Viavi 3900 Series Operation Manual page 183

6. 4. 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 lef t/rig ht arr ow k ey s m o ve th e tra ce
rig ht or l eft on th e d isp la y fi eld , w hic h sim u lta ne ou sly a dju sts th e Ce nt er an d/o r S ta rt
Fr eq ue nc y, d ep e nd ing on t he s p an m o de se lec te d. T he Ex pa nd /C o ntr ac t S o ft Ke y s ad ju st
th e s pa n of t he tra ce , w h ich ca n als o be ad ju ste d by ch an gi ng th e S p an se ttin g .
6. 4. 5. C Fi n d S o ft K ey
Th is s oft k ey i s ac ce ss ed by p re ss ing the Ho riz on tal S o ft Ke y. P re ss ing the Fin d S of t K e y
sw e ep s t he Te s t S et's a va ilab le fre qu en cy ra ng e an d se ts C e nt er F re qu e nc y to h igh e st
sig na l p ea k alo ng fre q ue nc y r an ge .
6. 4. 5. D Fu l l S p an S o ft Key
Th is so ft k ey is ac ce ss ed by p res si ng th e H o rizo n tal S o ft K e y. P re ss ing F ull Sp a n s et s
th e S ta rt - St op sig na l s pa n to the T es t S et' s fr eq ue nc y ran ge .
R a di o T e st Ins tru me nt s
Adjust Center/Start Frequency
F ig . 6- 28 S pe ct rum An aly ze r H o rizo n tal Se ttin gs T ile
6 - 25
Adjust Span