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SECTION 2
Getting Started
2.3
An air intake port is provided
on the rear
panel of the unit. Allow
a space of at least
four inches between
the rear panel and a
wall or other obstruction.
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.
Avoid mounting
two or more units vertically
(for example, when using two or more units
synchronously).
Placing one unit on top of
another will obstruct the exhaust port.
Dust collecting
in the fan filter will prevent
sufficient
air flow. In a clean operating envi-
ronment,
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.
Immediately
turn off the power to the unit if
the fan ceases to operate. Operating
the in-
strument with an inoperative
fan may result
in damage to the instrument.
LINE POWER SUPPLY AND
GROUNDING
2.3.1
Line Power Supply
The Model 3933A operates with lOOV, 12OV, 22OV, or
24OV, &lo%, 48 to 62Hz, single-phase AC power supply.
The power consumption is about 38 VA.
Line Voltage Selector Switch
The Line Voltage Selector switch on the rear panel allows
you to change the operating voltage of the power supply.
The standard setting of the switch is the same as the volt-
age 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
2-2
position. Wait at least five seconds before turning the
power back on after turning it off.
WARNING
Disconnect
the power cord from the instru-
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-
correct voltage may cause damage to the unit.
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 3933A 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
must be connected to safety earth ground us-
ing #lSAWG
(or larger) wire before use.
LineFuse
The line fuse protects the instrument from over-current
situations. To replace the fuse, first disconnect the line
cord, then unscrew the center cap with a small screw-
driver. Replace the blown fuse only with the type listed in
Table 2-1, then replace the fuse cap.
WARNING
Disconnect
the line cord from the instru-
ment before replacing
the fuse.
CAUTION
* Use only a fuse of the rating listed in Table
2-1, or instrument
damage may occur.
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