CASIO FX-85MS (02) PDF DOCUMENT

Before using your CASIO FX-85MS, please keep the following points in mind:

• The displays and illustrations (such as key markings) shown in the User’s Guide are for illustrative purposes only, and may differ somewhat from the actual items they represent.

• The contents of the manual are subject to change without notice.

• Be sure to keep all user documentation handy for future reference.

When using your CASIO FX-85MS for the first time, you must first initialize it. Initializing the calculator deletes all data currently in memory and returns all settings to their initial defaults.

1. Press the [ON] key.

2. Press [SHIFT] [CLR] [2] [=]. (This clears the mode and memory.)

The screen should show “D” and “0.”.

Please observe the following battery safety precautions for your CASIO FX-85MS:

• Keep batteries out of the reach of small children.

• Use only the type of battery specified for this calculator in this manual.

• If a battery is swallowed, contact a physician immediately.

To ensure the longevity of your CASIO FX-85MS, please follow these handling guidelines:

• The figures on the display of the calculator indicate that battery power is low. Continued use of the calculator when the battery is low can result in improper operation. Replace the battery as soon as possible when the display figures are dim. 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 malfunction of the calculator. Never leave a dead battery in the calculator.

• The battery that comes with the calculator discharges slightly during shipment and storage. Because of this, it may require replacement sooner than the normal expected battery life.

• The calculator’s solar cell and built-in battery power the primary battery. Avoid using or storing the calculator in areas subjected to temperature extremes, and large amounts of humidity and dust.

• Do not subject the calculator to excessive impact, pressure, or bending.

Before using the CASIO FX-85MS calculator, slide its hard case downwards to remove it. You can then attach the hard case to the back of the calculator as shown in the illustration in the manual.

To Turn On: Press the [ON] key.

To Turn Off: Press [SHIFT] [AC] (OFF).

Auto Power Off: Your calculator will turn off automatically if you do not perform any operation for about 6 minutes.

Follow these steps to adjust the display contrast of your CASIO FX-85MS:

1. Press the [MODE] key repeatedly until you reach the setup screen shown below.

Disp 1

2. Press the [▷] key.

3. Press the number key [2] to select contrast adjustment (CONT).

4. Use the [◁] key to make the display darker and the [▷] key to make it lighter.

5. After achieving the desired setting, press the [AC] key.

It is important to adjust the display contrast if you find it difficult to read. Adjusting contrast does not impact battery power.

The indicators on the display of your CASIO FX-85MS provide information about the current status. Here is what each indicator means:

You need to be in the correct mode to perform the type of calculation you want. Use the [MODE] key to select the mode.

The default calculation mode is the COMP mode. Mode indicators appear in the upper part of the display.

Press the [MODE] key repeatedly to access the setup screens. You can configure settings for angle units, display digits, and exponential display format.

To specify the angle unit (Deg, Rad, Gra):

Press [MODE] [MODE] [MODE] [1]. Then press [1] for Degrees (Deg), [2] for Radians (Rad), or [3] for Grads (Gra). (90° = π/2 radians = 100 grads).

To specify the number of display digits (Fix, Sci, Norm):

Press [MODE] [MODE] [MODE] [2]. Then choose one of the following:

• [1] (Fix): Specifies the number of decimal places. Press a number key from 0 to 9. Values are rounded off to the specified number of places.

• [2] (Sci): Specifies the number of significant digits. Press a number key from 0 to 9. Values are rounded off to the specified number of digits.

• [3] (Norm): Cancels the Fix and Sci settings. Press [1] (Norm 1) or [2] (Norm 2) to specify the exponential display range. Norm 1 displays in exponential format outside the range of 10⁻² > |x|, |x| ≥ 10¹⁰. Norm 2 displays in exponential format outside the range of 10⁻⁹ > |x|, |x| ≥ 10¹⁰.

You can use the clear function on your CASIO FX-85MS to reset various settings and memories. Press [SHIFT] [CLR] and then select one of the following options:

“Scl” clears statistical memory only.

“Mcl” clears calculation mode and other setup settings, answer memory (Ans), independent memory (M), and all variable values.

“All” clears all memory and all settings, returning the calculator to its initial default state.

The CASIO FX-85MS performs calculations according to a specific priority sequence. When the priority of two expressions is the same, the calculation is performed from left to right.

To correct or clear an expression on your CASIO FX-85MS:

• Use the [◁] and [▷] keys to move the cursor to the location you want to change.

• Press the [DEL] key to delete the number or function at the current cursor position.

• Press the [AC] key to clear the entire expression you are inputting. Pressing [AC] does not clear the Answer Memory.

Your CASIO FX-85MS can handle various types of basic calculations.

Fraction Calculations:

• To input a mixed fraction like 1 1/2, press [1] [a b/c] [1] [a b/c] [2]. The result is 1┘1┘2.

• To convert a mixed fraction to an improper fraction, press [SHIFT] [d/c]. For 1┘1┘2, this gives 3┘2.

• To convert a fraction to a decimal, press the [a b/c] key. For 3┘2, this gives 1.5.

Percent Calculations:

• To find 20% of 150, input [150] [×] [20] [SHIFT] [%]. The result is 30.

• To calculate what percentage 660 is of 880, input [660] [÷] [880] [SHIFT] [%]. The result is 75.

Degree, Minute, Second (Sexagesimal) Calculations:

• You can perform calculations with sexagesimal values and convert between sexagesimal and decimal values.

• To add 2°20’30” and 39’30”, input: [2] [o ‘ “] [20] [o ‘ “] [30] [o ‘ “] [+] [39] [o ‘ “] [30] [o ‘ “] [=]. The result is 3°0’0”.

• To convert a decimal value like 2.255 to sexagesimal, input [2.255] [=] then [SHIFT] [o ‘ “]. The result is 2°15’18”.

• To convert a sexagesimal value like 2°15’18” to decimal, input [2] [o ‘ “] [15] [o ‘ “] [18] [o ‘ “] [=] then press [o ‘ “]. The result is 2.255.

The CASIO FX-85MS stores previous calculations in its Calculation History, which you can access using the Replay function.

Calculation History:

• The calculator has memory for up to 150 bytes of data for the newest calculation. When this memory is full, the oldest calculations are deleted to make room.

• After a calculation is executed, press [▲] or [▼] to scroll through the history of expressions and their answers.

Replay Function:

• While a previous calculation is displayed (by pressing [▲] or [▼]), you can press [◁] or [▷] to move the cursor and edit the expression.

• You can then press [=] to execute the edited calculation.

• Pressing [AC] while a previous calculation is displayed will clear the Calculation History.

The Answer Memory on your CASIO FX-85MS stores the result of the last calculation performed. Here’s how it works:

• The result obtained by pressing [=], [M+], [SHIFT] [M-], or [STO] followed by a variable key is automatically stored in the Answer Memory (Ans).

• The content of Ans memory is updated whenever a new calculation result is produced.

• You can recall the Ans memory content by pressing the [Ans] key. For example, to multiply the previous answer by 30, you would press [Ans] [×] [30] [=].

• The Answer Memory can store a value with up to 12 digits for the mantissa and 2 digits for the exponent.

• The contents of the Answer Memory are not cleared when you press the [AC] key or when you turn off the calculator.

Your CASIO FX-85MS has nine variables (A, B, C, D, E, F, X, and Y) and one independent memory (M) for storing data.

Using Variables (A, B, C, D, E, F, X, Y):

• To assign a value to a variable: Input the value, press [STO], then press the key corresponding to the desired variable name (e.g., [A]). Example: To assign 123 to variable A, press [123] [STO] [A].

• To recall a variable’s value: Press [RCL] and then the key for the variable name you want to recall (e.g., [A]).

• To use a variable in a calculation: Press [ALPHA] and then the key for the variable name (e.g., [ALPHA] [A]).

Using Independent Memory (M):

• To add a value to M: Input the value and press [M+].

• To subtract a value from M: Input the value and press [SHIFT] [M-].

• To recall the value in M: Press [RCL] [M].

Clearing Memory:

• To clear independent memory (M): Input [0] [STO] [M]. The “M” indicator on the display will disappear.

• To clear all variables: Press [SHIFT] [CLR] [2] (Mcl) [=]. This will clear independent memory M and all variables A through Y, as well as the Answer Memory.

The CASIO FX-85MS can perform a wide range of scientific function calculations. Ensure your angle unit is set correctly (Deg, Rad, Gra) before performing trigonometric calculations. Here are some examples:

• Pi (π): Press [SHIFT] [π]. For example, 3 × π = 9.424777961.

• Sine, Cosine, Tangent: To find sin(30°), ensure the calculator is in Degree mode, then press [sin] [30] [=]. Result: 0.5.

• Logarithm (log, ln): To find log(1.23), press [log] [1.23] [=]. Result: 0.089905111.

• Powers (x², x³, ^): To calculate 5.6², press [5.6] [x²] [=]. Result: 31.36. To calculate 5³, press [SHIFT] [³√] [5] [=]. Result: 125.

• Roots (√, ³√, x√): To find the square root of 2, press [√] [2] [=]. Result: 1.414213562. To find the cube root of 5, press [SHIFT] [³√] [5] [=]. Result: 1.709975947.

• Random Number (Ran#): Press [SHIFT] [Ran#] [=] to generate a 3-digit pseudo-random number between 0.000 and 0.999. To generate a random integer, for example between 1 and 100, input [100] [SHIFT] [Ran#] [=].

• Permutations (nPr) and Combinations (nCr): To find the number of permutations for choosing 4 people from a group of 10, press [10] [SHIFT] [nPr] [4] [=]. Result: 5040.

• Rectangular-to-Polar Conversion (Pol): To convert rectangular coordinates (√2, √2) to polar coordinates (r, θ), press [Pol(] [SHIFT] [√] [2] [SHIFT] [,] [SHIFT] [√] [2] [)] [=]. The result shows r=2, and pressing [RCL] [F] shows θ=45.

• Polar-to-Rectangular Conversion (Rec): To convert polar coordinates (r=2, θ=60°) to rectangular coordinates (x, y), press [SHIFT] [Rec(] [2] [SHIFT] [,] [60] [)] [=]. The result shows x=1, and pressing [RCL] [F] shows y=1.732050808.

To perform statistical calculations on your CASIO FX-85MS, you must first enter the correct mode.

1. Select a Mode:

• For single-variable statistics (standard deviation), press [MODE] [2] to enter SD Mode.

• For paired-variable statistics (regression), press [MODE] [3] to enter REG Mode. You can then select the type of regression: Lin (Linear), Log (Logarithmic), Exp (Exponential), Pwr (Power), Inv (Inverse), or Quad (Quadratic).

2. Clear Statistical Memory:

• Before starting a new data set, always press [SHIFT] [CLR] [1] (Scl) [=] to clear the statistical memory.

3. Input Data:

• Use the [DT] key to input data. For example, to input the value 55 in SD mode, press [55] [DT].

• For paired data in REG mode (e.g., X=10, Y=20), press [10] [,] [20] [DT].

• To input the same data multiple times, use a semicolon. For example, to input the value 110 twice, press [110] [SHIFT] [;] [2] [DT].

4. Obtain Statistical Values:

• After inputting your data, you can obtain various statistical values. Press [SHIFT] [S-SUM] to get sums (like Σx², Σx) or [SHIFT] [S-VAR] to get variables (like mean x̄, population standard deviation σx, sample standard deviation sx, and count n).

5. Obtain Estimated Values (REG Mode Only):

• Based on the regression formula, you can calculate estimated values for x and y. For a given x-value, input the value and press [SHIFT] [S-VAR] [▷] [▷] [2] (ŷ) to find the estimated y-value. Similarly, for a given y-value, find the estimated x-value with [SHIFT] [S-VAR] [▷] [▷] [1] (x̂).

The CASIO FX-85MS has the following specifications for its calculation capabilities:

• Calculation Range: ±1 × 10⁻⁹⁹ to ±9.999999999 × 10⁹⁹ or 0.

• Internal Calculation: Uses a 12-digit mantissa.

• Precision: In general, for a single calculation, precision is ±1 at the 10th digit. For exponential display, precision is ±1 at the least significant mantissa digit. Errors are cumulative in the case of consecutive calculations.

Function Input Ranges:

If an error occurs during a calculation, the calculator displays an error message. Press [◁] or [▷] to return to the calculation screen; the cursor will be positioned at the location of the error. Press [AC] to clear the error message and the calculation.

Math ERROR

• Cause: The intermediate or final result of the calculation you are performing exceeds the allowable calculation range. Your input exceeds the allowable input range (very large numbers). You are performing an illegal mathematical operation (such as division by zero).

• Action: Check the input values and reduce the number of digits. When using independent memory or a variable as the argument of a function, make sure that the memory or variable value is within the allowable range for the function.

Stack ERROR

• Cause: The calculation you are performing has caused the capacity of the numeric stack or the command stack to be exceeded.

• Action: Simplify the calculation formula. Try splitting the calculation into two or more parts.

Syntax ERROR

• Cause: There is a problem with the format of the calculation you are performing.

• Action: Make necessary corrections.

Arg ERROR

• Cause: Improper use of an argument.

• Action: Make necessary corrections.

If you experience problems with your CASIO FX-85MS, perform the following steps before assuming it is malfunctioning. If these steps do not correct the problem, contact your original retailer or a dealer.

1. Check the calculation expression to make sure it does not contain any errors.

2. Make sure that you are using the correct mode for the type of calculation you are trying to perform.

3. If the above steps do not correct your problem, press the [ON] key.

4. Initialize all modes and settings. To do this, press [SHIFT] [CLR] [2] (Mode) [=].

Replacing the battery will cause the contents of the calculator’s memory to be deleted. Follow these steps carefully to replace the battery in your CASIO FX-85MS:

1. Press [SHIFT] [AC] (OFF) to turn off the calculator.

2. To ensure that you do not accidentally turn on power while replacing the battery, slide the hard case onto the front of the calculator.

3. On the back of the calculator, remove the six screws and the battery cover. The battery is held in place by a plate.

4. Remove the old battery.

5. Wipe a new battery with a dry cloth and load it with its plus (+) and minus (-) ends facing correctly.

6. Replace the cover.

7. Initialize the calculator: Press [ON], then [SHIFT] [CLR] [2] (Mode) [=]. Do not skip this step.

Power Supply:

• fx-82MS/fx-85MS/fx-220 PLUS: Built-in solar cell; button battery LR44(GP76A) × 1

• fx-300MS/fx-350MS: Button battery LR44(GP76A) × 1

Approximate Battery Life:

• fx-82MS/fx-85MS/fx-220 PLUS: 3 years (based on 1 hour of operation per day).

• fx-300MS/fx-350MS: 9,000 hours continuous display of flashing cursor. 3 years (based on 1 hour of operation per day).

Power Consumption: 0.0001 W (fx-82MS/fx-85MS/fx-220 PLUS); 0.0002 W (fx-300MS/fx-350MS)

Operating Temperature: 0°C to 40°C (32°F to 104°F)

Dimensions (H × W × D):

• fx-82MS: 18.6 × 85 × 156 mm

• fx-85MS: 12.2 × 85 × 156 mm

• fx-220 PLUS: 18.6 × 78 × 155 mm

• fx-300MS: 12.2 × 85 × 156 mm

• fx-350MS: 12.2 × 85 × 156 mm

Approximate Weight:

• fx-82MS: 125 g

• fx-85MS: 115 g

• fx-220 PLUS: 115 g

• fx-300MS: 100 g

• fx-350MS: 100 g