Viavi 3900 Series Operation Manual page 180

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6. 4. 4. 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 .
6. 4. 4. F
S we ep T o gg le Butto n
Th e Sw e ep to gg le bu tto n se lec ts t he S we e p T im e m od e of o p era tio n. Whe n Au to is
se lec te d, the S w ee p T im e is s ys te m de fin ed to a va lue a pp ro pria te to the s ign al typ e
be in g d isp la ye d. Whe n M an ua l is se le cte d, a dro p- do w n m e nu b ec om e s ac ce ss ible w h ich
allo w s u s er t o s ele c t fro m a list of d e fine d Sw e ep T im e s et ting s. Th is tog g le b u tton is
link e d to th e Sw e ep T im e S o ft K ey w hi ch ca n a ls o b e us ed to de fin e the S w ee p T im e
se ttin g wh ich fu nc tio ns in the s am e m an n er.
6. 4. 4. G
(S pa n) M o de
Th e Sp a n M o de d rop -d ow n m en u se lec ts the s pa n mo d e u se d to de fin e th e dis pla y ed
sig na l tr ac e. Av aila b le o p tion s are S ta rt-S to p M o de , C e nte r -S p an M o de an d Ze ro-S pa n
M od e.
6. 4. 4. G .1
S tart - S to p S pa n M o de
St art -S top S p an M o de u se s th e sw e ep S ta rt an d S top f req ue n cie s to de fin e th e sp an . Th e
ex am p le be low s ho w s a n RF s ign al dis pla ye d fro m 14 9. 95 M H z to 1 50 .05 M H z a s de fin ed
by th e S ta rt a n d S to p va lue s.
R a di o T e st Ins tru me nt s
F ig. 6 -2 4 Sp e ctru m A na ly ze r S tar t a nd S top F req u en cy S ett ing
6 - 22

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