Radio Shack Calculator EC 252 User Guide

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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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KEYS AND FUNCTIONS  
— Converts standard to metric mea-  
surements.  
— Converts metric to standard mea-  
surements.  
+/– (°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 ) — 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 multi-  
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 ver-  
sa.  
2
2
6 (mile  
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 milli-  
liters and vice versa.  
M– (Imp.ton  
kg) — Subtracts from and  
keeps the answer in memory. Also con-  
verts imperial tons to kilograms and vice  
versa.  
3
3
1 (in  
cm ) — 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 cal-  
culation 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 addi-  
tion 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, previ-  
ous 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 con-  
tinue 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 Calcu-  
lation 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 cor-  
rect result (to 8 significant digits) by follow-  
ing 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  
You See  
256 + 378 =  
471 – 223 =  
634.  
248.  
35.65  
6.88  
24.  
×
15.5 2.3 =  
÷
17.2 2.5 =  
24 +  
10  
 
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You Press  
36 –  
You See  
60.  
×
MINUS 15.  
75  
8
÷
MINUS 120.  
MINUS13.333333  
9 =  
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  
×
35.  
45.  
50.  
20.  
5
7 =  
9 =  
10 =  
÷
100 5 =  
11  
 
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You Press  
You See  
200 =  
300 =  
40.  
60.  
Percentage  
Example: 20% of 720 is 144.  
You Press  
You See  
×
144  
720 20 %  
Add-On  
Example: 30% added to 540 is 702.  
You Press  
540 + 30 %  
You See  
702.  
12  
 
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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  
6
Example: 7 = 117649  
You Press  
You See  
×
117649  
7 = = = = =  
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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 num-  
ber 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: MEMORYappears 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 sub-  
tract, 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 MEMORYdisappears.  
Example:  
2392 + 576  
————— – 73 = –64.61582  
786 – 432  
You Press  
You See  
MRC MRC ON/C  
786 M+  
0.  
MEMORY 786.  
MEMORY 432.  
MEMORY 2392.  
MEMORY 2968.  
MEMORY 354.  
432 M–  
2392 +  
÷
576  
MRC  
MEMORY  
8.3841807  
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You Press  
73 =  
You See  
MINUS – MEMORY  
64.61582  
CONVERSION  
and  
let you select the conversion di-  
rection — 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  
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  
in  
You See  
5.5  
cm (7)  
2.1653543  
Example: 75/8 in = ? cm  
You Press  
You See  
19.3675  
÷
(
5
8 + 7 =  
in  
cm 7)  
Example: 12.8 m = ? ft  
You Press  
You See  
41.99475  
(
12.8  
ft  
m 8)  
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Example: 54 yd = ? m  
You Press  
yard  
You See  
(
54  
m M+)  
49.3776  
Weight  
Example: 630 lb = ? kg  
You Press  
You See  
630  
lb  
kg (.)  
285.768  
Example: 1 lb = ? kg  
You Press  
You See  
0.4536  
1
lb  
kg (.)  
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Volume  
Example: 389 ft3 = ? m3  
You Press  
ft3  
You See  
389  
m3(2)  
11.015313  
Example: 100 ml = ? (US) fl. oz  
You Press  
fl.oz  
You See  
100  
ml (–)  
3.3813484  
Example: 245 (US) gal = ? l  
You Press  
You See  
(
245  
gal  
l 3)  
927.423  
19  
 
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Temperature  
Example: 125°F = ? °C  
You Press  
°F  
You See  
(
)
125  
°C +/–  
51.666666  
Example: –35°C = ? °F  
You Press  
You See  
(
)
35 +/-  
°F  
°C +/–  
MINUS - 31.  
Area  
Example: 245 ft2 = ? m2  
You Press  
You See  
22.7605  
2
2
( )  
5
245  
ft  
m
20  
 
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Example: 1540 cm2 = ? ft2  
You Press  
You See  
2
2
( )  
4
1540  
in  
cm  
238.70047  
21  
 
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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 care-  
fully. 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 calcula-  
tor’s internal components can cause a mal-  
function 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 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 re-  
quired 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 screw-  
driver 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 but-  
ton-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 posi-  
tive (+) 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 manu-  
facturing defects in material and workmanship under nor-  
mal use for one (1) year from the date of purchase from  
RadioShack company-owned stores and authorized Ra-  
dioShack 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 ex-  
clusions may not apply to you.  
In the event of a product defect during the warranty pe-  
riod, take the product and the RadioShack sales receipt  
as proof of purchase date to any RadioShack store. Ra-  
dioShack 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 pur-  
chase price. All replaced parts and products, and prod-  
ucts on which a refund is made,  
(
)
Continued  
27  
 
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(
) become the property of RadioShack. New or  
Continued  
reconditioned parts and products may be used in the per-  
formance of warranty service. Repaired or replaced parts  
and products are warranted for the remainder of the origi-  
nal warranty period. You will be charged for repair or re-  
placement 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 in-  
structions, improper installation or maintenance, alter-  
ation, 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  
4/99  
We Service What We Sell  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
07A99  
Printed in China  
 

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