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Statistical Calculation Formulas
Type
Linear
y = a + bx
Exponential
y = a • e
bx
Logarithmic
y = a + b • ln x
Power
y = a • x
b
Inverse
y = a + b —
Quadratic
y = a + bx + cx
In the statistical calculation formulas, an error will occur when:
• The absolute value of the intermediate result or calculation result
is equal to or greater than 1 × 10
• 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.
ERROR 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 < (or >) automatically moves the cursor
back to the place in the equation where the error occurred. Edit the
equation or press ª to clear the equation.
Error Codes and Error Types
Syntax error (Error 1):
• An attempt was made to perform an invalid operation.
Ex. 2 @{
Calculation error (Error 2):
• The absolute value of an intermediate or final calculation result equals
100
or exceeds 10
.
• An attempt was made to divide by 0 (or an intermediate calculation
resulted in zero).
• The calculation ranges were exceeded while performing calculations.
Depth error (Error 3):
• The available number of buffers was exceeded. (There are 10 buffers*
for numeric values and 24 buffers for calculation instructions).
*5 buffers in STAT mode.
• Data items exceeded 100 in the statistics mode.
Equation too long (Error 4):
• The equation exceeded its maximum input buffer (142 characters).
An equation must be shorter than 142 characters.
Calculation Ranges
• Within the ranges specified, this calculator is accurate to ±1
of the least significant digit of the mantissa. However, a
calculation error increases in continuous calculations due
to accumulation of each calculation error. (This is the same
x
x
x
for y
,
¿ , n! , e
, ln , etc., where continuous calculations are
performed internally.)
Additionally, a calculation error will accumulate and become
larger in the vicinity of inflection points and singular points
of functions.
• Calculation ranges
±10
–99
~ ±9.999999999×10
If the absolute value of an entry or a final or intermediate result of a
calculation is less than 10
calculations and in the display.
BATTERY REPLACEMENT
Notes on Battery Replacement
Improper handling of batteries can cause electrolyte leakage or
explosion. Be sure to observe the following handling rules:
• Replace both batteries at the same time.
• Do not mix new and old batteries.
• Make sure the new batteries are the correct type.
• When installing, orient each battery properly as indicated in the
calculator.
• Batteries are factory-installed before shipment, and may be ex-
hausted before they reach the service life stated in the specifica-
tions.
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 Batteries
[EL-509W/531W/531WH] If the display has poor contrast, the
batteries require replacement.
[EL-531WG] If the display has poor contrast or nothing appears on
the display even when ª is pressed in dim lighting, it is time to
replace the batteries.
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 fluid 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 leaking batteries, remove them and store in a safe
place.
• Do not leave exhausted batteries inside the product.
Regression formula
1
x
2
100
.
99
and 0.
–99
, the value is considered to be 0 in
• Do not fit partially used batteries, and be sure not to mix
batteries of different types.
• Keep batteries out of the reach of children.
• Exhausted batteries left in the calculator may leak and damage
the calculator.
• Explosion risk may be caused by incorrect handling.
• Do not throw batteries into a fire as they may explode.
Replacement Procedure
1. Turn the power off by pressing @ F.
2. Remove two screws. (Fig. 1)
3. Slide the battery cover slightly and lift it to remove.
4. [EL-509W/531W/531WG] Remove the used batteries by pry-
ing them out with a ball-point pen or other similar pointed
device. (Fig. 2)
[EL-531WH] Remove the used battery.
5. [EL-509W/531W/531WG] Install two new batteries. Make sure
the "+" side is facing up.
[EL-531WH] 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).
• Make sure that the display appears as shown below. If the
display does not appear as shown, remove the batteries rein-
stall them and check the display once again.
(Fig. 1)
(Fig. 2)
Automatic Power Off Function
This calculator will turn itself off to save battery power if no key is
pressed for approximately 10 minutes.
SPECIFICATIONS
Calculations:
Scientific calculations, statistical calcula-
tions, etc.
Internal calculations:
Mantissas of up to 14 digits
Pending operations:
24 calculations 10 numeric values
(5 numeric values in STAT mode)
Power source:
[EL-509W/531W]
3V ¶ (DC):
Alkaline batteries (LR44 or equivalent) × 2
[EL-531WG]
Built-in solar cells
3 V ¶ (DC):
Backup batteries
(Alkaline batteries (LR44 or equivalent) × 2)
[EL-531WH]
1.5V ¶ (DC):
Heavy duty manganese battery
(size AA or R6) × 1
Power consumption:
[EL-509W/531W]
0.0002 W
[EL-531WH]
0.0001 W
Operating time:
[EL-509W/531W]
Approx. 5000 hours
[EL-531WH]
Approx. 17000 hours
when continuously displaying 55555. at
25°C (77°F).
Varies according to use and other factors.
Operating temperature: 0°C – 40°C (32°F – 104°F)
External dimensions:
[EL-509W/531W/531WG]
79.6 mm (W) × 154.5 mm (D) × 13.2 mm (H)
3-1/8" (W) × 6-3/32" (D) × 17/32" (H)
[EL-531WH]
79.6 mm (W) × 154.5 mm (D) × 18.2 mm (H)
3-1/8" (W) × 6-3/32" (D) × 23/32" (H)
Weight:
[EL-509W/531W]
Approx. 95 g (0.21 lb) (Including batteries)
[EL-531WG]
Approx. 97 g (0.22 lb) (Including batteries)
[EL-531WH]
Approx. 110 g (0.25 lb) (Including battery)
Accessories:
[EL-509W/531W/531WG]
Batteries × 2 (installed), operation manual,
quick reference card and hard case
[EL-531WH]
Battery × 1 (installed), operation manual,
quick reference card and hard case
FOR MORE INFORMATION ABOUT
SCIENTIFIC CALCULATOR
Visit our Web site.
http://sharp-world.com/calculator/
SHARP CORPORATION
(Fig. 3)
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