Citizen SRP-285II User Manual
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
E – 1
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
Unit Conversions .............................................15
Physics Constants ...........................................15
Mode 1 - STAT................................................16
Single-Variable / Tw o-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
E – 2
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.
E – 3
Display Readout
The display comprises the entry line, the result line, and indicators.
Ind ica tor
Entry line
SRP-285II displays an entry of up to 76 digits. Entries
Entry line
Result line
The following indicators appear on the display to
Indicators
Indicator Meaning
Independent memory
M
Result is negative
–
2nd set of function keys is active.
2nd
Mode selection is active
MODE
Main mode is active
MAIN
Statistics mode is active
STAT
Base-n mode is active
Base-n
Variable linear equation mode is active
VLE
Quadratic equation mode is active
QE
Complex number mode is active
CPLX
Angle mode :
DEGRAD
ENGSCI ENG
Number of decimal places displayed is fixed
TAB
Hyperbolic-trig function will be calculated
HYP
While an operation is executing
BUSY
There are digits to the left or right of the display
There are earlier or later results that can be displayed
MAIN
74 – 8 ÷ 7
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
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.
indicate you the current status of the calculator.
rees,
DEG
ineering or
entific notation
SCI
GRAD
66.
s, or
RAD
Indi cat or
Result line
s
E – 4
Before starting calculation
Changing a mode
Pressing [ MODE ] can enter mode menus. You can choose one of
six operating modes, including "
"
", "
3)CPLX
Give "
2)Base-n
Method 1 : Scroll through the menus using [ ] or [ ] until "
Method 2 : Key in directly the number of the mode, [ 2 ] , to enter
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
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 "
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 "
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.
", "
4)VLE
5)QE
" as an example :
2)Base-n " is shown, then enter the desired mode by
pressing [ ].
the desired mode immediately.
cursor [ ] or [ ] to an item you want. Press [ ]
while the item is underlined.
".
0) MAIN
", "
1)STAT
", "
" indicator.
2nd
2)Base-n
2nd
",
"
E – 5
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
To clear all characters, clear all input character by [ CL ] key.
z
z
z
z
as " _ " and it means the calculator is in overwrite mode.
Replay function
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.
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
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 [ 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.
E – 6
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