Citizen SR-270II manual General Guide, Before starting calculation

SR-270II

Scientific Calculator

General Guide

￿Turning on or off

To turn the calculator on, press [ ON/AC ] ; To turn the calculator off, press [ OFF ].

￿Battery replacement

SR-270IIis 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.

￿Auto power-off function

This calculator automatically turns it off when not operated for approxi- mately 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 op- eration 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.

￿Contrast adjustment

Pressing the [￿] or [￿] following [ MODE ] key can make the contrast of the screen lighter or darker. Holding either key down will make the dis- play become respectively lighter or darker.

￿Display readout

The display comprises the entry line, the result line, and indicators.

Indicator		DEG	￿	Indicator
Entry line	74 – 8 ÷ 7
			66.		Result line

Entry line SR-270IIdisplays 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. How- ever, 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 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

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

Before starting calculation

￿Mode Selection

1