Citizen SRP-280 User Manual
1 General Guide .......................................3
1–1
1–2
1–3
1–4
1–5
2 Mode 0 - MAIN.......................................3
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
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
3 Mode 1 - STAT .......................................3
4 Mode 2 - Base-n ....................................3
4 – 1 Bases conversions......................................... 3
Power supply.................................................. 3
Contrast Adjustment ......................................3
Display Readout .............................................3
Key markings..................................................3
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
Arithmetic Calculations..................................3
Display formats ..............................................3
Parentheses Calculation ................................3
Percentage Calculation ..................................3
Continuous calculation function ...................3
Answer Function ............................................3
Logarithm And Antilogarithm.........................3
Fraction Calculation.......................................3
Angle Unit Conversion ...................................3
E – 1
4 – 2 Negative expression.......................................3
4 – 3 Basic arithmetic operations for bases...........3
4 – 4 Logical operation ...........................................3
5 Mode 3 - CPLX ......................................3
6 Mode 4 - VLE.........................................3
7 Mode 5 - QE........................................... 3
E – 2
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
E – 3
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.
Indicator
Entry line
SRP-280 displays an entry of up to 76 digits. SRP-285
Entry line
Result line
The following indicators appear on the display to
Indicators
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 :
ENGSCI
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
» ¼
There are earlier or later results that can be displayed
½ ¾
MA IN
7 – 8 ÷ 7
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.
It displays a result of up to 10 digits, as well as a
decimal, a negative sign, 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
ENG
ineering or
GRAD
entific notation
SCI
½
66.
" indicator, and a
x10
s, or
RAD
Ind ica tor
Result line
s
E – 4
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
1–5 Before Starting Calculation
Changing a mode
Pressing [ MODE ] can enter mode menus. You can choose one of
six operating modes, including "
"
", "
", "
3)CPLX
Give "
Method 1 : Scroll through the menus using [ W ] or [ X ] until "
Method 2 : Key in directly the number of the mode, [ 2 ] , to enter
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, enter the argument
value while the item is underlined. The item and the argument value
are displayed in the previous screen.
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 "
4)VLE
" as an example :
2)Base-n
2)Base-n " is shown, then enter the desired mode by
pressing [ ENTER ].
the mode immediately.
Selecting an item from display menus
cursor [ W ] or [ X ] to an item you want. Press
[ ENTER ] while the item is underlined.
Using " 2nd " Keys
Cursor
5)QE
".
0) MAIN
", "
1)STAT
", "
" indicator.
2nd
2)Base-n
2nd
",
"
E – 5
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
To clear all characters, clear all input character by [ CL ] key.
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 [ 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.
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 [ 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
When 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
E – 6
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