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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
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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 cal- culator 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 cal- culator has dual-function keys to perform 20 built-in metric conversion calculations. CONTENTS Keys and Functions ...................
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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
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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. hectar
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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
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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
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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
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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 ca
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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
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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 You Press You See 256 + 378 = 634. 471 – 223 = 248. 15.5 · 2.3 = 35.65 17.2 ÷ 2.5 = 6.88 24 + 24. 10
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65-538.fm Page 11 Monday, December 13, 1999 9:15 AM You Press You See 60. 36 – 75 · MINUS – 15. ÷ MINUS 120. 8 – 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. 5 ·· 7 = 9 = 45. 50. 10 = ÷ 20. 100 5 = 11
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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. You Press You See 540 + 30 % 702. 12
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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 ÷ = 0.125 Exponent 6 Example: 7 = 117649 You Press You See 7· = = = = = 117649 13
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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 num- ber or calculation you want to add, then M+ press . 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 v
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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 8.3841807 15
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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 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
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65-538.fm Page 17 Monday, December 13, 1999 9:15 AM Length Example: 5.5 cm = ? in You Press You See 5.5 in cm (7) 2.1653543 5 Example: 7 /8 in = ? cm You Press You See ÷ ( 5 8 + 7 = in cm 7) 19.3675 Example: 12.8 m = ? ft You Press You See ( 12.8 ft m 8) 41.99475 17
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65-538.fm Page 18 Monday, December 13, 1999 9:15 AM Example: 54 yd = ? m You Press You See 54 yard 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 1 lb kg (.) 0.4536 18
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65-538.fm Page 19 Monday, December 13, 1999 9:15 AM Volume 3 3 Example: 389 ft = ? m You Press You See 3 3 389 ft m (2) 11.015313 Example: 100 ml = ? (US) fl. oz You Press You See 100 fl.oz ml (–) 3.3813484 Example: 245 (US) gal = ? l You Press You See 245 gal l (3) 927.423 19
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65-538.fm Page 20 Monday, December 13, 1999 9:15 AM Temperature Example: 125°F = ? °C You Press You See 125 °F °C (+/–) 51.666666 Example: –35°C = ? °F You Press You See 35 +/- °F °C(+/–) MINUS - 31. Area 2 2 Example: 245 ft = ? m You Press You See 2 2 245 ft m (5) 22.7605 20
