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Cat. No. 65-538
OWNER’S MANUAL
EC-252
Metric Conversion Calculator
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INTRODUCTION
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
used by Tandy Corporation.
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KEYS AND FUNCTIONS
— Converts standard to metric measurements.
— Converts metric to standard measurements.
+/– (°F
°C) — Changes a displayed
number from positive to negative and vice
versa. Also converts Fahrenheit to Celsius
and vice versa.
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2
÷ (acre
m ) — 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.
m) — Enters 8. Also converts feet
to meters and vice versa.
8 (ft
9 (mile
km) — Enters 9. Also converts
miles to kilometers and vice versa.
hectare) — Performs the multi× (acre
plication 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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2
2
4 (in
cm ) — Enters
4. Also converts
square inches to square centimeters and
vice versa.
2
2
5 (ft
m ) — Enters
5. Also converts
square feet to square meters and vice versa.
2
6 (mile
2
km ) — Enters
6. Also converts
square miles to square kilometers and vice
versa.
– (fl.oz
ml) — 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.
3
1 (in
3
1. Also converts
cubic inches to cubic centimeters and vice
versa.
3
2 (ft
cm ) — Enters
3
m) — Enters
2. Also converts cubic 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
calculation. Also converts Imperial gallons
to liters and vice versa.
+ (Imp.fl.oz
ml) — 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
Press ON/C to turn on the calculator.
Notes:
• The calculator turns off automatically if
you do not press any key within about
11 minutes.
• When you turn the calculator off, previous entries are cleared.
CORRECTING ENTRY
ERRORS
If you enter an incorrect value, press ON/C
once. Then enter the correct value and
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To clear the display for a new calculation,
press ON/C twice. 0. appears, then begin
the new calculation.
If you press an incorrect operator key (+, –,
×, ÷), simply press the correct key and continue your calculation.
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 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 decimal point.
For example, the displayed value ERROR
is estimated to equal
101,420,640.
1.0142064
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USING THE +/– KEY
Press +/– to change the displayed value
from positive to negative or from negative
to positive.
Note: MINUS - appears for a negative
value.
CALCULATION EXAMPLES
Basic
10
You Press
You See
256 + 378 =
634.
471 – 223 =
248.
15.5 × 2.3 =
35.65
17.2 ÷ 2.5 =
6.88
24 +
24.
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You Press
You See
36 –
60.
75 ×
MINUS – 15.
8÷
MINUS – 120.
9=
MINUS – 13.333333
Constants
For multiplication, the first value you enter is
the constant. For addition, subtraction, and
division, the second value you enter is the
constant.
You Press
You See
5×7=
35.
9=
45.
10 =
50.
100 ÷ 5 =
20.
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You Press
You See
200 =
40.
300 =
60.
Percentage
Example: 20% of 720 is 144.
You Press
You See
720 × 20 %
144
Example: 30% added to 540 is 702.
12
You Press
You See
540 + 30 %
702.
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Discount
Example: 800 discounted by 20% is 640.
You Press
You See
800 – 20 %
640.
Reciprocal
1
Example: /8 = 0.125
You Press
You See
8÷=
0.125
Exponent
6
Example: 7 = 117649
You Press
You See
7×= = = = =
117649
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MEMORY CALCULATIONS
To store a value in memory, first press
MRC (memory recall/clear) twice to clear
the memory, then press ON/C to clear all
calculations.
To add a value to memory, enter the number or calculation you want to add, then
press M+. The calculator totals the current
calculation (if one is pending) and adds
that value to memory.
Note: MEMORY appears in the upper right
to show that a value is stored in memory.
To subtract a value from memory, enter
the number or calculation you want to subtract, then press M–. The calculator totals
the current calculation (if one is pending)
and subtracts that value from memory.
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To recall the value from memory, press
MRC once. The memory value appears.
To clear the contents in memory, press
MRC twice so MEMORY disappears.
Example:
2392 + 576
————— – 73 = –64.61582
786 – 432
You Press
You See
MRC MRC ON/C
0.
786 M+
MEMORY 786.
432 M–
MEMORY 432.
2392 +
MEMORY 2392.
576 ÷
MEMORY 2968.
MRC
MEMORY 354.
–
MEMORY
8.3841807
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You Press
You See
73 =
MINUS – MEMORY
64.61582
CONVERSION
and
let you select the conversion direction — to metric or from metric. The
symbols above each key show you which
conversion each key makes. For example,
in
cm is printed above 7. To convert 12
7.
inches into centimeters, press 12
12 inches = 30.48 centimeters. To convert
centimeters into inches, use
.
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Length
Example: 5.5 cm = ? in
You Press
5.5
in
You See
cm (7)
2.1653543
5
Example: 7 /8 in = ? cm
You Press
5÷8+7=
in
You See
cm (7)
19.3675
Example: 12.8 m = ? ft
You Press
12.8
ft
You See
m (8)
41.99475
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Example: 54 yd = ? m
You Press
54
You See
m (M+)
yard
49.3776
Weight
Example: 630 lb = ? kg
You Press
630
lb
You See
kg (.)
285.768
Example: 1 lb = ? kg
You Press
1
18
lb
kg (.)
You See
0.4536
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Volume
3
3
Example: 389 ft = ? m
You Press
389
3
ft
You See
3
m (2)
11.015313
Example: 100 ml = ? (US) fl. oz
You Press
100
fl.oz
You See
ml (–)
3.3813484
Example: 245 (US) gal = ? l
You Press
245
gal
You See
l (3)
927.423
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Temperature
Example: 125°F = ? °C
You Press
125
You See
°C (+/–)
°F
51.666666
Example: –35°C = ? °F
You Press
35 +/-
°F
You See
°C(+/–)
MINUS - 31.
Area
2
Example: 245 ft = ? m
You Press
2
245
20
ft
2
You See
2
m (5)
22.7605
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2
2
Example: 1540 cm = ? ft
You Press
2
1540
in
You See
2
cm (4)
238.70047
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CARE
To enjoy your EC-252 Metric Conversion
Calculator for a long time:
• Keep the calculator dry. If it gets wet,
wipe it dry immediately.
• Use and store the calculator only in
normal temperature environments.
• Handle the calculator gently and carefully. Don’t drop it.
• Keep the calculator away from dust
and dirt.
• Wipe the calculator with a damp cloth
occasionally to keep it looking new.
Modifying or tampering with the calculator’s internal components can cause a malfunction and invalidate its warranty. If your
calculator is not performing as it should,
assistance.
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REPLACING THE BATTERY
Although your calculator uses solar power
most of the time, the backup battery will
eventually become weak and need replacing. If the display speed slows down in a
dimly-lit room, replace the battery with a
Cat. No. 23-117).
Caution: Use only a fresh battery of the required size and type.
Follow these steps to replace the battery.
1. Use a small Phillips screwdriver and
remove the two screws from the lower
case.
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2. Carefully insert a small, flat-blade
screwdriver between the lower case
halves, then slightly twist the screwdriver to separate the lower front and
back case halves.
3. Use a screwdriver to gently pry out the
old battery.
Warning: Keep the battery out of
reach of children. Swallowing a button-cell battery can be fatal.
Cautions:
• Always remove an old or weak battery. Batteries can leak chemicals
that can destroy electronic parts.
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• Dispose of the old battery promptly
and properly. Do not burn or bury it.
4. Position the new battery so the positive (+) side is up, then insert it into the
battery compartment.
5. Snap the front and back case halves
back together, then replace the
screws.
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SPECIFICATIONS
Display ................................... 8-Digit LCD
Solar Cell
Minimum Illumination .................. 150 LUX
Battery ................... One 389A Button-Cell
(Cat. No. 23-117)
Battery Life .......................... About 1 Year
Operation Temperature ........... 32°–104°F
(0°C–40°C)
3
9
Dimensions .................. 5 /16 × 3 × /32 in
(13.2 × 7.6 × 0.7 cm)
Weight (Including Battery) ................. 2 oz
(56.7 g)
Specifications are typical; individual units
might vary. Specifications are subject to
change and improvement without notice.
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Limited One-Year Warranty
This product is warranted by RadioShack against manufacturing defects in material and workmanship under normal use for one (1) year from the date of purchase from
RadioShack company-owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS
WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED
IN DURATION TO THE DURATION OF THE WRITTEN
LIMITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL
HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH
RESPECT TO ANY LIABILITY, LOSS OR DAMAGE
CAUSED DIRECTLY OR INDIRECTLY BY USE OR
PERFORMANCE OF THE PRODUCT OR ARISING
OUT OF ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF TIME, DATA,
PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an
implied warranty lasts or the exclusion of incidental or
consequential damages, so the above limitations or exclusions may not apply to you.
In the event of a product defect during the warranty period, take the product and the RadioShack sales receipt
as proof of purchase date to any RadioShack store. RadioShack will, at its option, unless otherwise provided by
law: (a) correct the defect by product repair without
charge for parts and labor; (b) replace the product with
one of the same or similar design; or (c) refund the purchase price. All replaced parts and products, and products on which a refund is made,
(Continued)
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(Continued) become the property of RadioShack. New or
reconditioned parts and products may be used in the performance of warranty service. Repaired or replaced parts
and products are warranted for the remainder of the original warranty period. You will be charged for repair or replacement of the product made after the expiration of the
warranty period.
This warranty does not cover: (a) damage or failure
caused by or attributable to acts of God, abuse, accident,
misuse, improper or abnormal usage, failure to follow instructions, improper installation or maintenance, alteration, lightning or other incidence of excess voltage or
current; (b) any repairs other than those provided by a
RadioShack Authorized Service Facility; (c) consumables
such as fuses or batteries; (d) cosmetic damage; (e)
transportation, shipping or insurance costs; or (f) costs of
product removal, installation, set-up service adjustment or
reinstallation.
This warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
RadioShack Customer Relations, 200 Taylor Street, 6th
Floor, Fort Worth, TX 76102
We Service What We Sell
4/99
A Division of Tandy Corporation
Fort Worth, Texas 76102
07A99
Printed in China
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