .
28. Remove F r equ e n c y Cou n t e r an d r epla c e AT C-1 4 0 0 A-2 C a r d Cage A s s embly
cov e r .
29. Set SLS/E C H O O N / OFF Swit c h to OFF, PRF / S Q T R T humbwhee l s t o 1 0 0 0 and
FREQ/FUNCT I ON S E L E C T Thumbwhe e l s to 10 9 0 X P DR.
30. Con n e c t Fr e q u e ncy C o u n ter t o GEN Conne c t o r.
31. Ve r i f y ou t p u t on F r eque n c y Coun t e r at GEN Co n n e cto r , d ivi d e d by 2 , i s 9 9 9 . 9 5
to 1 0 0 0 . 05 Hz ( ±0 .005 % ) .
32. Conn e c t Dual P u l se Gen e r a tor t o T P35 0 1 ( Vide o A ssembl y ) ( 2-2- 2 , F igur e 2 6 ).
33. Se t D u a l Pu l s e Gener a t o r ou t p u t pu l s e spac i n g for 1 2 µs, pu l s e widt h f or 3 µs
and P R F f o r 150 H z .
34. Conn e c t Tot a l i zing C o u n ter C h a n nel A to G E N C o n n e cto r ( J10) a n d To t a l izin g
Counte r C h a nnel B t o SYNC Co n n e c tor.
35. Se t T o tali z i n g Cou n t e r Fun c t i on Co n t r o l to A / B an d R a n ge Co n t r o l to 1 0
2
.
NOTE: A/ B s ele c t i on o n T otal i z i ng Co u n t er p r o v ide s r a tio o f fre q u e n cy o f
Chann e l A di v i d ed b y f r equ e n c y of C h a n nel B .
36. 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
T
O/TAC/TD Swi t c h TO
PRF/SQTR ON/OFF S w i t c h OFF
DME REPLY EFF I C I E N C Y Control 100
FREQ/FUNCT I ON S E L E C T Thumbwhee l s 109 0 M H z X
37. Ve r i f y To t a l izi n g C o unt e r d isp l a y s a f r e que n c y rat i o of 2 . 0 .
38. Set DME REP L Y E F F I CIENCY C o n t r o l to 0 % r eply r a te. V e r ify T o t ali z i n g
Count e r disp l a y s a f r e que n c y ra t i o of 0 . 0 .
39. Se t T o tal i z i n g Cou n t e r ra n g e con t r o l to 1 0 5 .
40. Set DME REP L Y E F F I CIENCY C o n t r o l to 5 0 % rep l y r ate. V e rif y T o tal i z i n g
Count e r disp l a y s a f r e que n c y rat i o of 0 . 9 to 1 . 1 .
41. Set DME REP L Y E F F I CIENCY C o n t r o l to 7 0 % rep l y r ate. V e rif y T o tal i z i n g
Count e r disp l a y s a f r e que n c y rat i o of 1 . 3 to 1 . 5 .
42. Set D i s p lay S e l ect C o n t rol t o P R F /SQTR.
43. Set PRF / S Q T R O N / O F F S witc h t o ON, PRF/S QT R T h u mbwheels t o 500 a n d
FREQ/FUNCT I ON S E L E C T Thumbwhe e l s to 10 9 0 X P DR.
44. Conn e c t Tot a l i z ing C o u n t er Ch a n n e l A t o X MTR Conne c t o r.
45. Ve r i f y To t a l i zin g C o u nter r e adou t i s 2 X r ead i n g dis p l a yed o n Disp l a y Se l e c t.