# Sharp WRITEVIEW EL-W531 User Manual

## Sharp Calculators, organizers

PRINTED IN CHINA / IMPRIMÉ EN CHINE / IMPRESO EN CHINA

07BGK (TINSE1278EHZZ)

**INTRODUCTION**

Thank you for purchasing the SHARP Scientifi c 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

manual for use.

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 specifi ed

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**

** **

** **

** **

** **

Dot

matrix

display

Symbol

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

H has 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 ;, x or t has 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 J 3, then + or & to adjust the contrast.

Press j to exit.

**Power On and Off**

Press j to turn the calculator on. The data that was on-

screen when the power was turned off will appear on the display.

Press @ o to turn it off.

**Key Notations Used in this Manual**

In this manual, key operations are described as follows:

To specify

*e*

* x*: @ "

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

(Display)

A–F*

1

,

M, X, Y

D1–D4*

2

ANS STAT*

3

j

@ Z

Mode selection (b)

*

5

@ P 0*

4

@ P 1 0*

4

@ P 2 0*

4

RESET switch

: Clear

: Retain

*1 Press j x and 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 @ P to 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 1 0.

• To RESET the calculator, press 2 0. The RESET

operation will erase all data stored in memory and restore the

calculator’s default settings.

**ENTERING, DISPLAYING, AND EDITING THE 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 l or r to 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

entering values such as those in

the table to the right, results may be

shown using

r.

• Calculation results may extend off

the edges of the screen. You can

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 l or r to 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 l brings you to

the end of the equation and pressing r brings you to the

beginning. Press l, r, u, or d to move the

cursor. Press @ l or @ r to jump the cursor to the

beginning or the end of the equation.

In the WriteView editor, you can use u and d to 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 u will display the previous equation. Further

pressing u will display preceding equations (after returning to

the previous equation, press d to view equations in order). In

addition, @ u can be used to jump to the oldest equation,

and @ d to jump to the newest one.

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

• The multi-line memory will be cleared by the following operations:

@ Z , mode change, RESET, N-base conversion,

angular unit conversion, editor change (J 2 0 or

J 2 1), and memory clear (@ P 1 0).

• 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 (1

m

4, etc.)

Functions preceded by their argument

(

*x*

−1

,

*x*

2

, n!, etc.)

*y*

*x*, *x*r 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

⎯

4

, etc.)

nCr, nPr

Ч

,

ч

+

,

−

AND

OR, XOR, XNOR

=

,

M

+

, M

−

, M,

DEG,

RAD,

GRAD, DATA, CD,

*r*

θ

,

*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: b 0 (default)

Used to perform arithmetic operations and function calculations.

STAT mode: b 1

Used to perform statistical operations.

DRILL mode: b 2

Used to practice math and multiplication table drills.

**SET UP Menu**

Press J to display the SET UP

menu.

Press j to exit the SET UP menu.

**Determination of the angular unit**The following three angular units (degrees, radians, and grads)

can be specifi ed.

DEG (°):

J 0 0 (default)

RAD (rad): J 0 1

GRAD (g): J 0 2

**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 J 1 0 (FIX) or J 1 2 (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 J 1 1 (SCI) is pressed, “SIG(0–9)?” will be

displayed and the number of signifi cant digits can be set to any

value between 0 and 9. Entering 0 will set a 10-digit display.

**Setting the fl oating point number system in scientifi c notation**Two settings are used to display a fl oating-point number: NORM1

(the default) and NORM2. A number is automatically displayed in

scientifi c notation outside a preset range:

• NORM1 (J 1 3): 0.000000001

≤

| x |

≤

9,999,999,999

• NORM2 (J 1 4): 0.01

≤

| x |

≤

9,999,999,999

**Selecting the editor**Two editors are available in NORMAL mode:

• The WriteView editor (W-VIEW): J 2 0 (default)

• The Line editor (LINE): J 2 1

**Adjusting the display contrast**Press J 3, then + or & to adjust the contrast.

Press j to 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 J 4

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 b 0 to select NORMAL mode.

• In each example, press j to clear the display fi rst. Unless

otherwise specifi ed, calculation examples are performed in the

WriteView editor with the default display settings (@ P

0).

**Arithmetic Operations **

**4**

• The closing parenthesis ) just before = or m may

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 @ O or @ W in 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

j to exit.

**Random numbers**A pseudo-random number, with three signifi cant digits from 0

up to 0.999, can be generated by pressing @ w 0

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 @ w 1 e.

**Random coin**To simulate a coin fl ip, 0 (heads) or 1 (tails) can be randomly

generated by pressing @ w 2 e.

**Random integer**An integer between 0 and 99 can be generated randomly by

pressing @ w 3 e.

**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 (A–F, X and Y)**Press x and a variable key to store a value in memory.

Press t and 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 j x M to 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.

•

*r*

θ

,

*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 t or ; will recall the value stored in memory

using up to 14 digits.

**Defi nable memories (D1–D4)**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 j to

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 defi nable

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

m

A

, *

B

, A

C

, l

D

, i

E

, and H

F

.

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:

**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 scientifi c

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*

+

*b*

*x*

+

*cx*

2

). (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.)

*x*

–

Mean of samples (

*x*

data)

*sx*

Sample standard deviation (

*x*

data)

σ

*x*

Population standard deviation (

*x*

data)

*n*

Number of samples

Σ

*x*

Sum of samples (

*x*

data)

Σ

*x*

2

Sum of squares of samples (

*x*

data)

*y*

–

Mean of samples (

*y*

data)

*s*

*y*

Sample standard deviation (

*y*

data)

σ*y*

Population standard deviation (

*y*

data)

Σ*y*

Sum of samples (

*y*

data)

Σ*y*

2

Sum of squares of samples (

*y*

data)

Σ

*x*

*y*

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 t to perform a variable calculation in STAT

mode.

• U does 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* H *frequency* _ (To enter multiples of the same

data)

Two-variable data

*Data*

*x*

H *data*

*y*

_

*Data*

*x*

H *data*

*y*

H *frequency* _ (To enter multiples

of the same data

*x*

and

*y*

)

Note: Up to 100 data items can be entered. With the single-

variable 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 u and d to display the previously entered data set.

Press d to display the data set in ascending (oldest fi rst)

order. To reverse the display order to descending (latest fi rst),

press the u key. Press @ u or @ d to jump

the cursor to the beginning or end of the data set.

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

Display and move the cursor to the data item to be modifi ed

by using u and 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 u and d, then press

@ #. The data set will be deleted.

• To add a new data set, press j to 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*

+

*cx*

2

Euler exponential

*y*

=

*a*

⋅

*e*

*b*

*x*

Logarithmic

*y*

=

*a*

+

*b*

⋅

ln

*x*

Power

*y*

=

*a*

⋅

*x*

*b*

Inverse

*y*

=

*a*

+

*b*

1

⎯

*x*

General exponential

*y*

=

*a*

⋅

*b*

*x*

An error will occur when:

• The absolute value of the intermediate result or calculation

result is equal to or greater than 1

×

10

100

.

• 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: b 2 0

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): b 2 1

Questions from each row of the multiplication table (1 to 12) are

displayed serially or randomly.

To exit DRILL mode, press b and select another mode.

**Using Math Drill and **

**×**

** Table**

1. Press b 2 0 for Math Drill or b 2 1 for

×

Table.

2. **Math Drill**: Use u and d to select the number of

questions (25, 50, or 100).

**×**

**Table**: Use u and d to select a row in the

multiplication table (1 to 12).

3. **Math Drill**: Use l and r to select the operator type for

questions (

+

,

−

,

Ч

,

ч

, or

+−Чч

).

**Ч**

**Table**: Use l and r to select the order type (“Serial”

or “Random”).

4. Press e to 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 j or N to 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 e without 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 e and the number and percentage

of correct answers are displayed.

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

**Math Drill sample**

**×**

** Table sample**

**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 l or r automatically moves the cursor

back to the place in the equation where the error occurred. Edit

the equation or press j to 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 10

100

.

• 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 N or

@ y in the WriteView editor.

Ex. * 5 r A l N

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 specifi ed, 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 **

*y*

*x***, ***x*r**, n!, e**

*x*

**, ln, etc., where continuous calculations **

**are performed internally.)Additionally, a calculation error will accumulate and become larger in the vicinity of infl ection points and singular points of functions.**

• Calculation ranges

±

10

−99

to

±

9.999999999

×

10

99

and 0.

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:

±

a

P

b

⎯

e

±

c

P

d

⎯

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 j is 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:

(varies according to

use and other factors)

**EL-W531/W535**Approx. 3,000 hours when continuously

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/

**EL-W531EL-W531GEL-W531HEL-W531HAEL-W535**

SCIENTIFIC CALCULATOR

**OPERATION MANUAL**

MODEL

**ENGLISH**

Total remaining

questions

Question

See step 6 above.

Multiplicand

Order type

Percentage correct

Correct answers

Current question/

Total questions

Question

See step 6 above.

Number of questions

Operator type

Percentage correct

Correct answers

Entry value

DEG

multiples of 15

RAD

multiples of

1

⎯

12

π

GRAD

multiples of

50

⎯

3

Degree

Minute

Second

Data set number

Data

*x*

Data

*y*

Frequency

Data set number

Data

*x*

Frequency