WARNING I
Change o f ac voltage must be accomplished by
qualified service personnel.
AC Power Source Operation
The AC Input Voltage Selector switch permits the 305
to be operated from a 115 or 230 volt ac nominal line volt
age source, at 48 to 440 hertz I Figure 1) The Power Source
Selector switch must be set to the proper AC position. The
ac line voltage fuse must be changed when selecting a dif
ferent nominal line voltage. Any fuse change requires re
moval of the instrument cabinet and must be accomplished
by qualified service personnel.
INTERNAL BATTERY OPERATION
WARNING I
Change or replacement of batteries must be accom
plished by qualified service personnel
I ne jud teatures oattery operation irom six recuarye-
able nickel-cadmium cells (1.2 volts each, total nominal
voltage of 7.2 Vdc). The operating time of the internal
batteries depends upon display intensity, state of battery
charge, discharge temperatures, and the instrument function
being used; oscilloscope, DMM, or both. When the instru
ment is operated at +20°C to +303C (+C8 F to +86°F),
the typical operating time of fully charged batteries with
both oscilloscope and DMM in operation is approximately
1.6 hours.
A light-emitting diode (LED), labeled 'ON (FLASHES
WHEN LOW)', is steadily illuminated to indicate that the
instrument oscilloscope function is on, and the battery
charge is sufficient for operation. When battery charge is
low, the LED flashes on and off indicating that batteries
require recharge or possible replacement. An automatic
battery over-discharge protection circuit will turn the instru
ment off to prevent excessive discharge, which could result
in permanent battery damage.
During DMM operation, the digital readout alternates
between a normal display and---------------if the power
source voltage drops too low for proper DMM operation.
4
305 Operators
REV A SEP 1979
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