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.
65-538.fm Page 2 Monday, December 13, 1999 9:15 AM 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 ............................
65-538.fm Page 3 Monday, December 13, 1999 9:15 AM 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.
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. 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.
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 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.
5-538.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 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.
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, 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.
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 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”).
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 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.
65-538.fm Page 10 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 11 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 12 Monday, December 13, 1999 9:15 AM You Press You See 200 = 40. 300 = 60. Percentage Example: 20% of 720 is 144. You Press You See 720 × 20 % 144 Add-On Example: 30% added to 540 is 702. 12 You Press You See 540 + 30 % 702.
65-538.fm Page 13 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 14 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 15 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 16 Monday, December 13, 1999 9:15 AM 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 .
65-538.fm Page 17 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 18 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 19 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 20 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 21 Monday, December 13, 1999 9:15 AM 2 2 Example: 1540 cm = ? ft You Press 2 1540 in You See 2 cm (4) 238.
65-538.fm Page 22 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 23 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 24 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 25 Monday, December 13, 1999 9:15 AM • 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.
65-538.fm Page 26 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 27 Monday, December 13, 1999 9:15 AM 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.
65-538.fm Page 28 Monday, December 13, 1999 9:15 AM (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.
