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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 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
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USING THE +/– KEY
+/–
Press
to change the displayed value
from positive to negative or from negative
to positive.
MINUS - appears for a negative
Note:
value.
CALCULATION EXAMPLES
Basic
You Press You See
10
256 + 378 =
471 – 223 =
15.5 × 2.3 =
17.2 ÷ 2.5 =
24 +
634.
248.
35.65
6.88
24.
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You Press You See
36 –
75
8
9 =
×
÷
60.
MINUS
MINUS – 120.
–
MINUS
13.333333
–
15.
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 =
9 =
10 =
100 ÷ 5 =
35.
45.
50.
20.
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You Press You See
200 =
300 =
40.
60.
Percentage
Example: 20% of 720 is 144.
You Press You See
720 × 20 %
144
Add-On
Example: 30% added to 540 is 702.
You Press You See
540 + 30 %
12
702.
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Discount
Example: 800 discounted by 20% is 640.
You Press You See
800 – 20 %
640.
Reciprocal
Example: 1/8 = 0.125
You Press You See
8 ÷ =
0.125
Exponent
Example: 76 = 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
ON/C
the memory, then press
calculations.
To add a value to memory, enter the number or calculation you want to add, then
M+
press
. The calcu lator tot als the cur rent
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.
to clear all
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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
786 M+
432 M–
2392 +
÷
576
MRC
–
0.
MEMORY 786.
MEMORY 432.
MEMORY 2392.
MEMORY 2968.
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
inches into centimeters, press
12 inches = 30.48 centimeters. To convert
centimeters into inches, use .
16
is printed above 7. To convert 12
12
7.
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Length
Example: 5.5 cm = ? in
You Press You See
5.5 in cm (7)
5
Example: 7
÷
5
/8 in = ? cm
You Pr ess You Se e
8 + 7 = in cm (7)
Example: 12.8 m = ? ft
You Press You See
12.8 ft m (8)
2.1653543
19.3675
41.99475
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Example: 54 yd = ? m
You Press You See
54 yard m (M+)
Weight
Example: 630 lb = ? kg
You Press You See
630 lb kg (.)
Example: 1 lb = ? kg
You Press You See
1 lb kg (.)
18
49.3776
285.768
0.4536
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Volume
m3(2)
ml (–)
3
11.015313
3.3813484
Example: 389 ft3 = ? m
You Pr ess You Se e
389 ft
3
Example: 100 ml = ? (US) fl. oz
You Press You See
fl.
100
oz
Example: 245 (US) gal = ? l
You Pr ess You See
245 gal l (3)
927.423
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Temperature
Example: 125°F = ? °C
You Pre ss You See
)
125 °F °C (+/–
51.666666
Example: –35°C = ? °F
You Pre ss You See
)
35 +/- °F °C(+/–
MINUS - 31.
Area
Example: 245 ft2 = ? m
You Press You See
2
245 ft
2
2
(5)
m
22.7605
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Example: 1540 cm2 = ? ft
You Press You See
1540 in
2
cm
2
(4)
2
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 cau se a mal function an d invalid ate its warr anty. If yo ur
calculator is not performing as it should,
take it to your local RadioShack store for
assistance.
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REPLACING THE BATTERY
Although yo ur calculator uses solar power
most of the time, the backup battery will
eventually become weak an d need replac ing. 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.
Warning: Keep the battery out of
reach of children. Swallowing a button-cell battery can be fatal.
Cautions:
• Always remove an old or weak bat-
tery. 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
Weight (Including Battery) ................. 2 oz
Specifications are typical; individual units
might vary. Specifications are subject to
change and improvement without notice.
3
/16 ×××× 3 ×××× 9/32 in
(13.2 ×××× 7.6 ×××× 0.7 cm)
(56.7 g)
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Limited One-Year Warranty
This product is warranted by RadioShack against manufacturing defects in material and w orkmanship under normal use for one (1) year from the date of purchase from
RadioShack com pany-owned s tores and authorized R adioShack 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
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 damag es, so the above limitations or exclusions may not apply to you.
In the event of a product defect during the warranty period, take the prod uct and the Radi oShack sales rec eipt
as proof of purchase date to any RadioS hack store. R adioShack 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 o r similar desi gn; or (c) r efund the pur chase price. All replaced parts and products, and products on which a refund is made,
(
Continued
27
)
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(
Continued
reconditioned parts and products may be used in the performance of warr ant y s ervice. Re pa ired or replac ed pa rts
and products are warranted for the remainder of the original warranty peri od. You will be charged for r epair 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 attributab le to acts of God , abus e, acci dent ,
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 F acility; (c) consum ables
such as fuses or batteries; (d) cosmetic damage; (e)
transportation, shi ppi ng or in sura nce c osts; or (f) cost s of
product removal, installation, set-up service adjustment or
reinstallation.
This warranty gives you specific legal rights, and you may
also have other righ ts which vary from state to state.
RadioShack Cus to m er R elations, 200 Taylor Street, 6th
become the property of RadioShack. New or
)
Floor, Fort Worth, TX 76102
We Service What We Sell
4/99
RadioShack
A Division of Ta ndy Corporation
Fort Worth, Texas 76102
07A99 Printed in China
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