Datexx DS-736II User manual

OWNER’S MANUAL
Please read before using
BIG Display 12 - Digit
Scientific Calculator
with
Fractional and Statistical
Functions
D S - 736II

Be sure to read the following safety precautions before
usign this calculator. Keep this manual handy for later
referenxce.
This symbol is used to indicate information that can
result in personal injury or material damage if ignored.
After removing the batteries from the calculator. Put
them in a safe place where there is no danger of
them getting into the hands of small children and
accidently swallowed.
Keep batteries out of the reach of small children. If
accidently 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
incineration.
Misuse of batteries can cause them to leak acid that
can cause damage to nearby items and creates the
possibility of fire and personal injury.
Always make sure that a battery's positive and
negative sides are facing correctly when you
load it into the calculator.
Remove the batteries if you do not plan to use the
calculator for a long time.
Use only the type of batteries specified for this cal-
culator in this manual.
Never dispose of the calculator by burning it. Doing
so can cause certain components to suddenly burst.
creating the danger of fire and personal injury.
The displays and illustrations (such as key markings)
shown in this Use's Guide are for illustrative pur-
poses only, and may differ somewhat from the actual-
Items they represent.
The contents of this manual are subject to change
without notice.
Caution
Batteries
Disposing of the Calculator
1
Safety Precautions
!

Be sure to use a thin pointed object to press the
RESET button on the back of the calculator before
using it for the first time.
Be sure to press the ON key before using the calcu-
lator for the first time.
Even if the calculator is operating normally, replace the
battery at least once every two years.
The battery that comes with this unit discharges
slightly during shipment and storage. Because
of this, it may require replacement sooner than the nor-
mal 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 tempera-
ture extremes.
Avoid use and storage in areas subjected to large
amounts of humidity and dust.
Dead battery ca leak, causing damage to and malfunc-
tion of the calcuator. Never leave the dead battery in the
calculator.
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-
come exposed to very high temperatures. Heat can
cause discoloration or deformation of the calculator's
case, and damage to internal circuitry.
Take care never to leave the calculator where it might
be splashed by water or exposed to large amounts of
humidity or dust. Such elements can damage internal
circuitry.
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 drop the calculator or otherwise subject it to
strong impact.
Never twist or bend the calculator.
Never try to take the calculator apart.
2
Handling
Precautions

Pen or other pointed object.
Use a soft, dry cloth to clean the exterior of the unit.
If the calculator becomes 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.
benzine or other volatile agents to clean the calculator.
Doing so can remove printed markings and damage the
case.
3
Never press the keys of the calculator with a ball-point

Safety Precautions 1
Handling Precautions 2
Two-Line Display 6
Before Starting Calculations 6
Modes
Input Capacity
Making Corrections During Input
Replay Function
Error Locator
Exponential Display Formats
Answer Memory
Basic Calculations
Memory Calculations
Independent Memory
Variables
Fraction Calculations
Fraction Calculations
Decimal-to-Fraction Conversions
Fraction-to-Decimal Calculations
Percentage Calculations
Scientific Function Calculations
Trigonometric/Inverse Trigonometric Funtions
6
7
7
7
8
8
8
8
8
9
9
9
9
10
10
10
10
11
Contents
4

Two-Line Display
You can simulaneously checkthe calculation
formula and itsanswer.
The first linedisplays the calculationformula.
The second linedisplays the answer.
Before Starting Calculations...
Modes
Application
Calculation modes
Normal calculations
Standard deviation
Calculations
Regression
calculations
Angle unit modes
Degrees
Radians
Grads
Display modes
Exponential notation
(Canceling FIX and
SCL
Specification)
Number of dicimal
Place specification
Mode
Name
Mode
Indicator
COMP
SD SD
REG REG
REG
RAD
GRA
NORM
FIX FIX
D
R
G
6

Note!
Mode indicators appear in the lower part of the
display.
The COMP, SD, and REG modes can be used
in combination with the angle unit modes.
Be sure to check the current calculation modes
(SD,REG,COMP) and angle unit mode
(DEG,RAD,GRA) before beginning a
calculation
Input capacity
The memory area used for calculation input
can hold 100 "steps." Whenever you input the
100rd step of any calculation: the cursor
changes from "-" to " " to let you know
memory is none. if you still need to input more,
you should divide your calculations into two or
more parts.
Making Corrections During Input
Use and to move the cursor to the
location you want.
Press to delete the number of function
at the current cursor position.
Press to change to an insert cursor
Inputting something while the insert cursor is
on the display inserts the input at the insert
cursor position.
Press , , or returns to the
normal cursor from the insert cursor.
Replay Function
Pressing or recalls the last calculation
you performed. You can then make any
changes you want in the calculation and re-
execute it.
Pressing does not clear replay memory, so you can
7
SCI SCI
Number of significant
digit specification
AC
DEL
INS
SHIFT
INS
SHIFT =

recall the last calculation even after you press
Replay memory is cleared whenever you start a new
calculation, change to another mode, or turn off power.
Error Locator
Pressing or after an error occurs displays the cal-
culation with the cursor positioned at the location where
the error occurred.
Exponential Display Formats
This calculator can display up to 10 digits. Larger values
are automatically displayed using exponential notation.
Answer Memory
Whenever you press after inputting values or an ex-
Pression, the calculated result is automatically stored in
Answer Memory.You canrecall Answer Memorycontents
by pressing .
Answer Memory can store up to 12 digits for the mantissa
and two digits for the exponent.
Answer Memory contents are not changed if the opera-
tion performed by any of the above key operations re-
sulis in an error.
.
.
AC
=
Ans
.
.
.
8
Use the COMP mode for basic calculations.
: 3X(5X10 )
3
Example 1 -9
Example 2 : 5X(9+7)
You can skip all operations before .
x
()= EXP
(-)
59 1.5-08
+
x
()
)
=
=
57
980.
Basic Calculations
.
.
.
.
Memory Calculations

Values are automatically displayed in decimal format
whenever the total number of digits of a fractional value
(integer + numerator + denominator + separator marks)
.
9
data assigned to variable A.
Example: 193.2 23 = 8.4
193.2 28 = 6.9
Use the COMP mode for fraction calculations.
Fraction Calculations
Values can be input directly into memory, added to
memory, or subtracted from memory. lndependent
momory is convenient for calculating cumulative totals.
lndependent memory uses the same memory area as
variable M.
To clear independent memory (M), input .
2 3 + 9 = 3 2 2 3
There are nine variables (A through F, M, X and Y),which
can be used to store data, constants, results, and othes
values.
Use the following operation to delete data assigned to all
nine variables : .
Use the following operation to delete data assigned to a
particular variable: This operation deletes the
Independent Memory
Variables
Example:
0 STO
0
STO M
A
32.
47.
90.
11.
STO
Mcl
SHIFT
M
RCL
M
M+
=
+
x
9
6
53 6 = 47
) 45 X 2 = 90
(Total) 11
53
45 2
SHIFT
M
.
.
.
.
.
.
.
STO
A
=
193.2 23
A
=
28 6.9
8.4
Fraction Calculations
.
ALPHA

10
e xceeds 10.
Fraction/decimal calculation results are always decimal.
Example: 2.75
Decimal-to-Fraction Conversion
Fraction-to-Decimal Conversion
=
=
Example 2 :
Example1:2
3
1.6
1.6 2.1
1
2
2
2
31
1
5
4
+
+4
5
1
+
+
15.
27
a
b
c
/
a
b
c
/
a
b
c
/
a
b
c
/
.
.
SHIFT
d/c
2.75
4.
23
4.
11
=
3
4
2
2.75
a
b
c
/
.
.
=
Example:
1
1
2
2
2. 1
0.5 (Fraction Decimal)
.
Use the COMP mode for percentage calculations.
1:To calculate 12% of 1500
2: To calculate what percentage of 880 is 660
=3.14159265359
Example
Example
Use the COMP mode for scientific function calculations.
p
Scientific Function Calculations
.
0.5
2.
1
Percentage Calculations
a
b
c
/
a
b
c
/
a
b
c
/

11
Example 3:
Example 4:
Example 1:
Example 2:
Example 2:
Press to display the following menu.
Hyperbolic/Inverse Hyperbolic
Functions
Angle Unit Conversion
.
.
.
.
.
Trigonometric/Inverse Trigonometric Functions
Example 1:sin63 52'41"

Pressing or converts the displayed value to
the corresponding angle unit.
To convert 4.25 radians to degrees
1 2 3
,,
Example :
Example 1:
Example 1
:
Example 2:
Example :2
Example 3:
Example :3
Example 4:
Example :4
Example :5
Square Roots, Cube Roots, Roots,
Squares Cubes, Reciprocals,
Factorials, Random Numbers and
Common and Natural Logarithms/
Antilogarithms
.
.
.
.
.
.
.
.
.
12

Example :6
Example :7
Example :8
Example :9
Example :1
Performing the same calculation using the specified
number of decimal places
To generate a random number between
0.000 and 0.999
Example (resurlts differ each time)
(Specifies three decimal places.)
(Calculation continues using 10
display digits)
(Internal rounding)
FIX, SCI, RND
.
.
.
.
.
.
Example : 5
.
13

Example2: 1 3 Displaying result with two significant
digits (SCI 2)
Press clear SCI specification.
Epecifying the exponent display
Pressing the ENG key or SHIFT followed by ENG
will cause the exponent display for the number being
displayed to change in multiples of 3
Coordinate Conversion (Poll(x,y), Rec (r, ))
Calculation results are automatically assigned to variables
E and F.
Example1: To convert polar coordinates
to rectangular coordinates (x,y) (DEG Mode)
swaps displayed value with value in
memory.
Example2: To convert rectangular coordinates (1, 3)
to polar coordinates (r, ) (RAD Mode)
swaps displayed value with value in
memory.
14
(r=2, =60 )

Permutation
Example: To determine how mny different 4 digit val-
use can be produced using the numbers 1 through 7
Numbers cannot be duplicated within the same 4 digit
value (1234 is allowed but 1123 is not)
Combination
Example: To determine how many different 4 member
groups can be organized in a group of 10 individuals
Statistical Calculations
Standard Deviation (SD Mode)
Press to enter the SD Mode for statistical
calculations using standard deviation.
Data input always starts with to clear statistical
memory
Input data is used to calculate values for
and which you can
recall using the key operations noted
nearby.
Example: To calculate and for the
following data :55,54,51,55,53,53,54,52
Enter SD Mode
15

(Sample Standard Deviation )
(Population Standard Deviation )
(Arithmetic Mean )
(Number of Data )
(Sum of Values )
(Sum of Squares of Values )
Data Input Precautions
inputs the same data twice
You can also input multiple entries of the same data us-
ing To input the data 11D ten times: for example,
Press 110 10
The above results can be obtained in any order, and not
neccessarly that shown above
To delete data you have just input, press
Regression Calculations (REG Mode)
Press to enter the REG Mode and then select one
of the following types.
:Linear regression
:Logarithmic regression
:Exponential regression
:Power regression
:Inverse regression
Data input always starts with to clear statistical memory.
The values produced by a regression calculation depend
on the values input, and results can be recalled using
the key operations shown in the table below.
16
1.407885953
1.316956719
53.375
8.
427.
22805.
.;
.;
CL
1
2
1
2

Regression coefficient A
Regression coefficient B
Regression coefficient
Regression coefficient C
Linear Regression
The regression formula for linear regression is: = A + B .x
Perform linear regression to deter-
mine the regression formula terms
and correlation coefficient for the
data nearby. Next, use the regres-
sion formula to estimate atmos-
pheric pressure at 18 C and tem-
y
Example:
perature at 1000 hPa.
(Memory Clear)
(Regression Coefficient A)
(Regression Coefficient B)
(Correlation Coefficient r)
(Atmospheric Pressure at 18 C)
(Temperature at 1000 hPa)
Atmospheric Pressure vs. Temperature
Enter REG Mode (Linear Regression)
.
17

18
You can perform sexagesimal calculations using degrees
(hours), minutes, and seconds, and convert between
sexagesimal and decimal values.
to convert the decimal value 2.258 to a
sexagesimal value
To perform the following calculation:
If calculation results are not what you expect or if an error
occurs, perform the following steps.
4.Check the formula you are working with to confirm it is
correct.
5.Enter the correct modes to perform the calculation and
try again.
If the above steps do not correct your problem, press the
RESET button on the back of the calculator to reset it.
Pressing the RESET button deletes all data stored in
calculator memory. Make sure you always keep written
copies of all important data.
Example 2:
Example 2:
When you have a problem......
Technical Information
2.258
2.258
SHIFT
=
2 15 28.8
Degrees,Minutes,Seconds
Calculations

The calculator is locked up while an error message is on
the display. Press to clear the error, or press or to
display the calculation and correct the problem. See"Er-
ror Locator" for details.
Calculation result is outside the allowable calculation
range.
Error Messages
Ma ERROR
Cause
Attempt to perform a function calculation using a value
that exceeds the allowable input range.
Attempt to perform an illogical operation (division by
zero, etc.).
Check your input values and make sure they are all
within the allowable ranges. Pay special attention to
values in any memory areas you are using.
Capacity of the numeric stack or operator stack is ex-
ceeded.
Simplify the calculation. The numeric stack has 10
levels and the operator stack has 24 levels.
Divide your calculation into two or more separate parts.
Attempt to perform an illegal mathematical operation.
Press or to display the calculation with the cursor
located at the location of the error. Make nec- essary
corrections.
Improper use of argument
Press or to display the location of the cause of
the error and make required corrections.
Action
Cause
Action
Cause
Action
Cause
Axtion
Stk ERROR
Syn ERROR
Arg ERROR
19
.
.
.
.
.
.
.
.
.
.
AC

20
Abbreviated multiplication format in front of , memory
Name, or variable name: 2 , 5A, A etc.
Type B functions:
With these functions, the function key is pressed and
then the value is entered.
Tan ,sinh, cosh,tanh,sinh ,cosh , tanh ,(_)
Abbreviated multiplication format in front of Type B
functions:2 3,Alog2 etc.
Permutation and combination: nPr,nCr
Other operations are performed from left to right.
Operations enclosed in parentheses are performed first.
This calculator uses memory areas, called "stacks,"to tem-
porarily store values (numeric stack,and commands (com-
mand stack)according to their precedence during calcu-
lations. The numeric stack has 10 levels and the command
stack has 24 levels. A stack error (Stk ERROR) occurs
whenever you try to perform a calculation that is so com-
plex that the capacity of a stack is exceeded.
This calculator is powered by single CR2025 button sell.
Operations of the same precedence are performed
from right to left.
Stacks
Power Supply
5
7
8
10
9
6
-1 -1
-1
,
,
x
+
4
Order of Operations
Calculations are performed in the following order of perc-
edence.
Coordinate transformation: Pol , )Rec ( , )
Type A functions:
With these functions, the value is entered and then the
function key is pressed.
Powers and roots: ,
(
1
2
3
x
x
x
y
r
y
x
xx!
2-1
,,,,,
,