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Owner's Information
A fully charged pair of battery packs typically allow more than 10 days of operation using the following
duty cycle: HP-75D and HP 82 718A running a program for 1 hr /day, with the wand in use 20% of the
time, and the modem in use 5% of the time. Note that this is based on the charge level of the batteries,
room temperature (25 C), and the typical operating current requirements shown in the above table.
The HP 82718A battery packs are charged by connecting the HP-75 to the ac adapter/recharger. Turn
the HP-7 5 off (press
[SH I FT] [ATTN])
before connecting the unit to a power outlet. This will prevent
unexpected voltage "spikes" from disturbing the contents of the electronic disc.
When the HP-75 is
connected to a power outlet, the HP 82718A uses the battery packs only as a backup power supply and
normally doesn't draw any power from the batteries.
You won't damage the HP 82718A by using it without one of its two battery packs (see the caution
below), but you will only be able to use it for half as long between charges.
I
CAUTION
I
The HP 82718A must have at least one battery pack installed at all times
to guarantee proper operation.
Be sure to keep a battery pack in the
section of the battery compartment that is marked with the warning
PROPER OPERATION REQUIRES BATTERY IN THIS LOCATION.
Low Battery Safeguards
The HP-7 5 has two low-power safeguards to protect the contents of the electronic disc.
After the first indication of low power, either recharge or replace the battery packs as soon as convenient.
• When the battery voltage drops below a predetermined level, the
BATT
annunciator turns on,
signifying from 5 minutes to 2 hours more of operation, depending on the condition of the
batteries. This time is based on running a program. If the electronic disc is being accessed, the
modem is on, or the wand is being used, the time will be drastically shortened .
• If the voltage continues to drop after this grace period, the HP-75 aborts its normal operations,
including any currently executing program, electronic disc access, or modem operation, and turns
itself off. However, the battery packs continue to power the electronic disc circuits. If the
[ATTN]
key or a due appointment causes the HP-75 to turn back on, the HP-75 briefly displays the
following message:
WARNING: low batteries
Immediately afterwards, the HP-75 turns off again. At this point, to prevent a complete reset,
don't press the
[ATTN]
key before connecting the unit to an ac outlet or before replacing the
battery packs. In this nearly discharged condition, the HP 82 718A will preserve the information
on the electronic disc for a few days as long as no one attempts to turn the unit back on.
If
the battery pack nears total discharge, the HP-75 will reset itself and lose everything in memory.
Independently, the HP 82 718A will reset itself and lose everything on the electronic disc. Resets may also
occur if an attempt is made to turn the unit on (by pressing
[ATTN])
or to acknowledge an alarm on low
batteries.
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