Instruction/ maintenance manual of the product FX-250HC Casio
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CASIO ELECTRONICS CO., LTD. Unit 6, 1000 North Circular Road, London NW2 7JD, U.K..
— 1 — Contents Handling Precautions … 2 Modes … 3 Basic Calculations … 5 Constant Calculations … 6 Memory Calculations … 7 Fraction Calculations … 8 Percentage Calculations … 10 Scie.
— 2 — Handling Precautions •Y our calculator is made up of precision components. Ne v er try to take it apart. •A v oid dropping your calculator and otherwise subjecting it to strong impact. • Do not store the calculator or leave it in areas exposed to high temperature or humidity , or large amounts of dust.
— 3 — • Before assuming malfunction of the unit, be sure to care- fully reread this manual and ensure that the problem is not due to lo w batter y pow er or oper ational error . • The contents of this manual are subject to change without notice.
— 4 — Note! •A mode guide is located abo ve the display screen. • DEG, RAD, and GRA modes can be used in combination with the COMP and SD modes. • F9 does not exit SD mode. • F0 exits SD mode. • F0 does not clear SCI or FIX specifications.
— 5 — Basic Calculations • Use the COMP mode for basic calculations. • Example 1: 23 4.5 53 23 + 4.5 , 53 = • Example 2: 56 ( 12) ( 2.5) 56 - 12 E 2.5 E = • Example 3: 2 3 (1 10 20 ) 2 3 - 1 e 20 = • Example 4: 7 8 4 5=36 7 - 8 , 4 - 5 = • Example 5: =0.
— 6 — Constant Calculations • Press + , , , - ,or twice after inputting a number to make that number a constant. • “K” is on the display while a constant is being used. • Use the COMP mode for constant calculations. • Example 1: 2.3 3, then 2.
— 7 — Memor y Calculations • Use the COMP mode for memory calculations. • Use Y , | , A { and Z f or memory calculations . Y replaces current memory contents. • “M” appears when there is a v alue in memory . •T o clear memory , press 0 Y or t Y .
— 8 — • Example 3: To calculate the f ollowing using memory and a constant: (12 3) (45 3) (78 3) 135. (12 3) 3 - - 12 = Y (45 3) 45 A { (78 3) 78 | (Memory recall) Z Fraction Calculations • Use COMP mode for fraction calculations.
— 9 — • Example 4: 1.6 2.1 1 C 2 + 1.6 = Fraction/decimal calculation result is always decimal. • Example 5: ↔ 0.5 (Fraction ↔ Decimal) 1 C 2 = C C • Example 6: 1 ↔ 1 C 2 C 3 A B A B 2.1 1 2 1 2. 1 2. 0.5 1 2 1 2 3. 5 3. 2 3 5 3 1 2 3.
— 10 — Percentage Calculations • Use COMP mode for percentage calculations. • Example 1: To calculate 12% of 1500. 1500 - 12 A v • Example 2: To calculate what percentage of 880 is 660. 660 880 A v • Example 3: To add 15% onto 2500. 2500 - 15 A v + • Example 4: To discount 3500 by 25%.
— 11 — Scientific Function Calculations • Use COMP mode for scientific function calculations. • Some calculations may take a long time to complete. •W ait for result bef ore star ting next calculation. • =3.1415926536. k Sexagesimal ↔ Decimal Conversion • Example: 14°25’36” ↔ 14.
— 12 — Iog 64 Iog 4 .4 A Q + 5 - 3 E A U = 4.094622224 18.28545536 0.089905111 4.49980967 2.760821773 8. 0.125 22026.46579 3. k Hyperbolic/In verse Hyperbolic Functions • Example 1: sinh 3.6 3.6 M S • Example 2: sinh 1 30 30 M A j k Common and Natural Logarithms, Exponents • Example 1: log 1.
— 13 — • Example 8: log sin 40° +log cos 35° (DEG mode) 40 S R + 35 W R = A Q • Example 9: 8 1/3 8 A s 3 = k Square Roots, Cube Roots, Squares, Reciprocals and Factorials • Example 1: 2 .
— 14 — 0.00 FIX 2.47 FIX 40320. 3.3 –01 SCI 0.0 00 SCI • Example 5: 8! 8 A f k FIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234 1.234, rounding result to two places (FIX 2). F 7 2 1.234 + 1.234 = • Example 2: 1.234 1.
— 15 — 81.25 –03 0.664 1. DEG 2. 1.732050808 DEG 1.047197551 RAD 840. Example (results diff er each time) RAD • Example 5: To con v er t 0.08125 g rams to millig r ams. .08125 J • Example 6: To generate a random n umber betw een 0.000 and 0.
— 16 — 210. k Combination • Example: To determine how many diff erent 4-member groups can be organized in a group of 10 individuals. 10 A n 4 = Statisticasl Calculations (SD Mode) • Press Fl to enter the SD Mode for statistical calcula- tions using standard deviation.
— 17 — Arithmetic mean A ` Number of data A r Sum of values A o Sum of squares of values A a • }} inputs the same data twice (as above). •Y ou can also input m ultiple entr ies of the same data using - . To input the data 110 ten times , f or example, press 110 - 10 } .
— 18 — • Example 2: To change data you previously input. Correction Actual Correction 51 } 50 }A [ 51 } 130 - 31 } 130 - 31 } 120 - 120 - 31 t 130 - 31 } t 130 - 31 } 51 } 130 - 31 } 49 } 120 - .
— 19 — Clear (retains memory) ......................... k Number input ........................................ 0 – 9 , l Po w er off ............................................... i Po w er on; All clear ................................ t Sign change .
— 20 — • Scientific Functions Arc cosine ............................................. A V Arc sine ................................................. A j Arc tangent ............................................ A g Common antilogarithm .........
— 21 — Square .................................................. A K Square root ........................................... L T angent ................................................. h Permutation ........................................... A m Combination .
— 22 — • NORM 1 With NORM 1, exponential notation is automatically used for integer values with more than 10 digits and decimal values with more than two decimal places. • NORM 2 With NORM 2, exponential notation is automatically used for integer values with more than 10 digits and decimal values with more than nine decimal places.
— 23 — k Making Corrections During Calculations • If you make a mistake when inputting a value (but did not yet press an arithmetic operator key), press k to clear the value and then input the correct one. • In a series of calculations, press k while an intermediate result is displayed to clear only the last calculation per- formed.
— 24 — e. The total number of nested parentheses levels exceeds six, or when more than 18 pairs of parentheses are used. (“– 1 –” indicator appears on the displa y .) •T o clear any of the abov e conditions, press t and per- form the calculation from the beginning.
— 25 — • The batteries that come in the calculator when you pur- chase it are f or testing only . They may not pro vide full service life. • All data stored in memory is lost when you replace the batteries. Be sure to write down important data before re- placing the batteries.
— 26 — k Or der of Operations and Levels Operations are performed in the following order of prec- edence. 1. Functions 2. x y , x 1/y , R → P, P → R, n P r , n C r 3. , 4. , • Operations with the same precedence are performed from left to right, with operations enclosed in parentheses per- formed first.
— 27 — k Formulas, Rang es, and Con ventions The following are the formulas, ranges, and conventions that are applied to various calculations that can be performed using this calculator . Coordinate T ransformation • With polar coordinates, θ can be calculated within a range of –180° θ 180°.
— 28 — Permutation • Input range: n r 0 ( n , r : natural numbers) • Formula: n P r Combination • Input range: n r 0 ( n , r : natural numbers) • Formula: n C r P o.
— 29 — Input Range Functions tan –1 x sinh x cosh x tanh x sinh –1 x cosh –1 x tanh –1 x log x /ln x 10 x sin x cos x tan x sin –1 x cos –1 x x 1 10 100 x 230.2585092 x 1 10 100 x 1 For sinh and tanh,errors are cumulative and accuracy is af- fected at a certain point when x =0.
— 30 — –1 10 100 x 230.2585092 0 x 1 10 100 x 1 10 50 x 1 10 100 ; x ≠ 0 x 1 10 100 0 x 69 ( x is an integer) 0 .
— 31 — x 0: y ≠ 0 –1 10 100 1/ y log x 100 x 0: y 0 x 0: y 2 n 1; ( n ≠ 0; n is an integer) However: –1 10 100 1/ y log x 100 Input Rang e Functions x 1/ y a b / c SD 1 n T otal of integer , numerator, and denominator must be 10 digits or less (including division marks).
— 32 — Calculation Capacity: • Input/ Basic Calculations 10-digit mantissa; or 10-digit mantissa plus 2-digit expo- nent up to 10 ±99.
SA9707-B Printed in China Imprimé en Chine CASIO COMPUTER CO ., L TD . 6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan.
An important point after buying a device Casio FX-250HC (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Casio FX-250HC yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Casio FX-250HC - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Casio FX-250HC you will learn all the available features of the product, as well as information on its operation. The information that you get Casio FX-250HC will certainly help you make a decision on the purchase.
If you already are a holder of Casio FX-250HC, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Casio FX-250HC.
However, one of the most important roles played by the user manual is to help in solving problems with Casio FX-250HC. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Casio FX-250HC along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
