Citizen SR-270X User manual

File name: HDB0R100721_Cover_ok.doc version : 2010/07/12
SIZE:140x74mm
PARTS NO. HDB0R100721 (SR100)
Scientific Calculator
SR-270X
Instruction Manual
Manual de Instrucciones
Livro de Especificacoes
A
nweisungshandbuch
Manuel d’instructions
Istruzioni all’Uso
Gebruiksaanwijzing

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General Guide .................................................3
Turning on or off.............................................3
Battery replacement .......................................3
Auto power-off function .................................3
Reset operation ..............................................3
Contrast adjustment.......................................3
Display readout ..............................................4
Before Starting Calculation ............................4
Using " MODE " keys......................................4
Using " SET UP " keys....................................5
Using Math Mode............................................5
Using " 2nd " " ALPHA " Keys........................6
Making corrections during Input....................6
Error Position Display Function.....................6
Replay function ..............................................6
Memory calculation ........................................7
Order of operations ........................................7
Accuracy and Capacity...................................8
Error conditions .............................................9
Basic Calculations........................................10
Arithmetic calculation ..................................10
Parentheses calculations.............................10
Percentage calculation................................. 11
Display notations.......................................... 11
Answer Function .......................................... 11
Scientific Function Calculations .................. 11
Logarithmic and Exponential functions.......12
Fraction calculation......................................12
Angle unit conversions ................................12
Sexagesimal ↔Decimal transformation......13
Trigonometric / Inverse-Tri. functions..........13
Hyperbolic / Inverse-Hyp. functions.............13
Coordinates transformation .........................13

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Probability ....................................................13
Other functions ( √, 3, X, x-1,x2,
x3, xy, Abs, RND ) .........................................14
Multi-statement Function .............................14
Statistical Calculations .................................14
To Enter data for statistical analysis............15
To analyze data you have entered................15
To view or change data ................................17
Function Table...............................................17

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General Guide
Turning on or off
To turn the calculator on, press [ ON ]; To turn the calculator off,
press [ 2nd ] [ OFF ].
Battery replacement
SR-270X is a dual power system which is powered by one
button-type battery (G13 or L1154) and a solar cell. If the display
becomes dim and difficult to read, the batteries should be replaced
as soon as possible.
To replace batteries:
1) Remove the screw and the battery compartment cover.
2) Remove the old battery and insert a new one with polarity in
correct directions, then replace the cover.
3) After changing battery, please use a pointed object to press the
reset hole in the rating label area located at the rear of this unit.
Auto power-off function
This calculator automatically turns off when not operated for
approximately 3~9 minutes. It can be reactivated by pressing [ ON ]
key and the memory, settings are retained.
Reset operation
If the calculator is on but you get unexpected results, press [ 2nd ]
[ CLR ] in sequence. A message appears on the display to confirm
whether you want to reset the calculator and clear memory contents
after selecting [ 3 ].
[ 3 ]
Reset All?
[ = ] : Yes
[AC] : Cancel
Clear?
1: Setup 2:Memory
3: All
To clear all variables, pending operations, statistical data, answers,
all previous entries, and memory, please press [ = ]; To cancel the
reset operation without clearing the calculator, please press [ AC ].
If the calculator is lock and further key operations becomes
impossible, please use a pointed object to press the reset hole at the
same time to release the condition. It will return all settings to default
settings.
Contrast adjustment
Pressing the [ W] or [ X] following [ 2nd ] [ SET UP ] [ T] [ 5 ]
(WCONTX) keys in sequence can make the contrast of the screen
lighter or darker. Holding either key down will make the display
become respectively lighter or darker. After finishing your setting,
press [ AC ] to exit.

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Display readout
The display comprises the entry line, the result line, and indicators.
D
12369x7532x1032
9.3163308x1039
Entry line
Indicator
Result line
Math c
Entry line SR-270X displays an entry of up to 99 digits. Entries
begin on the left; those with more than 15 digits scroll
to the left. Press [ X] and [ W] to move the cursor
through an entry. However, whenever you input the
89th 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
decimal, a negative sign, a " x10 " indicator, and a
2-digit positive or negative exponent.
Indicators The following indicators may appear on the display to
indicate the current status of the calculator.
Indicator Meaning
2nd 2nd set of function keys are active
AAlphabetic keys are active
M There is a number in the memory
STO Storing variable mode is active
RCL Recalling variable mode is active
STAT Statistics mode is active
Math Math style is selected as the Input/output format
DRGAngle mode: Degrees, Radians, or Gradians
FIX A fixed number of decimal places is in effect
SCI A fixed number of Scientific notation is in effect
TS There are earlier or later results that can be displayed
Disp Displayed value is intermediate result when performing
multi-statement function
Before Starting Calculation
Using " MODE " keys
Press [ MODE ] to display mode menus when specifying an
operating mode ( " 1: COMP ", " 2: STAT ", " 3: TABLE " ).
COMP : Use this mode for basic calculations, including
scientific calculations. (the default)
STAT : Use this mode to perform single–variable and
paired–variable statistical calculations and regression
calculations.
TABLE : Use this mode to display a defined function in a tabular
form.

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Give " 2: STAT " as an example:
Method : Press [ MODE ] and then key in directly the number of
the mode, [ 2 ] , to enter the desired mode
immediately.
Using " SET UP " keys
[ 2nd ] [ SET UP ] display the setup menu that enables you to specify
the input /output format, the angle mode, the numeric notation, the
statistical setting or the contrast adjustment. The setup menu consist
of two screens which you can jump between by using [ T] and [ S].
d
c
1: ab/c 2: d/c
3: STAT 4: Disp
5: _CONT `
c
1: MthIO 2: LineIO
3: Deg 4: Rad
5: Gra 6: Fix
7: Sci 8: Norm
T
MthIO : Math mode displays inputs and outputs in textbook
format. (the default)
LineIO : Linear mode displays inputs and outputs in a single
line.
Deg : Deg mode sets the angle unit to degrees (the default)
Rad : Rad mode sets the angle unit to radians
Gra : Gra mode sets the angle unit to gradians.
Fix : Fix decimal setting (0 through 9)
Sci : Scientific notation (0 through 9)
Norm : Norm specifies the range (Norm1, Norm2) in which
the results are to be displayed in exponential format
or in non-exponential format (Norm1 is the default)
ab/c : ab/c displays the fraction in mixed number format
d/c : d/c displays the fraction in improper format (the
default)
STAT : STAT sets the Statistical Data Editor Screen to show
or hide the FREQ column
Disp : Disp sets the decimal point to Dot ( . ) or Comma ( , )
(Dot is the default)
WCONTX: Contrast Adjustment
Using Math Mode
Press [ 2nd ] [ SET UP ] [ 1 ] to enter Math mode. While in math
mode, the values for functions such as e
d, A c b, log a b, Abs, 10x,
e X, √, 3,X2,X3,X1−,Xy,x....can be entered and displayed
in a mathematically written way. By default, SR-270X is in Math
mode. See Example 1~2.

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Using " 2nd " " ALPHA " Keys
When you press [ 2nd ], the " 2nd " indicator shown on the display
indicates 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.
When you press [ ALPHA ], the "A" indicator shown on the display
indicates that you will be selecting the alphabetic function of the next
key you press. If you press [ ALPHA ] by mistake, simply press
[ ALPHA ] again to remove the " A" indicator.
Making corrections during Input
The vertical blinking cursor " " means the calculator is in insert
mode. The horizontal blinking cursor " " means the calculator is in
overwrite mode.
By default, the calculator is in insert mode. In linear format, you can
press [ 2nd ] [ INS ] to switch between the two modes, whereas in
Math format, you can use only the insert mode.
In insert mode, the character in front of the cursor " " will be deleted
or inserted after you press [ DEL ] or enter a new character
In overwrite mode, the character at the cursor " " will be deleted by
[ DEL ] key or replaced by any new character you enter.
To clear all characters, simply press [ AC ] in either mode.
Error Position Display Function
When a mathematically illegal calculation performed causes an error
and an error message ( See < Error conditions > ) appears, press
[ W] [ X] and then the error position display function will tell you with
the cursor where the error is. In that case, please make necessary
corrections before executing the calculation again. See Example 3.
Replay function
This function stores operations that just have been executed in
COMP mode. After execution is completed, pressing [ T] or [ S]
key will display the operation executed.
You can continue moving the cursor by [ W] or [ X] to display
previous input steps and editing values or commands for
subsequent execution.
The operation records in Memory are cleared each time when you
turn off the calculator, press [ ON ] key, perform a “reset”, change
display format or calculation mode.
When the memory is full, the oldest calculation records are deleted
automatically to make room for the new ones. See Example 4.

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Memory calculation
Memory variable
The calculator has seven memory variables for repeated use -- A, B,
C, D, M, X, Y. You can store a real number in any of the seven
memory variables. See Example 5.
• [ 2nd ] [ STO ] + [ A ] ~ [ D ], [ M ], [ X ] ~ [ Y ] lets you store values
to variables.
• [ RCL ] + [ A ] ~ [ D ], [ M ], [ X ] ~ [ Y ] recalls the value of the
variable.
• [ 0 ] [ 2nd ] [ STO ] + [ A ] ~ [ D ], [ M ], [ X ] ~ [ Y ] clears the
content to a specified memory variable.
• [ ALPHA ] + " memory variable " lets you insert the applicable
variables in a calculation.
• [ 2nd ] [ CLR ] [ 2 ] [ = ] clears all variables.
Running memory
You should keep the following rules in mind when using running
memory. See Example 6.
• Press [ M+ ] to add a result to running memory and the " M "
indicator appears when a number is stored in the memory. Press
[ RCL ] [ M ] to recall the content of running memory.
• Recalling from running memory by pressing [ RCL ] [ M ] key does
not affect its contents .
• Running memory is not available when you are in statistics mode.
• The memory variable M and running memory utilize the same
memory area.
• In order to replace the content of the memory with the displayed
number, please press [ 2nd ] [ STO ] [ M ] key.
• To clear the content of running memory, you can press [ 0 ] [ 2nd ]
[ STO ] [ M ] in sequence.
(Note) : Besides pressing [ 2nd ] [ STO ] [ M ] key to store a value,
you can also assign values to memory variable M by
[ M+ ]. However, when [ 2nd ] [ STO ] [ M ] is used,
previous memory contents stored in variable M are
cleared and replaced with the newly assigned value.
When [ M+ ] is used, values is added to present sum in
memory.
Order of operations
Each calculation is performed from left to right and in the following
order of precedence:
1) Expression inside parentheses.
2) Functions with parentheses:
PR, R P
sin, cos, tan, sin –1, cos –1, tan –1, sinh, cosh, tanh, sinh –1,
cosh –1, tanh –1,
log, ln,
√, 3, 10 X, e X, Abs, RND

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3) Functions preceded by values, powers, power roots, for
example, x 2, x 3, x–1, x!, DMS, ° , r , g , x y, X, %
4) Fractions
5) Negations ( – )
6) Statistical estimated value calculation: x
ˆ,y
ˆ,1x
ˆ,2x ˆ
7) nPr, nCr
8) x ,
Multiplication sign omitted immediately before π, e, variable, and
function with parentheses: for example, 3π, 5B, Asin(30)
9) +, –
Accuracy and Capacity
Output digits : Up to 10 digits.
Calculating digits : Up to 16 digits
In general, every reasonable calculation is displayed up to 10 digits
mantissa, or 10-digit mantissa plus 2-digit exponent up to 10 ± 99.
Numbers used as input must be within the range of the given
function as follows:
Functions Input range
sin x
cos x
Deg : 0 ≦x <9 x 10 9
Rad : 0 ≦x <157079632.7
Grad : 0 ≦x <1 x 10 10
tan x Same as sin x, except when
Deg : x = 90 (2n-1)
Rad : x = 2
π(2n-1)
Grad : x = 100 (2n-1)
sin –1 x,
cos –1 x 0 ≦x ≦1
tan –1 x 0 ≦x <1 x 10 100
sinh x, cosh x 0 ≦x ≦230.2585092
tanh x 0 ≦x <1 x 10 100
sinh –1 x 0 ≦x <5 x 10 99
cosh –1 x 1 ≦x <5 x 10 99
tanh –1 x 0 ≦x <1
log x, ln x 0 <x <1 x 10 100
10 x–1 x 10 100 ＜x ＜100
e x–1 x 10 100 ＜x ≦230.2585092
x0 ≦x <1 x 10 100
x 2x <1 x 10 50

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x 3x ≦2.15443469003 x 10 33
x -1 x ＜1 x 10 100, x≠0
3xx <1 x 10 100
X ! 0 ≦x ≦69 ( x is an integer)
nPr 0≦r≦n, 0≦n<1 x 10 10 (n,r are integers)
1≦{n!/(n-r)!}<1 x 10 100
nCr 0≦r≦n, 0≦n<1 x 10 10 (n,r are integers)
1≦n!/r!<1 x 10 100 or 1≦{n!/(n-r)!}<1 x 10 100
RP x , y ＜1 x 10 100
22 y+x ＜1 x 10 100
PR 0 ≦r ＜1 x 10 100
θ: same as sin x
DMS │D│, M, S ＜1 x 10 100, 0 ≦M, S
eDMS x <1 x 10 100
Decimal QSexagesimal Conversions
0 0 ׀0 ׀׀≦x ≦9999999
59 ׀59 ׀׀
x yx >0 : –1 x 10 100 <y log x <100
x = 0 : y >0
x <0 : y = n, m/(2n+1) (m, n are integers)
but –1 x 10 100 <y log ⏐x⏐<100
xyy >0 : x ≠0, –1 x 10 100 <x
1 log y <100
y = 0 : x >0
y <0 : x = 2n+1, (2n+1)/m (m≠0, m, n are
integers)
but –1 x 10 100 <x
1 log ⏐y⏐<100
Ab/c Total of integer, numerator and denominator
must be within 10 digits (includes division
marks)
STAT 1–VAR :
a. n ≦80 lines (when FREQ column is OFF)
b. n ≦40 lines (when FREQ column is ON)
2–VAR :
a. n ≦40 lines (when FREQ column is OFF)
b. n ≦26 lines (when FREQ column is ON)
Error conditions
Error message will appear on the display and further calculation
becomes impossible when any of the following conditions occur.
Indicator Meanings
Math ERROR (1) You attempted to divide by 0
(2) When allowable input range of function
calculations exceeds the range specified