HP HP-20S User manual

Scientific Calculator
Owner’s Manual
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HP-20S Scientific Calculator
Owner’s Manual
fi HEWLETT
PACKARD
Edition 5 August 1992
Part Number 00020-90001
@ The contents of this manual are printed on recycled paper.

Notice
For warranty and regulatory information for this calculator, see pages 117
and 120.
This manual and any examples contained herein are provided “as is” and
are subject to change without notice. Hewlett-Packard Company makes
no warranty of any kind with regard to this manual, including, but not
limited to, the implied warranties of merchantability and fitness for a
particular purpose. Hewlett-Packard Co. shall not be liable for any
errors or for incidental or consequential damages in connection with the
furnishing, performance, or use of this manual or the keystroke programs
contained herein.
o Hewlett-Packard Co. 1988. All rights reserved. Reproduction,
adaptation, or translation of this manual is prohibited without prior
written permission of Hewlett-Packard Company, except as allowed under
the copyright laws.
The programs that control your calculator are copyrighted and all rights
are reserved. Reproduction, adaptation, or translation of those programs
without prior written permission of Hewlett-Packard Co. is also
prohibited.
Corvallis Division
1000 N.E. Circle Blvd.
Corvallis, OR 97330, U.S.A.
Printing History
Edition 1 April 1988
Edition 2 September 1988
Edition 3 June 1989
Edition 4 August 1991
Edition 5§ August 1992

Welcome to the HP-20S
Your HP-20S is another example of the superior quality and attention
to detail in engineering and manufacturing that have marked
Hewlett-Packard products for more than 40 years. Hewlett-Packard
stands behind this calculator. We offer worldwide service and exper-
tise to support its use.
Hewlett-Packard Quality
Our calculators are made to excel, to last, and to be easy to use.
B This calculator is designed to withstand the drops, vibrations, pol-
lutants (smog, ozone), temperature extremes, and humidity
variations that it can be exposed to in everyday worklife.
B The calculator and its manual have been designed and tested for
ease of use. We added examples to the manual to highlight the var-
ied uses of this calculator.
B Advanced materials and permanent, molded-in key lettering pro-
vide a long keyboard life and a positive feel to the keyboard.
B CMOS (low-power) electronics and the liquid-crystal display allow
data to be retained even when the calculator is off and let the bat-
teries last a long time.
® The microprocessor has been optimized for fast and reliable com-
putations using 15 digits internally for precise results.
B Extensive research has created a design that has minimized the ad-
verse effects of static electricity (a potential cause of malfunctions
and data loss in calculators).
Welcome to the HP-20S 3

Features
4
Large 12-character display.
Ten data registers and 99 program lines.
One- and two-variable statistics with linear regression.
Probability functions.
Unit and base conversions.
Polar /rectangular conversions.
Hyperbolic functions.
Accurate math, 12-digits with a 10%%% exponent range.
Keystroke programming.
Six built-in programs:
Root finder.
Numerical integration.
Complex number operations.
=
n
u
® 3 X 3 matrix solutions.
® Quadratic equation.
u
Curve fitting.
Welcome to the HP-20S

Contents
1 9 Getting Started
9 Power On and Off
9 Adjusting the Display Contrast
9 Simple Arithmetic Calculations
12 Understanding the Display and Keyboard
12 The Cursor
12 Clearing the Calculator
12 Clearing Memory
13 Annunciators
14 The Shift Keys
14 The INPUT Key
14 The SWAP Key
15 The Alpha Keys
15 Introducing the Math Functions
16 Display Format of Numbers
17 Specifying the Number of Displayed Decimal
Places (FIX)
17 Displaying the Full Precision of Numbers
(ALL)
18 Scientific and Engineering Notation
19 Interchanging the Period and Comma
20 Full Precision of a Number (SHOW)
20 Range of Numbers
21 Messages
2 22 Arithmetic and Storage Registers
22 Chain Calculations
22 Operator Priority and Pending Operations
24 Using Parentheses
25 Reusing the Previous Result (LAST)
26 Exchanging Two Numbers (SWAP)
27 Using Storage Registers
Contents 5

Numeric Functions
30 General and Logarithmic Functions
31 Reciprocal
32 Percent Functions
32 Percent
33 Percent Change
34 Pi ()
34 Trigonometric Modes and Functions
34 Changing the Trigonometric Mode
35 Trigonometric Functions
36 Angle and Hour Conversions
38 Coordinate Conversions
39 Probability Functions
40 Hyperbolic Functions
41 Parts of Numbers
42 Unit Conversions
4 44 Base Conversions and Base Arithmetic
44 Switching Bases
47 Representation of Numbers
47 Range of Hexadecimal, Octal, and Binary Numbers
49 Arithmetic Operations
S 51 Statistical Calculations
51 Entering Statistical Data
53 Clearing Statistical Data
53 Summary of Statistical Calculations
54 Mean, Standard Deviation, and Summation
Statistics
55 Calculating the Population Standard Deviation
57 Linear Regression and Estimation
59 Weighted Mean
60 Statistical Formulas
6 Contents

61 Programming
64 Creating Programs
66 Program Boundaries (LBL and RTN)
67 Entering Programs
68 Positioning the Program Pointer
69 Running Programs
69 Starting Programs With XEQ
70 Starting Programs With GTO and R/S
70 Stopping Programs
71 Clearing Programs
71 Editing Programs
72 Stepping Through Programs
73 Sample Program: Pythagorean Theorem
75 Sample Program: Random Number Generator
76 Subroutines
80 Branching and Conditionals
80 Branching (GTO)
81 Conditional Instructions—Decisions and
Control
85 Keystrokes for Other Conditionals
87 Available Program Memory
87 Nonprogrammable Functions
88 Built-in Program Library
89 Root Finder (root)
91 Numerical Integration (int)
94 Complex Operations (CPL)
97 3 X 3 Matrix Operations (3 bY 3)
102 Quadratic Equation (qQUAd)
105 Curve Fitting (Fit)
Contents
7

Appendix
109 Assistance, Batteries, Memory, and Service
109 Obtaining Help in Operating the Calculator
109 Answers to Common Questions
111 Power and Batteries
111 Low Power Annunciator ]
111 Installing Batteries
113 Resetting the Calculator
114 Erasing Continuous Memory
114 Environmental Limits
114 Determining if the Calculator Requires Service
116 Confirming Calculator Operation—the Self-Test
117 Limited One-Year Warranty
117 What is Covered
117 What is Not Covered
118 Consumer Transactions in the United Kingdom
118 If the Calculator Requires Service
118 Obtaining Service
119 Service Charge
119 Shipping Instructions
120 Warranty on Service
120 Service Agreements
120 Regulatory Information
122 Messages
124 Index
Contents