Table of Contents
Advertisement
V
e
n
tilatio
n R
equireme
n
ts
T
h
ermal
P
rotection
HP 811 OA Service G
u
ide
Th e
f
oll o win g work should
b
e carr ied out by α qualified electr ic ian -
all
l
ocal electri cal codes
b
eing strictly
o
b ser ved. If
t
he plu g on the
ca ble does n ot fit the
p
o w er outlet, or th e cable is to
b
e attached to α
termin al
b
lock , cu t the cabl e at the plug en d and re- wire it .
Th e color cod ing used in the cabl e will depe nd on t he cabl e
supplied . If α new plu g is to be conn ected, it must
m
eet
l
ocal sa f ety
re qui rements an d in clude the followin g
f
eatu res :
ι Ade qu ate
l
oad-carr ying cap acit y (see tab l e of specificati on s) .
ι Groun d connect ion.
ι Ca ble cl amp.
Th e HP 8110Α
i
s fitted with
t
wo coolin g
f
an s . Make s ure th at
t here i s adequate c learan ce of 3 inches (75 mm) at the rear an d 1/2
inch (12 mm) at th e top
a
nd bottom to ensure adequate airflow .
If t he ai rflow i s restr icted t he inter nal operating temperature will
b e hig h er, reducing t he instrument's reliab ility or cau sing t he
instrument's t h ermal-protecti on
c
ircuits to automati cally s witch off
t he instrum en t .
Over
h
eati
n
g Detectio
n
The HP 8110Α
m
onitors its internal temperature in t he region
o
f the
p
ow er s upply. If the te mperature ex ceeds approxim ately 80°C, the
p
ow er s upply i s s witched off. The instrumen t will s witc h on again if
th e te mp erat u re fall s
b
elo w
a
pproximate ly 77°C .
F
an
F
ail
ur
e
If ei ther of t h e
f
ans i s
p
re v e n ted
f
rom
o
perating by α
b
lockage, or
th e
p
o wer s upply to the
f
ans is interr upted, the
p
ower supply is
autom at i cally s wi tc hed off wit hin 3 to 4 seconds.
N
ote that after t he
f
aul t co n dit i on h as been fix ed, t he instrument must rem ain switched
off
f
or at l east 2 minutes to allow th e detect ion
c
ircuit to recover.
I
n
stalling t
h
e HP 811 0Α
1-3
Advertisement
Table of Contents
