Sharp EL-W531HA User Manual

PRINTED IN CHINA / IMPRIMÉ EN CHINE / IMPRESO EN CHINA

07BGK (TINSE1278EHZZ)

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 
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.

• 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.

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

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”.

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.

 

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 

: @ "

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.

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.

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.

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.

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:
① Fractions (1

m

4, etc.) 

② Functions preceded by their argument 

(

−1

, 

2

, n!, etc.) 

③ 

, 

r ④ Implied multiplication of a memory 

value (2Y, etc.) 

⑤ Functions followed by their argument (sin, cos, 

etc.) 

⑥ Implied multiplication of a function (2sin 30, A

1

⎯

4

, etc.) 

⑦ nCr, nPr ⑧ 

×, ÷ ⑨ +, − ⑩ AND ⑪ OR, XOR, XNOR ⑫ =, 

M

+, M−, 

⇒

M, 

▶DEG, ▶RAD, ▶GRAD, DATA, CD, 

θ, 

, 

and other calculation ending instructions
•  If parentheses are used, parenthesized calculations have 

precedence over any other calculations.

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

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.

• 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).

•  The closing parenthesis ) just before = or m may 

be omitted.

•  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.

•  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.

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

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.
• 

θ, 

: X memory (

 or 

), Y memory (

θ or 

)

• Two 

´ 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.

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

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 @ :.

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.

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:

•  Before performing a calculation, select the angular unit.
•  The calculation result is automatically stored in the X and Y 

memories (

 or 

 in X memory, and 

θ or 

 in Y memory).

•  The results of coordinate conversions will be displayed as 

decimal numbers even in the WriteView editor.

Rectangular coord.

Polar coord.

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 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

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

Single-variable statistical calculation
Statistics of 

①.

Linear regression calculation
Statistics of 

① and ②. In addition, the estimate of 

 for a 

given 

 (estimate 

´) and the estimate of 

 for a given 

 

(estimate 

´).

Quadratic regression calculation
Statistics of 

① and ②, and coeffi cients 

, 

, 

 in the quadratic 

regression formula (

y 

= 

 

+ b

 

+ 

2

). (For quadratic 

regression calculations, no correlation coeffi cient (

) can be 

obtained.) When there are two 

´ 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 

① and ②. In addition, the estimate of y for a given 

 and the estimate of 

 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.)

①

–

Mean of samples (

 data)

Sample standard deviation (

 data)

σ

Population standard deviation (

 data)

Number of samples

Σ

Sum of samples (

 data)

Σ

2

Sum of squares of samples (

 data)

②

y–

Mean of samples (

y data)

Sample standard deviation (

y data)

σy

Population standard deviation (

y data)

Σy

Sum of samples (

y data)

Σy

2

Sum of squares of samples (

y data)

Σ

Sum of products of samples (

, y)

Correlation coeffi cient

Coeffi cient of regression equation

Coeffi cient of regression equation

Coeffi cient of quadratic regression equation

• Use ; and t to perform a variable calculation in STAT 

mode.

•  U does not function in STAT mode.

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 _.

Type

Regression formula

Linear

 

= 

 

+ bx

Quadratic

 

= 

 

+ bx + 

2

Euler exponential

 

= 

 

⋅ 

Logarithmic

 

= 

 

+ b ⋅ ln 

Power

 

= 

 

⋅ 

Inverse

 

= 

 

+ b 

1

⎯

General exponential

 

= 

 

⋅ b

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.

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.

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 (

+, −, ×, ÷, or +−×÷).

 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.

⋮

⋮

⋮

⋮

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
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 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.

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.

•  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 

r, n!, e

• 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.

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.

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.

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

Visit our Web site.
http://sharp-world.com/calculator/

SCIENTIFIC CALCULATOR

MODEL

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 

Data 

Frequency

Data set number
Data 

Frequency