Tektronix 222 Operator's Manual page 23

Getting Started-222 DSO Operators Manual
If
the charge level of the battery is less than about
20%,
the instrument
will not come on without the external power provided by the battery-
charger adapter. Typical worst-case operating time for an instrument
with fully charged batteries is two hours at normal room temperature
with the AUTO TIMEOUT feature turned off.
One or two charged batteries may be carried in optional pouches that
attach to the carrying case for extended use away from an ac power
source. See Section 6, para 6.13 for the battery removal and replace-
ment instructions.
An external-power-on indicator (
kLJ
)
appears in the upper right cor-
ner of the readout when external power is on. The battery is charging
anytime external power is being supplied and will charge while the
instrument is operating. However, the battery charges faster when the
instrument is not operating. Completely recharge the battery as soon
as possible after each discharge cycle.
Refer to Section 6, para 6.1
1
for tips on battery care to extend the
operating lifetime of the battery.
When storing the instrument for periods longer than two
months, fully charge the batteries; then remove the batteries
and store them in a cool place. Storing partially discharged
batteries for an extended time or in high temperatures can
deplete the remaining charge, leading to a deep-discharge
condition. Refer to Section 6 , para 6.11 for information on
restoring a deep-discharged battery.
2.5 FIRST TIME BAITERY OPERATION
The battery supplied with the oscilloscope is charged at the factory
and shipped unplugged to preserve its shelf life. However, the state
of battery charge at the time you receive it will be unknown. It is
recommended that you charge the battery for three hours before
operating the oscilloscope the first time.
REV JUN 1989 2-3