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4 . Fl Owcha Rt O Pe Ra T I O N; F L Owc H A Rt S U B Ro U T I N E S - HP 5363B Operating And Service Manual

Time interval probes
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M o d e l 5363 B
S e rv i c e
8 -1 1 4 .
Fl owcha rt O pe ra t i o n
8-1 1 5 .
T h e f o l l o w i n g p a rag ra p h s d e s c r i b e how t h e f l o wc h a rt can be u sed to d e te rm i n e a
b a s i c i d l e l o o p o pe rat i o n . Refe r to t h e d e ta i l e d f l o wc h a rt d i a g ra m s p r o v i d e d i n t h e b a c k of t h i s
secti o n .
8-1 1 6 .
T h e M a i n P ro g ra m I d l e L o o p R o u t i n e F l o wc h a rt .
C L R R M T C A L state 0 , w h i c h c l ea rs a n d p resets t h e A 5 H P- I B I n t e rf a c e Asse m b l y . States 1
a n 2 c h ec k t h e sta t u s of t h e rea r p a n e l B N C j a c k s
g ro u n d , t h e prog ra m w i l l e x i t t o t h e
o u t p u t 8 of t h u m b w h e e l selector. I f p r o b e A is s e l e cted , t h e t h u m b w h e e l o u t p u t d ata l i ne A i s
p u l l e d h i g h b y r e s i s t o r pac k A 1 R 1 30 , a n d fed a s a q u a l i f i e r b i t t o A 1 U 2 1 . Q u a l i f i e r , state 4
e xa m i n e s t h i s b i t a n d see i n g h i g h , j u m p s to state 5 1 . C o m m a n d S ET STA R T C H A N H I state
51
sets c o m m a n d l a t c h U26 p i n 5 h i g h , e n a b l i n g the sta rt d i ffe re n t i a l FET pa i r i n P r o b e A .
State 52 i s a f o rced j u m p to state 6 w h e re , i n t u rn , STO P C h a n n e l P r o b e , S TA R T S L O P E , a n d
STO P S L O P E a re d e tected a n d e n a b l ed i n t h e s a m e m a n n e r.
8-1 1 7 . States 1 5 t h ro u g h 20 se ri a l l y a c c e p t a n d l oa d the STA R T C h a n n e l v o l t a g e i n to v o l t a g e
d ri ve rs U 5 , U 2 , a n d U 4 , re s pe c t i v e l y , o n A2 D A C Asse m b l y . S t a t e s 2 1 t h ro u g h 25 dete rm i n e
a n d set t h e p o l a ri t y f o r t h e sta rt v o l ta g e . C o m m a n d LOAD STA R T v o l t a g e t o t h e STA R T
c h a n n e l S a m p l e a n d H o l d R ef e re n c e A m p l i f i e r A 1 U 8 . T h i s c o m m a n d i s repeated fo u r t i m e s i n
o rd e r to a l l o w s u ff i c i e n t t i me f o r sa m p l i n g c a pa c i t o r A 1 C5 to c o m p l et e l y c h a rg e to t h e l e ve l of
t h e a p p l ied D A C v o l t a g e .
8-1 1 8 .
S t a t e 29 e x a m i n e s A 1 U 2 1 p i n 6 to d e te r m i n e i f A5 H P- I B I n t e rface Asse m b l y h a s
req u e sted R M T C A L re m ote ca l i b ra t i o n ' . S t a t e 30 c h e c k s t h e R E M O T E q u a l i f i e r l i n e , A 1 U 2 1
p i n 3 ' . I f R E M O T E i s h i g h t h e state m ac h i n e w i l l j u m p t o state 3 3 . I f R E M O T E i s l o w , i n d i c a t i n g
l oc a l o p e rat i o n , t h e state m a c h i n e c o n t i n ue s t o state 3 1 . States 3 1 a n d 32 e xa m i n e t h e f ro n t
p a n e l l e ve l s w i t c h , to dete rm i ne i f a l e ve l c a l i b ra t i o n h a s b e e n req u e sted l oc a l l y . A l e ve l
c a l i b rate re q u e st e i t h e r re m o t e l y state 1 29 o r l o c a l l y ' state 32 w i l l e x i t to t h e c a l i b ra t i o n
s u b ro u t i n e
state 1 6 1 ' . O t h e rw i s e , t h e f l o wc h a rt c o n t i n u e s to state 3 3 a n d e xa m i n e s t h e
T I M E R q u a l i f i e r A 1 U 2 1 p i n 9 ' . T h e s t a t u s of t h e T I M E R d ete r m i n e s w h e t h e r t h e Tri g g e r L i g h t
s u b ro u t i n e i s e n t e red o r b yp a ssed . I f t h e T I M E R q ua l i f i e r i s h i g h , t h e Tr i g g e r L i g h t s u b ro u t i n e
i s b y p a ssed a n d t h e prog ra m c o n t i n u e s to state 3 4 , R E M O T E .
8 - 1 1 9 .
State 34 e xa m i n e s t h e R E M O T E q u a l i f i e r l i n e , a n d i f t r u e , b y p a sses t h e f ro n t p a n e l
s w i t c h q u a l i f i e r r o u t i n e ' states 35 a n d 36 . States 35 a n d 36 s e l e c t a n d e xa m i n e t h e A d a ta l i n e
q u a l i f i e r wh i c h l o o k s at t h e p o s i t i o n o f t h e T I M E Z E R O f r o n t p a n e l t o g g l e s w i tc h . States 3 7
t h ro u g h 50 s e r i a l l y s e l e c t a n d l oa d t h e STO P c h a n n e l v o l t a g e s a n d p o l a rity i n e xa c t l y t h e s a m e
m a n n e r a s t h e STA R T c h a n n e l . T h i s c o m p l et e s a b a s i c i d l e l o o p a n d t h e p r o g ra m n o w ret u r n s
t o state 1 to beg i n ag a i n . A s i m p l i f i ed d i a g ra m o f t h e 536 3 B m a i n p rog ra m i d l e l o o p a n d
s u b ro u t i n e s i s g i ve n i n
8 -1 20.

F l owc h a rt S u b ro u t i n e s

8 - 1 2 1 .
T h e m a i n p r o g ram i d l e l o o p c o n t i n u a l l y i n p u t s data a nd e xa m i n e s q u a l i f i e rs . Ba sed
on the q u a l i f i e r i n p u t s , the l o o p c a n c o n t i n u e t h ro u g h t h e p r o g ra m o r b ra n c h to a n y of t h e
f o l l o wi n g m a j o r s u b ro u t i n e s :
1 .
E xte r n a l P rog ra m
X - Y
2 .
Ca l i b ra t i o n
3 .
Ca l i b ra t i o n E r r o r
4 .
Tri g g e r L i g h t
5 .
T i m e Z e ro
8-28
s u b ro u t i n e . C o m m a n d L ATC H 8 state 3 a d d resses
X - Y
Fig u re 8 - 7 .
b eg i n s w i t h c o m m a n d
Fig ure 8 -9 ,
a n d
I f e i t h e r of t h e se l i n e s i s p u l l e d l o w ,
X
Y .

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