32 Controlling the Display
To
key
in
negative
expone
nts
of
10
, key
in
the
number
, press
a ,
pressEml
to make the
exponent
negative, then key
in
the
power
of
10.
For
example
, key
in
Pl
anck's
constant
(h)-
roughly, 6.625 x
10
-
27
erg sec.
-and
multiply
it
by
50
.
Press
Display
B3
1
0.000000
00
1
~
2
10.00
I
6.625a
16.625
001
lmJ 1
6
.
625
- 00 1
27
1
6
.
625
-
27
1
Imim
16.6250000
-27
1
500
1
3.3125000
- 251
Er
g sec.
Using
thea
key, you can key
in
numbers made up
of
10-digit
mantissas and two-digit
expo
n
ents
of
10.
However,
when
you
use the a key, the
H P
-2
5
di
splays each
number
as an eight-
digit mantissa and a two-digit
exponent
of
10
. I n a few
ca
s
es
, a
number
may have to be altered s
li
ghtly
in
form before you can
key
it
in
using
thea
key:
• If you key
in
a
number
whose mantis
sa
con
ta
in
s more than
eight digits to the left
of
the decimal point, theD key
is
overridd
en
and
does not operate. Begin aga
in
and key
in
the
number
in
a form that displays the mantissa with eight
digits
or
less to the left
of
the decimal point
bef
ore
pr
es
sing
theDkey
.
(Thus
, 123456789.1 x
10
23
could be keyed
in
as 12345678.91 x
10
24
. )
• If you key
in
a
number
whose
first significant digit
occurs
afte
r the first eight digits
of
the
di
spl
ay
,
theD
key
does
not
oper
ate upon
that
number.
To
key
in
the
number
cor-
rectly, begin again
and
place the
number
in a form such
that
it
s first sign
ifi
cant
digit
is
one
of
the first eight digits
of
the
display, then proceed using
thee
key. (Thus, 0000.000025
x
10
55
cannot be keyed
in
in
that
form.
It
could be keyed in
as 0000.00025 x
10
5
4,
or
as 0.000025 x
10
5
5,
for
example
.)
-,r:l.11
n~lIcn
IVlnt-t-l
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