GB
Copyright L
EXIBOOK
2002
- 15 -
●
Operation modes
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
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 (
n
), number of significant digits (
n
),
and angle unit (Deg, Rad, Gra) will retained in memory.
*** To return to standard operation (initialized state) press
(COMP mode) –
(RUN mode) –
(Norm 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
5
÷
7 =
3
5
7
3
5
7
42857
*** Calculation results greater than 10
10
(10 billion) or less than 10
-2
(0.01) are automatically displayed
in exponential form.
Example: 123456789 x 9638
123456789
9638
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.
Example: 3 x 10
5
÷
7 =
3
5
7
42857
*** 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
99
.
2) An attempt is made to perform functional calculations that exceed the input range.
3) Improper operation during statistical calculations.
(Ex. Attempting to obtain x
σ
or x
σ
n without
data input)
4) The capacity of the numeric value stack or the command stack is exceeded.
(Ex. Entering 23 successive ’s followed by
)
MODE
7
MODE
+
MODE
1
MODE
8
MODE
9
EXP
EXE
÷
EXP
EXE
÷
EXP
-
EXE
-
EXE
(
2
+
3
x
4
EXE
÷
x
EXE
42857.14286
0.1428571
12
1.189876532
42857.14286
.14286
