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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 yellow above the calculator but-
tons.
ON/C, OFF key
D irect function
Mode key
This calculator can operate in three different
modes as follows.
<Example>
W ritten in yellow above
the O N /C key
<Power on>
<Power off>
1 . K E Y L A Y O U T
•Mode = 0; normal mode for
performing normal arithmetic
and function calculations.
•Mode = 1; STAT- 1 mode for
performing 1-variable statisti-
cal calculations.
•Mode = 2; STAT-2 mode for
performing 2-variable statisti-
cal calculations.
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
[Normal mode]
[STAT-1 mode]
[STAT-2 mode]
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-531V, EL-509V, EL-531VH, and
EL-509VH 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.