Citizen SR-270II User Manual

1
General Guide
 Turning on or off
To turn the calculator on, press [
ON
/
AC
] ; To turn the calculator off, press
[ OFF ].
 Battery replacement
SR-270II 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.
 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 ].
2 1
RESET ENG
→
] 2 [
2 1
YN : RESET
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.
SR-270II
Scientific Calculator
 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.
Entry line SR-270II 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. 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
M Independent memory
– Result 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
  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
DEG

74 – 8 ÷ 7
66.
Indicator
Entry line
Result line
Indicator

Citizen SR-270II Specifications

General

Type	Scientific Calculator
Display	LCD
Power Source	Battery
Battery Type	LR44
Number of Batteries	1
Display Digits	10

Summary

Calculator Basics and Operation

Turning On/Off and Battery

Guidance on powering the calculator on/off and replacing batteries.

Auto Power-Off and Reset

Information on automatic power-off and calculator reset procedures.

Display and Modes

Display Readout and Adjustment

Details on screen display elements, indicators, and contrast adjustment.

Mode Selection

How to select different calculation modes for the calculator.

Input and Editing Functions

Using the 2nd Key and Cursor

Explains how to use the 2nd function key and navigate the cursor.

Input Correction and Replay

Methods for correcting input errors and using the replay function.

Error Display and Memory

Handling errors and managing calculator memory for calculations.

Calculation Mechanics

Stack Operation

Explanation of the calculator's internal memory stack for calculations.

Order of Operations

Details on the precedence rules for performing calculations.

Accuracy and Input Ranges

Accuracy and Capacity

Information on output digits, calculating digits, and input ranges.

Calculation Error Handling

Error Conditions

Describes error messages and the conditions that cause them.

Basic and Advanced Calculations

Basic Calculation Types

Covers arithmetic, parentheses, and percentage calculations.

Display Formats and Notations

Explains different display notations like Norm, ENG, FIX, and SCI.

Scientific Functions

Answer Function

How to use the answer function to recall the most recent result.

Logarithms and Fractions

Calculations involving logarithms, antilogarithms, and fractions.

Advanced Conversions and Functions

Angle Unit Conversions

Converting between Degree, Radian, and Gradian angle units.

Trigonometric and Hyperbolic Functions

Using trigonometric and hyperbolic functions and their inverses.

Data Transformations

Conversions between sexagesimal/decimal and coordinate systems.

Statistical Calculations

Probability Functions

Details on nPr, nCr, and factorial calculations.

Standard Deviation

How to perform standard deviation calculations and input data.

Regression Analysis

Using regression modes for linear, logarithmic, exponential, and quadratic analysis.

Coordinate and Data Entry

Coordinate Transformations

Converting between rectangular and polar coordinate systems.

Data Input for Statistics

Methods for inputting individual and multiple data points.

Regression Analysis Details

Regression Variable Recall

Table showing how to recall various regression statistical variables.