2
H ow to O pe ra 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 AY O U T
If the calculator fails to operate normally,
press the reset switch on the back to
reinitialise the unit. The 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 OT E :
Pressing the reset switch
will erase any data stored
in memory.
≈
R ead B efore 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
