2 . 8 . 2
P r og ramm i ng I n tegra t i on T i me
I n te g ra t i o n t i me
(
I . T .
)
i s o n l y a p o r t i on o f t h e o v e ra l l mea s u re me n t
t i me o f t h e Mode l 2 1 5 0
/
2 1 6 0 . I t i s t h e va r i a b l e p o r t i on o f s a m p l e t i me
(
de s c r i be d pre v i ou s l y
)
, t h a t i s b a s e d o n t he n um b e r o f c y c l e s o f t h e
te s t f re q u e n c y . I n te g ra t i on t i me c a n be p rog rammed to a m a x i mum o f
600ms a n d t o a m i n i mu m o f 2ms .
A s a r u l e , m i n i m u m r e q u i r e d i n t e g r a t i o n t i m e i n c r e a s e s a s t e s t
f r e q u e n c y d e c r e a s e s . A l s o , s h o r t i n te g ra t i o n t i me s a re l e s s a c c u ra te
t h a n l on g e r t i me s a nd can c a u s e l e s s m e a s u reme n t r e s o l u t i o n to be
d i s p l a y e d . I f a n e n t e r e d t i m e d o e s n o t a l l ow t h e i n s t r u m e n t t o
i n t e g ra t e o n a numbe r o f comp l e te mea su reme n t f re q u e n cy c y c l e s , i t i s
a u toma t i ca l l y r e ca l c u l a t e d t o t h e ne x t l a r g e r i n te g ra t i o n t i me t ha t
doe s
(
s e e T a b l e 2 - 1 1
)
. T h i s h o l d s t r u e w h e n e i t h e r i n t e g r a t i on t i me or
te s t f r e q u e n c y i s c ha n ge d , or b o t h .
To f i n d t h e p e r m i s s i b l e i n t e g r a t i on t i me s , u s e t h e f o rmu l a :
I . T .
=
#
o f cy c l e s *
(
pe r i od / 60
)
w he r e :
#
o f cyc l e s
=
C E I L I NG
[
p r o g rammed I . T . *
(
60 / p e r i od
) ]
pe r i od
=
F LOOR
[
6 0 , O O O
/
F
]
f o r F < 1 0k H z or F
=
1 2 k H z ,
1 5 k H z , 2 0 k H z , 3 0 k H z , 6 0 k H z .
p e r i od
=
FLOOR
[
3 0 0 , O O O
/
F
]
f o r F
>
1 0k H z
(
e x c l ud i ng 1 2 k H z ,
1 5 k H z , 2 0 k H z , 3 0 k H z , 6 0 k H z
)
.
C E I L I NG
=
a f u n c t i on w h e r e , i f t h e va l u e i s a n o n - i n t e g e r ,
r o u n d i t t o t h e ne x t h i g he r i n t e g e r . I f i t i s a n i n t e g e r ,
keep va l u e .
F L O O R
=
a f un c t i on w h e re , i f t h e
r o u n d r e s u l t t o t h e n e x t l o w e r
i n t e g e r , keep va l u e .
e
l
s
l
i
2 - 9 6
2 1 5 0
/
2 1 6 0 5
/
8 5
va l u e i s a
i n t e g e r .
n o n - i n t e g e r ,
I f i t i s a n
Summary of Contents for VideoBridge 2150
Page 24: ...BLANK 1 6 e l s l i 2 1 50 2 1 60 5 8 5...
Page 230: ...R54 R 1 9 R23 6 TP8 o O NC N N N N a a a a a F i gure 5 5...
Page 252: ...A t S E C T I ON A A 4 5 0 0 m m 5 rY1 m A...
Page 307: ...Figure 8 1 General Handler Interface Circuit Assembly P N 47895 B 2 e s i 2150 2160 5 85...
Page 330: ...F i gure 8...
