Viavi 3900 Series Operation Manual page 192

6.5.5 Sof t K ey D ef in it io ns
6. 5. 5. A Tr ace A /T ra ce B S o ft K eys
Th e Tr ac e A a nd T ra ce B so ft k ey s a cc es s ad diti on al s of t ke ys th at ad ju st s ca lin g a nd
po sit ion ing o f Tra c e A an d T ra ce B. Th e u p/ do wn a rro w k ey s m o ve the sig n al tr ac e u p o r
do w n o n the d isp la y, s im ult an eo us ly ad jus tin g t he P os itio n v alu e. Th e Ex p an d/C o ntr ac t
So ft K ey s ad ju st the he igh t of th e sig na l tra ce , w h ich c an a ls o be c ha n ge d us ing the n /d iv
dr op -do w n m en u.
6. 5. 5. B Ho ri zon tal S oft Ke y
Th e Ho riz on ta l S oft Ke y ac ce ss es a gro u p o f s oft ke ys th at a d jus t th e ho rizo n tal sca lin g
an d po siti on of the s ign al on th e g ra ph fie ld . T he ho riz on ta l sc ale c an be a dju st ed us in g
th e E xp a nd /C on tra ct So ft K e ys or by ch a ng ing th e Tim e /d iv s et ting . Wh en th e
Ex p an d/C o nt rac t S of t K ey s a re pr es se d t he T im e/d iv va lue is sim u ltan e ou sly u pd ate d .
R a di o T e st Ins tru me nt s
F ig. 6-3 5 O sc illo sco p e T ile - V e rtica l S e tting s
Adjust Horizontal Scale
Fig . 6 -3 6 Sc op e Ex pa n d/C o ntr ac t S oft Ke ys
6 - 34