ESI VideoBridge 2150, Service Manual

Page: 263 / 332

T o deacti vate e i ther te s t c ode, do o n e o f the f o l l ow ing:
1 . T e m p o r a r i l y g r o u n d Pi n 2 1 of the Han d l e r I n te rfa c e r e a r
p an e l c on n e c to r . G r ou nding i s ac c omp l i shed b y c o n n e ct i ng
Pin 21 to Pi n 1 3
(
Sy stem G r ound
)
o n the same c o n n e c to r .
2 . T u r n instrume nt powe r O F F the n ON again . I n this cas e, the
n o m i n a l va l u e , b i n l i m i ts , a n d b i n c o u n t e r s a r e z e r o e d
(
u n l e s s the N o n-V olati l e M e m o r y optio n is p r e s e nt and has
b e e n e na b l e d
)
. Se e Se ction A . 3 .
Th e Handl e r I nte r face p r o vide s the f o l l ow i ng f u n ctio n s:
1 .
2 .
NOTE : I ndicated po larity must be obse rved for each fun ction .
S T A R T T E ST is the act i ve H I G H i n put to an
0
p t
0-
i s o l a tor . T o
in i tiate a m e a s u r e m e nt, it requi r e s a h o l ding c u r re nt o f 20 mA to
70 m A f o r a minimum of 1 0 ms .
B U SY i s the active H I GH, op e n c o l l e c to r output o f an opto-
i s o lato r. Thi s s ignal i s u s ed to a r r e s t hand l e r ope rati o n dur i ng
te s t and c a n be changed to acti ve L OW by mo ving jumpe r W3 o n the
Ha n d l e r I nte rfa c e C i r c uit Card. The o pto-is o l ato r fo r B r ow n e and
Daymar c hand l e r s
(
T I L l 1 9
)
c an s i nk a maximum cur r e nt of 1 25 mA and
ha s a c on ti nuou s p ow e r dis s i pa ti on ra t ing of 1 5 0 mW . The o pto­
i s o l a t o r f o r the G e n e r al hand l e r
(
4 N 28
)
c a n s i n k a maxi m u m
cu r r e n t o f 3 mA .
3. E N D O F C O N V E R S I O N
(
A N A L O G B U SY
)
i s the a c ti v e L O W r e l ay
c l o s u re f r om c o mm on to the output of B I N 1 1
(
s e e Figur e B-1 .
)
T h i s s ignal a l l ow s the handl e r to advan c e to the next c omp o n e nt
f o r t e s t i n g w h i l e c a l c u l ati o n s a r e s t i l l b e i n g made o n the
p r e vi o u s d e v i c e u n d e r te s t. The E O C c apa b i l ity is e na b l e d b y
p r og r ammin g te s t c ode 1 6 and c l eared b y te s t c ode -1 6 .
e
l
s
l
i
A - 4
21 5 0
/
21 60 9
/
85