CITIZEN SR-270X User Manual
General Guide .................................................3
Before Starting Calculation ............................4
Basic Calculations ........................................ 10
Scientific Function Calculations .................. 11
Turning on or off.............................................3
Battery replacement .......................................3
Auto power-off function .................................3
Reset operation ..............................................3
Contrast adjustment....................................... 3
Display readout ..............................................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
Arithmetic calculation .................................. 10
Parentheses calculations............................. 10
Percentage calculation................................. 11
Display notations.......................................... 11
Answer Function .......................................... 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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Statistical Calculations .................................14
Function Table...............................................17
Probability ....................................................13
Other functions ( √, 3, X, x-1, x2,
x3, xy , Abs, RND ) .........................................14
Multi-statement Function .............................14
To Enter data for statistical analysis............15
To analyze data you have entered ................ 15
To view or change data ................................ 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 ].
Clear?
1: Se tup 2:M em ory
3: A ll
[ 3 ]
Re set A ll?
[ = ] : Yes
[AC ] : C ancel
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
Math
Entry line
12369x7532x1032
c
9. 3163308
SR-270X displays an entry of up to 99 digits. Entries
Entry line
Result line
Indicators
Indicator Meaning
2nd 2nd set of function keys are active
A Alphabetic 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
D R G Angle 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
Disp Displayed value is intermediate result when performing
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.
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.
The following indicators may appear on the display to
indicate the current status of the calculator.
There are earlier or later results that can be displayed
multi-statement function
Ind icat or
39
x10
Result l ine
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
STAT : Use this mode to perform single–variable and
TABLE : Use this mode to display a defined function in a tabular
scientific calculations. (the default)
paired–variable statistical calculations and regression
calculations.
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 ].
T
1: MthIO 2: LineIO
3: De g 4: Ra d
5: Gra 6: Fix
7: Sc i 8 : Norm
MthIO : Math mode displays inputs and outputs in textbook
LineIO : Linear mode displays inputs and outputs in a single
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
ab/c : ab/c displays the fraction in mixed number format
d/c : d/c displays the fraction in improper format (the
STAT : STAT sets the Statistical Data Editor Screen to show
Disp : Disp sets the decimal point to Dot ( . ) or Comma ( , )
(Dot is the default)
W
format. (the default)
line.
the results are to be displayed in exponential format
or in non-exponential format (Norm1 is the default)
default)
or hide the FREQ column
CONTX : Contrast Adjustment
Using Math Mode
d
c
1: ab/c 2: d/c
STAT
3:
CONT
5:
_
Press [ 2nd ] [ SET UP ] [ 1 ] to enter Math mode. While in math
mode, the values for functions such as
e X, √, 3,
in a mathematically written way. By default, SR-270X is in Math
2
3
1−
,
X
y
,
,
X
,x....can be entered and displayed
X
X
4: Disp
`
d
, A
e
c
b
, log a b, Abs, 10x,
c
mode. See Example 1~2.
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Using " 2nd " " ALPHA " Keys
To execute the functions marked in yellow, please press [ 2nd ] and
then the corresponding key. 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.
To execute the functions marked in green, please press [ ALPHA ]
and then the corresponding key. 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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File name : HDB0R100704_English_text_071113
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