Radio Shack EC-252 User Manual
65-538.fm Page 1 Monday, December 13, 1999 9:15 AM
Cat. No. 65-538
OWNER’S MANUAL
Please read before using this equipment.
EC-252
Metric Conversion Calculator
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INTRODUCTION
Your EC-252 Metric Conversion Calculator
conveniently combines an internal battery
and a solar panel, so you can use the calculator anywhere. It also has a three-key
memory system so you can add, subtract,
and recall a calculated figure. In addition to
performing standard calculations, your calculator has dual-function keys to perform
20 built-in metric conversion calculations.
CONTENTS
Keys and Functions ............................ 3
Operation .............................................. 7
Turning on the EC-252 ................... 7
Correcting Entry Errors ................... 7
Calculation Errors ........................... 8
Using the +/– Key ......................... 10
Calculation Examples ................... 10
Memory Calculations .................... 14
Conversion ................................... 16
Care ..................................................... 22
Replacing the Battery ................... 23
Specifications .................................... 26
©1999 Tandy Corporation.
All Rights Reserved.
RadioShack is a registered trademar k
2
used by Tandy Corporation.
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KEYS AND FUNCTIONS
— Converts standard to metric mea-
surements.
— Converts metric to standard mea-
surements.
+/– (°F °C
number from positive to negative and vice
versa. Also converts Fahrenheit to Celsius
and vice versa.
) — Changes a displayed
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÷ (acre m
2
) — Performs the division
function. Also converts acres to square
meters and vice versa.
ON/C
— Turns on power. Also clears the
last entry when pressed once and clears
the whole calculation when pressed twice.
7 (in cm
) — Enters 7. Also converts
inches to centimeters and vice versa.
8 (ft m
) — Enters 8. Also converts feet
to meters and vice versa.
9 (mile km
) — Enters 9. Also converts
miles to kilometers and vice versa.
×
× ((((acre
× ×
hectare)
— Performs the multiplication function. Also converts acres to
hectares and vice versa.
MRC
— (Memory Recall/Clear) Recalls an
answer from memory when you press it
once. Clears the memory when you press
it twice.
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4 (in2cm
2
) — Enters 4. Also converts
square inches to square centimeters and
vice versa.
5 (ft2m
2
) — Enters 5. Also converts
square feet to square meters and vice versa.
6 (mile2km
2
) — Enters 6. Also converts
square miles to squ are kilo meters and vice
versa.
– (fl. ml
oz
) — Performs the subtraction
function. Also converts fluid ounces to milliliters and vice versa.
M– (Imp.ton kg
) — Subtracts from and
keeps the answer in memory. Also converts imperial tons to kilograms and vice
versa.
1 (in3cm
3
) — Enters 1. Also converts
cubic inches to cubic centimeters and vice
versa.
3
2 (ft
m
)3 — Enters 2. Also converts cu-
bic feet to cubic meters and vice versa.
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3 (gal l
) — Enters 3. Also converts US
gallons to liters and vice versa.
M+ (yard m
) — Adds and stores a calculation answer in memory. Also converts
yards to meters and vice versa.
0 (oz g
) — Enters 0. Also converts
ounces to grams and vice versa.
. (lb kg
) — Enters the decimal point.
Also converts pounds to kilograms and
vice versa.
= (Imp.gal l
) — Gives the answer to a
calculati on. Also conv erts Imperi al gallons
to liters and vice versa.
+ (Imp.fl. ml
oz
) — Performs the addition function. Also converts Imperial fluid
ounces to milliliters and vice versa.
% (KJ KC
) — Figures percentages.
Also converts kiloJoules to kilocalories and
vice versa.
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OPERATION
TURNING ON THE EC-252
ON/C
Press
Notes:
• The calculator turns off automatically if
• When you turn the calculator off, previ-
CORRECTING ENTRY
ERRORS
to turn on the calculator.
you do not press any key within about
11 minutes.
ous entries are cleared.
If you enter an incorrect value, press
once. Then enter the correct value and
continue your calculation.
ON/C
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To clear the display for a new calculation,
ON/C
press
the new calculation.
If you press an incorrect operator key (
××××, ÷), simply press the correct key and con-
tinue your calculation.
twice. 0. appears, then begin
+, –
CALCULATION ERRORS
ERROR appears in the upper left corner
when:
• A calculation result exceeds 8 digits to
the left of the decimal point. This is an
overflow error (see “Estimating Calculation Results”).
• A memory calculation result exceeds
8 digits to the left of the decimal point.
Memory contents remain unchanged.
• You try to divide by 0.
,
To clear an error, press
8
ON/C
.
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Estimating Calculation Results
If you perform a calculation that results in
an overflow error, you can estimate the correct result (to 8 significant digits) by following these steps.
1. Count the number of digits displayed
to the left of the decimal point.
2. Remove the decimal point.
3. Add as many zeros to the right of the
number as there were digits to the left
of the decim al point.
For example, the displayed value
1.0142064
101,420,640.
is estimated to equal
ERROR
9
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