Channe L Anal Yz Er; Basi C Set T In Gs; Fie Ld D Efin Itio Ns - Viavi 3900 Series Operation Manual

6 .3

CHANNE L ANAL YZ ER

Th e Ch a nn el An al yze r is a n a sy n ch ron ou s , sw e pt an aly ze r th a t di sp lay s th e sp ec tru m of
th e R F sig na l r ec eiv ed b y th e Te st Se t o ve r a 5 M Hz b an dw id th ce nte re d on th e R x
fre qu en cy . T he so ur ce of t he sig na l fo r th e C h an ne l A na lyz er is th e r ec eiv er ch ain of the
Te st Se t.
R efe r to 3 90 0 Pla tfo rm S pe c ifica tio ns fo r th e C h an ne l A n aly ze r's op er atin g pa ra m ete rs .
NOTE
6.3.1

Basi c Set t in gs

Th e fre qu en cy s pa n o f th e dis pl ay m us t in clu de th e RF F re qu en cy b ein g e xa m in ed . T he
R efe re nc e L e ve l of the d isp la y m u st b e se t s o t ha t th e R F si gn al l ev el f alls w ithi n th e
dis pl ay ar ea . T he C ha nn e l A na lyz er Tile c an be u se d in m in im ize d or m ax im ize d vie w.
6.3.2 Fi eld De fi ni ti on s
6. 3. 2. 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. 3. 2. 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. 3. 2. 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. 3. 2. 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 am e m an n er.
6. 3. 2. E V BW (V i d eo Ba nd w id th ) T o gg l e Butto n
Th e VB W t og gle b utt on se le cts th e V B W b an dw id th m od e o f o pe ra tio n. Whe n A u to is
se lec te d, VB W is sy st em d ef ine d t o a v alu e ap pro p riat e to 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 t o s ele ct fr om a l ist o f de fin ed ba nd w idt h se ttin g s. T his tog g le b utto n i s lin ke d to the
Vi d B W ( Vid eo B an d wid th ) S of t K ey w hic h c a n a lso b e u se d to de fin e th e V BW se ttin g
w hic h f un ctio n s in th e s am e m a nn er .
R a di o T e st Ins tru me nt s
T he C ha nn e l A n aly ze r sh a res the R F p ath fro m t he co nn ec to r to th e
r ec eiv er. Th e ref ore th e C h an n el A n aly ze r is de p en de nt on th e
r ec eiv er for co nn ec to r s ele ctio n , gl ob al a tte n ua tion a nd C en te r
F re qu en cy (w ith in +/- 2. 5 M H z of the re ce ive d C en ter Fr eq ue nc y) .
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