Radio Shack EC-252 Owner's Manual

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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 trademark 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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÷ ( 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 ( in

2 cm

2

) — Enters 4 . Also converts square inches to square centimeters and vice versa.

5 ( ft

2 m

2

) — Enters 5 . Also converts square feet to square meters and vice versa.

6 ( mile

2 km

2

) — 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.

1 ( in

3 cm

3

) — Enters 1 . Also converts cubic inches to cubic centimeters and vice versa.

2 ( ft

3 m )

3

— 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 continue your calculation.

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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

1.0142064

is estimated to equal

101,420,640.

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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

You Press

256 + 378 =

471 – 223 =

15.5

×

2.3 =

17.2 ÷ 2.5 =

24 +

You See

634.

248.

35.65

6.88

24.

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You Press

36 –

75

×

8 ÷

9 =

You See

60.

MINUS – 15.

MINUS – 120.

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

5

××××

7 =

9 =

10 =

100 ÷ 5 =

You See

35.

45.

50.

20.

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You Press

200 =

300 =

Percentage

Example: 20% of 720 is 144.

You See

40.

60.

You Press

720

×

20 %

You See

144

Add-On

Example: 30% added to 540 is 702.

You Press

540 + 30 %

You See

702.

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Discount

Example: 800 discounted by 20% is 640.

You Press

800 – 20 %

You See

640.

Reciprocal

Example:

1

/ 8 = 0.125

You Press

8 ÷ =

You See

0.125

Exponent

Example: 7

6

= 117649

You Press

7

×

= = = = =

You See

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

MRC MRC ON/C

786 M+

432 M–

2392 +

576 ÷

MRC

–

You See

0.

MEMORY 786.

MEMORY 432.

MEMORY 2392.

MEMORY 2968.

MEMORY 354.

MEMORY

8.3841807

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You Press

73 =

You See

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,

is printed above 7 . To convert 12 inches into centimeters, press 12 7 .

12 inches = 30.48 centimeters. To convert centimeters into inches, use .

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Length

Example: 5.5 cm = ? in

You Press You See

2.1653543

Example: 7

5

/ 8 in = ? cm

5 ÷ 8 + 7 =

You Press

in cm (7)

Example: 12.8 m = ? ft

You See

19.3675

12.8

You Press

ft m (8)

You See

41.99475

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Example: 54 yd = ? m

54

You Press

yard m (M+)

Weight

Example: 630 lb = ? kg

You See

49.3776

630

You Press

lb kg (.)

Example: 1 lb = ? kg

1

You Press

lb kg (.)

You See

285.768

You See

0.4536

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Volume

Example: 389 ft

3

= ? m

3

389

You Press ft

3 m

3

(2)

You See

11.015313

Example: 100 ml = ? (US) fl. oz

100

You Press fl.

oz ml (–)

You See

3.3813484

Example: 245 (US) gal = ? l

245

You Press gal l (3)

You See

927.423

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Temperature

Example: 125°F = ? °C

You Press You See

51.666666

Example: –35°C = ? °F

35 +/-

You Press

°F °C(+/–)

Area

Example: 245 ft

2

= ? m

2

You See

MINUS - 31.

You Press

245 ft

2 m

2

(5)

You See

22.7605

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Example: 1540 cm

2

= ? ft

2

1540

You Press

in

2 cm

2

(4)

You See

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, take it to your local RadioShack store for 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

389A-type button-cell battery (RadioShack

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.

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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)

Dimensions .................. 5

3

/ 16

××××

3

××××

9

/ 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 PRO-

VIDED HEREIN, RadioShack MAKES NO EXPRESS

WARRANTIES AND ANY IMPLIED WARRANTIES, IN-

CLUDING THOSE OF MERCHANTABILITY AND FIT-

NESS FOR A PARTICULAR PURPOSE, ARE LIMITED

IN DURATION TO THE DURATION OF THE WRITTEN

LIMITED WARRANTIES CONTAINED HEREIN. EX-

CEPT AS PROVIDED HEREIN, RadioShack SHALL

HAVE NO LIABILITY OR RESPONSIBILITY TO CUS-

TOMER 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, INCLUD-

ING, BUT NOT LIMITED TO, ANY DAMAGES RESULT-

ING FROM INCONVENIENCE, LOSS OF TIME, DATA,

PROPERTY, REVENUE, OR PROFIT OR ANY INDI-

RECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED

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

07A99

RadioShack

A Division of Tandy Corporation

Fort Worth, Texas 76102

Printed in China