Citizen SR-270II, SR-275 User Manual

SR270ll / SR-275
Scientific Calculator
GENERAL GUIDE ............................................................................	2
TURNING ON OR OFF ........................................................................	2
BATTERY REPLACEMENT ..................................................................	2
AUTO POWER-OFF FUNCTION ...........................................................	2
RESET OPERATION...........................................................................	2
CONTRAST ADJUSTMENT ..................................................................	3
DISPLAY READOUT ...........................................................................	3
BEFORE STARTING CALCULATION .............................................	4
MODE SELECTION............................................................................	4
USING “2ND" KEYS...........................................................................	4
CURSOR .........................................................................................	4
MAKING CORRECTIONS DURING INPUT ...............................................	4
REPLAY FUNCTION ...........................................................................	5
ERROR POSITION DISPLAY FUNCTION.................................................	5
MEMORY CALCULATION ....................................................................	5
STACK ............................................................................................	6
ORDER OF OPERATIONS ...................................................................	6
ACCURACY AND CAPACITY ...............................................................	6
ERROR CONDITIONS.........................................................................	8
BASIC CALCULATION ....................................................................	8
ARITHMETIC CALCULATION................................................................	9
PARENTHESES CALCULATIONS ..........................................................	9
PERCENTAGE CALCULATION .............................................................	9
DISPLAY FORMATS ...........................................................................	9
CONTINUOUS CALCULATION FUNCTION ............................................	10
ANSWER FUNCTION........................................................................	10
SCIENTIFIC CALCULATION..........................................................	10
LOGARITHMS AND ANTILOGARITHMS................................................	10
FRACTION CALCULATION ................................................................	10
ANGLE UNITS CONVERSION.............................................................	11
TRIGONOMETRIC / INVERSE-TRI. FUNCTIONS ...................................	11
HYPERBOLIC / INVERSE-HYP. FUNCTIONS........................................	11
SEXAGESIMAL DECIMAL TRANSFORMATION .....................................	11
COORDINATES TRANSFORMATION ...................................................	12
PROBABILITY .................................................................................	12
OTHER FUNCTIONS ( X–1, , 3 , y , X2, X3, XY ) ........................	12
STANDARD DEVIATION CALCULATION .....................................	12
REGRESSION CALCULATION......................................................	13

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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

SR-270ll is powered by two alkaline batteries (GP76A).

If the display becomes dim and difficult to read, the batteries should be replaced as soon as possible.

To replace batteries :

1)Remove the screws and the back cover.

2)Replace the old batteries and install new ones with polarity in correct directions, then secure the screws in place and press [ ON/AC ] to turn the power on.

SR-275 is powered two AA-size ( UM-3 ) batteries. If the display becomes dim and difficult to read, the batteries should be replaced as soon as possible.

To replace batteries :

1)Slide the battery compartment cover in the direction indicated by the arrow and remove it.

2)Remove the old batteries and install new ones with polarity in correct directions, then replace the battery compartment cover and press [ ON/AC ].

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 calculator and clear memory contents after pressing [ 2 ].

ENG	RESET	[2]	RESET : N	Y
1	2	→	1	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 impossible, please press [ 0 ] [ ON/AC ] at the same time to release the condition. It will return all settings to default settings.

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Contrast adjustment

Pressing the [Ÿ] or [ź] following [ MODE ] key can make the contrast 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.

Indikator					DEG Ç				Indikator
Indtastningslinje				74−8 ÷ 7						Resultatlinje
			66.

Entry line SR-270ll / SR-275 displays an entry of up to 79 digits.

Entries begin on the left ; those with more than 11 digits scroll to the left. Press [Ź] or [Ż] to move the cursor through an entry. However, whenever you input the 73rd digit of any calculation, the cursor changes from “_” to “Ŷ” 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-digits positive or negative exponent.

Indicators The following indicators appear on the display to indicate you the current status of the calculator.

Indicator Meaning

M Independent memory

ņResult is negative

2nd	2nd set of function keys is active.
.A.	Alphabetic 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

Í Î There are digits to the left or right of the display

ÏÐ 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 standard deviation mode.

COMP SD REG			[2]	SD
1	2	3	→	0.

Using “2nd" keys

To execute the functions marked in yellow, please press [ 2nd ] and then the corresponding key. 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 [Ź] or [Ż] 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 ] [Ÿ] or [ 2nd ] [ź] 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 [Ź] or [Ż] to move the cursor, and then press [ DEL ] to delete the character.

To replace a character, make the character underlined by using [Ź] or [Ż] 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 character where you want to insert, it will be inserted in the front of the character after pressing [ 2nd ] [ INS ] and entering a new character.

(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.

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Replay function

•This function stores the latest operation executed. After execution is completed, pressing [ 2nd ] [Ÿ] or [ 2nd ] [ź] key will display the operation from the beginning or the end. You can continue moving the cursor by [Ź] or [Ż] 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 SR-270ll / SR-275. After execution is completed or during entering, you can press either [2nd ] [Ÿ] or [ 2nd ] [ź] to display previous input steps and edit values or commands for subsequent execution. 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

recalled even after [ ON/AC ] is pressed.

Error position display function

• When a mathematically illegal calculation is performed, error position display function will tell you with the cursor where the error is. Press [Ź] or [Ż] to move the cursor and then give it a correct en-

try. You can also clear an error by pressing [ ON/AC ] and then reentered 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 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.

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