Er Ror Ve Ctor Magnit Ude Tile - Aeroflex 3900 Series Option Manual

Er r o r V ec t o r M a g n i t u d e T i l e
The Er ror Vect or Magnitu de ( EV M) gr aph plots the a verage adjust m ent co mpensatio n value s the
Test Set appl ies to the rece ived sign al to match the signal to t he exp ected points along the burst .
Er ror Vect or Magni tude ( EV M ) is a measur e of t he dif fer ence bet ween the act ual signal and an id eal
signal. T he di ffer ence mea sured betw een signals is calcula ted a s a p ercent and plott ed o n the
gra ph on a symbol by symbol basis.
Mk r 1 a nd M kr 2
O N/O FF
E n a b l e s ( O N ) o r D i s a b l e s ( O F F ) v e r t ic a l m a r k e r s o n t h e d i s p l a y f i e l d .
Ho ri zonta l P osit ion
T h e w h i t e d a t a f i e l d t o t h e r i g h t o f t h e O N / O F F b u t t o n i n di c a t e s t h e m a r k e r ' s l o c a t i o n a l o ng
t h e d i s p l a y f i e l d ' s h or i z on t a l s c a l e . T h e m a r k e r s c a n b e p l a c e d a t a n y p o i n t a l o n g t h e
h o r i z o n t a l s c al e .
EV M Re adin g
T h e f i e l d t o t h e r i g h t o f t h e H o r i z o n t a l P o s i t io n f i e l d i n d i c a t e s t h e E V M r e a d i n g a t t h e
m ar k e r ' s p os i t i o n f o r e a ch e n a b l e d c h a n n e l ( C H 1 t h r o u g h C H 4 ) . T h i s f i e l d i s r e a d o n l y a n d
c a n n o t b e a l t e r e d b y t h e u se r . T h e v a l u e i s i n d i c a t e d a s a p e r c e n t a g e a n d i s o n l y
d i s pl a y e d f o r e n a b l e d c h a n n e ls .
H P D ® B a s i c S y s t e m O p e r a t i o n
F i g. 2 - 2 2 E r r o r V e c t o r M a g n i t u d e - M i n i m i z ed V i e w
F i g . 2 - 2 3 E r r o r V e c t o r M a g n i t ud e - M a x im i z e d V i e w
2-18