Viavi 3900 Series Operation Manual page 286

8. 2. 1. C Au di o A nal y z er T il e L ayo u t
Th e Au d io A n aly ze r c an b e v iew e d i n m in im ize d an d m ax im ize d v ie w. So ft K e ys on th e
rig ht sid e o f th e dis pla y pro v ide ac ce ss to se ttin g s n ot av aila b le o n the m a in t ile.
NOTE
8. 2. 1. D Fi el d / So ft Key Defi ni ti o ns
8. 2. 1. D. 1 Refe ren ce L ev el
Th e Re fe re nc e L e ve l se ts the to p va lue o n th e dis pla y gra p h. Po w er lev els ca n be
m ea su re d a t a ny p oin t o n the tra ce in co n jun ctio n w ith t he S ca ling d B/ div se ttin g. Th e
R efe re nc e Le ve l ca n be s et to a ny v alu e w ith in th e sp ec ifie d ran g e. Th e R ef ere n ce L ev el
is s e t by :
•
U sin g t he E xp an d an d C o ntr ac t S of t K ey s to m a ke st ep ch an g es .
•
S ele ctin g the d ata fie ld an d us ing th e Ro ta ry Co nt rol Kn ob to a dju st the le ve l.
•
S ele ctin g the d ata fie ld an d us ing th e Da ta E ntry In pu t K e ys to en te r sp e cific
lev el .
8. 2. 1. D. 2 S cal i ng dB
Th e Sc al ing dr op -d ow n m en u se lec ts from a r an ge o f 1, 2, 5, or 1 0 . T he sc ali ng va lu e
(d B/d iv ) ca n the n be in cre a se d o r d ec re as ed u sin g t he E xp an d or Co nt rac t S of t K ey s.
8. 2. 1. D. 3 I np ut S o ur ce
Th e Inp u t S ou rce d ro p-d ow n m e nu se le cts D em o d o r A u dio a s th e filte re d s ign al so ur ce .
Whe n a f ilte r is se lec ted , t he sig n al s ou rc e is ro ut ed th rou g h th e se lec te d f ilter . F ilter
se lec tio n is m a de on the A na lyz er s Til e of t he a c tive op er atin g A n alo g s ys tem . Wh en the
Tr ac kin g Ge n era to r is en ab le d, us er de fine d filte rs are n ot av aila b le.
8. 2. 1. D. 4 S tart
D efin es th e sta rt f req ue n cy of the fre q ue nc y s pa n . T he m ax im um sp an is 0 to 2 40 00 H z;
ho riz on ta l sc ale v alu es m us t b e wit hin th is r an ge .
3 90 0 O pti on al Fu n cti on s
S o m e o f th e im ag es in th is s ec tio n s ho w op tio n e n ab led fie ld s.
T he s e fie ld s a re no t v isib le un le ss the a pp lica b le o p tion is ins ta lled
in th e Te st Se t.
F ig . 8 -2 Au d io A n aly ze r T ile - M a xim iz ed V iew
8 - 2