Citizen SR-270N User manual

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Table of Contents
General Guide
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2
2
Turning on or off
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2
2
Battery replacement
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2
2
Auto power-off function
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2
2
Reset operation
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2
2
Contrast adjustment
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3
3
Display readout
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3
3
Before starting calculation
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4
4
Mode Selection
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4
4
Using “ 2nd ” keys
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4
4
Cursor
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4
4
Making corrections during input
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4
4
Replay function
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5
5
Error position display function
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5
5
Memory calculation
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5
5
Stack
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6
6
Order of operations
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6
6
Accuracy and Capacity
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6
6
Error conditions
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8
8
Basic Calculation
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8
8
Arithmetic calculation
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8
8
Parentheses calculations
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9
9
Percentage calculation
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9
9
Display formats
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9
9
Continuous calculation function
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1
1
0
0
Answer function
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1
1
0
0
Scientific Calculation
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1
1
0
0
Logarithms and Antilogarithms
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1
1
0
0
Fraction calculation
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1
1
0
0
Angle units conversion
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1
1
1
1
Trigonometric / Inverse-Tri. functions
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1
1
1
1
Hyperbolic / Inverse-Hyp. functions
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1
1
1
1
Sexagesimal ↔Decimal transformation
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1
1
2
2
Coordinates transformation
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1
1
2
2
Probability
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1
1
2
2
Other functions ( x–1, , , , x2, x3, xy)
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1
1
2
2
Standard Deviation Calculation
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1
1
3
3
Regression Calculation
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1
1
3
3

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General Guide
Turning on or off

To turn the calculator on, press [ ON/AC ] ; To turn the calculator off,
press [ OFF ].
Battery replacement

The calculator is powered by two alkaline batteries (G13 or LR44).
When the display dims, replace the batteries. Be careful not to be
injured when you replace the battery.
1. Unscrew the screws on the back of the calculator.
2. Insert a flat bladed screwdriver into the slot between the
upper and lower case then carefully twist it to separate the
case.
3. Remove both batteries and dispose of them properly. Never
allow children to play with batteries.
4. Wipe off the new batteries with a dry cloth to maintain good
contact.
5. Insert the two new batteries with their flat sides (plus termi-
nals) up.
6. Align the upper and lower cases then snap them to close
together.
7. Tighten the screws.
Auto power-off function

This calculator automatically turns it off when not operated for
approximately 9~15 minutes. It can be reactivated by pressing
[ ON/AC ] key and the display, memory, settings are retained.
Reset operation

If the calculator is on but you get unexpected results, press [ ON/AC ]
and then [ MODE ] four times to display the below menu. A message
appears on the display to confirm whether you want to reset the cal-
culator and clear memory contents after pressing [ 2 ].
To clear all variables, pending operations, statistical data, answers,
all previous entries, and memory, please press [ 2 ]. To abort the
reset operation without clearing the calculator, please press [ 1 ].
If the calculator is lock and further key operations becomes impos-
sible, please use a pointed object to press the reset hole to release
the condition. It will return all settings to default settings.

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Contrast adjustment

Pressing the [] or [] following [ MODE ] key can make the con-
trast of the screen lighter or darker. Holding either key down will
make the display become respectively lighter or darker.
Display readout

The display comprises the entry line, the result line, and indicators.
DEG 
74 – 8 / 7
72.85714286
Indicator
Entry line
Result line
Indicator
Entry line The calculator displays an entry of up to 79 digits.
Entries begin on the left ; those with more than 11 digits
scroll to the left.
Press [] or [] to move the cursor through an entry.
However, whenever you input the 73rd digit of any
calculation, the cursor changes from “ _ ” to “” to
let you know memory is running low. If you still need to
input more, you should divide your calculation into two
or more parts.
Result line It displays a result of up to 10 digits, as well as a deci-
mal, a negative sign, a “ x10 ” indicator, and a 2-digits
positive or negative exponent.
Indicators The following indicators appear on the display to indi-
cate you the current status of the calculator.
Indicator Meaning
MIndependent memory
–Result is negative
2nd 2nd set of function keys is active.
AAlphabetic Keys ( A~ F, M, X~ Y)
are active.
STORCL STO : Storing variable mode is active
RCL : Recalling variable mode is active
SD Statistics mode is active
REG Regression mode is active
DEGRAD Angle mode : DEGrees, GRADs, or RADs
ENG Engineering notation.
SCI Scientific notation.
FIX Number of decimal places displayed is fixed
HYP Hyperbolic-trig function will be calculated
BUSY While an operation is executing
There are digits to the left or right of
the display
There are earlier or later results that can be
displayed

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Before starting calculation
Mode Selection

Each time [ MODE ] is pressed, various functions menus and all
argument values corresponding to the desired mode is shown on
the screen. It includes three calculation modes (COMP, SD, REG),
three angle units (DEG, RAD, GRAD), four display notations (FIX,
SCI, NORM, ENG) and reset function (RESET).
Entering an argument value can set up this calculator to operate as
you want it to. Give “ SD ” as an example :
1. Press [ MODE ] once to display the calculation mode menu.
2. Enter [ 2 ] to let this calculator being operated under stan-
dard deviation mode.
COMP SD REG
1 2 3
SD DEG
_0.
Using “ 2nd ” keys

When you press [ 2nd ], the “ 2nd ” indicator shown in the display is
to tell you that you will be selecting the second function of the next
key you press. If you press [ 2nd ] by mistake, simply press [ 2nd ]
again to remove the “ 2nd ” indicator.
Cursor

Pressing [] or [] key can move the cursor to the left or the right.
Hold down any of those keys to move the cursor at high speed.
Pressing [ 2nd ] [] or [ 2nd ] [] can scroll the display up or down
while there are previous entries hidden the display. You can reuse
or edit a previous entry when it is on the entry line.
Making corrections during input

To delete a character at the cursor, make the character underlined
by using [] or [] to move the cursor, and then press [ DEL ] to
delete the character.
To replace a character, make the character underlined by using []
or [] to move the cursor, and then enter a new entry to replace the
character.
To insert a character, move the cursor to the position of the char-
acter where you want to insert, it will be inserted in the front of the
character after pressing [ 2nd ] [ INS ] and entering a new character.

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(Note) : The blinking cursor “ ” means the calculator is in insert
mode On the contrary, the blinking cursor is displayed as
“_” and it means the calculator is in overwrite mode.
To clear all characters, clear all input character by [ ON/AC ] key.
Replay function

• This function stores the latest operation executed. After execution
is completed, pressing [ 2nd ] [] or [ 2nd ] [] key will display the
operation from the beginning or the end. You can continue moving
the cursor by [] or [] to edit it. To delete a digit, press [ DEL ]. (
or, in overwrite mode, just type over the digit). See Example 1.
• The replay function can keep input digits up to 256 characters for
The calculator. After execution is completed or during entering,
you can press either [2nd ] [] or [2nd ] [] to display previous
input steps and edit values or commands for subsequent execu-
tion. See Example 2.
(Note) : The replay function isn’t cleared even when [ ON/AC ] is
pressed or power is turned off, so contents can be re
called even after [ ON/AC ] is pressed.
Error position display function

• When a mathematically illegal calculation is performed, error posi-
tion display function will tell you with the cursor where the error
is. Press [] or [] to move the cursor and then give it a correct
entry. You can also clear an error by pressing [ ON/AC ] and then
re-entered the values and expression from the beginning. See
Example 3.
Memory calculation

Independent memory
• Press [ M+ ] to add a result to running memory. Press [ 2nd ] [ M–
] to subtract the value from running memory. To recall the value
in running memory, press [ 2nd ] [ RCL ] [ M]. To clear running
memory, press [ 0 ] [ STO ] [ M ]. See Example 4.
(Note) : Besides pressing [ STO ] key to store a value, you can
also assign values to memory variable M by [ M+ ] or [ M– ].
Memory variable
• The calculator has nine memory variables for repeated use : A, B,
C, D, E, F, M,X, Y. You can store a real number in any of the nine

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memory variables. See Example 5.
* [ STO ] + A~F, M , or X ~ Y lets you store values to
variables.
* [ 2nd ] [ RCL ] or [ ALPHA ] + A ~ F , M , or X ~ Y
recalls the value of variable.
* [ 0 ] [ STO ] + A ~ F, M , or X ~ Y clears the content
to a specified memory variable.
* [ 2nd ] [ Mcl ] [ = ] clears all variables.
Stack

This calculator uses memory areas, called “ stacks “, to temporarily
store values (numeric stack) and commands (command stack ) ac-
cording to their precedence during calculations. The numeric stack
has 10 levels and command stack has 24 levels. A stack error (Stk
ERROR) occurs whenever you try to perform a calculation that is so
complex that the capacity of a stack is exceeded.
Order of operations

Each calculation is performed in the following order of precedence :
1) Coordinates transformation.
2) Type A functions which are required entering values before
pressing the function key, for example, x 2, , x !, x –1.
3) ,
4) Fractions.
5) Abbreviated multiplication format in front of variables, π.
6) Type B functions which are required pressing the function
key before entering, for example, sin, cos, tan, sin –1, cos –1,
tan –1, sinh, cosh, tanh, sinh –1, cosh –1, tanh –1, log, ln, 10 X ,
e X, , , ( – ).
7) Abbreviated multiplication format in front of Type B functions
, Alog2, etc.
8) nPr, nCr
9) x , ÷
10) +, –
• When functions with the same priority are used in series,
execution is performed from right to left.
e
X ln120→ e X { ln (120 ) }
otherwise, execution is from left to right.
• Compound functions are executed from right to left.
• Anything contained within parentheses receives the highest
priority.
Accuracy and Capacity

Output digits : Up to 10 digits.
Calculating digits : Up to 15 digits

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In general, every reasonable calculation is displayed up to 10 digits
mantissa, or 10-digits mantissa plus 2-digits exponent up to 10 ± 99.
Numbers used as input must be within the range of the given func-
tion as follow :
Functions Input range
sin x, tan x Deg：0≦| x | ≦4.499999999 x 10 10
Rad：0≦| x | ≦785398163.3
Grad：0≦| x | ≦4.499999999 x 10 10
however, for tan x
Deg：| x | ≠90 (2n–1)
Rad：| x | ≠(2n–1)
Grad：| x | ≠100 (2n–1) ( n is an integer)
cos x Deg：0≦ | x |≦4.500000008 x 10 10
Rad：0≦ | x |≦785398164.9
Grad：0≦| x | ≦5.000000009 x 10 10
sin -1 x, cos -1 x0
≦| x | ≦1
sinh x, cosh x 0≦| x | ≦230.2585092
tan -1 x 0≦| x | ≦9.999999999 x 10 99
tanh x, tanh -1 x 0≦| x | ≦9.999999999 x 10 – 1
sinh -1 x, cosh -1 x 0≦| x | ≦4.499999999 x 10 99
log x, ln x x ＞0
10 x– 9.999999999 x 10 99 ≦x ≦99.99999999
e x– 9.999999999 x 10 99 ≦x ≦230.2585092
x0≦x < 1 x 10 100
x 2 | x | <1 x 10 50
x –1 | x | <1 x 10 100, x≠0
3x| x | <1 x 10 100
x ! 0≦x≦69 , x is an integer.
Pol ( x, y ) | x |, | y | ≦9.999999999 x 10 49
x 2+ y 2≦9.999999999 x 10 99
Rec (r,θ) 0≦r ≦9.999999999 x 10 99
Deg：0≦| x | ≦4.499999999 x 10 10
Rad：0≦| x | ≦785398163.3
Grad：0≦| x | ≦4.499999999 x 10 10
however, for tan x
Deg：|θ| ≠90 (2n–1)
Rad：|θ| ≠(2n–1)
Grad：|θ| ≠100 (2n–1) (n is an integer)
| a | , b, c < 1 x 10 100, 0≦b, c

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| x | < 1 x 10 100
Sexagesimal ↔Decimal transformation
0 0 0 ≦| x | ≦999999 59 
xy x ＞0 :– 1 x 10 100 < y log x < 100
x = 0 :y > 0
x < 0 :y = n, 1/(2n+1), n is an integer.
but – 1 x 10 100 < y log | x | <100
xy
y＞0 : x≠0, –1 x 10 100 < x
1log y <100
y = 0：x ＞0
y < 0：x = 2n+1, I/n, n is an integer.(n≠0)
but – 1 x 10 100 < x
1log | y | <100
nPr, nCr 0≦n≦99, r≦n, n,r are integers.
SD
SD
(REG)
(REG)
| x |<1x1050,| y |<1x1050, | n |<1x10100
xσn, yσn,
x
x
_
,
y
y
_, A, B, r : n ≠0
xσn–1, yσn–1 : n ≠0,1
Error conditions

Error message will appear on the display and further calculation be-
comes impossible when any of the following conditions occur.
Ma ERROR (1) When result of function calculations exceeds
the range specified.
(2) You attempted to divide by 0.
(3) When your input values exceeds the allowable
input range of function calculations
Stk ERROR Capacity of the numeric stack or operator stack is
exceeded.
Syn ERROR You attempted to perform an illegal mathematical
operation.
To release the above errors, please press [ ON/AC ] key.
Basic Calculation
Use the COMP mode for basic calculations.
Arithmetic calculation

• For negative values, press [ (–) ] before entering the value; You
can enter a number in mantissa and exponent form by [ EXP ] key.
See Example 6.
• Arithmetic operations are performed by pressing the keys in the
same sequence as in the expression. See Example 7.

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Parentheses calculations

• Operation inside parentheses are always executed first. The cal-
culator can use up to 15 levels of consecutive parentheses in a
single calculation. See Example 8.
Percentage calculation

• [ 2nd ] [ % ] divides the number in the display by 100. You can use
this key sequence to calculate percentages, add-ons, discounts,
and percentages ratios. See Example 9~10.
Display formats

This calculator has the following four display notation mode for the
display value.
Norm Notation :
This calculator can display up to 10 digits. However, values that
exceed this limit are automatically displayed in exponential format.
There are two types of exponential display formats :
Norm 1 mode : 10 –2 > | x | , | x | ≧10 10
Norm 2 mode : 10 –9 > | x | , | x | ≧ 10 10
(Note) :All of the examples in this manual show calculation results
using the Norm 1 mode.
Engineering Notation : ( ENG )
Calculation result is displayed using engineering notation, where the
mantissa of the value is displayed with the number of decimal
places specified and the exponent is set to a multiple of 3 for display.
Fixed Notation : ( FIX )
Calculation result is displayed with the number of decimal places
specified.
Scientific Notation : ( SCI )
Calculation result is displayed using scientific notation, where the
mantissa of the value is displayed with the number of decimal places
specified.
• For FIX, SCI notation, the number of decimal places can be set
to any value between 0~9. After specifying the number of decimal
places, the display value will be rounded to the corresponding
number of digits and displayed. When no specification has been
made for the number of decimal places or significant digits, Norm
1 and Norm 2 mode can be carried. See Example 11.
• Pressing [ ENG ] or [ 2nd ] [ ] will cause the exponent dis-
play for the number being displayed to change in multiples of 3.
See Example 12.

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• Even if the number of decimal places is specified, internal calcu-
lation for a mantissa is performed up to 15 digits for The calcula-
tor, and the display value is stored in 10 digits. To round off those
values to the specified number of decimal places, press [ 2nd ] [
RND ]. See Example 13.
Continuous calculation function

• The calculator enables you to repeat the last operation executed
by pressing [ = ] key for further calculation. See Example 14.
• Even if calculations are concluded with the [ = ] key, the result ob-
tained can be used for further calculation. See Example 15.
Answer function

• Answer function stores the most recently calculated result. It is
retained even after the power is turned off. Once a numeric value
or numeric expression is entered and [ = ] is pressed, the result is
stored by this function. See Example 16.
(Note) : Even if execution of a calculation results in an error, how-
ever, Answer memory retains its current value.
Scientific Calculation
Use the COMP mode for scientific calculations.
Logarithms and Antilogarithms

• The calculator can calculate common and natural logarithms and
anti-logarithms using [ log ], [ ln ], [ 2nd ] [ 10 x], and [ 2nd ] [ e x].
See Example 17~19.
Fraction calculation

Fraction value display is as follow :
56 512 Display of 56
512 Display of
12
12
5
5
(Note) :Values are automatically displayed in decimal forma
whenever the total number of digits of a fractional values
(integer + numerator + denominator + separator marks)
exceeds 10.

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• To enter a mixed number, enter the integer part, press [ a b/c],
enter the numerator, press [ a b/c], and enter the denominator ; To
enter an improper fraction, enter the numerator, press [ a b/c], and
enter the denominator. See Example 20.
• By pressing [ 2nd ] [ d/c], the displayed value will be converted to
the improper fraction and vice versa. To convert between a deci-
mal and fractional result, press [ a b/c] .See Example 21.
• Calculations containing both fractions and decimals are calculated
in decimal format. See Example 22.
Angle units conversion

The angle units (DEG, RAD, GRAD) is set by pressing [ MODE ] to
display the angle menu. The relation among the three angle units
is:
180 ° = πrad = 200 grad
Angle conversions ( See Example 23.) :
1. Change the default angle settings to the units you
want to convert to.
2. Enter the value of the unit to convert.
3. Press [ DRG→] to display the menu.
The units you can select are D (degrees),
R(radians), G(Gradians).
4. Choose the units you are converting from.
5. Press [ = ].
Trigonometric / Inverse-Tri. functions

• The calculator provides standard trigonometric functions and
inverse trigonometric functions - sin, cos, tan, sin –1, cos –1 and
tan –1. See Example 24~26.
(Note) :When using those keys, make sure the calculator is set for
the angle unit you want.
Hyperbolic / Inverse-Hyp. functions

• The calculator uses [ 2nd ] [ HYP ] to calculate the hyperbolic
functions and inverse- hyperbolic functions - sinh, cosh, tanh, sinh
–1, cosh –1 and tanh –1. See Example 27~28.
(Note) :When using those keys, make sure the calculator is set for
the angle unit you want.

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Sexagesimal
↔Decimal transformation
Sexagesimal notation is as follow
12 59 45.6 Represent 12 Degree, 59 Minutes, 45.6 Seconds
• The calculator can preform the conversion between decimal and
sexagesimal numbers by [ ] and [ 2nd ] [ ]. See Example
29~30.
Coordinates transformation

Rectangular Coordinates Polar Coordinates
x + y i = r (cos θ+ i sin θ)
• The calculator can perform the conversion between rectangular co-
ordinates and polar coordinates by [ ALPHA ] [ Pol ( ] and [ ALPHA ]
[ Rec ( ]. Calculation results are automatically stored in memory
variables Eand F. See Example 31~32.
(Note) :When using those key, make sure the calculator is set for
the angle unit you want.
Probability

• This calculator provides the following probability functions : ( See
Example 33~36.)
[ nPr ] Calculates the number of possible permutations
of n item taken r at a time.
[ nCr ] Calculates the number of possible combinations
of n items taken r at a time.
[ x! ] Calculates the factorial of a specified positive
integer x , where x≦69.
[ RANDOM ] Generates a random number between 0.000 and
0.999
Other functions ( x
–1, , , , x2, x3, xy)
• The calculator also provides reciprocal ( [ x –1] ), square root ( [ ]
), cubic root ( [ ] ), universal root [ ], square ( [ x 2 ] ), cubic ( [
x 3 ] ) and exponentiation ( [ x y] ) functions. See Example 37~40.

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Standard Deviation Calculation
Use the SD mode for standard deviation calculations.
• Always make sure you clear statistical memory by [ 2nd ] [ Scl ]
before preforming standard deviation calculation.
• Individual data can be input using [ DT ] ; To delete data you just
input, please press [ 2nd ] [ CL ]. Multiple data of the same value
can be input using [ 2nd ] [ ；]. For example, to input the data 15
seven times, press 15 [ 2nd ] [ ；] 7 [ DT ].
• The values of the statistical variables depend on the data you in-
put. You can recall them by the key operations shown in the below
table. See Example 41.
[ RCL ] + [ A ] x
_[ 2nd ] + [ x _]
[ RCL ] + [ B ]
Xσn
[ 2nd ] + [
Xσn ]
n[ RCL ] + [ C ]
Xσn-1 [ 2nd ] + [ Xσn-1 ]
Regression Calculation
Use the REG mode for regression calculations.
Press [ MODE ] 3 to enter the REG menu and then choose one of
the six regression types by pressing the corresponding argument
value, as follow :
Lin Log Exp
1 2 3

Pwr Inv Quad
1 2 3
⎯⎯⎯←←][
⎯⎯→⎯
→][
Lin Linear Regression y = A + B x
Log Logarithmic Regression y = A + B lnx
Exp Exponential Regression y = A • e Bx
Pwr Power Regression y = A • x B
Inv Inverse Regression y = A +
Quad Quadratic Regression y = A + B x + C x 2
• Always make sure you clear statistical memory by [ 2nd ] [ Scl ]
before preforming regression calculation.
• Individual data can be input using [ DT ] ; To delete data you just
input, please press [ 2nd ] [ CL ]. Multiple data of the same value
can be input using [ 2nd ] [ ；]. For example, to input the data 40
and 55 ten times, press 40 [，] 55 [ 2nd ] [；] 10 [ DT ].

-E14-
• The values of the statistical variables depend on the data you in-
put. You can recall them by the key operations shown in the below
table. To predict a value for x (or y) given a value for y (or x), enter
the given value, press [ 2nd ] [ y
^] (or [ 2nd ] [ x ^] ), and press [ = ]
again. See Example 42~43.
Σx 2[ RCL ] + [ A ] X
σn
[ 2nd ] + [ xσn]
Σx [ RCL ] + [ B ] x
σn-1
[ 2nd ] + [
x
σn-1 ]
n [ RCL ] + [ C ] y
_
[ 2nd ] + [ y
_]
Σy 2[ RCL ] + [ D ] y
σn
[ 2nd ] + [ yσn]
Σy [ RCL ] + [ E ] y
σn-1
[ 2nd ] + [ yσn-1 ]
Σxy [ RCL ] + [ F ] A [ 2nd ] + [ A ]
Σx 3[ RCL ] + [ M ] B [ 2nd ] + [ B ]
Σx 2y [ RCL ] + [ X ] C [ 2nd ] + [ C ]
Σx 4[ RCL ] + [ Y ] r [ 2nd ] + [ r ]
x
_
[ 2nd ] + [ x
^] x
^ [ 2nd ] + [ x
^]
y
^ [ 2nd ] + [ y
^]
(Note) : Variable Σx 4, Σx 2y are only available in Quadratic
regression.

-S1-
CONTENIDOS
Guía General ................................................................................... 2
Encendiendo o apagando ............................................................ 2
Reemplazo de batería.................................................................. 2
Función auto desactivadora ......................................................... 2
Operación Restablecer ................................................................ 2
Ajuste del contraste...................................................................... 3
Lectura de la visualización ........................................................... 3
Antes de empezar los cálculos ..................................................... 4
Selección de Modo....................................................................... 4
Usando teclas “ 2nd ” ................................................................... 4
Cursor........................................................................................... 4
Haciendo correcciones durante la entrada .................................. 5
Función de respuesta................................................................... 5
Función de visualización de la posición de error ......................... 5
Función de memoria..................................................................... 6
Pila ............................................................................................... 6
Orden de operaciones.................................................................. 6
Exactitud y Capacidad ................................................................. 7
Condiciones de error.................................................................... 8
Cálculo Básico................................................................................ 9
Cálculo aritmético......................................................................... 9
Cálculos de paréntesis................................................................. 9
Cálculo de porcentaje .................................................................. 9
Formatos de visualización............................................................ 9
Función del cálculo continuo...................................................... 10
Función de respuesta................................................................. 10
Cálculo Científica ..........................................................................11
Logaritmos y Antilogaritmos ........................................................11
Cálculo de fracción....................................................................11
Conversión de unidades de ángulo.............................................11
Funciones trigonométricas / Tri. Inversas .................................. 12
Funciones Hiperbólicas / Hip. Inversas...................................... 12
Sexagesimal ↔Transformación Decimal .................................. 12
Transformación de las coordenadas.......................................... 12
Probabilidad ............................................................................... 13
Otras funciones ( x–1, , , , x2, x3, xy)............................... 13
Cálculo de Derivación Standard ................................................. 13
Cálculo de Regresión................................................................... 13

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Guía General
Encendiendo o apagando

Para encender la calculadora, presionar [ ON/AC ] ; para apagar la
calculadora, presionar [ OFF ].
Reemplazo de batería

La calculadora es alimentada por duas baterías alcalinas G13(LR44).
Cuando la visualización se torna borrosa, sustituya las baterías.
Tenga cuidado al reemplazar la batería para no ser herido.
1. Soltar los tornillos en la parte trasera de la calculadora.
2. Inserir un destornillador en la ranura entre la caja superior y
inferior y torcerla cuidadosamente para separarlas.
3. Quitar ambas las baterías y descartarlas. No permíta nunca
que los niños toquen las baterías.
4. Limpiar las baterías nuevas con un paño seco para mantener
un bueno contacto.
5. Insertar las dos baterías nuevas con las faces llanas (termi-
nales positivos) hasta arriba.
6. Alinear las cajas superiores y inferiores y aprietarlas para
cerrarlas juntamente.
7. Atornillar los tornillos.
Función auto desactivadora

Esta calculadora se apaga automáticamente cuando no operada
por aproximadamente 9~15 minutos.Puede reactivarse presionando
la tecla [ ON/AC ] y la visualización, memoria y configuración son
conservadas.
Operación Restablecer

Si la calculadora está encendida pero usted consigue resultados
inesperados, apriete [ ON/AC ] y después [ MODE ] cuatro veces
para desplegar el menú abajo. Un mensaje aparece en el des-
pliegue para confirmar si usted quiere restablecer la calculadora y
apagar los contenidos de memoria después de apretar [ 2 ].
Para apagar todas las variables, programas, operaciones pendi-
entes, datos estadísticos, respuestas, todas las entradas anteriores,
y memoria, por favor apriete [ 2 ]. Para abortar la operación restab-
lecida sin apagar la calculadora, por favor apriete [ 1 ].
Si la calculadora está bloqueada y el accionamiento de cualquier
tecla se vuelve imposible, por favor use un objeto con punta para
presionar en el hueco el botón de restaurado y al mismo tiempo
solucionar el problema. Esto retornará todas las configuraciones a
aquellas por defecto.

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Ajuste del contraste

Presionando la tecla [] o [] seguida de [ MODE ] puede hacer
el contraste de la pantalla más clara o más oscura. Dominando
cualquier tecla abajo hará la visualización volverse respectivamente
más clara o más oscura.
Lectura de la visualización

La visualización comprende la línea de entrada, la línea del resul-
tado, e indicadores.
DEG 
74 – 8 / 7
72.85714286
Indicador
Línea de la entrada
Línea del resultado
Indicador
Línea de entrada La calculadora muestra una entrada de hasta
79 dígitos. Las entradas empiezan en la izqui
erda; aquéllas con más de 11dígitos desplazan
para la izquierda. Presionar [] o []
para mover el cursor a través de una entrada.
Sin embargo, siempre que usted entrar el
73° dígito de cualquier cálculo, el cur sor
cambia de “ _ ” a “ ” para permitirle saber
que la memoria está funcionando gastada
mente. Si usted todavía necesita entrar más,
usted debe dividir su cálculo en dos o más
partes.
Línea de resultado Muestra un resultado de hasta 10 dígitos,
así como un decimal, una señal negativa, un
indicador “ x10 ” y un exponente positivo o
negativo de 2 dígitos.
Indicadores Los indicadores siguientes aparecen en la
visualización para Indicarte el estado ac tual
de la calculadora.
Indicador Significado
MMemoria independiente
–Resultado es negativo
2nd 2° juego de teclas de función está activo
ALlaves Alfabéticas ( A ~ F , M , X ~ Y )
están activas.
STORCL STO : Modo de almacenamiento devariable
está activo
RCL : Modo revocador de variable está
activo
SD Modo de estadística está activo
REG Modo de regresión está activo
DEGRAD Modo de ángulo : DEGrees,GRADs,oRADs

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ENG Notación para Ingeniería (ENGineering)
SCI Notación para Científica (SCIentific)
FIX Número de posiciones decimales mostrado
está fijo
HYP Función hiperbólica-trig. será calculada
BUSY Mientras una operación está ejecutando
Hay dígitos a la izquierda o derecha de la
visualización
Hay resultados anteriores o posteriores que
pueden ser mostrados
Antes de empezar los cálculos
Selección de Modo

Cada vez que se aprieta [ MODE ], varios menús de funciones y
todos los valores de argumento correspondiendo al modo deseado
se muestra en la pantalla. Incluye tres modos de cálculo (COMP,
SD, REG), tres unidades de ángulo (DEG, RAD, GRAD), cuatro
notaciones del despliegue (FIX, SCI, NORM, ENG) y función
restablecer (RESET).
Entrando un valor de argumento puede ajustar esta calculadora
para operar como usted lo quiere. Déle “ SD ” como un ejemplo :
como un ejemplo :
1. Apretar [ MODE ] una vez para desplegar el menú del modo
de cálculo.
2. Entre [ 2 ] para permitir esta calculadora de operar bajo el
modo de derivación normal.
COMP SD REG
1 2 3
SD DEG
_0.
Usando teclas “ 2nd ”

Cuando usted presiona [ 2nd ], el indicador “ 2nd ” mostrado en
la visualización es para decirle que usted estará seleccionando la
segunda función de la próxima tecla que usted presiona. Si usted
presionar [ 2nd ] por equivocación, simplemente presionar [ 2nd ] de
nuevo para quitar el indicador “ 2nd ” .
Cursor

Presionando la tecla [] o [] puede mover el cursor a la izqui-
erda o la derecha. Sujete cualquiera de esas teclas para abajo para
mover el cursor a alta velocidad.
Presionando [ 2nd ] [] o [ 2nd ] [] puede desplazar la visual-
ización arriba y abajo mientras hay entradas anteriores escondidas

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en la visualización. Usted puede reusar o editar una entrada ante-
rior cuando está en la línea de entrada.
Haciendo correcciones durante la entrada

Para anular un carácter con el cursor, vaya al carácter subrayado
usando [] o [] para mover el cursor, y luego presionar [ DEL ]
para anular el carácter.
Para reemplazar un carácter, vaya al carácter subrayado usando []
o [] para mover el cursor, y luego entrar una nueva entrada para
reemplazar el carácter.
Para insertar un carácter, mueva el cursor a la posición del carácter
donde usted quiere insertar. Él se Insertará en frente del carácter
después de presionar [ 2nd ] [ INS ] y entrando un nuevo carácter.
(Nota) : El cursor intermitente “ ” significa que la calculadora
está en el modo de inserción. Al contrario, el cursor in
termitente es mostrado como “_” y él significa que la
calculadora está en el modo sobrescribir.
Para borrar todos los carácteres, borra todas las entradas de
carácter con la tecla [ ON/AC ] .
Función de respuesta

• Esta función almacena la última operación ejecutada. Después
que la ejecución está completa, presiona la tecla [ 2nd ] [] o
[ 2nd ] [] mostrará la operación desde el principio al fin. Usted
puede continuar moviendo el cursor a través del [] o [] para
editarlo. Para anular un dígito, presionar [ DEL ]. ( o, en modo
sobrescribir, simplemente teclee encima del dígito ).
Vea Ejemplo 1.
• La función de repetición puede mantener los dígitos de la
entrada hasta 256 carácteres para La calculadora. Después que
la ejecución está completa o durante la entrada, usted puede
presionar cualquiera [] [] para mostrar los pasos anteriores
de entrada y editar valores o comandos para la ejecución
subsecuente. Vea Ejemplo 2.
(Nota) : La función de repetición no está borrada incluso cuando
[
ON/AC ] es presionado o corriente está apagada, por
eso los contenidos pueden ser revocados después de
presionar [
ON/AC ].
Función de visualización de la posición de error

• Cuando un cálculo matemáticamente ilegal es ejecutado, la
función de visualización de la posición de error le indicará con
el cursor donde el error está. Presionar [] o [] para mover el
cursor y luego para darle una entrada correcta. Usted también
puede borrar un error presionando [ ON/AC ] y luego re-entrando