Viavi 3900 Series Operation Manual page 291

8. 2. 1. E Au di o A nal y z er T rac e Li mi ts
Au d io An a lyz er Tr ac e lim its al low s us e rs to se t v isu a l lim its a bo ve a n d be low the d e sire d
ta rge t le ve l. T his fu nc tio n a llow s th e u se r to q uic kly de te rm ine if t he sig n al re c eiv ed fro m
th e U U T falls w ith in a d es ire d t arg e t lev e l ra ng e.
8. 2. 1. E . 1 Li mi ts O n/ O ff T o gg l e Bu tton
Th e L im its O n/O ff T og gle B u tton e n ab les th e A ud io A na lyz er u pp er a nd lo we r sig na l t rac e
lim its .
8. 2. 1. E . 2 Li mi ts V al u e
Lim it tra ce po s ition is de fin ed b y e nt erin g a v al ue in the L im its Va lue fie ld . U pp er an d
low e r lim it tra ce s a re o ffse t f rom the s ign al by th e va lue d efin e d in th e Lim it s V a lue fie ld.
Fo r e xa m pl e, i f th e L im it V a lue is se t to 5. 0 d B , th e U p pe r T ra ce is po siti on ed 5 .0 d B
ab ov e the s ign al an d the L ow er Tr ac e i s p os itio ne d 5.0 d B b e low th e sig na l.
8. 2. 1. E . 3 Usi n g S to red Tr ace w i th T rac e Li mi ts
Th e St ore T ra ce fun c tion c an be u se d i n c om b ina tio n wit h T ra ce L im its t o e va lu ate
m ult iple rad io s th at o p era te wit hin the sa m e s pe c ifica tio ns . To co n figu re the Te s t Se t fo r
Au d io L im its A na lys is:
ST E P
1. C ap tur e a n d S to re a b a se line s ign al trac e .
2. D efin e th e L im its V a lue an d s et L im its to ON to es tab lish a ta rg et u pp er a n d lo we r
lim it.
3. P res s t he C lea r S o ft K ey to re m ov e t he sto re d sig na l tra ce (u p pe r a nd lo we r
Lim it s re m a in).
4. Tr an sm it sig na l fro m U U T t o T e st S e t. A dj us t U UT u nt il sig n al is w ith in d e fine d
tra ce lim its of ba se lin e s ign a l tra ce .
3 90 0 O pti on al Fu n cti on s
F ig . 8 -7 Au d io A n aly ze r - Tra ce L im its En ab le d
P ROC EDU RE
8 - 7