Tektronix 454A - Controls & Connectors

Oper at i ng I nst r uct i ons- 454AI R454AzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
‘ t h er m al cut out i n
t h i s i nst r u ment pr ovi d es t h er mal
p r ot ect i o n and d i sco nn ect s t h e p
ower
t o
t h e i nst r u ment i f
t h e i nt er nal t emper at ur e
excee d s ± saf e o p er at i ng l evel .
O p e
r at i on
of
t h e i nst r u ment f or ext en d e d p er i o d s wi t h out
t h e cover s may cause i t t o over
h eat a nd t h e t h er mal c u t out
F i g . 2- 2 . L i n e V ol t age
Sel ect o
r
assemb l y on t h e r ea r panel ( s h ow n  t o open mor e f r e q ue n t l y . T h e ai r f i l t er s
h
o u l d be
cl eane d
wi t h cover r emove d ) .

occasi onal l y t o al l ow t h e maxi m u
m amou n t of cool i n g ai r
t o e n t er t h e i n st r u m ent . Cl ea
n i ng i nst r u ct i ons ar e gi ven i n
Sect i o n 4 .
TA BLE 2- 1
Reg u l at i ng Ra n
ges
Reg u l at i n g Ra n ge
R ange Sel ect or

115 V ol t s

230 V ol t s
S w i t c h P osi t i on

Nomi nal

N omi nal
LO ( swi t c h bar i n

90 t o
110
vol t s

180 t o 220 vol t s
l ef t h ol es}

_
œ ( swi t ch bar i n  104 t o 126 vol t s

208 t o 252 vol t s
mi d d l e h ol es)
—™ ( swi t c h b ar i n

112 t o 136 vo I t s

224 t o 272 vol t s
r i g h t h ol es)
5 . R e- i nst al l t h e cove r and t i g h t en t h e t w o capt i ve
sc r e w s .
6 . B
ef or e appl yi ng p ower t o t h e i nst r u
m
ent ,
c
h
ec
k
t
h
at
t h e i n d i cat i ng t abs on t h e swi t c h ba r s ar e p r ot r u d i n g
t
h
r ou g
h
t
h
e cor r ect h ol es f or t h e d esi r e d nomi nal l i ne
vol t age an d r eg u l at i ng r ange .
2- 2 .
connect t h i s i nst r u m ent t o ± t wo- wi r e AC p ower syst e m , be
sur e t o co nn ect t h e gr oun d l ea d of t h e a d a p t er t o ear t h
( gr ou n d ) . F ai l ur e t o com p l et e t h e gr oun d syst em may al l ow
t h e c h assi s of t h i s i nst r ument t o be el evat e d ab ove gr o u n d
p ot ent i al an d p ose ± shoc k h azar d .
O p er at i n g Te mp e r at ur e
Th e 454 ‘ i s cool e
d by ai r d r awn i n at t h e r ear a n d
b l own o u t t h r o u g h hol es i n t h e t o p an d bot t om cover s .
Ade q uat e cl ear ance on
t h e t op, b ot t om an d r ea r mu st be
p r ovi d e d t o
al l ow
heat t o be d i ssi pat e d away f r om t h e
i nst r ume
n t .
T
h e cl ear a n ce p r ovi d e d by t h e f eet at t h e
b ot t o m an d r ear s h oul d be mai nt ai ne d . I f p ossi bl e, al l ow
a b o u t o n e i nc h cl ear ance on t h e t o p . Do not bl ac
k
or
r est r i ct t h e ai r f l ow f r om t h e ai r esca p e h ol es i n t h e cabi net .
T h e 454 ‘ can
b e oper at e d wh e r e t h e a m bi ent ai r
t em p er at u r e i s bet ween
- - 15 ° C an d +55 ° C . T h e maxi m um
o p
er at i n g t e m p er at ur e m ust b e B er at e d 1 ° C f or eac h
a dd i t i onal 1000 f eet of al t i t ude a b ove 5000 f eet . T
h
i s
i nst r u m ent can b e st or e d i n ambi ent t e mp
er at ur es b et ween
- 35 ° C and . +75 ° C . Af t er st or age at t em p er at u r es beyond
t h e o p er at i ng l i m i t s, al l ow t h e c h assi s t emper at ur e t o co m e
wi t h i n t h e o p er at i ng l i m i t s bef or e power i s appl i e d .
O p er at i ng P osi t i o n
T h e ha n d l e of t h e 454‘ can be p osi t i oned f o r car r yi n g
or as ± t i l t - st an d f or t h e i nst r ume n t . To p osi t i o n t h e h an d l e,
p r ess i n at bot h p i vot p oi nt s ( see F i g . 2- 3) an d t u r n t h e
h
an d l e t o t
h
e desi r e d posi t i on . F o u r t een posi t i ons ar e
p r ovi d ed f or co n ven i ent car r yi ng or vi ewi ng . T h e
i nst r u ment m ay al so be set on t h e r ear f eet ei t h er f or
oper at i o n or st or age .
R ackmount i ng
Com p l et e i nf or mat i on f or mo u nt i ng t he R 454A i n ±
cab i net r ac k i s gi ven i n Sect i on 6 of t hi s m a n u al .
Th i s i nst r u me n t m
ay 6e
da
m aged i f
op erat e d
wi
t h t
h
e
L i ne Vol t age Sel ect or asse m bl y set t o i nco r r ect

CO N TRO L S A N D CO NN E CTO R S
posi t i ons f o r t he l i ne vol t age appl i ed .
Gener al
T h e 454 ‘ i s d esi gned t o b e u sed wi t h ± t h r ee- w i r e AC

‘ br i ef d escr i p t i o n of t h e f
un
ct i on an
d oper at i on of t h e
p ower syst e m . I f t he t h r ee- t o t wo- wi r e a d apt er i s used t o

f r on t - , si d e- an d r ear - pane l cont r ol s an d connect or s f ol l ows
.