Viavi 3900 Series Operation Manual page 168

6. 3. 2. 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. 3. 2. 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. 3. 2. 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 b elo w sh o ws a n R F sig na l d is pla ye d fro m 1 49 .0 M H z to 15 1 .0 M Hz a s de fin ed b y
th e S ta rt a nd S to p v alu e s.
R a di o T e st Ins tru me nt s
F ig. 6- 11 C ha n ne l A na lyz er St art an d Sto p Fr eq ue n cy Se ttin g
6 - 10