LEXIBOOK GC500i Instruction Manual page 15

Operation modes
G
There are a total of three operation modes.
1) RUN mode: Graph production as well as manual calculations and program executions.
2) WRT mode: Program storage and editing.
3) PCL mode: Deletion of stored programs.
Calculation modes
G
There are a total of four calculation modes which are employed according to the type of calculation.
1) COMP mode: General calculations, including functional calculations.
2) BASE-N mode: binary, octal, decimal, hexadecimal conversion and calculations, as well as logical
operations. Function calculations and graph drawing cannot be performed.
3) SD mode: Standard deviation calculation (single-variable statistics).
4) LR mode: Regression calculation (paired-variable statistics)
With so many modes available, calculations should always be performed after confirming which mode is
active.
*** When the power of the unit is switched off (including AUTO Power Off), the current system mode is
cancelled, and the unit will be set to the RUN mode when switched on again. However, the calculation
mode, number of decimal place setting (
and angle unit (Deg, Rad, Gra) will retained in memory.
*** To return to standard operation (initialized state) press
(RUN mode) –
MODE
1.4.4 Number of input / output digits and calculation digits
The allowable input / output range (number of digits) of this unit is 10 digits for a mantissa and 2 digits
for an exponent. Calculation, however, are internally performed with a range of 12 digits for mantissa and
2 digits for an exponent.
Example: 3 x 10 ÷ 7 =
5
÷
3 5 7
EXP EXE
÷
3 5 7
EXP -
*** Calculation results greater than 10
in exponential form.
Example: 123456789 x 9638
123456789 9638
x
Once a calculation is completed, the mantissa is rounded off to 10 digits and displayed. And the displayed
mantissa can be used for the next calculation.
÷ 7 =
Example: 3 x 10
5
÷
3 5 7
EXP EXE
42857
- EXE
*** Values are stored in memory with 12 digits for the mantissa and 2 digits for the exponent.
1.4.5 Overflow and errors
If the calculation range of the unit is exceeded, or incorrect inputs are made, an error message will appear
on the display window and subsequent operation will be impossible. This is the error check function.
The following operations will result in errors:
1) The answer, whether intermediate or final, or any value in memory exceeds the value of
+ 9.999999999 x 10
2) An attempt is made to perform functional calculations that exceed the input range.
3) Improper operation during statistical calculations. (Ex. Attempting to obtain xσ or xσn without
data input)
4) The capacity of the numeric value stack or the command stack is exceeded.
(Ex. Entering 23 successive
Copyright L 2002
EXIBOOK
n), number of significant digits (
MODE 7
MODE
(Norm mode).
9
42857
EXE
(10 billion) or less than 10
10
EXE
.
99
's followed by
( 2
MODE 8
(COMP mode) –
+
MODE
42857.14286
0.1428571
(0.01) are automatically displayed
-2
12
1.189876532
42857.14286
.14286
)
x
+
3 4 EXE
- 15 -
GB
n),
1