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2
H o w to O pe r a te
2nd function key
Pressing this key will enable the functions
written in orange above the calculator
buttons.
ON/C, OFF key
D irect function
Mode key
This calculator can operate in three different
modes as follows.
<Example>
W ritten in orange above
the O N /C key
<Power on>
<Power off>
1 . K E Y L A Y O U T
If the calculator fails to operate normally,
press the reset switch on the back to
reinitialise the unit. T he display format
and calculation mode will return to their
initial settings.
RESET
2 . R E S E T S W I T C H
Reset switch
RESET
2nd function
N O T E :
Pressing the reset switch
will erase any data stored
in memory.
≈Read B efor e Using≈
This operation guide has been written based on the EL-531W , EL-509W , and EL-531W H
models. Some functions described here are not featured on other models. In addition,
key operations and symbols on the display may differ according to the model.
•Mode = 0; normal mode for
performing normal arithmetic
and function calculations.
[Normal mode]
•Mode = 1; STAT- 0 mode for
performing 1-variable statisti-
cal calculations.
[STAT-0 mode]
•Mode = 1; STAT -1–6 mode
for performing 2-variable
statistical calculations.
[STAT-1–6 mode]
W hen changing to the statistical sub-mode,
press the corresponding number key after
performing the operation to select the statistics
mode (press ).
(LIN E): Linear regression calculation
(Q UAD): Q uadratic regression calculation
(EX P): Exponential regression calculation
(LO G): Logarithmic regression calculation
(PW R): Power regression calculation
(IN V): Inverse regression calculation