Sharp EL-W531, EL-W531G, EL-W531H, EL-W531HA, EL-W535 Owner Manual

ENGLISH

SCIENTIFIC CALCULATOR EL-W531

EL-W531G EL-W531H

EL-W531HA MODEL EL-W535

OPERATION MANUAL

PRINTED IN CHINA / IMPRIMÉ EN CHINE / IMPRESO EN CHINA 07BGK (TINSE1278EHZZ)

INTRODUCTION

Thank you for purchasing the SHARP Scientific Calculator Model EL-W531/W531G/W531H/W531HA/W535.

About the calculation examples (including some formulas and tables), refer to the reverse side of this English manual.

Refer to the number on the right of each title in the manual for use.

After reading this manual, store it in a convenient location for future reference.

Notes:

•Some of the models described in this manual may not be available in some countries.

•This product uses a period as a decimal point.

Operational Notes

•Do not carry the calculator around in your back pocket, as it may break when you sit down. The display is made of glass and is particularly fragile.

•Keep the calculator away from extreme heat such as on a car dashboard or near a heater, and avoid exposing it to excessively humid or dusty environments.

•Since this product is not waterproof, do not use it or store it where fl uids, for example water, can splash onto it. Raindrops, water spray, juice, coffee, steam, perspiration, etc. will also cause malfunction.

•Clean with a soft, dry cloth. Do not use solvents or a wet cloth.

•Do not drop it or apply excessive force.

•Never dispose of batteries in a fi re.

•Keep batteries out of the reach of children.

•This product, including accessories, may change due to upgrading without prior notice.

NOTICE

•SHARP strongly recommends that separate permanent written records be kept of all important data. Data may be lost or altered in virtually any electronic memory product under certain circumstances. Therefore, SHARP assumes no responsibility for data lost or otherwise rendered unusable whether as a result of improper use, repairs, defects, battery replacement, use after the specified battery life has expired, or any other cause.

•SHARP will not be liable nor responsible for any incidental or consequential economic or property damage caused by misuse and/or malfunctions of this product and its peripherals, unless such liability is acknowledged by law.

♦Press the RESET switch (on the back), with the tip of a ball-point pen or similar object, only in the following cases. Do not use an object with a breakable or sharp tip. Note that pressing the RESET switch erases all data stored in memory.

•When using for the fi rst time

•After replacing the battery

•To clear all memory contents

•When an abnormal condition occurs and all keys are

inoperative

If service should be required on this calculator, use only a SHARP servicing dealer, SHARP approved service facility, or SHARP repair service where available.

Hard Case

Remove the hard case, holding it with your fi ngers in the positions shown below.

DISPLAY

Symbol

Dot matrix display

Mantissa Exponent

•During actual use, not all symbols are displayed at the same time.

•Only the symbols required for the usage under instruction are shown in the display and calculation examples of this manual.

/ :	Indicates that some contents are hidden in the
/	directions shown.
2ndF:	Appears when @is pressed, indicating that the
	functions shown in orange are enabled.
HYP:	Indicates that Hhas been pressed and the
	hyperbolic functions are enabled. If @>is
	pressed, the symbols “2ndF HYP” appear, indicating
	that inverse hyperbolic functions are enabled.

ALPHA: Indicates that ;, xor thas been pressed, and entry (recall) of memory contents and recall of statistics can be performed.

DEG/RAD/GRAD: Indicates angular units.

BUSY: Appears during the execution of a calculation. W-VIEW: Indicates that the WriteView editor is selected.

M: Indicates that a numerical value is stored in the independent memory (M).

ENG/SCI/FIX/N2/N1: Indicates the notation used to display a value and changes by SET UP menu. N1 is displayed on-screen as “NORM1”, and N2 as “NORM2”.

BEFORE USING THE CALCULATOR

When using for the fi rst time, press the RESET switch (on the back), with the tip of a ball-point pen or similar object.

Adjusting the Display Contrast

Press J3, then +or &to adjust the contrast. Press jto exit.

Power On and Off

Press jto turn the calculator on. The data that was onscreen when the power was turned off will appear on the display. Press @oto turn it off.

Key Notations Used in this Manual

In this manual, key operations are described as follows:

To specify ex: @"

To specify ln: i

To specify E: ;E

•Functions that are printed in orange above the key require @to be pressed fi rst before the key. When you specify the memory, press ;fi rst. Numbers for input values are not shown as keys, but as ordinary numbers.

•Functions that are printed in gray adjacent to the keys are effective in specifi c modes.

The WriteView and Line Editors

This calculator has the following two editors in NORMAL mode: WriteView and Line. You can select between them in the SET UP menu.

The WriteView editor (default)

The Line editor

Note: In certain calculation examples, where you see the o symbol, the key operations and calculation results are shown as they would appear in the Line editor.

Clearing the Entry and Memories

Operation		Entry A–F*1, D1–D4*2			ANS	STAT*3
		(Display) M, X, Y
j		○	×	×	×	×
@Z		○	×	×	○	○
Mode selection (b)		○	×	×	×	×*5
@P0*4		○	×	×	×	×
@P10*4		○ ○ ○ ○ ○
@P20*4		○ ○ ○ ○ ○
RESET switch		○	○	○	○	○
○: Clear ×: Retain
*1	Press jxand then choose a memory to clear one
	variable memory.
*2	Defi nable memory. See “Memory Calculations”.
*3	Statistical data (entered data)
*4	See “Memory clear key”.
*5	Cleared when changing between sub-modes in STAT mode.

Memory clear key

Press @Pto display the menu.

•To initialize the display settings, press 0. The parameters set as follows:

•Angular unit: DEG

•Display notation: NORM1

•N-base: DEC

•To clear all variables and memories (A−F, M, X, Y, D1−D4, ANS, and STAT) at once, press 10.

•To RESET the calculator, press 20. The RESET operation will erase all data stored in memory and restore the calculator’s default settings.

ENTERING, DISPLAYING, AND EDITINGTHE EQUATION 1

The WriteView Editor

Entry and display

In the WriteView editor, you can enter and display fractions or certain functions as you would write them. Notes:

•The WriteView editor can only be used in NORMAL mode.

•If the equation grows too large, it may extend off the edge of the display after you obtain the result. If you want to see the entire equation, press lor rto return to the editing screen.

Displaying calculation results

When possible, calculation results will be displayed using fractions, r, and π. When you press U, the display will cycle through the following display styles:

•Mixed fractions (with or without π) → improper fractions (with or without π) → decimal numbers

•Proper fractions (with or without π) → decimal numbers

•Irrational numbers (square roots, fractions made using square roots) → decimal numbers

Notes:

•In the following cases, calculation results may be displayed using r:

•Arithmetic operations and memory calculations

•Trigonometric calculations

•	In trigonometric calculations, when		Entry value
	entering values such as those in
		DEG	multiples of 15
	the table to the right, results may be
	shown using r.	RAD	1
•			multiples of 12 π
	Calculation results may extend off	GRAD	50
	the edges of the screen. You can		multiples of
			3

see those parts by pressing l

or r(depending on whether the left or right portion is hidden).

•Improper/proper fractions will be converted to and displayed as decimal numbers if the number of digits used in their expression is greater than nine. In the case of mixed fractions, the maximum number of displayable digits (including integers) is eight.

•If the number of digits in the denominator of a fractional result that uses π is greater than three, the result is converted to and displayed as a decimal number.

The Line Editor

Entry and display

In the Line editor, you can enter and display equations line by line. Notes:

•Up to three lines of text may be viewed on the screen at one time.

•If the length of the equation exceeds three lines, parts of it may be hidden from view after calculation. If you want to see the rest of the equation, press lor rto return to the editing screen.

•In the Line editor, calculation results are displayed in decimal form.

Editing the Equation

Just after obtaining an answer, pressing lbrings you to the end of the equation and pressing rbrings you to the beginning. Press l, r, u, or dto move the

cursor. Press @lor @rto jump the cursor to the beginning or the end of the equation.

In the WriteView editor, you can use uand dto move the cursor up and down—between the numerator and denominator, for example.

Back space and delete key

To delete a number or function, move the cursor to the right of it, then press N. You can also delete a number or function that the cursor is directly over by pressing @y.

Multi-line Playback Function

2

This calculator is equipped with a function to recall previous equations and answers in NORMAL mode. A maximum of 340 characters can be stored in memory. When the memory is full, stored equations will be deleted to make room, starting with the oldest.

Pressing uwill display the previous equation. Further pressing uwill display preceding equations (after returning to the previous equation, press dto view equations in order). In addition, @ucan be used to jump to the oldest equation, and @dto jump to the newest one.

•To edit an equation after recalling it, press lor r.

•The multi-line memory will be cleared by the following operations: @Z, mode change, RESET, N-base conversion, angular unit conversion, editor change (J20or J21), and memory clear (@P10).

•Equations that have one result require an additional eleven characters’ worth of memory to store in order to hold the result.

•In addition to the amount of memory needed to store an equation, the WriteView editor will require a certain amount for the sake of display.

•Equations also include calculation ending instructions, such as “=”.

Priority Levels in Calculation

This calculator performs operations according to the following priority:

Fractions (1m4, etc.) Functions preceded by their argument (x−1, x2, n!, etc.) yx, xr Implied multiplication of a memory value (2Y, etc.) Functions followed by their argument (sin, cos,

etc.) Implied multiplication of a function (2sin 30, A 1 , etc.)

4

nCr, nPr ×, ÷ +, − AND OR, XOR, XNOR =, M+, M−, M, DEG, RAD, GRAD, DATA, CD, →rθ, →xy,

and other calculation ending instructions

•If parentheses are used, parenthesized calculations have precedence over any other calculations.

INITIAL SET UP

Mode Selection

NORMAL mode: b0(default)

Used to perform arithmetic operations and function calculations.

STAT mode: b1

Used to perform statistical operations.

DRILL mode: b2

Used to practice math and multiplication table drills.

SET UP Menu

Press Jto display the SET UP menu.

Press jto exit the SET UP menu.

Determination of the angular unit

The following three angular units (degrees, radians, and grads) can be specifi ed.

DEG (°): J00(default) RAD (rad): J01

GRAD (g): J02

Selecting the display notation and decimal places

3

Five display notation systems are used to display calculation results: Two settings of Floating point (NORM1 and NORM2), Fixed decimal point (FIX), Scientifi c notation (SCI), and Engineering notation (ENG).

•When J10(FIX) or J12(ENG) is pressed, “TAB(0–9)?” will be displayed and the number of decimal places (TAB) can be set to any value between 0 and 9.

•When J11(SCI) is pressed, “SIG(0–9)?” will be displayed and the number of significant digits can be set to any value between 0 and 9. Entering 0 will set a 10-digit display.

Setting the ßoating point number system in scientiÞc notation

Two settings are used to display a fl oating-point number: NORM1 (the default) and NORM2. A number is automatically displayed in scientific notation outside a preset range:

•NORM1 (J13): 0.000000001 ≤ | x | ≤ 9,999,999,999

•NORM2 (J14): 0.01 ≤ | x | ≤ 9,999,999,999

Selecting the editor

Two editors are available in NORMAL mode:

•The WriteView editor (W-VIEW): J20(default)

•The Line editor (LINE): J21

Adjusting the display contrast

Press J3, then +or &to adjust the contrast. Press jto exit.

Insert and overwrite entry methods

When using the Line editor, you can change the entry method from “INSERT” (the default) to “OVERWRITE”.

After you switch to the overwrite method (by pressing J4 1), the triangular cursor will change to a rectangular one, and the number or function underneath it will be overwritten as you make entries.

SCIENTIFIC CALCULATIONS

•Press b0to select NORMAL mode.

•In each example, press jto clear the display first. Unless otherwise specified, calculation examples are performed in the WriteView editor with the default display settings (@P 0).

Arithmetic Operations

4

•The closing parenthesis )just before =or mmay be omitted.

Constant Calculations

5

•In constant calculations, the addend becomes a constant. Subtraction and division are performed in the same manner. For multiplication, the multiplicand becomes a constant.

•In constant calculations, constants will be displayed as K.

Functions

6

•Refer to the calculation examples for each function.

•In the Line editor, the following symbols are used:

•: to indicate an expression’s power. (m, @",

@Y)

• : to separate integers, numerators, and denominators. (W, @k)

•When using @Oor @Win the Line editor, values are entered in the following way:

•logn (base, value)

•abs value

Random Function

The random function has four settings. (This function cannot be selected while using the N-base function.) To generate further random numbers in succession, press e. Press jto exit.

Random numbers

A pseudo-random number, with three significant digits from 0 up to 0.999, can be generated by pressing @w0 e.

Note: In the WriteView editor, the result will be a fraction or 0.

Random dice

To simulate a die-rolling, a random integer between 1 and 6 can be generated by pressing @w1e.

Random coin

To simulate a coin fl ip, 0 (heads) or 1 (tails) can be randomly generated by pressing @w2e.

Random integer

An integer between 0 and 99 can be generated randomly by pressing @w3e.

Angular Unit Conversions

7

Each time @]is pressed, the angular unit changes in sequence.

Memory Calculations

8

Memory calculations can be performed in NORMAL and STAT modes.

Temporary memories (AÐF, X and Y)

Press xand a variable key to store a value in memory. Press tand a variable key to recall the value from that memory. To place a variable in an equation, press ;and a variable key.

Independent memory (M)

In addition to all the features of temporary memories, a value can be added to or subtracted from an existing memory value. Press jxMto clear the independent memory (M).

Last answer memory (ANS)

The calculation result obtained by pressing =or any other calculation ending instruction is automatically stored in the last answer memory.

Notes:

•Calculation results from the functions indicated below are automatically stored in the X or Y memories replacing any existing values.

•→rθ, →xy: X memory (r or x), Y memory (θ or y)

•Two x´ values from a quadratic regression calculation in STAT mode: X memory (1:), Y memory (2:)

•Use of tor ;will recall the value stored in memory using up to 14 digits.

DeÞnable memories (D1ÐD4)

You can store functions or operations in defi nable memories (D1–D4).

•To store a function or operation, press x, followed by a defi nable memory key (I, J, K, or L), followed by the operation you want to store. Menu-related

operations, such as J, cannot be stored. Press jto return to the previous display.

•To call a stored function or operation, press the corresponding memory key. Calling a stored function will do nothing if the function that is called would be unusable in the current context.

•Any functions or operations that are stored in a definable memory will be replaced when you save a new one into that memory.

•When displaying and correcting a data set in STAT mode, you cannot store functions or operations in defi nable memories.

Chain Calculations

9

The previous calculation result can be used in the subsequent calculation. However, it cannot be recalled after entering multiple instructions.

Fraction Calculations

10

Arithmetic operations and memory calculations can be performed using fractions. In NORMAL mode, conversion between a decimal number and a fraction can be performed by pressing U.

Notes:

•Improper/proper fractions will be converted to and displayed as decimal numbers if the number of digits used in their expression is greater than nine. In the case of mixed fractions, the maximum number of displayable digits (including integers) is eight.

•To convert a sexagesimal value to a fraction, fi rst convert it by pressing @:.

Binary, Pental, Octal, Decimal, and Hexadecimal
Operations (N-base)	11

Conversions can be performed between N-base numbers in NORMAL mode. The four basic arithmetic operations, calculations with parentheses, and memory calculations can also be performed, along with the logical operations AND,

OR, NOT, NEG, XOR, and XNOR on binary, pental, octal, and hexadecimal numbers.

Conversion to each system is performed with the following keys:

@z(“BIN” appears), @r(“PEN” appears),

@g(“OCT” appears), @h(“HEX” appears),

@/(“BIN”, “PEN”, “OCT”, and “HEX” disappear)

Note: The hexadecimal numbers A–F are entered by pressing

A B C D E F

m, *, A, l, i, and H.

In the binary, pental, octal, and hexadecimal systems, fractional parts cannot be entered. When a decimal number having a fractional part is converted into a binary, pental, octal, or hexadecimal number, the fractional part will be truncated. Likewise, when the result of a binary, pental, octal, or hexadecimal calculation includes a fractional part, the fractional part will be truncated. In the binary, pental, octal, and hexadecimal systems, negative numbers are displayed as a complement.

Time, Decimal, and Sexagesimal Calculations 12

Conversion between decimal and sexagesimal numbers can be performed. In addition, the four basic arithmetic operations and memory calculations can be performed using the sexagesimal system. Notation for sexagesimal is as follows:

Degree											Second
				Minute
Coordinate Conversions									13

•Before performing a calculation, select the angular unit.

•The calculation result is automatically stored in the X and Y memories (r or x in X memory, and θ or y in Y memory).

•The results of coordinate conversions will be displayed as decimal numbers even in the WriteView editor.

Rectangular coord.							Polar coord.
Modify Function							14

Decimal calculation results are internally obtained in scientific notation, with up to 14 digits in the mantissa. However, since calculation results are displayed in the form designated by the display notation and the number of decimal places indicated, the internal calculation result may differ from that shown in the display. By using the modify function (@n), the internal value is converted to match that of the display, so that the displayed value can be used without change in subsequent operations.

•When using the WriteView editor, if the calculation result is displayed using fractions or irrational numbers, press U to convert it to decimal form fi rst.

STATISTICAL CALCULATIONS

Statistical calculations can be performed in STAT mode. There are eight sub-modes within STAT mode. Press b 1, then press the number key that corresponds to your choice:

0(S#a# 0 [SD]): Single-variable statistics 1(S#a# 1 [LINE]): Linear regression 2(S#a# 2 [QUAD]): Quadratic regression

3(S#a# 3 [E_EXP]): Euler exponential regression 4(S#a# 4 [LOG]): Logarithmic regression

5(S#a# 5 [POWER]): Power regression

6(S#a# 6 [INV]): Inverse regression

7(S#a# 7 [G_EXP]): General exponential regression

Statistical Calculations and Variables

15

The following statistics can be obtained for each statistical calculation (refer to the table below):

Single-variable statistical calculation

Statistics of .

Linear regression calculation

Statistics of and . In addition, the estimate of y for a given x (estimate y´) and the estimate of x for a given y (estimate x´).

Quadratic regression calculation

Statistics of and , and coeffi cients a, b, c in the quadratic regression formula (y = a + bx + cx2). (For quadratic regression calculations, no correlation coeffi cient (r) can be obtained.) When there are two x´ values, each value will be displayed with “1:” or “2:”, and stored separately in the X and Y memories.

Euler exponential regression, logarithmic regression, power regression, inverse regression, and general exponential regression calculations

Statistics of and . In addition, the estimate of y for a given x and the estimate of x for a given y. (Since the calculator converts each formula into a linear regression formula before actual calculation takes place, it obtains all statistics, except coeffi cients a and b, from converted data rather than entered data.)

		–	Mean of samples (x data)
		x
		sx	Sample standard deviation (x data)
		σx	Population standard deviation (x data)
		n	Number of samples
		Σ x	Sum of samples (x data)
		Σ x2	Sum of squares of samples (x data)
		–	Mean of samples (y data)
		y
		sy	Sample standard deviation (y data)
		σy	Population standard deviation (y data)
		Σy	Sum of samples (y data)
		Σy2	Sum of squares of samples (y data)
		Σ xy	Sum of products of samples (x, y)
		r	Correlation coeffi cient
		a	Coeffi cient of regression equation
		b	Coeffi cient of regression equation
		c	Coeffi cient of quadratic regression equation

•Use ;and tto perform a variable calculation in STAT mode.

•Udoes not function in STAT mode.

Data Entry and Correction

16

Before entering new data, clear the memory contents.

Data entry

Single-variable data

Data _

Data Hfrequency _(To enter multiples of the same data)

Two-variable data

Data x Hdata y _

Data x Hdata y Hfrequency _(To enter multiples of the same data x and y)

Note: Up to 100 data items can be entered. With the singlevariable data, a data item without frequency assignment is counted as one data item, while an item assigned with frequency is stored as a set of two data items. With the two-variable data, a set of data items without frequency assignment is counted as two data items, while a set of items assigned with frequency is stored as a set of three data items.

Data correction

Correction before pressing _immediately after a data entry: Delete incorrect data with j, then enter the correct data.

Correction after pressing _:

Use uand dto display the previously entered data set. Press dto display the data set in ascending (oldest first) order. To reverse the display order to descending (latest first), press the ukey. Press @uor @dto jump the cursor to the beginning or end of the data set.

Each data set is displayed with “X:”, “Y:”, or “F:”.

Data set number

Data x

Frequency

Data set number

Data x

Data y

Frequency

Display and move the cursor to the data item to be modifi ed by using uand d, input the correct value, then press _or e.

•To delete a data set, display and move the cursor to an item of the data set to delete by using uand d, then press @#. The data set will be deleted.

•To add a new data set, press jto exit the display of previously entered data and input the values, then press _.

Statistical Calculation Formulas		17
Type	Regression formula
Linear	y = a + bx
Quadratic	y = a + bx + cx2
Euler exponential	y = a ebx
Logarithmic	y = a + b ln x
Power	y = a xb
	1
Inverse	y = a + b x
General exponential	y = a bx

An error will occur when:

•The absolute value of the intermediate result or calculation result is equal to or greater than 1 × 10100.

•The denominator is zero.

•An attempt is made to take the square root of a negative number.

•No solution exists in the quadratic regression calculation.

DRILL MODE

Math Drill: b20

Math operation questions with positive integers and 0 are displayed randomly. It is possible to select the number of questions and operator type.

Multiplication Table (× Table): b21

Questions from each row of the multiplication table (1 to 12) are displayed serially or randomly.

To exit DRILL mode, press band select another mode.

Using Math Drill and ×Table

1.Press b20for Math Drill or b21for

×Table.

2.Math Drill: Use uand dto select the number of questions (25, 50, or 100).

×Table: Use uand dto select a row in the multiplication table (1 to 12).

3.Math Drill: Use land rto select the operator type for questions (+, −, ×, ÷, or + −×÷).

×Table: Use land rto select the order type (“Serial” or “Random”).

4.Press eto start.

When using Math Drill or × Table (random order only), questions are randomly selected and will not repeat except by chance.

5.Enter your answer. Press jor Nto clear the entered number and then enter the correct answer.

6.Press e.

•If the answer is correct, “” appears and the next question is displayed.

•If the answer is wrong, “”appears and the same question is displayed. This will be regarded as an incorrect answer.

•If you press ewithout entering an answer, the correct answer is displayed and then the next question is displayed. This will be regarded as an incorrect answer.

7.Continue answering the series of questions by entering the answer and pressing e.

8.After you fi nish, press eand the number and percentage of correct answers are displayed.

9.Press eto return to the initial screen for your current drill.

Math Drill sample

Current question/

Total questions

Question

…

See step 6 above.

…

Number of questions

Operator type

Percentage correct Correct answers

×Table sample

Total remaining questions

Question

…

See step 6 above.

…

Multiplicand

Order type

Percentage correct

Correct answers

Ranges of Math Drill Questions

The range of questions for each operator type is as follows.

+Addition operator: “0 + 0” to “20 + 20”

]	Subtraction operator: “0 − 0” to “20 − 20”; answers are
	positive integers and 0.

>Multiplication operator: “1 × 0” or “0 × 1” to “12 × 12”

)	Division operator: “0 ÷ 1” to “144 ÷ 12”; answers are
	positive integers from 1 to 12 and 0, dividends of up to
	144, and divisors of up to 12.
+]>)	Mixed operators: Questions within all the above
	ranges are displayed.

ERRORS AND CALCULATION RANGES

Errors

An error will occur if an operation exceeds the calculation ranges, or if a mathematically illegal operation is attempted. When an error occurs, pressing lor rautomatically moves the cursor back to the place in the equation where the error occurred. Edit the equation or press jto clear the equation.

Error codes and error types

ERROR 01: Syntax error

•An attempt was made to perform an invalid operation. Ex. 2 +&5 =

ERROR 02: Calculation error

•The absolute value of an intermediate or fi nal calculation result equals or exceeds 10100.

•An attempt was made to divide by zero (or an intermediate calculation resulted in zero).

•The calculation ranges were exceeded while performing calculations.

ERROR 03: Nesting error

•The available number of buffers was exceeded. (There are 10 buffers for numeric values and 64 buffers for calculation instructions).

ERROR 04: Data over

• Data items exceeded 100 in STAT mode.

Alert Messages

18

Cannot delete!

•The selected item cannot be deleted by pressing Nor @yin the WriteView editor.

Ex. *5 rAlN

In this example, delete the exponent before attempting to delete the parentheses.

Cannot call!

•The function or operation stored in defi nable memory (D1 to D4) cannot be called.

Ex. An attempt was made to recall a statistical variable from within NORMAL mode.

Buffer full!

•The equation (including any calculation ending instructions) exceeded its maximum input buffer (159 characters in the WriteView editor or 161 characters in the Line editor). An equation may not exceed its maximum input buffer.

Calculation Ranges		19
•	Within the ranges speciÞed, this calculator is accurate to
	±1 of the 10th digit of the mantissa. However, a calculation
	error increases in continuous calculations due to
	accumulation of each calculation error. (This is the same
	for yx, xr, n!, ex, ln, etc., where continuous calculations
	are performed internally.)
	Additionally, a calculation error will accumulate and
	become larger in the vicinity of inßection points and
	singular points of functions.
•	Calculation ranges	× 1099 and 0.
	±10−99 to ±9.999999999

If the absolute value of an entry or a fi nal or intermediate result of a calculation is less than 10−99, the value is considered to be 0 in calculations and in the display.

Display of results using r

Calculation results may be displayed using r when all of the following conditions are met:

•When intermediate and fi nal calculation results are displayed in the following form:

±aPb ± cPd

e f

• When each coeffi cient falls into the following ranges: 1 ≤ a < 100; 1 < b < 1,000; 0 ≤ c < 100;

1 ≤ d < 1,000; 1 ≤ e < 100; 1 ≤ f < 100

•When the number of terms in the intermediate and fi nal calculation results is one or two.

Note: The result of two fractional terms that include r will be reduced to a common denominator.

BATTERY REPLACEMENT

Notes on Battery Replacement

Improper handling of batteries can cause electrolyte leakage or explosion. Be sure to observe the following handling rules:

•Make sure the new battery is the correct type.

•When installing, orient the battery properly as indicated in the calculator.

•The battery is factory-installed before shipment, and may be exhausted before it reaches the service life stated in the specifi cations.

Notes on erasure of memory contents

When the battery is replaced, the memory contents are erased. Erasure can also occur if the calculator is defective or when it is repaired. Make a note of all important memory contents in case accidental erasure occurs.

When to Replace the Battery

EL-W531/W531H/W531HA/W535: If the display has poor contrast even after adjusting the display contrast, the battery requires replacement.

EL-W531G: If the display has poor contrast or nothing appears on the display when jis pressed in dim lighting, even after adjusting the display contrast, it is time to replace the battery.

Cautions

•Fluid from a leaking battery accidentally entering an eye could result in serious injury. Should this occur, wash with clean water and immediately consult a doctor.

•Should fl uid from a leaking battery come in contact with your skin or clothes, immediately wash with clean water.

•If the product is not to be used for some time, to avoid damage to the unit from a leaking battery, remove it and store in a safe place.

•Do not leave an exhausted battery inside the product.

•Keep batteries out of the reach of children.

•An exhausted battery left in the calculator may leak and damage the calculator.

•Explosion risk may be caused by incorrect handling.

•Do not throw batteries into a fi re as they may explode.

Replacement Procedure

1.Turn the power off by pressing @o. 2.Remove the two screws. (Fig. 1)

3.Slide the battery cover slightly and lift it to remove.

4.EL-W531/W531G/W535: Remove the used battery by prying it out with a ball-point pen or other similar pointed device. (Fig. 2)

EL-W531H/W531HA: Remove the used battery.

5.EL-W531/W531G/W535: Install one new battery. Make sure the “+” side is facing up.

EL-W531H/W531HA: Install one new battery. First insert the “−” side toward the spring. (Fig. 3)

6.Replace the cover and screws.

7.Press the RESET switch (on the back) with the tip of a ball-point pen or similar object.

8.Adjust the display contrast. See “Adjusting the Display

Contrast”.

•Make sure that the display appears as shown below. If the display does not appear as shown, remove the battery, reinstall it, and check the display once again.

Fig. 1

Fig. 2

Fig. 3

Automatic Power Off Function

This calculator will turn itself off to save battery power if no key is pressed for approximately 10 minutes.

SPECIFICATIONS

Calculation features:	Scientifi c calculations, statistical
	calculations, etc.
Drill features:	Math Drill and Multiplication Table
Display:	96 × 32 dot matrix liquid crystal display
Display of calculation results:
	Mantissa: 10 digits
	Exponent: 2 digits
Internal calculations:	Mantissas of up to 14 digits
Pending operations:	64 calculations 10 numeric values
Power source:	EL-W531/W535
	1.5 V —… (DC): Alkaline battery (LR44 or
	equivalent) × 1
	EL-W531G
	Built-in solar cells
	1.5 V —… (DC): Backup battery
	(Alkaline battery (LR44 or equivalent) × 1)
	EL-W531H/W531HA
	1.5 V —… (DC): Heavy duty manganese
	battery (size AAA or R03) × 1
Power consumption:	EL-W531/W531H/W531HA/W535
	0.00011 W
Operating time:	EL-W531/W535
(varies according to	Approx. 3,000 hours when continuously

use and other factors) displaying 55555. at 25°C (77°F)

EL-W531G

Approx. 3,000 hours when continuously displaying 55555. at 25°C (77°F), using the alkaline battery only

EL-W531H/W531HA

Approx. 17,000 hours when continuously displaying 55555. at 25°C (77°F)

Operating temperature: 0°C–40°C (32°F–104°F) External dimensions: 79.6 mm (W) × 161.5 mm (D) ×

15.5 mm (H)

3-1/8” (W) × 6-11/32” (D) × 5/8” (H) Weight: EL-W531/W535

Approx. 100 g (0.22 lb) (including battery)

EL-W531G

Approx. 102 g (0.23 lb) (including battery)

EL-W531H/W531HA

Approx. 107 g (0.24 lb) (including battery)

Accessories:	Battery × 1 (installed), operation
	manual, and hard case

FOR MORE INFORMATION ABOUT SCIENTIFIC CALCULATORS

Visit our Web site.

http://sharp-world.com/calculator/