ESI VideoBridge 2150, Service Manual

Page: 85 / 332

2 . 5 TEST S I GNAL
T h e t e s t s i g na l , a p p l i ed to t he de v i ce u n d e r te s t , i s a s i nu s o i da l
wa ve f o rm d e r i ved f rom a d i g i ta l s ou r c e .
I t i s programma b l e b o t h i n
f reque n c y a nd i n ma g n i t u d e f r om e i t h e r t he f ro n t p a n e l k e y bo a rd or
remo t e l y v i a an I E E E - 4 8 8 o r RS- 2 3 2 C i n te r fa ce b u s .
W h e n pow e r i s
a p p l i e d , t he i ns t r ume n t ' s f re q u e n c y a nd v o l t a g e l e ve l i n i t i a l i z e t o
1 0 0 0 H z a n d 1 0 00mV RMS , r e spe c t i ve l y .
NOTE :
Be c a u s e u s i n g vol tage or c u r ren t t e s t s i g na l s a t t h e i r
l ow e x t remes p r o d u c e s a l ow s i g na l - t o- n o i s e ra t i o ,
me a s u r e me n t a c c ura cy a t t h e s e l ow l e ve l s may be se r i ou s l y
d e ra t e d . A l s o , f e w e r d i g i t s w i l l b e d i s p l a y e d per mea su r em e n t .
2 . 5 . 1
Frequency
T h e Mod e l 2 1 5 0 /2 1 60 h a s ove r 3 0 0 0 s e l e c ta b l e t e s t f requen c i e s be twe e n
2 0 H z a n d 1 5 0 k H z .
A l l f requen c i e s a re a c c ura t e t o w i t h i n + /- 0 . 0 1 % .
W h e n powe r i s a p p l i ed , t h e i n s t rum e n t ' s te s t f requ e n c y i n i t i a l i z e s t o
1 0 0 0 H z . A l l f re qu e n c i e s a re e n t e red d i re c t l y i n he r t z ( H z ) .
E xa m p l e :
Push
S e t t he i n s t r umen t ' s t e s t f r e q u e n c y t o 1 00 H z .
Di splay
1 0 0 . 0 It O I1 :
1 0 0 0 I1 V c O i n
S E T L : O O S O I1 S I N T G R = 0 5 0 I1 S A V E = O I
A U T O B I A S D F F
99 . 803 n F cs
. 000 1 5
D
H Z
2 - 4 6
e l s l i 2 1 5 0 / 2 1 6 0 5 /8 5
Comments
To a l l ow t h e t e s t
s i g na l t o s ta b i l i z e
a f te r a f re q u e n cy
c ha ng e , wa i t 2 00 m s
be f o re i n i t i a t i ng a
mea s u reme n t .
•