HP 25 - Page 33

Controlling the Display 29
Engineering notation is selected by pressing a ~ followed by
a number key . In engineering notation , the first three digits are
always present , and the number key specifies the number of
additional digits displayed after the first three . For example:
Press Display
0.0000123451 0.000012345
a ~ O 112.3 -06
I Engineering notation display.
a ~ 2
First three digits visible and
power of lOis the proper mUltiple
of three .
1 12.345 -06 IThe number key specifies the .
rei 1 :-; 2 ;-; .3 ;;-; 4 ~ 50 -;:-: 0 =-- - - -:::- 06"' 1
number of digits displayed be-
yond the first three.
Notice that because the first three digits are always present, the
greatest number of additional digits that can be specified in engi-
neering notation is five.
Press Display
I 12.345000 -06 1 Maximum number of digits
displayed.
'I -:- 12 =- . -=- 34 7. 5 ::-: 0 :-= 0 -=- 0- - -=- 06 -:-1 1 No change in display.
1 12.345000 -06 1No change in display .
Rounding of displayed numbers in ENG 5 and ENG 6 is similar
to the rounding of numbers in SCI7 and SCI8, discussed earlier.
As with all display formats, engineering notation display does
not affect the actual number as it is held internally by the calcu-
lator , but only alters the manner in which the number is displayed.
When engineering notation has been selected, the decimal point
shifts to show the mantissa as units , tens , or hundreds in order
to ma intain the exponent of 10 as a mUltiple of three . For ex-
ample , mUltiplying the number now in the calculator by 10
causes the decimal point to shift to the right without altering the
exponent of 10:
Press
a ~ o
100
Display
I 12.3 -06 I
LI.:.c 12 :::.c 3 ::.: . ____ -0 ~ 6 ~ 1 Decimal point shifts. Powerof 10
remains at 10 -
6
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