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Sonin dt110 Reference Guide

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- 6 -
KEY PAD INFORMATION
1
2
3
4
Performs arithmetic operation – the 
display "blinks" to confirm the key 
press.
5
Completes all previously entered 
arithmetic operations and displays 
the result. See page 21 for the use 
of this key with constants.
·
Enters a decimal point when in the 
df, m or number mode.
2nd
FN
Activates the "2nd function" of 
designated keys. Display blinks after
press until a "2nd function" key is 
pressed. Press again to stop blinking.
5
X
2
2nd
FN
Calculates the square of the value 
displayed. A fif or if display will 
automatically change to df when 
squared.
2nd
FN
C
X
%&
Calculates the square root of the value
displayed. A fif or if display will 
automatically change to df when the
square root is taken.
- 7 -
KEY PAD INFORMATION
DIMENSION KEYS
fif•df•m
modes
Converts between Foot-Inch-
Fraction (fif), Decimal Feet (df) and
Meters (m). The small labels at the 
top of the display indicate which mode
you're in. Switching modes works in
both directions.
ENTER
When in fif mode, this key ends a 
FEET or INCH entry and advances 
to the next input position.
/ 2
/ 4
/ 8 / 16
When in fif mode, these denominator
keys will complete your FRACTION
entries.
2nd
FN
A
fif • if
Changes display format between 
Foot-Inch-Fraction (fif) and Inch-
Fraction (if). Functional only when 
starting in the fif or if modes.
Puts calculator into the number 
modes where it works as a normal 
calculator (no dimensions) Return to
the fif mode anytime by pressing  
fif•df•m
modes
  again.
2nd
FN
fif•df•m
modes
number mode
- 8 -
KEY PAD INFORMATION
TRIANGLE KEYS
Enter any 2: A, B, C, or S and automatically solve
for the other 2.
C
diagonal
run
A
rise B
    12"
S
S = slope in inches
If any 2 of the above values are entered pressing
A, B, C, or S will display the calculated or stored
value of the key.
The triangle key values are retained in memory
even after INCHMATE+ is turned off.
A
"run" – Press keys after an entry or
a calculated result is displayed to 
enter that value into "run" memory 
or to recall.
B
"rise" – Press keys after an entry or
a calculated result is displayed to 
enter that value into "rise" memory
or to recall.