2-3
PREPARATION FOR USE
Preparation for use consists of checking that the rear panel line volt-
age selector switch is set for the correct line voltage and connecting the
sweep generator to the power source. The following paragraphs provide
these procedures along with information about power requirements,
warmup times, and the operating environment.
Power
Requirements
The sweep generator accepts 90 to 132 Vac and 180
to 264 Vac, 48 to 400 Hz, single-phase power. Power
consumption is 400 VA maximum.
Line Voltage
Selection
The line voltage selector switch on the rear panel
can be set for either 110 Vac or 220 Vac operation
(Figure 2-1). When the switch is set to 110 Vac, the
681XXB accepts 90 to 132 Vac line voltage. When
the switch is set to 220 Vac, the 681XXB accepts 180
to 264 Vac line voltage. If the selector setting is incor-
rect for the line voltage available, change it to the
correct setting.
Whenever the selector setting is changed, the line
fuse must be changed to the correct value for the
line voltage selected. Line fuse values for the line
voltages are printed on the rear panel next to the
fuse holder.
CAUTION
To avoid possible equipment damage, the instrument cabinet
should be grounded. Always use a three-wire power cable
connected to a three-wire power line outlet to power the
681XXB.
Power
Connection
Connecting the 681XXB to line power automatically
places it in operation (front panel
OPERATE
LED
on). To connect it to the power source, plug the fe-
male end of the power cable into the input line volt-
age receptacle on the rear panel (Figure 2-1). Then
plug the male end of the power cord into a three-
wire power line outlet.
PREPARATION
INSTALLATION
FOR USE
2-4
681XXB OM