Lim It; U Pp Er Lim Its - Viavi 3900 Series Operation Manual

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3 .9
LI M I TS
39 00 T e st Sy ste m s co nta in a va rie ty of C on fig ura tio n Tile s to allo w th e us er to d efin e an d
en ab le up pe r a nd low e r lim it p as s/fa il p ara m et ers . T he dis pla y is co nf igu re d to co lor -co de
m ete r r es ults to e as ily id e ntif y w h eth er or no t m e as ur em e nts a re wit hin an e xp ec te d
ra ng e.
R ED
G RE E N
B LU E
3.9.1.
Up p er L imi t s
Th e UP P E R LIM IT fu n ctio n se ts a m a xim u m ac ce pt ab le rea d ing fo r a sp ec ific
m ea su re m en t. W he n a m ea su re d lev el ex ce ed s the e n ab led U P P ER L IM IT , t he M e ter B ar
an d rea d ing b ac kg rou n d o n the M e as ure m en t T ile s t urn s RE D .
Whe n re ad ing s are w ith in e n ab led U pp e r a nd Lo w er lim its, th e M e te r B ar an d r ea din g
ba ck gr ou nd o n t he M ea su re m en t T ile s tu rn s G R E EN .
An U pp e r Li mi t va lue m u st b e gre at er t ha n t he va lue d efin e d in th e L ow e r L im it fie ld, ev en
if th e Lo w er Lim it i s n ot en ab le d.
Fo r e xa m pl e, i f th e T /R In ba nd P o we r U p pe r a nd L ow e r Li mi t va lu es on th e RF L im its
C on figu ra tio n T ile a re bo th 0 .0 dB m (d efa u lt va lue s) , to s et T /R In ba nd P ow er Up pe r L im it
va lue to - 7 5 dB m :
ST E P
1.
S et T /R In ba n d L ow e r L im it V al ue to a v a lue le ss tha n -75 d Bm , for this e xa m ple
us e - 10 0 dB m .
2.
S et T /R In ba n d U p pe r L im it V al ue to -7 5 d B m.
Te st Se t O p er at ion
in di ca tes a m ea su re m en t h as ex ce ed e d th e de fin ed u pp er lim it v alu e.
ind ic ate s a m e as ur em e nt is w ith in de fin ed up p er an d l ow er lim it v alu e s.
in dic ate s a m e as ur em e nt is b el ow th e de fine d low e r lim it va lue .
F ig . 3 -25 A n alo g Du pl ex - L im its En ab le d
3 - 30
P ROC EDU RE

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