Fig . 3 -1 8; Fig . 3 -3 1; Fig . 4 -1 2; Fig . 4 -2 3 - Viavi 3900 Series Operation Manual

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7. 5. 6. B. 9
S NR M eter
Th e A F S N R M e te r m ea su re s th e sig n al to n o ise r atio of a n a ud io s ou rce . T he M o d ula tio n
SN R M e ter m ea su re s t he sig n al t o n ois e rat io o f a ra dio tr an sm itt er. Th e AF a nd
M od ula tio n SN R M et es ar e e na b led us in g th e No is e M e te rs S o ft K ey o n th e An a lyz ers o r
M ete rs T ile.
7. 5. 6. C
M eter C omp o ne nts
7. 5. 6. C. 1
M eas ur emen t Rea do u t
Th e m ea su re m en t re su lts ar e d isp la ye d a s a d ig ital rea do u t at th e to p rig ht o f t he m et er
pa ne l. F o r s om e m ea su re m en ts su ch as A M D ep th , th e p os itiv e a n d n eg a tive va lu es of
th e m e as ur em e nts a re giv en .
7. 5. 6. C. 2
Bar G ra ph s
Th e Ba r G ra p h is a sin gl e, li ne ar ind ica to r th at pr ov ide s a v isu al me a su rem e n t re ad ing
ba se d on a us er de fin ed sc al e. U p pe r a nd lo w er lim it in dic at ors a re s e t on s ys tem
C on figu ra tio n T ile s.
7. 5. 6. C. 3
S cal e
Th e s ca le of th e b ar gr ap h is s ele cte d fro m the S c ale d ro p- do wn m en u. A va ilab le s ett ing s
ar e A u to- ran g ing (A u to) or a fixe d va lu e. Th e se lec te d s ca le va lu e is d isp la ye d b e low th e
ba r g ra ph .
7. 5. 6. C. 4
P eak (P k ) Hol d
Se le ctin g the P ea k Ho ld bu tto n allo w s th e pe ak v alu e of m e a su rem e nt s to b e c ap tu re d
an d up da te d a s ne w pe ak s oc cu r. T he p ea k v al ue is sh ow n on th e b a r g rap h an d in th e
Pe a k d igi tal rea do u t fie ld.
7. 5. 6. C. 5
P eak M e asu re men t
Sh o ws th e pe ak v alu e fro m the b ur sts m ea s ure d. Th e pe a k re a din g ca n b e re se t b y u sin g
eit he r th e P ea k R es et AL L S oft K ey , w h ich re se ts a ll m e as ure m e nts o r b y us ing t he P ea k
R es et S of t K e y to r es et a n in div id ua l m e a su rem e nt s el ec ted fro m th e s of t k e y m en u. T h e
re se t o pe rat ion a lso re se ts t he pe a k re a din g on th e b ar gr ap h.
7. 5. 6. C. 6
M in i mi ze Bu tton
Th is bu tto n s el ec ts t he m et er f or dis pla y on th e m in im ize d Til e. U p to 3 me te rs ca n b e
dis pl ay ed o n the m in im ize d dis pl ay : a w ar nin g ap pe a ring if m or e tha n thr ee a re se le cte d.
Th e inf orm a tio n s ho w n o n th e m in im ize d dis pla y for ea ch m e as ure m e nt is re du c ed w he n
m ult iple m ea s ure m en ts ar e s ele ct ed .
7. 5. 6. C. 7
P eak R ese t A LL S oft Ke y
R es ets a ll ac tiv e p ea k ho ld lev els to ze ro .
7. 5. 6. C. 8
P eak R ese t S oft Key
D isp lay s a s oft ke y s ub -m e nu th at res et s th e pe ak h old o n a s pe cific m e ter or m ete rs .
7. 5. 6. C. 9
Au tos cal e AL L S o ft Key
Se ts al l m ete r b ar gr ap hs to A uto -ra n gin g.
7. 5. 6. C. 10
Au tos cal e S o ft Key
D isp lay s a s oft ke y s ub -m e nu co n tain in g s of t ke ys th at se t th e ba r g rap h on a sp ec ific
m ete r o r m e te rs t o A u to- ran g ing .
A n al og D up le x S y st em
7 - 56

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