Citizen SR-281 User Manual

-E1-
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
Using " MODE " keys....................................................................... 4
Using " 2nd " Keys........................................................................... 4
Corrections ...................................................................................... 4
Undo function .................................................................................. 4
Replay function................................................................................ 5
Memory calculation..........................................................................5
Order of operations.......................................................................... 6
Accuracy and Capacity .................................................................... 7
Error conditions ...............................................................................9
Basic Calculations ............................................................................ 9
Arithmetic calculation..................................................................... 10
Parentheses calculations............................................................... 10
Percentage calculation .................................................................. 11
Display notations ........................................................................... 11
Scientific Functional Calculations.................................................13
Logarithms and Antilogarithms ...................................................... 13
Fraction calculation ....................................................................... 13
Angle unit conversions .................................................................. 14
Sexagesimal
↔
Decimal transformation........................................ 15
Trigonometric / Inverse-Tri. functions ............................................ 15
Hyperbolic / Inverse-Hyp. functions............................................... 16
Coordinates transformation ........................................................... 16
Probability...................................................................................... 17
Other functions ( 1/x,
,
3
,
X
, x
2
, x
3
, x
y
, INT, FRAC )........18
Unit Conversion ............................................................................. 19
Physics constants ..........................................................................19
Base–n calculations........................................................................ 24
Bases conversions ........................................................................25
Block Function ............................................................................... 25
Basic arithmetic operations for bases............................................ 27
Negative expressions .................................................................... 27
Logical operation ........................................................................... 27
Statistical Calculations ................................................................... 27
Entering data ................................................................................. 28
SR-281 / SR-282
Scientific Calculator

Citizen SR-281 Specifications

General

Brand	Citizen
Model	SR-281
Category	Calculator
Language	English

Summary

General Guide

Turning on or off

Instructions for powering the calculator on and off using the ON/C and 2nd/OFF keys.

Battery replacement

Details on battery types and replacement procedure for SR-281 and SR-282 models.

Reset operation

Procedure to reset the calculator to default settings and clear memory contents.

Display readout

Explanation of the calculator's two-line display and indicators.

Calculation Setup

Before Starting Calculation

Guide to using MODE and 2nd keys for selecting calculation modes.

Corrections

Methods for correcting input errors using CE, backspace, and ON/C keys.

Memory calculation

Instructions on using memory variables (A-Y) for storing and recalling values.

Order of operations

Explanation of the precedence rules for performing calculations.

Basic Calculations

Arithmetic calculation

Performing basic arithmetic operations and handling negative numbers.

Parentheses calculations

Using parentheses to control calculation order and nesting levels.

Percentage calculation

Methods for calculating percentages, add-ons, and discounts.

Scientific Calculations

Logarithms and Antilogarithms

Calculating common and natural logarithms and anti-logarithms.

Fraction calculation

Entering, displaying, and converting fractional values.

Angle unit conversions

Converting between degrees, radians, and grads.

Trigonometric functions

Using sine, cosine, tangent, and their inverse functions.

Hyperbolic functions

Calculating hyperbolic and inverse hyperbolic functions.

Coordinates transformation

Converting between rectangular and polar coordinate systems.

Probability

Using functions for permutations (nPr), combinations (nCr), and factorials (X!).

Other functions

Utilizing functions like reciprocal, roots, powers, INT, and FRAC.

Specialized Modes

Unit Conversion

Feature for converting numbers between various units like distance and temperature.

Physics Constants

Accessing and using 136 fundamental physics constants in calculations.

Base-n Calculations

Performing calculations in binary, octal, and hexadecimal number bases.

Complex Calculations

Performing addition, subtraction, multiplication, and division of complex numbers.

Statistical Calculations

Entering data

Syntax for inputting single-variable and paired-variable statistical data.

Displaying results

Recalling statistical variables like mean, standard deviation, and correlation.

Deleting and Editing Data

Procedures for deleting and editing stored statistical data.

FULL message

Understanding the 'FULL' message indicating data entry limits.