Citizen SRP-280 Bedienungsanleitung

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1General Guide .......................................3

1–1 Power supply..................................................3

1–2 Contrast Adjustment ......................................3

1–3 Display Readout .............................................3

1–4 Key markings..................................................3

1–5 Before Starting Calculation............................3

　Changing a mode ............................................. 3

　Selecting an item from display menus...............3

　Using " 2nd " Keys ...........................................3

　Cursor..............................................................3

　Making corrections during input ........................3

　Replay function ................................................3

　Error Position Display Function ........................3

　Memory Calculations........................................3

　Order Of Operations.........................................3

　Accuracy And Capacity.....................................3

　Error Conditions ...............................................3

2Mode 0 - MAIN.......................................3

2–1 Arithmetic Calculations..................................3

2–2 Display formats ..............................................3

2–3 Parentheses Calculation ................................3

2–4 Percentage Calculation ..................................3

2–5 Continuous calculation function ...................3

2–6 Answer Function ............................................3

2–7 Logarithm And Antilogarithm.........................3

2–8 Fraction Calculation.......................................3

2–9 Angle Unit Conversion ...................................3

2–10 Trigonometric / Inverse-Tri. Functions ..........3

2–11 Hyperbolic / Inverse-Hyp. Functions .............3

2–12 Coordinates Transformation ..........................3

2–13 Probability ......................................................3

2–14 Other Functions ( X–1, √, X, X 2, ^ ) ...........3

2–15 Unit Conversions............................................3

2–16 Physics Constants..........................................3

3Mode 1 - STAT .......................................3

4Mode 2 - Base-n ....................................3

4 – 1 Bases conversions.........................................3

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4 – 2 Negative expression.......................................3

4 – 3 Basic arithmetic operations for bases...........3

4 – 4 Logical operation ...........................................3

5Mode 3 - CPLX ......................................3

6Mode 4 - VLE.........................................3

7Mode 5 - QE...........................................3

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1 General Guide

1–1 Power supply

Turning On And 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 battery :

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 [ X], 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

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Pressing the [ T] or [ S] 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.

1–3 Display Readout

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

MA IN

7 – 8 ÷7

66.

Entry line

Indicator

Result line

Indicator

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 [ X] and [ W] to move the cursor through an

entry. Press [ 2nd ] [ X] or [ 2nd ] [ W] 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

M Independent memory

– Result is negative, or the entry line is full

2nd 2nd set of function keys is active.

MAIN Main mode is active

MODE Mode selection 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

»¼There are digits to the left or right of the display

½¾There are earlier or later results that can be displayed

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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.

Keyboardmarking Meaning

White Direct input

Yellow Press [2nd] and then key

Green Press key in Base-n mode

1–5 Before Starting Calculation

Changing a mode

Pressing [ MODE ] can enter mode menus. You can choose one of

six operating 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 [ W] or [ X] 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 [ W] or [ X] 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

To execute the functions marked in yellow, please press [ 2nd ] and

then the corresponding key. 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

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Pressing [ W] or [ X] 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 [ T] or [ S] 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 [ W] or [ X] to move the cursor, and then press [ DEL ] to

delete the character. Besides, holding down [ DEL ] can deletes all

characters to the right ; then, deletes 1 character to the left of the

cursor each time you press [ DEL ].

To replace a character, make the character underlined by using [ W]

or [ X] 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 " W" 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

zThis function stores the latest operation executed. After execution

is complete, pressing [ T] or [ S] key will display the operation

from the beginning or the end. You can continue moving the

cursor by [ X] or [ W] to edit it. To delete a digit, press [ DEL ]. ( or,

in overwrite mode, just type over the digit). See Example 1.

zThe 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 [ W] [ X] 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 operation is switched.

Error Position Display Function

zWhen a mathematically illegal calculation is performed, error

position display function will tell you with the cursor where the

error is. Press [ X] or [ W] to move the cursor and then give it a

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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 Calculations

zPress [ 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.

zThe 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.

* [ 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, 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,

4) Exponentiation ( ^ ), X

5) Fractions

6) Abbreviated multiplication format in front of variables,π, RAND.

7) ( – )

8) Abbreviated multiplication format in the front of Type B functions,

23, Alog2, etc.

9) nPr, n Cr

10) x ,

11) +, –

12) AND, NAND

13) OR, XOR, XNOR

14) Conversion( Ab/cd/e, F D, DMS )

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• When functions with the same priority are used in series,

execution is performed from right to left.

Xln120 Æe 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 digits : ±10th digit

Calculating 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 :

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 ≠2

π(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

tanh x x <1 x 10 100

sinh –1 x x <5 x 10 99

cosh –1 x 1 ≤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

ex –1 x 10 100 <x ≤230.2585092

x0 ≤x <1 x 10 100

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x2 x <1 x 10 50

1 / x x <1 x 10 100, x ≠0

x <1 x 10 100

x ! 0 ≤x ≤69, x is an integer.

P (x, y) 22 y+x <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│≠ 2

π(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 10100 <y log x <100

x = 0 : y >0

x <0 : y = n, 1/(2n+1), n is an integer.

but –1 x 10100 <Y log ⏐x⏐<100

y >0 : x ≠0, –1 x 10100 <x

1 log Y <100

y = 0 : x >0

y <0 : x=2n+1, l/n, n is an integer.(n≠0)

but –1 x 10100 <x

1 log ⏐y⏐<100

nPr, nCr 0 ≤r ≤n, n ≤10 100, n,r are integers.

STAT x <1 x 10 100 , y <1 x 10 100

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,

,y,a, b, r : n≠0 ;

Sx, Sy：n, n≠0, 1

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Base–n DEC :

– 2147483648 ≤X ≤2147483647

BIN :

10000000000000000000000000000000 ≤X ≤

11111111111111111111111111111111 (for negative)

0 ≤X ≤01111111111111111111111111111111

(for zero, positive)

OCT :

20000000000 ≤X ≤37777777777(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 message 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

function outside the valid range.

DOMAIN

Error

DOMAIN Er

FREQ value (in 1-VAR stats) <0

or non-integer.

FREQ DOMAIN

Error

DIVIDE BY 0

You attecmpted to divide by 0

DIVIDE BY 0

Error

OVERFLOW Er

When result of function

calculations exceeds the range

specified.

OVERFLOW

Error

STAT Er

When not in STAT mode, pressing

[ DATA ] or [ STATVAR ].

STAT

Error

SYNTAX Er

(1) Input errors are made.

(2) When improper arguments

are used in commands or

functions that require

arguments.

SYN

Error

NO SOL

MULTI SOLS

There is no solution or infinite to

the simultaneous equation under

VLE mode.

NO SOL

MULTI SOLS

NO REAL SOL

There is no real solution to

quadratic equation under QE

mode.

NO REAL SOL

LENGTH Er

An entry for SRP-280 exceeds 84

digits (The limit for SRP-285 is 88

IMP LENGTH

Error

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