Casio FX-820MS User manual

http://world.casio.com/edu_e/
fx-820MS
User's Guide
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CASIO ELECTRONICS CO., LTD.
Unit 6, 1000 North Circular Road,
London NW2 7JD, U.K.

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Safety Precautions
Be sure to read the following safety precautions before
using this calculator. Keep this manual handy for later
reference.
Caution
This symbol is used to indicate information that can
result in personal injury or material damage if ignored.
Batteries
•After removing the battery from the calculator, put it
in a safe place where it will not get into the hands of
small children and accidentally swallowed.
•Keep batteries out of the reach of small children. If
accidentally swallowed, consult with a physician im-
mediately.
•Never charge batteries, try to take batteries apart, or
allow batteries to become shorted. Never expose
batteries to direct heat or dispose of them by incin-
eration.
•Misuse of batteries can cause them to leak and dam-
age nearby items, and can create the risk of fire and
personal injury.
•Always make sure that the battery’s positive kand
negative lends are facing correctly when you load
it into the calculator.
•Remove the battery if you do not plan to use the
calculator for a long time.
•Use only the type of battery specified for this calcu-
lator in this manual.
Disposing of the Calculator
•Never dispose of the calculator by burning it. Doing
so can cause certain components to suddenly burst,
creating the risk of fire and personal injury.

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•The displays and illustrations (such as key markings)
shown in this User’s Guide are for illustrative purposes
only, and may differ somewhat from the actual items they
represent.
•The contents of this manual are subject to change with-
out notice.
•In no event shall CASIO Computer Co., Ltd. be liable to
anyone for special, collateral, incidental, or consequential
damages in connection with or arising out of the purchase
or use of these materials. Moreover, CASIO Computer
Co., Ltd. shall not be liable for any claim of any kind
whatsoever against the use of these materials by any
other party.
Handling Precautions
•Be sure to press the 5key before using the calcu-
lator for the first time.
•Even if the calculator is operating normally, replace
the battery at least once every three years.
A dead battery can leak, causing damage to and mal-
function of the calculator. Never leave a dead battery in
the calculator.
•The battery that comes with this unit discharges
slightly during shipment and storage. Because of
this, it may require replacement sooner than the
normal expected battery life.
•Low battery power can cause memory contents to
become corrupted or lost completely. Always keep
written records of all important data.
•Avoid use and storage in areas subjected to tem-
perature extremes.
Very low temperatures can cause slow display response,
total failure of the display, and shortening of battery life.
Also avoid leaving the calculator in direct sunlight, near
a window, near a heater or anywhere else it might be
exposed to very high temperatures. Heat can cause dis-
coloration or deformation of the calculator’s case, and
damage to internal circuitry.
•Avoid use and storage in areas subjected to large
amounts of humidity and dust.

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Take care never to leave the calculator where it might be
splashed by water or exposed to large amounts of hu-
midity or dust. Such conditions can damage internal cir-
cuitry.
•Never drop the calculator or otherwise subject it to
strong impact.
•Never twist or bend the calculator.
Avoid carrying the calculator in the pocket of your trou-
sers or other tight-fitting clothing where it might be sub-
jected to twisting or bending.
•Never try to take the calculator apart.
•Never press the keys of the calculator with a ball-
point pen or other pointed object.
•Use a soft, dry cloth to clean the exterior of the cal-
culator.
If the calculator becomes very dirty, wipe it off with a
cloth moistened in a weak solution of water and a mild
neutral household detergent. Wring out all excess mois-
ture before wiping the calculator. Never use thinner, ben-
zene or other volatile agents to clean the calculator. Do-
ing so can remove printed markings and can damage
the case.

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Contents
Safety Precautions .................................. 2
Handling Precautions ............................. 3
Two-line Display ...................................... 7
Before getting started... .......................... 7
kModes .................................................................... 7
kInput Capacity ........................................................ 8
kMaking Corrections During Input ........................... 8
kReplay Function ..................................................... 9
kError Locator .......................................................... 9
kMulti-statements .................................................... 9
kExponential Display Formats ............................... 10
kDecimal Point and Separator Symbols ................ 10
kInitializing the Calculator ...................................... 11
Basic Calculations ................................. 11
kArithmetic Calculations ......................................... 11
kFraction Operations .............................................. 11
kPercentage Calculations ...................................... 13
kDegrees, Minutes, Seconds Calculations ............ 14
kFIX, SCI, RND ..................................................... 15
Memory Calculations ............................ 16
kAnswer Memory ................................................... 16
kConsecutive Calculations .................................... 16
kIndependent Memory ........................................... 17
kVariables .............................................................. 17
Scientific Function Calculations.......... 18
kTr igonometric/Inverse Trigonometric Functions ... 18
kHyperbolic/Inverse Hyperbolic Functions ............ 19
kCommon and Natural Logarithms/Antilogarithms 19
kSquare Roots, Cube Roots, Roots, Squares,
Cubes, Reciprocals, Factorials, Random Numbers,
π, and Permutation/Combination ......................... 19

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kAngle Unit Conversion ......................................... 20
kCoordinate Conversion (Pol (x, y), Rec (r, θ)) ..... 21
kEngineering Notation Calculations ....................... 21
Statistical Calculations ......................... 22
Standard Deviation .................................................. 22
Regression Calculations .......................................... 24
Technical Information ........................... 28
kWhen you have a problem...... ............................. 28
kError Messages ................................................... 28
kOrder of Operations ............................................. 30
kStacks .................................................................. 31
kInput Ranges ....................................................... 32
Power Supply ........................................ 34
Specifications ........................................ 35

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The two-line display makes it possible to view
both the calculation formula and its result at
the same time.
•The upper line shows the calculation formula.
•The lower line shows the result.
A separator symbol is displayed every three digits when
the integer part of the mantissa has more than three dig-
its.
Before getting started...
kModes
Before starting a calculation, you must first enter the cor-
rect mode as indicated in the table below.
To perform this type of Perform this To enter
calculation: key operation: this mode:
Basic arithmetic calculations F1COMP
Standard deviation F2SD
Regression calculations F3REG
•Pressing the Fkey more than once displays additional
setup screens. Setup screens are described in the sec-
tions of this manual where they are actually used to
change the calculator setup.
•In this manual, the name of the mode you need to enter
in order to perform the calculations being described is
indicated in the main title of each section.
Example:
Two-line Display
SD
REG
Statistical
Calculations

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Note!
•To return the calculation mode and setup to the initial
defaults shown below, press AB2(Mode) =.
Calculation Mode: COMP
Angle Unit: Deg
Exponential Display Format: Norm 1
Fraction Display Format: ab/c
Decimal Point Character: Dot
•Mode indicators appear in the upper part of the display.
•Be sure to check the current calculation mode (SD, REG,
COMP) and angle unit setting (Deg, Rad, Gra) before
beginning a calculation.
kInput Capacity
•The memory area used for calculation input can hold 79
“steps.” One step is taken up each time you press a
number key or arithmetic operator key ( +, ,, -, \).
A Aor pkey operation does not take up a step, so
inputting AD, for example, takes up only one step.
•You can input up to 79 steps for a single calculation.
Whenever you input the 73rd step of any calculation,
the cursor changes from “_” to “k” to let you know
memory is running low. If you need to input more than
79 steps, you should divide your calculation into two or
more parts.
•Pressing the gkey recalls the last result obtained, which
you can use in a subsequent calculation. See “Answer
Memory” for more information about using the gkey.
kMaking Corrections During Input
•Useeand rto move the cursor to the location you
want.
•Press [to delete the number or function at the current
cursor position.
•Press AKto change to an insert cursor t. Inputting
something while the insert cursor is on the display in-
serts the input at the insert cursor position.
•Pressing AK, or =returns to the normal cursor from
the insert cursor.