Citizen SRP-280N User manual

SRP-280N/SRP-285N
HDBSR285T19 (SR285,A)
2010/04/26 140X75mm
SR285,A COVER front

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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
General Guide .................................................3
Turning On And Off.........................................3
Battery Replacement ......................................3
Auto Power-Off Function................................3
Reset Operation..............................................3
Contrast Adjustment.......................................4
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
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

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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
Unit Conversions..........................................15
Physical 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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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
General Guide
Turning On And Off
To turn the calculator on, press [ ON ] ; To turn the calculator off,
press [ 2nd ] [ OFF ].
Battery Replacement
SRP-280N is powered by one alkaline battery (G13/LR44).
SRP-285N is dual power system which is powered by one alkaline
battery (G13/LR44) and a solar cell. If the display becomes dim and
difficult to read (especially when lighting is dim for SRP-285N), the
battery should be replaced as soon as possible.
To replace battery :
1) Remove the screw and the battery compartment cover.
2) Remove the old battery and insert a new one with polarity in
correct directions, then replace the cover.
3) After changing battery, please use a pointed object to press the
reset hole in the rating label area located at the rear of this unit.
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 use a pointed object to press the reset hole to
release the condition. It will return all settings to default settings.

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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
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.
Display Readout
The display comprises the entry line, the result line, and indicators.
MA IN
74 – 8 / 7
72.85714286

Entry line
Indicator
Result line
Indicator DEG
Entry line The calculator 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.
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
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

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File name : CBM_SR285,A_HDBSR285T19_English.doc
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There are digits to the left or right of the display
There are earlier or later results that can be displayed
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
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
zThis 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.
zThe replay function can keep input digits up to 254 characters.
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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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
zThe calculator has ten memory variables for repeated use : A, B,
C, X, Y, M, X1, X2, PROG1
and
PROG2
. You can store a real
number in variables A, B, C, X, Y, M, X1, X2 and an expression in
PROG1
and
PROG2
. 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
PROG1
,
PROG2
.
* [ 2nd ] [ CL-PROG ] clears the contents of
PROG1
,
PROG2
.
(Note) : Besides pressing [ SAVE ] key to store a value, you can
also assign values to memory variable Mby [ M+ ] or
[ 2nd ] [ M– ]. However, anything currently stored in
variable Mwill be deleted and replaced by the newly
assigned value.
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,
RANDM, RANDMI.
7) ( – )
8) Abbreviated multiplication format in the 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/cd/e, F D, DMS )
• When functions with the same priority are used in series,
execution is performed from right to left.
e
Xln120 Æe X{ ln (120 ) }
otherwise, execution is from left to right.

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• Compound functions are executed from right to left.
• Anything contained within parentheses receives the
highest priority.
Accuracy And Capacity
Output digits : Up to 10 digits
Calculating digits : Up to 24 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
x2 x <1 x 10 50
x -1 x <1 x 10 100, x ≠0
x ! 0 ≤x ≤69, x is an integer.

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File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
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 tanθ
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 <10 100
x yx >0 : –1 x 10 100 <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
xy
y >0 : x ≠0, –1 x 10 100 <x
1 log y
<100
y = 0 : x >0
y <0 : x = 2n+1, 1/n, n is an integer. (n≠0)
but –1 x 10 100 <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
1–VAR : n ≤40, 2–VAR : n ≤40
FREQ. = n, 0 ≤n <10 100 : n is an integer in
1–VAR mode.
σx,σy,
x
,y,a, b, r : n≠0 ;
Sx, Sy：n, n≠0, 1