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OPERATING
PRELIMINARY INFORMATION
Safety Information
Sect io n
1-7 61 3/R7 6 13 Operators
IN ST RU CT IO N S
pins wh
ich
rep resent the desired regulating range. Se lect a
range wh ich is centered abou
t
the ave rage I
i
ne volta
ge
to
wh ich the inst ru m ent is to be connected (see Table 1-1).
Th
is instru ment
h
as been
d
esigned and te st ed according
to In
ternational
E
lectrotechnical
Commission (IEC
) Pub-
Iicat io n 348
"
Safety Requ
irements
fo
r Electronic Meas-
u
ring
Apparatus" ,
and has been supplied in safe condit
ion .
T
h is inst ruc ti o n manu al contains some infor mat ive and
warning tex
ts
wh
ich th
e
u
ser
must
foll o w
t
o ensu
re
safe
o
pe ration
an
d t
o retain
t
hi s inst ru me nt in safe co ndi ti o n.
T
his instrum ent
m
eets
t
he req u irem en t s o
f
Safety C
lass I
apparat us.
AC Power
Sources. Th
is
instrum
ent
is
intend ed
t
o be
ope
rated from a sin
gle-phase ea
rt h-refe renced
pow er so
u ree
hav
ing
one
cu
rrent-ca rrying conductor (the Neutral
Co
n-
ducto
r )
near ea
rth
po t e nt ial.
Operat ion fr
om po
we r
sourees
wh ere
both
cu rren t-carrying
conductors
are
live w
ith
respect to
earth
(suc h as
phase-
to
-phase o
n a
t
h ree-w ire
system) is not reco m m end ed,
since
on
ly
the
Li
ne Con
-
ductor has
over-current
(f use) protect
ion
w
ithin
the instru
-
ment
.
AC Power Cord. This instrument has a
three-wire
power
cord with a
three-terminal
polarized plug for connection to
the power souree and safety-earth. The safety-earth
ter-
minalof the plug is directly connected to the instrument
frame. For electric-shock protection
,
insert this plug only in
a mating
outlet
with a safety-earth contact or otherwise
connect the frame to a safety-earth system. The
color-
coding of the co
rd
conductors is in accordance with
recognized
standards.
TABLE 1-1
Regulating
Range
and Fuse Data
Pins
Regulating Range
Selected
110-volts nominal
220-volts nominal
LOW
90 to
110
volts
180 to 220 vo
lts
MED
99to 12 1 volts
198 to 242 volts
Hl
10 8 to 132 vo
lts
218 to 262 volts
Lin
e
Fuse
3
.1
A
slow-blow
1.6 A slo w-b lo w
To co nvert
fr
o m
11 O-volts t
o
220-vo lts
nom
inal
line
voltage, o
r vic
e versa , rem ove
t
h e vol t age-se lect or jumper
and replace it
wi
t h
t
h e spare jum per (st o red on pins
adjace
nt
to
vol t age
se
lec tor
area ).
The ju m pers are
color-coded
t
o ind icat e the no m inal voltage fo r wh
ich
they
are intended
;
brown for 11
O-volt
nom
inal
operation and red
for
220-volt
nominal operation. Change the line fu
se
to
provide proteetion fo
r
the selected nominal line voltage.
Use the fuse located in the ALT FUSE hol der on th
e
Rectifier board (see
Fig.
1-1) or see Table 1-1 for
value.
Also, change the line
-cord
plug to match the power-s
ouree
receptacle or use a suitable adapter.
Operat ing
Temperature
The 7613 ca
n
be operared where the ambient air
temperature is between
O°C
and
+50°C.
This inst ru ment
can be stored in ambient tempe
ratu res
between -55°C an
d
+75°C.
Af ter storage at temperatures bevond the
operatin g
limits
,
allow the chass
is
temperature to come within the
operating
limits
before power is applied
.
Fig.
1-1.
Location of Voltage-selector
jumper,
spare jumper, and
230 V fuse in power-unit (shown removedl.
I
Power Cord
Conductor
Identification
Conductor
Color
Alternate Color
Ungrounded (Line )
Brown
Black
Grounded
(Neutral
)
Blue
White
Groundi
ng
(Eart hi ng)
Gree
n-Yellow
G
reen -Yellow
The
761 3
can
be op
erated fr
o m e
it he r
a
110-vo lt
o
r
a
220
-vo lt nominal
line-voltage source .
In
additi on,
t
hree
o
perating
rang
es
can be
selected
w
ithin
each
nomin
al
lin
e
voltage sou
rce .
The voltage-selector jumper on th
e Rec
t ifier
board
(se e
Fig.
1-1)
allows sele
cti on
of t
he ope
rat ing
voltage. To
convert the inst rum ent fr
om o
ne
regul ati ng
range
to ano t h
er,
first di
sc onn eet
th
e instru m en t
fr
o m
t
he
po
we r
so
u rce. Then, slide
o
ut th
e po
we r unit
as des
c ribe d
in
t
h e
Mainte na nce
sect
ien
of
the Se
rvice m
anu al. Remove
t
he vo
ltage-selec tor
jum per and re-in st all it on the set of
+15 V Fuse
AL T
,fuse
Spare jumper
REV
. D,
AUG. 1977
1-1
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