Battery Replacement - Tektronix 222 Operator's Manual

More On How It Works-222 DSO Operators
Leave the battery on charge for
24
hours. If it still does not accept a
charge, remove it from the instrument and attempt to charge it using a
20 V power supply that is current limited to 100 milliamperes. When
attempting to recover the battery using an external power supply,
check the battery frequently for the current-limit state. If the battery
recovers from the deep-discharge state, it will pull the power supply
into current limit. When this happens, reinstall it in the instrument and
charge it normally. Do not leave the battery on the external power
supply for long periods of time without checking it. If the battery does
not recover, dispose of it safely.
4.
When storing the instrument for an extended period of time, fully
charge the battery and remove it from the instrument. Store the fully
charged battery in a cool place. For short periods of storage, the
battery may remain installed. During "sleep" mode the current drawn
from the battery is less than 1 mA. With the battery installed, the data
stored in nonvolatile memory will remain stored and be available
when the oscilloscope is turned on again.
5.
The instrument will operate from the battery-charger adapter or
other suitable ac or dc power source with the battery removed from
the instrument.
6.12 ALTERNATE METHOD FOR BATTERY CHARGING
Batteries may be charged outside the instrument using the External
Battery Charger accessory (see section
7
for part number) or a user
provided dc power supply. The lead-acid cells of the batteryrequire a
constant charging voltage as provided by the External Battery
Charger accessory. An alternate charger must supply 9.8 Vdc at 20°C
with the supply current limited to 1 ampere. For best results over a
wide temperature range, the charging voltage should be thermally
compensated for -10 mV per degree C. For example,at 50°C , the
charging voltage should be:
6.1 3 BATTERY REPLACEMENT
If you must often operate the oscilloscope using battery only, you may
wish to obtain one or two extra batteries and carry them in a fully
charged condition to the servicing site. Spare batteries may be car-
REV SEP 1989 6-15