Viavi 3900 Series Operation Manual page 265

7. 5. 6. B. 3 Di sto rti on M eter
Th e AF D is tor tion M e ter mea su re s th e am o un t o f a ud io dis tor tio n a ra dio re ce iv er m a y
ad d to a n au dio s ign al d u ring th e d e m od ula tio n p ro ce ss . T he M od ul atio n Dis to rtio n Me te r
m ea su re s th e am o un t o f a ud io dis to rtio n c re ate d by a rad io tra ns m itte r w he n an a ud io
sig na l is m od u late d . Th e se m et ers a re e n ab led u sin g the N ois e M ete rs So ft Ke y o n the
An a lyz ers o r M e ter s T iles .
7. 5. 6. B. 4 FM De vi ati on M eter
Th e FM D e via tio n M e te r me as ure s the a m ou nt of de via tio n p re se nt on an F M M od u late d
R F S ig na l re ce ive d by th e 3 9 00 . T he F M De v iatio n m ea su re m en t is dis pla y ed on th e
An a lyz ers a nd M et ers T iles .
FM RM S M e ter
Th e FM R M S M e ter is s el ec ted fro m th e FM D e m od M ea su re m en t m e nu o n t he M od
M ea su re m en ts Co n figu ra tion T ile .
FM Pk -P K /2 M e te r
Th e FM P K -P K /2 M e te r is se lec te d f rom t he F M De m o d M e as ur em e nt m en u o n the M o d
M ea su re m en ts Co n figu ra tion T ile .
7. 5. 6. B. 5 Hu m & Noi se Me ter
Th e AF H um & N o ise M ete r m e as ur es th e a m ou nt of hu m an d n o ise a r ad io rec eiv er may
ad d to the a ud io sig na l d urin g the d em o du la tion p ro ce ss . Th e M od ula tio n Hu m & N ois e
M ete r m e as ure s th e le ve l of h um a nd no ise cre a ted by a ra dio tra ns m itte r wh en an au dio
sig na l is m od u late d . Th e A F a nd M o du lat ion H um & N o ise M e ters a re en ab le d u sin g the
N ois e M e te rs So ft K e y o n the A na lyz er s o r M e te rs T ile s.
7. 5. 6. B. 6 P ow er M e ter
Th e Po w er M ete r m e as u res th e a m pl itud e of an R F S ig na l re ce iv ed at the T /R o r A NT
C on ne cto r. Whe n the A N T C o nn ec to r is se lec te d a s the R F Inp ut , th e P o we r M e te r
dis pl ay s th e In b an d p ow e r o f the re ce ive d R F S ign al. T h e In b an d P ow e r M e ter m e a su res
th e s tre ng th of an y s ign a l pr es en t w ith in the ra ng e of the se le cte d IF Ba nd w idt h F ilte r.
Whe n t he T/R C on n ec tor is se le cte d a s th e R F Inp u t, th e P ow e r Mete r c an be co nfig u red
to dis pla y Br oa db an d or Inb a nd P ow e r m ea su re m en ts .
In ba nd /B ro ad B an d T og gl e B u tto n
Th is bu tto n t og gle s be tw ee n Inb an d an d Br oa db an d Po w er m ea su re m en ts. Th e Inb a nd
Po w er m ea su re m en t fu nc tio n i s a va ilab le w he n e ith er th e A N T (A nte nn a ) C on ne ct or or T/
R C o nn ec to r is s ele cte d f or R F Inp ut . Th e In b an d/B ro a db an d T og g le B ut ton is o nly ac tive
w he n t he T /R Co n ne cto r is se le cte d as th e R F In pu t s ou rce .
7. 5. 6. B. 7 RF F re qu en cy O ffset ( w he n n ot A utotun ed )
Whe n the M a nu al m eth od o f s etti ng th e R F in pu t le ve l is se lec ted o n the A na lyz er s T ile ,
th is fie ld ind ic ate s t he d iffer en ce b etw e en th e R F in pu t s ign al an d the d efin ed tu n ed
an al yze r f req u en cy .
Th e Fr eq ue nc y Of fse t b ar gra p h h as a ce nt er ze ro for po siti ve or ne ga tiv e r ea din g s. T h e
Sc a le d ro p-d o wn m e nu se le cts se ttin g .
Th e Un its dr op -d ow n m en u s e lec ts t he un it o f m e as ur e u se d to dis pla y F re qu e nc y O ffs e t
m ea su re m en ts.
7. 5. 6. B. 8 S in ad M eter
Th e AF S in ad M et er me a su res th e rec eiv e qu alit y o f a ra dio re ce ive r. Th e Mo d ula tio n
Si na d M e te r m e as ure s the s ina d of a tr an sm itte r. Th e AF a nd M od u latio n Si na d M e te rs
ar e e na b led u sin g t he N ois e M e te rs So ft K e y o n the A na lyz e rs o r Me te rs T ile s.
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