Tektronix 1502C Battery Charging, Low Battery

Operating Instructions
1502C MTDR User Manual 1–3
The battery pack will charge fully in 16 hours when the instrument is connected,
via the power cord, to an AC power source with the instrument turned off. The
instrument may be turned on and operated while the batteries are charging, but
this will increase the charging time. For longest battery life, a full charge is
preferred over a partial charge.
For maximum capacity, the batteries should be charged within a temperature
range of +20° C to +25° C. However, the batteries can be charged within a
temperature range of 0° C to +40° C and operated in temperatures ranging from
–10° C to +55° C.
CAUTION. Do not charge battery pack below 0° C or above +40° C. Do not
discharge battery pack below –10° C or above +55° C. If removing the battery
pack during or after exposure to these extreme conditions, turn the instrument off
and remove the AC power cord.
The battery pack should be stored within a temperature range of –35° C to
+65° C. However, the self-discharge rate will increase as the temperature
increases.
If the instrument is stored with the battery pack installed, the battery pack should
be charged every 90 days. A fully charged battery pack will lose about 12% of its
capacity in three to four months if stored between +20° C and +25° C.
If the battery is low, it will be indicated on the LCD (bat/low). If this is the case,
protective circuitry will shut down the 1502C within minutes. Either switch to
AC power or work very fast. If the instrument is equipped with a chart recorder,
using the recorder will further reduce the battery level, or the added load might
shut down the instrument.
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1 avg 500 mr500 ft
bat/low 0.00 ft
Low Battery
Indicator
Figure 1–2: Display Showing Low Battery Indication
Battery Charging
Low Battery