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SECTION 2
Getting Started
four inches between
the rear panel and a
wall or other obstruction.
l
An exhaust port is provided
on the bottom
panel of the unit. Install
the unit on a rigid,
flat surface, and avoid installing
it on soft
material
such as a cushion. Be careful not to
insert foreign
material
between the bottom
of the unit and the surface underneath
. An-
other exhaust port is located on the top panel
of the unit. Be careful not to block the top
port by placing an object on top of the unit.
l
Avoid
mounting
two or more units
verti-
cally. Placing one unit on top of another will
obstruct the exhaust port.
l
Dust collecting
in the fan filter wilt prevent
sufficient
air flow. In clean operating
envi-
ronments,
wash the filter with a mild deter-
gent every three months.
When operating
the unit in a dusty environment,
wash the fil-
ter with
a mild
detergent
at least once a
month.
l
Immediately
turn off the power to the unit if
the fan ceases to operate. Operating
the in-
strumentwiththefaninoperativemayresult
in damage to the instrument.
2.3
LINE POWER SUPPLY
The Model 3930A operates with a lOOV, 12OV, ZOV, or
24OV SO%, 48 to 62Hz, single-phase
AC power supply.
The power consumption
is 41VA.
2.3.1
LINE Voltage
Selector
Switch
TheLINEvoltageselectorswitchontherearpanelallows
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 hnning
it off.
WARNING
Disconnect
the power cord from the instrn-
ment 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-
correctvoltagemaycausedamageto
theunit.
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 3930A is equipped
with a 3-wire
power cord that contains a separate ground
wire
and is designed
to be used with
grounded
outlets. When proper connections
are made, instrument
chassis is connected to
the power line ground. If the AC outlet is not
grounded,
the rear panel ground
terminal
0
must
be connected
to safety
earth
ground using #18AWG
(or larger) wire be-
fore use.
2.3.3
Line Fuse
The line fuse, protects the instrument
from over-current
situations.
To replace the fuse, first disconnect
the line
cord, and unscrew the fuse carrier from the fuse holder.
Replace the blown fuse only with the type listed in Table
2-1, then replace the fuse holder.
WARNING
Disconnect
the line cord from the in&u-
ment before replacing
the fuse.
CAUTION
Use only a fuse of the rating listed in Table
2-1, or instrument
damage may occur.
2-2
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