SECTION 5
PRINCIPLES OF OPERATIONS
5-1. In tro d u c tio n
T his c o u n te r c o n sists o f a ce n tra l m ic ro p ro c ess o r, tw o L S Is ,a d isp lay IC ,a n d
an in p u t c irc u it. T he c e n tra l m ic ro p ro c e ss o r c o n tro ls th e tw o LSIs fo r m e as
u re m e n t, processes th e o b ta in e d d a ta , a n d ro u te s th e p ro ce ssed d a ta to th e
d isp lay IC o r th e e x te rn al in te rfa c e circ u it. It also co n tro ls th e p an el sw itch es
an d ch an ges th e m ea su re m en t fu n c tio n a cc o rd in g to th e in fo rm a tio n fro m th e
p a nel. T h u s, th e in stru m e n t is o p e ra te d c om p le te ly u n d e r c o n tro l o f th e
m ic ro p ro c esso r. T h is c o u n te r also h as a self-d iag n ostics fu n c tio n b y m ean s o f
th e m ic ro p ro c ess o r its e lf. F ig ure 5-1 sh ow s th e b lo c k diagram .
5-2. O p e ra tio n o f E ac h B lo ck
5-2 -1 . I n p u t C ircu it
T h e in p u t circ u it sh apes a n y sign al to b e m e asu re d in to a w av efo rm so th e
su b se q u en t logic circ uits ca n o p e ra te c o rre c tly . A C -A U T O -D C , S E N S .,
F IL T E R , L E V E L , S E P ./C O M . A , SL O P E are p ro v id ed fo r th is p u rp o se .
(1 ) A C -A U T O -D C
W h en th e w av efo rm a t p o in t A in F ig ure 5-1 is as sh o w n b elo w , th e w ave
fo rm is s h ap ed as o n th e rig h t side o f th e figu re a cc o rd in g to A C -A U T O -
D C se le ctio n . A C re je cts th e D C c o m p o n e n ts , A U TO su pp resses th e DC
c o m p o n en t a n d au to m a tic a lly sets th e trigg er p o in t a t th e 50% level o f
th e a m p litu d e , a n d DC se nd s th e in p u t w av efo rm as it is to th e S c h m itt
trig ger circ u it.
Point A
'J U L .
AC
Point B
n
AU TO
OV
7 v T
DC
—
-----
Trigger po in t is
set m anually.
0V
0V
T V T
Trigger poin t is
set autom atically.
AC
AUTO
DC
f U L
ov
s /t
Trigger p o int is
set m anually
5-1
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