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SECTION
2
Gefting Started
material between the bottom of the unit and
the surface underneath
.
Another vent i s lo-
cated on the top panel of the unit. Be
careful
not to block
the
top vent by placing an object
on top of the unit.
Avoid mounting two or more
units
verti-
cally. Placing one unit
on
top of anotherwill
obstruct the vents.
2 . 3
LlNE POWER SUPPLY
The Model 3910 operates with a 100V, 120V, 220V, or
240V
zklO%, 48
to 62Hz, single-phase AC power supply.
The power consumption is approximately
25VA.
2.3.1
LINE Voltage Selector Switch
The LINE voltage selector switch on the rear panel allows
you to change operating voltage of the power supply.
The standard setting of the switch
is
the same as the volt-
age available in the country to which the unit
is
shipped.
To change the power
supply
voltage, first disconnect the
line cord, and set the supply voltage switch in the correct
position. Wait at least five seconds before
turning
the
power back on after turning it off.
WARNING
To avoid a shock hazard, disconnect the
power cord from the instrument before
changing the supply voltage setting.
CAUTION
Be sure to set the line voltage switch to the
correct position for the line power voltage to
be used. Operating the instrument on an in-
correct voltage may cause damage to the unit.
2.3.2
line Receptacle Connection
Connect the supplied power cord to the rear panel Line
receptacle and to a grounded AC power receptacle sup-
plying the correct voltage.
WARNING
The Model
391 0 is
equipped with
a
3 - w e
power cord that contains a separate ground
wire and is designed to be used with
grounded outlets. When proper connections
are made, instnunent chassis is connected to
the power line gmund. If the AC outlet is not
grounded,
the
rear panel ground terminal
@
must be connected to safety earth
ground using #18AWG (or larger) wire be-
fore
use.
2 . 3 . 3
Line Fuse
The
line fuse, which is integral with
the
power
line recep-
tacle, protects the instrument from over-current situ-
ations. To replace the fuse, first disconnect the h e cord,
then pry out the fuse compartment (immediately to the
right of the
FUSE marking)
with a small screwdriver. A
spare fuse
is
located in the compartment with the fuse be-
ingused. Replace the blown fuse only with the type listed
in Table 2-1, then replace the fuse holder.
WARNING
To avoid a shock hazard, disconnect the line
cord from
the
instrument before replacing
the
fuse.
CAUTION
Use only a fuse of the rating listed in Table
2-1,
or inshument damage may occur.
Table 2-1. Fuse Replacement
Line Voltage
Rating
Part No.
lOOV, 120V
FU-96-2
220,240V
FU-96-2
NOTE Fuses
are 5 x
20mm and
have 2SOV, normal blow ratings.
2.4
HANDLING PRECAUTIONS
When the front panel or case becomes dirty, dean it with
a soft cloth.
If
the panel or case is too dirty for cleaning
with a dry cloth, dampen the cloth in mild detergent, and
wipe the panel or case with the damp cloth. Never
w e
solvents such
as
thinner or benzene, or chemical dust
cloths to avoid damaging the case or front panel surfaces.
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