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Appendix D: Operating Characteristics
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Logical Errors
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If you attempt a calculation containing a logical error—say division by
zero—an error signal is triggered and a blinking display appears. To
reset, press  CLx . The following are examples of logical errors:
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Division by zero
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yx where y ≤ 0
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Date/day calculations where (a) the range is exceeded, (b) a date entered doesn’t exist, (c) date entry conventions are not followed
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Scientific Notation
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Answers greater than 1010 (9,999,999,999 + 1)
are displayed in scientific notation-an abbreviated form of the number
showing an exponent of 10 in the last two character positions.
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If a number is displayed in scientific notation and has a negative exponent, pressing CHS
will, in addition to changing the sign of the number, alter the display
of the exponent. Although the exponent is not displayed properly, it is
correct internally and the number in the display may be used in a
normal manner for further calculations. However, if you wish, you can
produce the correct display before proceeding by pressing x y x y
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Environmental Considerations
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| Mode |
Temperature °C |
Temperature °F |
Operating
Charging
Storage |
0°C to + 50°C
+10°C to +40°C
–40°C to +55°C |
32°F to 122°F
50°F to 104°F
–40°F to 131°F |
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Battery Operation
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Use only the HP Rechargeable Battery Pack, Model 8200 I A, which has
been tested and is warranted for one year. The battery provides three to
five hours of continuous operation. By turning off the power when the
calculator is not in use, the HP-80 battery power will last easily
throughout a normal working day. Note that it is normal for the battery
charger to be warm to the touch when in use.
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All
decimal points light in the display when 2 to 5 minutes of operation
time remain in the battery pack. Even when all decimal points are turned
on, the true decimal position is known because an entire digit position
is allocated to it.
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