S Pe Ctr Um A Na Ly Ze R T Ile La Yo; Fie Ld D Efin Itio - Viavi 3900 Series Operation Manual

6.4.3 Spec tr um A nalyz er Ti le L ayou t
Th e Sp e ctru m A na ly ze r is alw a ys dis pla y ed as a fu ll tile . T he m ajo rit y o f th e pa ram e te r
fie lds ar e a va ila ble o n t he m ain d isp lay tile ; o th ers a re av aila ble b y p re ss ing th e so ft
ke ys .
6.4.4 Fi eld De fi ni ti on s
6. 4. 4. A 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 .
6. 4. 4. B S cal i ng dB /d i v
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.
6. 4. 4. C RF I n (S o u rce )
Th e RF In to gg le bu tto n se lec ts the R F Inp ut co nn e cto r (s ign a l so ur ce ).
6. 4. 4. D RBW (R eso l uti o n Ba nd wi d th) T og g le B utto n
Th e RB W t og gle b utt on se le cts th e R B W b an dw id th m od e of o p era tio n. Whe n Au to is
se lec te d, RB W is s yst em d ef ine d to a v alu e ap pr op ria te t o th e sig na l ty pe b ein g
dis pl ay ed . Whe n M a nu a l is se le cte d, a dr op -d ow n m e nu be c om e s a cce s sib le w hi ch a llo w s
us er to se lec t fr om th re e d e fine d ba nd w idt h s et ting s. Th is tog gl e b ut ton is link ed to th e
R es BW (R es olu tio n Ba nd w idt h) So ft K e y w h ich ca n als o b e us ed to d efin e the R B W
se ttin g wh ich fu nc tio ns in the s ame m an n er.
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R a di o T e st Ins tru me nt s
F ig. 6-2 3 S pe ctr um A n aly ze r T ile
6 - 21