MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 4 3
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
(12) Pa r a m e t e r Ver i f i c ati o n s
The f o l lowi n g p roc e d u re i s s tri c t l y a v e rif i c a t ion o f par a me t e r s fo r :
Reply E f fic i e n cy ( D ME Mod e )
TO , TD , T A C S y nc
Perc e n t Reply ( X P DR Mode)
Velo c i t y a t 1 0 00 K n o t s
Genera t o r Output V o l tage
Mutual S u ppre s s i on P u l se
Acce l e r a tio n
PRF at 1 0 0 0 Hz
Auto/ F r e q Ste p R a t e
Coupl e r Los s
PREREQUISITES: None
TEST E Q U I P M E N T : 1 O s c i llos c o p e
1 Dual P u l s e Gen e r a t or
1 Fre q u e ncy C o u n ter
1 Sign a l G e n era t o r
1 Tot a l i zing C o u nter
1 2.0 k Ω R e s i sto r
1 50 Ω Lo a d
1 Sto p w a t c h
SET-UP DIA GRAM: None
NOTE: Dur i n g per f o r mance o f t his p r o cedu r e , if a c ert a i n co n d i tio n o r sp e c i fic a t i on
cann o t b e ve r i f ied, r e f er t o a ppro p r i a te a s sembly t e s t p r o c e dur e i n 2-2 - 4 for
test i n g an d r e pai r o f fa u l t y as s e m b l y.
STEP PROCEDURE
1. Set A T C - 1 4 00A- 2 c o ntro l s a s f o l l o ws:
CONTROL SETTING
CW/NORM/OFF Switc h NORM
SUPPRESSOR ON/OFF Switc h ON
SLS/ECHO ON/OFF S w i t c h OFF
XPDR PULSE WI D T H V A R / C A L Switch CA L
DME DEV P
2
/CAL Swi t c h CAL
XPDR DEV P
3
/CAL Swi t c h CA L
XPDR DEV P
2
/CAL Swi t c h CA L
TO /TAC/TD Sw i t c h TO
PRF/SQTR ON/OFF S w i t c h ON
POWER Switc h ON
PRF/SQTR T h u m b w h e els 1000
DBL INTE RR/ I N T E R F PULSE T h u m b w h e els 0000 O F F
FREQ/FUNCT I ON S E L E C T Thumbwhee l s 1090 X P D R
2. Conne c t Oscil l o s cop e E xte r n a l Tr i g ger t o SYNC Con n e c tor , O s c i llo s c o pe
Chann e l A (lo a d e d with 2 . 0 k Ω r e s i s t or to g r o u n d) to S U P P R E SSOR OUTPUT
Conne c t o r an d O s c ill o s c ope C h a n nel B t o GEN Conn e c t or.
3. Ver i f y on Os c i l los c o p e Ch a n n el A , d isp l a y ed p u l se wi d t h is 3 3 µs (±3 µs).
4. S e t SUPPRESS O R V A R Adjust men t f u l ly cc w. V e rif y p u lse a m p l i tude i s <3 V .
5. S e t SUPPRESS O R V A R Adjust men t f u l ly cw. V e r ify p u l se a mp l i t u de i s > 27 V .
6. A d just S U P P R E S SOR VAR A d j u s tment for 1 8 . 5 V, a s di s p l aye d o n Osc i l l os c o p e.
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