Viavi 3900 Series Operation Manual page 191

6. 5. 4. B n/ d iv
Th is dro p -do w n m e n u s ele ct s th e ve rtic al s ca le of the tr ac e. T h e s ca le ca n als o b e
inc re as ed o r d ec rea se d us ing th e Ex pa n d/C o ntr ac t S oft Ke ys . T he s ca le un it o f
m ea su re m en t c ha ng es a cc ord in g to ty pe o f m e as ure m en t b e ing pe rfo rm e d.
6. 5. 4. C Co up l in g
Th e Co u plin g dro p -do w n m e n u s ele ct s h ow th e sig na l is co n ne cte d to the T es t S et.
AC
DC
G ND
6. 5. 4. D P os iti o n
Th e Po si tion fie ld ad jus ts the v ert ica l p os ition o f tra ce o n the d isp lay fie ld.
6. 5. 4. E Ti me / d iv
Th e Tim e /d iv d ro p- do wn m e nu se ts th e S co p e's time ba se re pe titio n . Th e tim e ba se
re pe titio n r ate s ett ing ca n be in cre as ed o r d ec re as ed by u sin g the E xp an d or Co n trac t
So ft Ke ys .
6. 5. 4. F Tr ig g er Ho ri zo nta l P o si ti on
Th e Tr igg er H ori zo nta l P o sitio n fiel d is e na bl ed w he n Ch a nn el 1 o r Ch an n el 2 is s ele cte d
as th e S o ur ce for Tr ac e A /B .
6. 5. 4. G Tr ig g er S o ur ce
Th e Tr igg er dr op -do w n me n u s ele c ts th e Tr igg er so ur ce as T rac e A, Tr ac e B o r th e
Ex te rna l T rig ge r S ig na l In pu t C o nn ec to r.
6. 5. 4. H Tr ig g er L eve l
Th e Le ve l fie ld se ts a v olt ag e o r p e rce nt va lue fo r th e tra ce trig ge r le v el. T h e t rigg e r le ve l
po in t is ind ica te d b y a g re en T L fl ag on th e left of the d isp lay .
6. 5. 4. I Tr ig g er M o de
Th e T rigg e r M o de to gg le b utt on s ele cts th e T rigg e r m o de o f o pe ra tio n. Whe n N O RM A L is
se lec te d t he tra ce is trig ge re d w h en th e trac e pa ss es th ro ug h t he Tr igg er Le ve l v alu e .
Whe n AU T O is se lec te d th e tra ce fre e run s at t he ra te de ter m ine d by th e T im e /div
se ttin g.
6. 5. 4. J Tr ig g er E d ge
Th e Tr igg er Ed g e to g gle b utto n se lec ts ho w th e tr igg er is ac tiva te d. W he n R IS IN G is
se lec te d t he tra ce trig g ers w he n the tr ac e p as se s the tri gg er lev el as it in cre a se s in
va lue . Wh e n F A LL IN G is se lec ted th e tra ce trig ge rs w he n t he tra ce p as se s t he trig ge r
lev el as it d ec re as es in va lue .
6. 5. 4. K Tr ig g er F i lte r
Se le cts a mo u nt of n o ise , if a n y, to b e filte red fro m th e trig ge r p ath .
N o R e jec t
No is e R e jec t
H F R e jec t
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R a di o T e st Ins tru me nt s
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S ig na l is co nn ec te d d ire ctl y to th e Te st Se t.
S ig na l is gr ou nd ed ; G N D is typ ica lly us ed to se t a re fe ren ce .
N o no ise is filte re d f rom trig ge r p ath .
F ilte rs m ed ium l ev el n o ise fro m trig ge r p a th.
F ilte rs Hig h Fr eq ue nc y no ise fro m tri gg er pa th.
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