Citizen SRP-285II Manual

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General Guide .................................................		3
	Turning On And Off ............................................	3
	Battery Replacement..........................................	3
	Auto Power-Off Function ...................................	3
	Reset Operation .................................................	3
	Contrast Adjustment ..........................................	3
	Display Readout .................................................	4
Before starting calculation .............................		5
	Changing a mode ...............................................	5
	Selecting an item from display menus ..............	5
	Using " 2nd " Keys.............................................	5
	Cursor ................................................................	5
	Making corrections during input .......................	6
	Replay function ..................................................	6
	Error Position Display Function ........................	6
	Memory Calculation ...........................................	6
	Order Of Operations ..........................................	7
	Accuracy And Capacity ......................................	8
	Error Conditions ..............................................	10
Mode 0 - MAIN ...............................................		11
	Arithmetic Calculations ...................................	11
	Display formats ................................................	11
	Parentheses Calculation..................................	11
	Percentage Calculation....................................	12
	Continuous calculation function .....................	12
	Answer Function ..............................................	12
	Logarithm And Antilogarithm...........................	12
	Fraction Calculation.........................................	12

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	Angle Unit Conversion			.....................................						13
	Trigonometric / Inverse ............-Tri. Functions									14
	Hyperbolic / Inverse-Hyp. ...............Functions									14
	Coordinates Transformation ............................									14
	Probability........................................................									14
	Other Functions ( X	–1	,	√	,	X	, X	2	, ^ )	15
	Other Functions ( X		,		,		, X		, ^ )	15
	Unit Conversions .............................................									15
	Physics Constants ...........................................									15
Mode 1 - STAT................................................										16
	Single-Variable / Two-Variable .........Statistics									16
	Process capability............................................									17
	Probability distribution ....................................									17
	Linear regression.............................................									18
	Correcting data ................................................									18
Mode 2 - Base-n.............................................										19
	Bases conversions	..........................................								19
	Negative expression ........................................									19
	Basic arithmetic operations ............for bases									20
	Logical operation .............................................									20
Mode 3 - CPLX ...............................................										20
Mode 4 - VLE .................................................										20
Mode 5 - QE ...................................................										20

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General Guide

Turning On And Off

To turn the calculator on, press [ ON ] ; To turn the calculator off, press [ 2nd ] [ OFF ].

Battery Replacement

SRP-285II 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 ), 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 6~12 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 [	] 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.

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.

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Number of decimal places displayed is fixed Hyperbolic-trig function will be calculated While an operation is executing

2nd set of function keys is active. Mode selection is active

Main mode is active Statistics mode is active Base-n mode is active

Variable linear equation mode is active Quadratic equation mode is active Complex number mode is active

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.

The following indicators appear on the display to indicate you the current status of the calculator.

Meaning

Independent memory

SRP-285II displays an entry of up to 76 digits. Entries begin on the left ; those with more than 11 digits scroll to the left. Press [ ] and [ ] to move the cursor through an entry. Press [ 2nd ] [ ] or [ 2nd ] [ ] to move the cursor immediately to the beginning or end of the entry.

It displays a result of up to 10 digits, as well as a

Display Readout

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

Indicator	M AI N	Indicator
Indicator	M AI N

Entry line 74 – 8 ÷ 7

66. Result line

Entry line

Result line

Indicators

Indicator

–Result is negative

2nd MODE MAIN STAT Base-n VLE QE CPLX

DEGRAD Angle mode : DEGrees, GRADs, or RADs ENGSCI ENGineering or SCIentific notation

TAB

HYP

BUSY

There are digits to the left or right of the display There are earlier or later results that can be displayed

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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 [		] or [	] until "
2)Base-n " is shown, then enter the desired mode by
pressing [	].

Method 2 : Key in directly the number of the mode, [ 2 ] , to enter the desired 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 [ ] while the item is underlined.

For menu items		followed by an argument value, you can press
[	] while	the item is underlined or enter directly the

corresponding argument value.

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

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.

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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.

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

z This function stores the latest operation executed. After execution is complete, 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 Example 1.

z The replay function can keep input digits up to 254 characters for SRP-285II. After execution is complete or during entering, you can

press either [

] or [

] 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 [ ] 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

zPress [ M+ ] to add a result to running memory. Press [ 2nd ] [ 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.

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