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
65-538.fm Page 3 Monday, December 13, 1999 9:15 AM
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.
3
65-538.fm Page 4 Monday, December 13, 1999 9:15 AM
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.
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.
4
65-538.fm Page 5 Monday, December 13, 1999 9:15 AM
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.
5
65-538.fm Page 6 Monday, December 13, 1999 9:15 AM
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.
6
65-538.fm Page 7 Monday, December 13, 1999 9:15 AM
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.
7
65-538.fm Page 8 Monday, December 13, 1999 9:15 AM
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.
8
65-538.fm Page 9 Monday, December 13, 1999 9:15 AM
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.
9
65-538.fm Page 10 Monday, December 13, 1999 9:15 A
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
65-538.fm Page 11 Monday, December 13, 1999 9:15 A
You Press
36 –
You See
60.
×
MINUS 15.
75
8
–
÷
MINUS – 120.
MINUS– 13.333333
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
65-538.fm Page 12 Monday, December 13, 1999 9:15 A
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
65-538.fm Page 13 Monday, December 13, 1999 9:15 A
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 = = = = =
13
65-538.fm Page 14 Monday, December 13, 1999 9:15 A
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.
14
65-538.fm Page 15 Monday, December 13, 1999 9:15 A
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
15
65-538.fm Page 16 Monday, December 13, 1999 9:15 A
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
.
16
65-538.fm Page 17 Monday, December 13, 1999 9:15 A
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)
17
65-538.fm Page 18 Monday, December 13, 1999 9:15 A
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 (.)
18
65-538.fm Page 19 Monday, December 13, 1999 9:15 A
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
65-538.fm Page 20 Monday, December 13, 1999 9:15 A
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
65-538.fm Page 21 Monday, December 13, 1999 9:15 A
Example: 1540 cm2 = ? ft2
You Press
You See
2
2
( )
4
1540
in
cm
238.70047
21
65-538.fm Page 22 Monday, December 13, 1999 9:15 A
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.
22
65-538.fm Page 23 Monday, December 13, 1999 9:15 A
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.
23
65-538.fm Page 24 Monday, December 13, 1999 9:15 A
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.
24
65-538.fm Page 25 Monday, December 13, 1999 9:15 A
• 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.
25
65-538.fm Page 26 Monday, December 13, 1999 9:15 A
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.
26
65-538.fm Page 27 Monday, December 13, 1999 9:15 A
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
65-538.fm Page 28 Monday, December 13, 1999 9:15 A
(
) 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
|