Viavi 3900 Series Operation Manual page 62

3. 3. 1. A AC P o wer Con n ecto r
Th e AC P o we r C o nn ec to r a cc ep ts an IE C 32 0 co nn ec to r. R ef er to 3 9 00 P latf orm
Sp e cific at ion s f or the re qu ire d su pp ly v ol tag e, fre qu en cy a nd p ow er co ns u mp tio n
sp ec ific atio n s.
3. 3. 1. B AC P o wer Fu se
Th e AC F u se s a re ac ce ss ed fr om th e rea r p a ne l by re m ov in g th e fus e co ve r lo ca te d
ab ov e the A C P ow er .
R efe r to A pp e nd ix C , Fu se R ep la ce me n t P roc e du re for ins tru ctio n s o n rep la cin g A C
Po w er Fu se .
3. 3. 1. C AC P o wer Su p pl y S w itc h
Th e AC P o we r S u pp ly Sw itc h iso late s the 3 90 0 from the A C po w er su pp ly.
Th e A C P ow e r Su pp ly S w itch s h ou ld no t be u se d fo r po w erin g d ow n th e T es t S e t b e ca us e
all se ttin gs an d tes t re s ults a re l os t.
Th e O n /S tan d by K e y sh o uld be us ed for r ou tine po w er d ow n of u nit b ec a us e it in itiat es a
po w er- do w n p ro ce du re , s av ing a ll cu rre nt se ttin gs a nd te st r es ults .
R efe r to s ec tion s title d P o we rin g Te st Se t O n an d Po w er ing T es t S et Do w n in C h ap te r 3
fo r ad d ition a l inf orm a tio n.
3. 3. 1. D Rea r Co ol i ng Ou tl ets
Th e Re a r F an V en ts pro vi de air cir cu lati on to the T es t S et . Im p rop e r ve n tilat ion m ay
ca us e the T es t S et to ov erh e at a n d m a y d a m ag e in te rn al c om p o ne nts .
3. 3. 1. E I F Ou tp ut S i gn al Co nn ec tor
Th e IF O utp ut Si gn al i s a va ilab le at thi s B N C co nn ec to r. T he 1 0.7 M H z I F O u tp ut is th e
R F s ign a l re ce ive d an d d o wn -c on ve rte d b y the T es t S et R F A n aly ze r.
Th e ou tp ut l ev el is -1 0 dB m ty pic al at 1 0 .7 M H z (5 0 O h m n om in al) .
NOTE
3. 3. 1. F E xt Ref I / O E xte rn al I n terfa ce
Th e E xte rn al R ef ere n ce I/O C on ne c tor is a B N C c on ne ct ion u se d to co nn ec t t he T e st S et
to an e xte rn al fr eq ue n cy sta nd a rd, or to ou tpu t th e int ern a l fre qu en cy s tan da rd fro m th e
Te st Se t t o o th er eq uip m en t.
R efe r to s ec tion tit led F req u en cy R efe re nc e T ile in Ch a pte r 4 fo r in fo rm atio n on p rop e r
Te st Se t c on fig ur atio n .
3. 3. 1. G Au di o I n pu t Co nn ecto r
Th e Au d io I np ut Co n ne cto r is in ter na lly c on n ec ted a nd re ad y for fut ure d ev elo pm e n t. D o
no t m a ke a ny ex te rna l c on ne cti on to thi s c on ne ct or.
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Te st Se t O p er at ion
T he 1 0. 7 M H z IF OU T s ign al is s pe ctr ally in ve rte d. An R F sig na l
r ec eiv ed b y th e Te st Se t, d o wn -c on ve rte d t o 1 0 .7 M H z , th en o utp ut
o n th is s oc ke t ha s t he p ro pe rty tha t a f req ue n cy in cr ea se or a ph as e
a dv an c e a t R F is o u tpu t a s a fr eq ue nc y r ed uc tio n o r p h as e
r eta rd atio n a t IF . T a ke t his in to a c co un t if us ing this ou tpu t fo r wo rk
w ith a ny typ e of FS K /P SK s ign al ing .
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