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32
Controlling the Display
To key
in
negative
exponent
s 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
Planck's constant
(h)-
roughly
,
6.625
x
10-
27
erg sec .-and
multiply it
by 50
.
Press
Display
B3
10.000000
001
~
2
10.00
I
6.625a
16.625
00
1
lmJ
1
6 . 625
-
00
1
27
1
6 . 625
-
27
1
Imim
16.6250000
-27
1
500
13.3125000
-
25
1
Erg
sec.
Using
thea key
,
you can
key
in
num
bers
made up
of
10-digit
mantissas
and
two-digit
exponents
of
10.
However,
when you
use the a
key
,
the
H P-25 di splays each
number
as an
eight-
digit mantissa
and a two-digit exponent of
10.
I
n
a
few cases
,
a
number may have to
be altered slightly
in form
before you can
key it in using thea
key:
•
If
you key
in
a
number
who se mantissa con
tain
s
mo re
than
eight
digits
to the
left
of the
decimal
poin
t
, the
D
key is
overridden and does
not
o
perate
.
Begin
again
and
key
in
the number in
a form th at display
s
the
ma
ntiss
a
with
eight
digits
or less
to the left
of the decimal point before
pres
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
significa
nt
digit occurs
after
the first
e
ight
d igits of the di splay
,
theD key does
not
operate
upon
that
number.
To key in the
number
cor-
rectly, begin again and place the
number
in
a
form such that
its
first sign ificant digit
is
one of the first
eight
digits
of
the
display,
then proceed using
thee key. (Thu s, 0000.000025
x
10
55
ca
nnot
be
keyed in
in
that form.
It
could
be
ke
yed in
as 0000.00025
x
10
5
4,
or
as
0.000025
x
10
5
5,
fo
r example .)
-,r:l.11
n~lIcn
IVlnt-t-l
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