Citizen SRP-280 User manual

File name: HDBMSR19R73_Cover_ok.doc version : 2010/07/12
SIZE:135x75mm
PARTS NO. HDBMSR19R73 (SR19)
Scientific Calculator
SRP-280/SRP-285
Instruction Manual
Manual de Instrucciones
Livro de Especificacoes
A
nweisungshandbuch
Manuel d’instructions
Istruzioni all’Uso
Gebruiksaanwijzing
Manual
Инструкция по зксплуатции
Instrnkcja Obsługi

File name: HDBMSR19R73_Cover_ok.doc version : 2010/07/12
SIZE:135x75mm
PARTS NO. HDBMSR19R73 (SR19)
Printed in China HDBMSR19R73 XXX

E - 1
Table of Contents
1. General Guide ....................................................... E - 2
1 - 1 Powersupply ............................................................. E - 2
1 - 2 Contrast adjustment ................................................ E - 2
1 - 3 Display readout ......................................................... E - 3
1 - 4 Key markings ............................................................. E - 3
1 - 5 Before starting calculations ..................................... E - 4
Selecting a mode ......................................................... E - 4
Selecting an item from display menus ........................... E - 4
Using “ 2nd ” keys ....................................................... E - 4
Cursor ........................................................................ E - 4
Making corrections during input .................................. E - 4
Replay function ............................................................ E - 5
Error position display function ...................................... E - 5
Memory function .......................................................... E - 5
Order of operations ..................................................... E - 6
Accuracy and Capacity ................................................ E - 6
Error conditions .......................................................... E - 8
2. Mode 0 - MAIN ....................................................... E - 9
2 - 1 Arithmetic calculation ............................................... E - 9
2 - 2 Display formats ......................................................... E - 9
2 - 3 Parentheses calculations ........................................ E - 10
2 - 4 Percentage calculation ............................................ E - 10
2 - 5 Continuous calculation function ........................... E - 10
2 - 6 Answer function ....................................................... E - 11
2 - 7 Logarithms and Antilogarithms ............................. E - 11
2 - 8 Fraction calculation ................................................. E - 11
2 - 9 Angle units conversion ........................................... E - 11
2 - 10 Trigonometric / Inverse-Tri. functions ................... E - 12
2 - 11 Hyperbolic / Inverse-Hyp. functions ....................... E - 12
2 - 12 Coordinates transformation ................................... E - 12
2 - 13 Probability ................................................................ E - 13
2 - 14 Other functions ....................................................... E - 13
2 - 15 Unit conversion ....................................................... E - 13
2 - 16 Physics constants .................................................... E - 13
3. Mode 1 - STAT ....................................................... E - 14
4. Mode 2 - Base-n .................................................. E - 15
4 - 1 Bases conversions .................................................. E - 15
4 - 2 Negative expressions .............................................. E - 16
4 - 3 Basic arithmetic operations for bases .................... E - 16
4 - 4 Logical operations ................................................... E - 16
5. Mode 3 - CPLX .................................................... E - 16
6. Mode 4 - VLE ....................................................... E - 16
7. Mode 5 - QE ......................................................... E - 16

E - 2
1 General Guide
1 - 1 Power supply
 
 
 Turning on or off
To turn the calculator on, press [ ON ] ; To turn the calculator off, press
[ 2nd ] [ OFF ].
 
 
 Battery replacement
SRP-280 is powered by two alkaline batteries (GP76A). SRP-285 is dual
power system which is powered by one alkaline battery (GP76A) and a solar
cell. If the display becomes dim and difficult to read (especially when lighting
is dim for SRP-285), 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 ] to turn the power on.
 
 
 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 ] key and the display,
memory, settings are retained.
 
 
 Reset operation
If the calculator is on but you get unexpected results, press [ 2nd ]
[ RESET ] in sequence. A message appears on the display to confirm whether
you want to reset the calculator and clear memory contents.
RESET : N Y
Move the cursor to “ Y” by [], then press [ ENTER ] to clear all variables,
programs, pending operations, statistical data, answers, all previous entries,
and memory; To abort the reset operation without clearing the calculator,
please choose “ N” .
If the calculator is lock and further key operations becomes impossible, please
press [ 0 ] [ DMS ] at the same time to release the condition. It will return all
settings to default settings.
1 - 2 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 display
become respectively lighter or darker.

E - 3
1 - 3 Display readout
The display comprises the entry line, the result line, and indicators.
Entry line SRP-280 displays an entry of up to 76 digits. SRP-285 displays
an entry of up to 80 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. Press [ 2nd ] [] or [ 2nd ] [] to
move the cursor immediately to the beginning or end of the
entry.
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. Results that exceed the digit limit are
displayed in scientific notation.
Indicators The following indicators appear on the display to indicate you
the current status of the calculator.
Indicator Meaning
MIndependent memory
–Result is negative, or the entry line is full
2nd 2nd set of function keys is active.
MODE Mode selection is active
MAIN Main mode is active
STAT Statistics mode is active
Base-n Base-n mode is active
VLE Variable linear equation mode is active
QE Quadratic equation mode is active
CPLX Complex number mode is active
DEGRAD Angle mode : DEGrees, GRADs, or RADs
ENGSCI ENGineering or SCIentific notation.
TAB 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
1 - 4 Key markings
Many of the calculator’s keys are used to perform more than one function. The
functions marked on the keyboard are printed differently to help you find the one
you need quickly and easily.
Keyboard marking Meaning
White Direct input
Yellow Press [ 2nd ] and then key
Green Press key in Base-n mode
MAIN 
74 – 8 ÷ 7
66.
Indicator
Entry line
Result line
Indicator

E - 4
1 - 5 Before starting calculation
 
 
 Changing a mode
Pressing [ MODE ] can enter mode menus. You can choose one of six oper-
ating modes, including “ 0)MAIN ”, “ 1)STAT ”, “ 2)Base-n ”, “ 3)CPLX ”,
“ 4)VLE ”, “ 5)QE ”.
Give “ 2)Base-n ” as an example :
Method 1 : Scroll through the menus using [] or [] until
“ 2)Base-n ” is shown, then enter the desired mode by
pressing [ ENTER ].
Method 2 : Key in directly the number of the mode, [ 2 ] , to enter the mode
immediately.
 
 
 Selecting an item from display menus
Many functions and settings are available on menus. A menu is a list of
options displayed across the entry line.
Give “ Pressing [ DRG ] key displays the menu for choosing the angle setting
under MAIN mode ” as an example :
Method : Press [ DRG ] to display the menu, and then move the cursor
[] or [] to an item you want. Press [ ENTER ] while the item
is underlined.
For menu items followed by an argument value, enter the argument value
while the item is underlined. The item and the argument value are displayed
in the previous screen.
 
 
 Using “ 2nd ” keys
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 [] or [] 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 [

] or [

] 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
[] or [] to move the cursor, and then press [ DEL ] to delete the character.
Besides, holding down [ DEL ] can deletes all characters to the right ; then,

E - 5
deletes 1 character to the left of the cursor each time you press [ DEL ].
To replace a character, make the character underlined by using [] or []
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 [ CL ] key.
 
 
 Replay function
• Thisfunctionstoresthelatest operation executed.After execution iscomplete,
pressing [] or [] key will display the operation from the beginning or the
end. You can continue moving the cursor by [] or [] to edit it. To delete
a digit, press [ DEL ]. ( or, in overwrite mode, just type over the digit). See
Example1.
• The replay function can keep input digits up to 228 characters for SRP-280
or 320 characters for SRP-285. After execution is complete or during
entering, you can press either [] [] 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 [ CL ] is pressed or
power is turned off, so contents can be recalled even after [ CL ] is
pressed. However, replay function is cleared when mode or opera-
tion is switched.
 
 
 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 []
or [] to move the cursor and then give it a correct entry. You can also clear
an error by pressing [ CL ] and then re-entered the values and expression
from the beginning. See Example 3.
 
 
 Memory calculation
• Press [ M+ ] to add a result to running memory. Press [ M– ] to subtract
the value from running memory. To recall the value in running memory,
press [ MRC ]. To clear running memory, press [ MRC ] twice. See
Example 4.
• The calculator has eight memory variables for repeated use : A, B, C, X,
Y, X1, X2, PROG . You can store a real number in variables A, B, C, X, Y, X1,
X2 and an expression in PROG . See Example 5.
* [ P/V RCL ] recalls all variables.

E - 6
* [ SAVE ] lets you store values to variables.
* [ 2nd ] [ RECALL ] recalls the value of variable.
* [ 2nd ] [ CL-VAR ] clears all variables except
PROG .
* [ 2nd ] [ CL-PROG ] clears the contents of
PROG .
 
 
 Order of operations
Each calculation is performed in the following order of precedence :
1) Expression inside parentheses.
2) Coordinates transformation, and Type B functions which are
required pressing the function key before entering, for example,
sin, cos, tan, sin –1, cos –1, tan –1, sinh, cosh, tanh, sinh –1,
cosh –1, tanh –1, log, ln, 10 X , e X, √, NEG, NOT, X ’( ), Y ’( ).
3) Type A functions which are required entering values before
pressing the function key, for example, X 2, °‘“ , !, X –1, %,
r, g.
4) Exponentiation ( ^ ), X√
5) Fractions
6) Abbreviated multiplication format in front of variables, π, RAND.
7) ( – )
8) Abbreviated multiplication format in front of Type B functions
2√3, Alog2, etc.
9) nPr, nCr
10) x , ÷
11) +, –
12) AND, NAND
13) OR, XOR, XNOR
14) Conversion (A b/c 
d/e, F
 D, DMS)
• When functions with the same priority are used in series,
execution is performed from right to left.
e X ln120→ e X { ln (120 ) }
otherwise, execution is from left to right.
• Compound functions are executed from right to left.
• Anything contained within parentheses receives the highest
priority.
 
 
 Accuracy and Capacity
Output accuracy : ± 10th digit
Internal digits : SRP-280 →24 digits
SRP-285 →14 digits
In general, every reasonable calculation is displayed up to 10 digits mantissa,
or 10-digits mantissa plus 2-digits exponent up to 10 ± 99.
Numbers used as input must be within the range of the given function as follow
:

E - 7
Functions Input range
sin x, cos x, tan x Deg：| X | < 4.5 x 10 10 deg
Rad：| X | < 2.5 x 10 8πrad
Grad：| X | < 5 x 10 10 grad
however, for tan x
Deg：| X | ≠90 (2n+1)
Rad：| X | ≠(2n+1)
Grad：| X | ≠100 (2n+1)
( n is an integer)
sin -1 x, cos -1 x|X|≦1
tan -1 x|X|< 1 x 10 100
sinh x, cosh x | X | ≦230.2585092
tanhx | X | <1 x 10 100
sinh -1 x|X|< 5 x 10 99
cosh -1 x1≦X < 5 x 10 99
tanh -1 x|x|<1
log x, ln x 1 x 10 - 99≦X < 1 x 10 100
10 x-1 x 10 100 < X < 100
e x-1 x 10 100 <X≦230.2585092
X 0≦X < 1 x 10 100
x 2| X | <1 x 10 50
1 / x | X | <1 x 10 100, X≠0
3x|X|< 1 x 10 100
X ! 0≦X≦69 , X is an integer.
P ( x, y ) <1 x 10 100
R (r,θ) 0≦r <1 x 10 100
Deg：|θ| <4.5 x 10 10 deg
Rad：| θ| < 2.5 x 10 8πrad
Grad：| θ| < 5 x 10 10 grad
however, for tan x
Deg：| θ| ≠90 (2n+1)
Rad：| θ| ≠(2n+1)
Grad：| θ| ≠100 (2n+1)
(n is an integer)
DMS | DD | , MM, SS.SS < 1 x 10 100,
0≦MM, SS.SS
| x | < 2.777777777 x 10 96
X yX > 0 :– 1 x 10 100 < Y log X < 100
X = 0 :Y > 0
2
π
2
π
√
√
X2+Y2 √

E - 8
X < 0 :Y = n, 1/(2n+1), n is an integer.
but -1 x 10 100 < Y log | X | <100
XYy＞0 : x≠0, –1 x 10 100 <log Y <100
y = 0：x＞0
y < 0：x = 2n+1, I/n, n is an integer.(n≠0)
but – 1 x 10 100 <log | y | <100
nPr, nCr 0≦r≦n, n < 10 100, n,r are integers.
STAT | x | < 1x10 100,| y | < 1x10 100
SRP-280 : 1 -VAR : n≦40, 2 -VAR : n≦40
SRP-285 : 1 -VAR : n≦42, 2 -VAR : n≦42
FREQ. = n, 0≦ n < 10 100
__
σx, σy, x, y, a, b, r : n≠0
Sx, Sy :n≠0,1
Base-n DEC :
-2147483648≦X≦2147483647
BIN :
10000000000000000000000000000000≦X≦
11111111111111111111111111111111
(for negative)
0≦ X ≦ 01111111111111111111111111111111
(for zero, positive)
OCT :
20000000000≦X≦3777777777 (for negative)
0≦X≦17777777777 (for zero or positive)
HEX :
80000000≦X≦FFFFFFFF(for negative)
0≦X≦7FFFFFFF (for zero or positive)
 
 
 Error conditions
Error massage will appear on the display and further calculation becomes
impossible when any of the following conditions occur.
SRP-280 SRP-285
DOMAIN Er When specifying an argument to a DOM
function outside the valid range. Error
DOMAIN Er FREQ value ( in 1-VAR stats) < 0 FREQ DOMAIN
or non-integer. Error
DIVIDE BY O You attempted to divide by 0. DIVIDE BY O
Error
OVERFLOW Er When result of function calculations OVERFLOW
exceeds the range specified. Error
x
1
√x
1

E - 9
STAT Er When not in STAT mode,
pressing [ DATA ] or [ STATVAR ].
SYNTAX Er (1) Input errors are made. SYN
(2) When improper arguments are used Error
in commands or functions that require
arguments.
NO SOL There is no solution or infinite to NO SOL
MULTI SOLS the simultaneous equation under MULTI SOLS
VLEmode.
NO REAL SOL There is no real solution to quadratic NO REAL SOL
equation under QE mode.
LENGTH Er An entry for SRP-280 exceeds 84 digits IMP LENGTH
(The limit for SRP-285 is 88 digits) after Error
implied multiplication with auto-correction.
To release the above errors, please press [ CL ] key.
2 Mode 0 - MAIN
2 - 1 Arithmetic calculation
• Arithmetic operations are performed by pressing the keys in the same
sequence as in the expression. See Example 6.
• For negative values, press [ (–) ] before entering the value. See Example
7.
• For mixed arithmetic operations, multiplication and division are given
priority over addition and subtraction. See Example 8.
• Results greater than 1010 or less than 10 – 9 are displayed in exponential
form. See Example 9.
2 - 2 Display formats
• Decimal places formats are selected by pressing [ 2nd ] [ TAB ] to display
the menu. To set decimal places to n ( F0123456789 ), enter a nvalue
directly or press [ ENTER ] key while the item is underlined. (The default
setting is floating point notation F and the nvalue is •). See Example 10.
• Even if the number of decimal places is specified, internal calculation for
a mantissa is performed in 14 digits for SRP-285 and 24 digits for SRP-
280, and the display value is stored in 10 digits. To round off those values
to the specified number of decimal places, press [ 2nd ] [ RND ]. See
Example 11.

E - 10
• Number display formats are selected by pressing [ 2nd ] [ SCI/ENG ] to
display the menu. The items on the menu are FLO (for floating point), SCI
( for scientific), and ENG (for engineering). Press [] or [] until the
desired formats is underlined, and then press [ ENTER ]. See Example 12.
(Note) : The engineering format is similar to the scientific format, except
the mantissa can have up to three digits left of the decimal, instead
of only one, and the exponent is always a multiple of three. It is useful
for engineers to convert units based on multiples of 10 3.
• You can enter a number in mantissa and exponent form by [ EXP ] key. See
Example13.
2 - 3 Parentheses calculations
• Operation inside parentheses are always executed first. SRP-280 can
use up to 14 levels of consecutive parentheses in a single calculation.
SRP-285 can use up to 22 consecutive levels of parentheses in a single
calculation. See Example 14.
• Closed parentheses occurring immediately before operation of the
[ ENTER ] key may be omitted, no matter how many are required. See
Example 15.
• A multiplication sign “ x ” occurring immediately before an open parenthe-
sis can omitted. See Example 16.
(Note) : The calculator can auto-correct abbreviated multiplication in front
of all functions, except memory variables, left parenthesis, type B
functions.
• Henceforth, abbreviated type will not be used in this manual. See Example
17.
• The correct result cannot be derived by entering [ ( ] 2 [ + ] 3 [ ) ]
[ EXP ] 2. Be sure to enter [ x ] 1 between the [ ) ] and [ EXP ] in the below
example. See Example 18.
2 - 4 Percentage calculation
• [ 2nd ] [ % ] divides the number in the display by 100. You can use this key
sequence to calculate percentages, add-ons, discounts, and percentages
ratios. See Example 19.
2 - 5 Continuous calculation function
• The calculator enables you to repeat the last operation executed by
pressing [ = ] key for further calculation. See Example 20.
• Even if calculations are concluded with the [ = ] key, the result obtained can

E - 11
be used for further calculation. See Example 21.
2 - 6 Answer function
• Answer function stores the most recently calculated result. It is retained
even after the power is turned off. Once a numeric value or numeric expres-
sion is entered and [ ENTER ] is pressed, the result is stored by this
function. See Example 22.
(Note) : Even if execution of a calculation results in an error, however,
Answer memory retains its current value.
2 - 7 Logarithms and Antilogarithms
• The calculator can calculate common and natural logarithms and anti-
logarithms using [ LOG], [ LN ], [ 2nd ] [ 10 x], and [ 2nd ] [ e x]. See Example
23.
2 - 8 Fraction calculation
Fraction value display is as follow :
• To enter a mixed number, enter the integer part, press [ A b/c], enter the
numerator, press [ A b/c], and enter the denominator ; To enter an improper
fraction, enter the numerator, press [ A b/c], and enter the denominator. See
Example 24.
• During a fraction calculation, if the figure is reducible, a figure is reduced
to the lowest terms after pressing a function command key
( [ + ], [ – ], [ x ] or [ ÷ ] ) or the [ = ] key. By pressing [ 2nd ] [ A b/c  d/e], the
displayed value will be converted to the improper fraction and vice versa.
See Example 25.
• To convert between a decimal and fractional result, press [ 2nd ]
[ F  D ] and [ ENTER ]. See Example 26.
• Calculations containing both fractions and decimals are calculated in
decimal format. See Example 27.
2 - 9 Angle units conversion
• The angle units (DEG, RAD, GRAD) is set by pressing [ DRG ] to
display the angle menu. The relation among the three angle units is :
180 ° =πrad = 200 grad
Angle conversations ( See Example 28.) :
5/12 Display of 12
5
56 ∪∪
∪∪
∪
5/12 Display of 56 12
5

E - 12
1. Change the default angle settings to the units you want to
convert to.
2. Enter the value of the unit to convert.
3. Press [ DMS ] to display the menu. The units you can
select are ° (degrees), ‘(minutes), “(seconds), r (radians)
, g(gradians) or 

DMS (Degree-Minutes-Seconds).
4. Choose the units you are converting from.
5. Press [ ENTER ] twice.
• To convert an angle to DMS notation, select “

DMS ”, which converts an
entry to DMS notations, i.e., where 1O 30 I 0 II represents 1 degrees, 30
minutes, 0 seconds. See Example 29.
• To convert a DMS notation to decimal, select ° (degrees), ‘(minutes),
“(seconds). See Example 30.
2 - 10 Trigonometric / Inverse-Tri. functions
• SRP-280 / SRP-285 provides standard trigonometric functions and
inverse trigonometric functions - sin, cos, tan, sin –1, cos –1 and tan –1.
See Example 31.
(Note) : When using those keys, make sure the calculator is set for the
angle unit you want.
2 - 11 Hyperbolic / Inverse-Hyp. functions
• SRP-280 / SRP-285 uses [ 2nd ] [ HYP ] to calculate the hyperbolic
functions and inverse- hyperbolic functions - sinh, cosh, tanh, sinh –1,
cosh –1 and tanh –1. See Example 32.
(Note) : When using those keys, make sure the calculator is set for the
angle unit you want.
2 - 12 Coordinates transformation
• Pressing [ 2nd ] [ R  P ] displays a menu to convert rectangular coordi-
nates to polar coordinates or vice versa. See Example 33.
Rectangular Coordinates Polar Coordinates
x + y i= r (cos θ+ i sin θ)
(Note) : When using those key, make sure the calculator is set for the angle
unit you want.
Y
X
0
• P( x, y )
x
y
• P( r, θ)
0X
θ
r
Y

E - 13
2 - 13 Probability
• Pressing [ PRB ] displays the probability menu. See Example 34. With
the following functions :
nPr Calculates the number of possible permutations of n item taken
r at a time.
nCr Calculates the number of possible combinations of n items
taken r at a time.
!Calculates the factorial of a specified positive integer n ,
where n≦69.
< SRP-280 >
RANDM Generates a random number between 0 and 1.
< SRP-285 >
RAND Generates a random number between 0 and 1.
2 - 14 Other functions ( X–1, √√
√√
√,,
,,
,X√√
√√
√,,
,,
,X 2, ^ )
• The calculator also provides reciprocal ( [ X –1] ), square root ([√] ),
universal root [ X√], square ( [ X 2 ] ) and exponentiation ( [ ^ ] ) functions.
See Example 35.
2 - 15 Unit Conversion
• The calculators has a built-in unit conversion feature that enables you to
convert numbers from metric to English units and vice versa. See Example
36.
1. Enter the number you want to convert.
2. Press [ 2nd ] [ CONV ] to display the menu. There are 7 menus,
covering distance, area, temperature, capacity, weight, energy, and
pressure.
3. Use the [] [] to scroll through the list of units until a appropriate
units menu is shown, then [ ENTER ].
4. Pressing [] or [] can convert the number to another unit.
2 - 16 Physics constants
• You can use a number physics constants in your calculations. With the
following constants :
Symbol Meaning Value
cSpeed of light 299792458 m / s
gAcceleration of gravity 9.80665 m.s – 2
GGravitational constant 6.6725985 x 10 – 11 N.m 2kg – 2
Vm molar volume of ideal gas 0.0224141 m 3 mol – 1
NAAvagadro’s number 6.022136736 x 10 23 mol – 1
eElementary charge 1.6021773349 x 10 –19 C

E - 14
meElectron mass 9.109389754 x 10 –31 kg
mpProton mass 1.672623110 x 10 –27 kg
hPlank’s constant 6.626075540 x 10 –34 J.s
kBoltzmann’s constant 1.38065812 x 10 –23J.K–1
To insert a constant at the cursor position ( See Example 37.) :
1. Press [ CONST ] to display the physics constants menu.
2. Press [] until the constant you want is underlined.
3. Press [ ENTER ].
3 Mode 1 - STAT
There are three menu operation in statistics menu : 1 -VAR ( for analyzing
data in a single dataset), 2 - VAR ( for analyzing paired data from two
datasets ) and CLR- DATA ( for clearing all datasets). See Example 38.
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 To enter data for statistical analysis :
1. From the statistics menu, choose 1 -VAR or 2 - VAR.
2. Press [ DATA ].
3. Enter an X - values and press [].
4. Enter the frequency ( FREQ for SRP-280 / Ffor SRP-285) of the X
- value (in 1 -VAR mode) or the corresponding Y - value ( in 2 - VAR
mode ) and press [].
5. To enter more data, repeat from step 3.
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 To analyze data you have entered :
1. Press [ STATVAR ]. A range of statistical variables (see table
below ) is displayed on the statistical result menus. The first
variable ( n ) is underlined and its value is on the result line.
2. Press [] to scroll through the statistical results menu. The value
of each variable is displayed on the result line.
3. To use a value in a calculation, press [ ENTER ] when the values
is displayed. The values is copied to the entry line.
4. To predict a value for x ( or y ) given a value for y ( or x ), select the
x ’ ( or y ’ ) variable, press [ ENTER ], enter the given value, and
press [ ENTER ] again.
Variable Meaning
nNumber of x values or x-y pairs entered.
__
x or y Mean of the x values or y values
Sx or Sy Sample standard deviation of x values or y values.
σσ
σσ
σx or
σσ
σσ
σy Population standard deviation of x values or y values
ΣΣ
ΣΣ
Σxor ΣΣ
ΣΣ
ΣySum of all X values or y values
ΣΣ
ΣΣ
Σx 2or
ΣΣ
ΣΣ
Σy 2Sum of all x2 values or y 2 values

E - 15
ΣΣ
ΣΣ
Σx y Sum of (x x y) for all x-y pairs
aLinear regression y-intercept
bLinear regression slope
rCorrelation coefficient
x ’ Predicted x values given a, b, and a y values
y’ Predicted y value given a, b, and x value.
(Note) : If an error message appears in the display under STATVAR menu,
just pressing [] or [] can continue viewing next statistical vari-
able value.
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 To view or change data :
1. Press [ DATA ].
2. Press [] to scroll through the data you have entered.
3. To change an entry, display it and enter the new data. The new data
you enter overwrites the old entry. Press [] or [ ENTER ] to save the
change.
(Note) : Even you exit STAT mode, all data in 1 - VAR and 2 - VAR mode
are still retained unless you clear all data by selecting
CLR - DATA mode.
4 Mode 2 - Base-n
4 - 1 Bases conversions
• The number system (10, 16, 2 , 8 ) is set by pressing [ 2nd ] [ dhbo ] to display
the menu, making one of the items underlined followed [ ENTER ]. A
corresponding symbol - “d”, “h”, “b”, “o” appears on the display. (The
default setting is d: decimal base). See Example 39.
(Note) : The total range of numbers handled in this mode is 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, A, B, C, D, E, F. If values not valid for the particular number
system are used, attach the corresponding designator (d, h,b,o),
or an error message will appear.
Binary base ( b ) : 0, 1
Octal base ( o ) : 0, 1, 2, 3, 4, 5, 6, 7
Decimal base ( d ) : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Hexadecimal base ( h ) : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
• Pressing [ ] can use block function to display a result in octal or binary
base which exceeds 8 digits. The system is designed to display up to 4
blocks. See Example 40.

E - 16
4 - 2 Negative expressions
• In binary, octal, and hexadecimal bases, the calculator represents negative
numbers using complement notation. The complement is the result of
subtracting that number from 10000000000 in that number’s base by press-
ing [ NEG ] key in non-decimal bases. See Example 41.
4 - 3 Basic arithmetic operations for bases
• The unit enables you to calculate in number base other than decimal. The
calculator can add, subtract, multiply, and divide binary, octal, and hexa-
decimal numbers. See Example 42.
4 - 4 Logical operation
• Logical operations are performed through logical products (AND), nega-
tive logical (NAND), logical sums (OR), exclusive logical sums (XOR),
negation (NOT), and negation of exclusive logical sums (XNOR). See
Example43.
5 Mode 3 - CPLX
• Complex mode enables you to add, subtract, multiply, and divide complex
numbers. See Example 44. The results of a complex operation are dis-
played as follow :
Re Real value Im Imaginary value
ab Absolutevalue ar Argument value
6 Mode 4 - VLE
Variable linear equations (VLE) mode can solve a set of simultaneous
equations with two unknowns as follows :
a x + b y = c
d x + e y = f, where x and y are unknown.
• In VLE mode, you just enter each coefficient ( a, b, c, d, e, f) in the correct
order, and the calculator automatically solves for x, y. See Example 45.
7 Mode 5 - QE
Quadratic equations (QE) mode can solve a equations as follows :
a x 2+ b x + c = 0, where x is unknown.
• In QE mode, you just enter each coefficient ( a, b, c) in the correct order,
and the calculator automatically solves for all x values. See Example 46.

S - 1
Índice de Matérias
1. Guía general ......................................................... S - 2
1 - 1 Alimentación Eléctrica .............................................. S - 2
1 - 2 Ajuste de Contraste ................................................. S - 2
1 - 3 Lectura de la Visualización ....................................... S - 3
1 - 4 Marcación de las teclas ............................................. S - 4
1 - 5 Antes de empezar los cálculos ................................. S - 4
Seleccionandounmodo ............................................... S - 4
Seleccionando un elemento de los menús de la visualización
................................................................................... S - 4
Usando teclas “2nd” .................................................... S - 4
Cursor ........................................................................ S - 5
Haciendo correcciones durante la entrada ................... S - 5
Función de repetición (replay) ...................................... S - 5
Función de visualización de la posición de error ........... S - 6
Función de memoria .................................................... S - 6
Orden de operaciones ................................................. S - 6
Exactitudy Capacidad .................................................. S - 7
Condiciones de error ................................................... S - 9
2. Mode 0- MAIN......................................................... S - 9
2 - 1 Cálculo aritmético .................................................... S - 10
2 - 2 Formatos de visualización ...................................... S - 10
2 - 3 Cálculos de paréntesis ............................................ S - 10
2 - 4 Cálculo de porcentaje ............................................. S - 11
2 - 5 Función del cálculo continuo ................................. S - 11
2 - 6 Función de respuesta .............................................. S - 11
2 - 7 Logaritmos y Antilogaritmos .................................. S - 11
2 - 8 Cálculo de fracción .................................................. S - 12
2 - 9 Conversión de unidades del ángolo ...................... S - 12
2 - 10 Funciones Trigonometricas/Tri. Inversas .............. S - 13
2 - 11 Funciones Hiperbólicas/Hip. Inversas ................... S - 13
2 - 12 Transformación de coordenadas ........................... S - 13
2 - 13 Probabilidad ............................................................. S - 13
2 - 14 Otras funciones ....................................................... S - 14
2 - 15 Conversión de la unidad ......................................... S - 14
2 - 16 Constantes de Física ............................................... S - 14
3. Mode 1 - STAT ....................................................... S - 14
4. Mode 2 - Base-n .................................................. S - 16
4 - 1 Conversiones de bases ........................................... S - 16
4 - 2 Expresiones negativas ............................................ S - 16
4 - 3 Operaciones aritméticas básicas para bases .......... S - 17
4 - 4 Operaciones lógicas ................................................ S - 17
5. Mode 3 - CPLX .................................................... S - 17
6. Mode 4 - VLE ....................................................... S - 17
7. Mode 5 - QE ......................................................... S - 17

S - 2
1 Guía GeneraI
1 - 1 Alimentación eléctrica
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 Encendiendo o apagando
Para encender la calculadora, presionar [ ON ]: para apagar la calculadora,
presionar [ 2nd ] [ OFF ].
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 Reemplazo de batería
SRP-280 se impulsa por dos baterías alcalinas (GP76A). SRP-285 es un
sistemade alimentacióneléctrica dual quese impulsapor unabatería alcalina
(GP76A) y una célula solar. Si la visualización se pone oscuro y difícil de leer
(sobre todo cuando la iluminación es oscuro para SRP-285), las baterías
deben ser reemplazadas lo más pronto posible.
Para reemplazar las baterías :
1) Quite los tornillos y la tapa de la parte trasera.
2) Reemplace las baterías viejas e instale las nuevas con la polaridad
en dirección correcta y luego fija los tornillos en el lugar y presiona
[ ON ] para encender la corriente.
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 Función auto desactivadora
Esta calculadora se apaga automáticamente cuando no operada por
aproximadamente 9 -15 minutos.Puede reactivarse presionando la tecla
[ON] y la visualización, memoria y configuración son conservadas.
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 Operación Restablecer
Silacalculadoraestáencendidaperoustedconsigueresultadosinesperados,
presionar [ 2nd ] [ RESET ] en secuencia. Un mensaje aparece en la
visualización para confirmar si usted quiere restablecer la calculadora y
borrar los contenidos de la memoria.
RESET : N Y
Mueva el cursor a “ Y” a través [], luego presionar [ ENTER] para borrar
todas las variables, programas, operaciones pendientes, datos estadísticos,
respuestas, todas las entradas anteriores, y memoria; para abortar la
operación restablecer sin borrar la calculadora, por favor escoja “ N” .
Si la calculadora está encasquillada y las operaciones con teclas se ponen
imposibles, por favor presionar [ 0 ] [ DMS ] al mismo tiempo para soltar la
condición. Eso devolverá todas las configuraciones para las configuraciones
predefinidas.
1 - 2 Ajuste del contraste
Presionando la tecla [] o [] seguida de [ MODE ] puede hacer el contraste
de la pantalla más clara o más oscura. Dominando cualquier tecla abajo hará