Viavi 3900 Series Operation Manual page 293

8. 2. 2. A Tr k Ge n T og g le B utto n
Th e Tr k G e n To gg le B utto n tu rns th e Tra ck in g G e ne ra to r O n an d Of f. W he n t he T rac kin g
G en er ato r is O N , e ithe r th e M 1 o r A 1 G en er ato r is u se d t o p ro du ce th e T ra ck ing
G en er ato r O ut pu t sig na l. Wh en the Tr ac kin g G e ne ra tor O u tp ut S o urc e is se t to M o d, M 1
is u se d to g e ne rat e th e T rac kin g G e ne ra tor O u tp ut si gn al. Wh en t he T ra ck ing G en er ato r
O utp u t S ou rc e is se t to A F , A 1 is us ed t o ge ne ra te th e Tra ck in g G e n era to r O u tpu t sig na l.
If A 1 or M 1 is a lrea d y e na b led , th e Tra ck in g G e ne ra tor sig na l o ve rrid e s th e sig na l
cu rre nt ly c on fig ure d on th es e ge ne ra tor s.
8. 2. 2. B S pa n Dr op -Do wn Me nu
Th e Sp a n d ro p-d o wn m e nu is e n ab led w he n the S im ul ca st A n aly sis O pt ion (3 90 X OP T 21 0)
is i ns talle d in the T es t S et. S pa n se lec ts t he h oriz on ta l sc al ing of th e p lot ted s ign al.
O nc e S p an is se lec te d, the S top F re qu en cy F ield c an be u se d t o f oc us on a sp ec ific
se cti on o f th e sig na l. Fo r e xa m ple , Sp an c an b e se t to 9 .6 kH z, th en th e Sto p F req ue n cy
ca n be ad ju ste d to 1 0 0.0 H z. Th e m ax im um S to p Fre q ue nc y i s d efi ne d b y the S pa n
va lue .
8. 2. 2. C Tr ack in g G en er ato r S ou rc e
Th e Tr ac kin g G e ne ra to r S ou rc e d ro p-d o wn m e nu se le cts th e o ut pu t s ou rce o f th e
Tr ac kin g Ge n era to r si gn al.
Whe n AF is se le cte d, the T ra ck ing G en e rat or O u tp ut sig na l is ro ute d to t he T es t S et's
Fc tn G EN /D e m od O ut C on ne cto r.
Whe n M O D is s ele ct ed , th e T ra ck ing G e ne ra tor O utp ut sig na l is ro ute d th rou gh th e
m od ula to r to th e se lec ted R F O ut Co nn e cto r (G E N o r T /R) .
8. 2. 2. D Tr ack in g G en er ato r Le vel
Th e Tr ac kin g G e ne ra to r L ev el d e fine s the T rac kin g G en er ato r O u tpu t s ign a l lev el .
3 90 0 O pti on al Fu n cti on s
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