Viavi 3900 Series Operation Manual page 231

7. 4. 10 .A .2 RF Ana ly z ers Lev el Offs et
Th e RF A n aly ze r L ev el Of fse t a cc ou nt s fo r a lo ss or ga in to be ins er ted in to the R F pa th
be tw ee n the 3 90 0 rec ei ve r in pu t C on n ec tor (A NT (A n te nn a) Co n ne cto r o r T /R C on ne c tor.
Th e O ffse t v alu e is in d ica ted in + dB fo r p os itiv e (g a in) va lue s. Whe n a p o sitiv e va lue is
en te red , E x t G ain is dis pl ay ed to th e ri gh t o f th e R F A na lyz er s L ev el O ffse t v alu e fiel d.
Th e O ffse t v alu e is in d ica ted in -d B for ne ga tiv e ( los s) va lue s. Whe n a n e ga tive v alu e is
en te red , E x t Lo ss is dis pl ay ed to th e ri gh t o f th e R F A na lyz er s L ev el O ffse t v alu e fiel d.
NOTE
7. 4. 10 .A .3 Dx F req u en cy Of fset
D x F re qu en cy O ffs et allo w s the fre q ue nc y s p ac ing b etw e en th e RF G e ne ra tor an d the R F
An a lyz er t o b e s et . A p o sitiv e v al ue se ts t he R F G e ne ra tor to a hig h er f req u en cy tha n the
R F A n aly ze r s ett ing . V alu e sp ec ifie d in M H z, kH z or Hz a s d ef ine d b y us er .
NOTE
7. 4. 10 .A .4 RF G en Offs et M od e
R F G e n Of fse t M o de L oc ks or Un lo ck s th e fre qu en cy sp a cin g b e tw ee n t he R F G e n era to r
se ttin g an d t he R F A n aly ze r s ett ing . With th e se ttin g s et to Lo ck th e R F G en e rat or
fre qu en cy fo llo ws a ny ch an g e to th e RF A na ly ze r se ttin g w ith a s pa cin g eq ua l to th e Dx
Fr eq ue nc y Of fse t v alu e.
7. 4. 10 .A .5 AF G en er ato r Atten ua ti on
Th e AF G e ne ra tor At ten ua tio n dro p -do w n m e n u a llo ws th e u se r t o a pp ly an o ffse t th a t
co m pe ns a tes fo r a us er su pp lie d e xt ern al att en ua tio n c on n ec ted to th e F C T N/G E N
D em o d O u t C o nn ec tor .
7. 4. 10 .A .6 Ge n O ffset S o ft Key
Th e G en O ffs et S o ft K e y c on tro ls t he us e of the R F G en era to r L ev el Of fse t v alu e.
O N in se rts the d efin ed R F G e ne ra tor L e ve l O ffse t in to th e R F Pa th be tw ee n th e s e lec ted
39 00 g en e rato r o u tpu t c on ne ct or an d t he de vi ce un de r t es t.
O FF re m ov es th e de fine d R F G e ne ra tor Le ve l O ffs e t fro m th e R F P ath b etw e en th e
se lec te d 3 9 00 ge n era to r o utp ut co nn e cto r a nd th e d e vic e u n de r te st.
7. 4. 10 .A .7 An a Offs et S oft K ey
Th e An a O ffse t S o ft K ey c on tro ls th e us e of t he R F A n aly ze rs Le ve l O ffs et va lue .
O N ins er ts th e de fin ed R F An al yze rs Le v el O ff se t in to t he R F P a th be tw ee n the s ele cte d
39 00 re ce iv er inp ut co nn ec to r a nd th e d ev ice u nd e r te st.
O FF re m ov es th e de fine d R F A n aly ze rs Le ve l O ffs et fro m the R F Pa th b etw e en th e
se lec te d 3 9 00 re ce ive r in pu t c on ne c tor an d t he d ev ice un d er tes t.
A n al og D up le x S y st em
Wh e n a n offs e t is en ab led , a n off se t in dic ato r a pp e ars b es ide th e
p ow e r fie ld o n t he An a lyz ers Til e a nd in th e up pe r le ft ha n d c orn e r of
th e C ha nn el An al yz er T ile .
Wh e n a n offs e t is en ab led , a n off se t in dic ato r a pp e ars b es ide th e
o ut pu t le ve l e ntry fie ld on th e G e n era to rs T ile .
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