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Logical Errors
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
:
•
Division by zero
•
y" whe re
y
s::
0
•
Date/day
calculations where (a)
the
range
is
exceeded, (b) a date
entered doesn't exist, (c) date entry
conventions
are not
followed
Scientific Notation
Answers greater than 10'" (9,999,999,999
+
I)
are displayed in
scien-
tific notation-an
abbreviated
form
of
the number
showing an
expo-
nent of 10 in the last two character positions.
If a
number
is displayed in
scientific
notation and has a negative
ex-
ponent,
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.
How-
ever, if you wish, you can produce
the
correct display before proceeding
Environmental Considerations
Mode
Temperature °C
Temperature of
Operating
O°C to + 50°C
(32°F to
122°
F)
Charging
+10°C to
+40°C
(50°F
to
104°F)
Storage
-40°C
to
+ 55°C
(-40°F
to
131°F)
Battery Operation
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.
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 turn
ed
on, the true decimal position is known
because
an
entire digit position is
allocated
to it.
68
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