BATTERY CHARGING
TABLE 1
To apply full charge to the batteries, connect the instru
ment to a power line, turn SCOPE POWER and DMM
POWER off, switch the Power Source Selector switch to
AC FULL CHG position, and allow at least 16 hours for the
batteries to become fully charged. To obtain the longest
Operating life for the batteries, the instrument should be
turned on at least once a month and the batteries dis
charged to where the oscilloscope SCOPE POWER LED
flashes, and then recharged for 24 hours. This procedure
balances the charge on the batteries and reduces the
possibility of any cell becoming reverse charged The
instrument may be operated while batteries are being
charged.
The energy capacity of nickel-cadmium cells varies with
the temperature at which they are charged and operated.
Table 1 shows the percentage of full charge capacity at
various charging and operating temperatures.
Battery charge related to
operating temperature and charging temperature.
Charging Operating Temperature
Temperature -1 5 ° C +20° to +25" C
♦55s C
0°C
40%
60%
50%
♦20° to +25° C
65%
100%
85%
*40° C 40%
65%
55%
BATTERY CARE
Nickel cadmium cells will self-discharge when the instru
ment is not used often or stored for extended periods of
time. The rate of self-discharge is dependent upon tempera
ture and humidity. When the instrument is to bo stored for
extended periods of time, particularly at high temperature
or humidity, the batteries should be charged for at least
16 hours every two weeks, or leave the 305 connected to a
power line with the Power Selector switch set to AC
TRICKLE CHG position.
<®
305 Operators
5
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