Sonin DT220, Reference Manual

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REFERENCE
Chaining
Your calculator utilizes chaining logic allowing you to carry
out successive intermediate operations using the [ =] key to
finalize operations. Since the chaining logic works from left
to right, you must use care when combining operation such
as addition and multiplication by first addressing operations
within brackets.
Example: 1 + 2 x 3 + 4 = 13 Enter the values and operators
as they are written and press [=] to get the answer.
Example: (1 + 2) x (3 + 4) = 21
Enter 1 [+] 2 [=] [M+]
Then enter 3 [+] 4 [x] [RCL] [M+] [=]
NOTE:
To recall and remove from memory press [RCL] [RCL] .
To recall & keep in memory storage press [RCL] [M+] .
Error/Overflow
An error/overflow condition occurs when the result of a
calculation has more than 7 digits to the left of the decimal
point, or when you attempt to divide a value by zero or
calculate mixed units that are not alike. An Error condition
is indicated by the " Error" displayed. You must clear the
calculator display by pressing [CE/CLR] before continuing
operations. Clearing an Error condition will not clear
values stored in the memory registers.
Auto-Range
If the input or calculation result with small units is out of the
7 digit range of the display, the answer will be expressed in
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REFERENCE
the next larger units instead of showing " Error "
Care
Don’t leave calculator in direct sunlight for long periods, or
store it where excessive temperatures are possible. Don’t
leave the calculator on when not in use (NOTE- To save the
battery, calculator will turn off automatically after 10-12
minutes of inactivity, at which time the displayed value and
memory contents will be cleared.
Battery
This unit requires one 3V lithium battery (CR2032 or
equivalent). The average battery operating life is 2000 hours.
When the display slows down and/or becomes dim, it is time
for a new battery.
To change the battery
1.) Turn power off.
2.) Remove screw from battery lid & slide cover off.
3.) Before removing the battery, be sure to touch a metal
object. This is to avoid any accidental discharge of
static electricity, which may harm the circuit board.
4.) Install new battery with the (+) side up.
Resetting Your Calculator
To reset your calculator, turn unit over and see “RESET”.
Press with point of ball point pen. You calculator is now reset.
NOTE: RESETTING YOUR CALCULATOR WILL ERASE
ANYTHING IN MEMORY OR PAPERLESS TAPE.
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APPENDIX
Conversion Tables
1 square inch = 6.4515 sq centimeters
1 square foot = 144 square inches
1 square foot = 0.92903 sq meters
1 square yard = 9 square feet
1 square yard = 0.836127 sq meters
1 cubic inch = 16.3871 cu centimeters
1 cubic foot = 1728 cubic inches
1 cubic foot = 0.02831 cu meters
1 cubic yard = 27 cubic feet
1 cubic yard = 0.76455 cu meters
1 mile = 5,280 feet
1 mile = 1.609344 kilometers
1 acre = 43,560 square feet
1 ounce = 28.349532 grams
1 pound = 0.4535924 kilograms
1 (U.S.) gallon = 3.7854118 liters
1 (U.K.) gallon = 4.546090 liters
1 fluid ounce
= 29.574 milliliters
Fahrenheit = 9/5 (C) + 32
Centigrade = 5/9 (F - 32)
pi ( p ) = 3.141593