Citizen SR-260 User manual

E-1
Contents
General guide .................................................. E - 2
Power supply ......................................................................... E - 2
The keyboard ......................................................................... E - 2
Display symbols .................................................................... E - 3
Display formats ..................................................................... E - 3
Order of operations................................................................ E - 4
Correction .............................................................................. E - 5
Accuracy and Capacity.......................................................... E - 5
Overflow / Error conditions.................................................... E - 7
Basic calculation ............................................. E - 8
Mixed arithmetic calculation ................................................. E - 8
Parentheses calculations ...................................................... E - 8
Constant calculation .............................................................. E - 8
Percentage calculation .......................................................... E - 9
Memory calculation ............................................................... E - 9
Scientific calculation ..................................... E - 10
Reciprocal, Factorial ........................................................... E - 10
Square, Square / Cubic Root, Power, Root ........................ E - 10
Logarithms and Antilogarithms ........................................... E - 10
Fraction calculation ............................................................. E - 10
Angular units conversion..................................................... E - 11
Trigonometric / Inverse trigonometric functions ................. E - 11
Hyperbolic / Inverse hyperbolic functions ........................... E - 12
Rectangular / Polar coordinates.......................................... E - 12
Permutations, Combinations .............................................. E - 12
Sexagesimal ↔Decimal form conversion ......................... E - 13
Base-n mode calculation .................................................... E - 13
Complex numbers calculation ............................................ E - 14
Random numbers and Exchange key................................. E - 14
Unit conversion.................................................................... E - 15
Statistics calculation ..................................... E - 15
Computing single variable statistics ................................... E - 15
Viewing statistics data ........................................................ E - 16
Adding a data entry ............................................................. E - 17
Editing statistics data .......................................................... E - 17
Delete error .......................................................................... E - 18
Weighted data entry method ............................................... E - 18

E-2
General guide
Power supply
On or Off :
Toturnthecalculatoron,press[ON/C];toturnthecalculatoroff,press
[2ndF][OFF].
Auto power-off function :
This calculator automatically turns off it when not operated for
approximately9minutes.Powercanberestored by pressing the [ON/C]
keyagain. Memorycontentsandthepreviousmode setting(STAT,DEG,
CPLX, Base-n,…) are retained even when power is turned off or auto
power-off.
Battery replacement :
The calculator uses two alkaline button batteries GP76A(LR44) for
power.Ifthedisplaybecomesdimanddifficulttoread,thebatteriesshould
bereplaced as soon aspossible.
Toreplace batteries:
1) Removethescrews that hold thebackcover.
2) Removethebackcover.
3) Replacetheoldbatteriesandinstallnewoneswithpolarityincorrect
directions.
4) Securethescrewsinplace,thenpress[ON/C]toturnthepoweron.
The keyboard
Manyofthecalculator’skeysareusedtoperformmorethanonefunction.
Thefunctionsmarkedonthekeyboardareprinteddifferentlytohelpyoufind
theoneyouneedquicklyandeasily.
1st functions
Thosearethefunctionsthatarenormallyexecutedwhenyoupressthekey.
2nd functions
Thesecondfunctionisprintedaboveortotherightofthekey.Toexecute
2ndfunctionskey,pleasepress[2ndF]thenthecorrespondingkey.When
youpress[2ndF ], the “2ndF”indicatorshowninthe display is totellyou
thatyouwillbeselectingthesecondfunctionofthenextkeyyoupress.Ifyou
press[2ndF]bymistake,simplypress[2ndF]againtoremovethe“2ndF
” indicator.
sin
sin –1
1st functions
2nd functions

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(Note) : [ A ], [ B ], [ C ], [ D ], [ E ], [ F ] are 1st functions in HEX mode.
Display symbols
Indicatorsshownonthedisplayisto indicate you the current status
ofthecalculator.
DEG or RAD or GRAD : angular unit
M : Independentmemory CPLX :Complexnumbermode
E: Overflow / Error STAT: Statisticalmode
–: minus 2ndF: [2ndF]keypressed
( ) : Parenthesiscalculation CP : Precisioncapability
BIN: Binarymode CPK: Processcapability
OCT : Octalmode : Deviation
HEX : Hexadecimalmode USL: Setting upper limit
ED : Editmode LSL: Setting lower limit
HYP: Hyperbolicmode
Display formats
Thecalculatorcandisplaynumbersinfourformats:floatingpoint,fixed
point, scientific, and engineering.
Floating point display format
Thefloating point format displaysnumbers in decimal form, usingup
to 10 digits. Any trailing zeros are truncated.
If the result of a calculation is too large to be represented in 10 digits,
thedisplayautomaticallyswitchestoscientificformat. Iftheresultoflater
calculations is small enough to be displayed in 10 digits, the calculator
returns to floating point format.
(Ex.) : Set the display in floating display format.
Step : Press [ 2ndF ] [TAB ] [ • ] DEG 0.
Fixed point display format
Thefixedpoint,scientific,andengineeringformatsuseafixednumber
ofdecimalplacestodisplaynumbers.Ifmorethantheselectednumberof
decimalplacesiskeyed,itwillberoundedtothecorrectnumberofdecimal
places.
(Ex.):Fixthedisplay at 2 decimal places, thenkeyin3.256
Step 1 : press [ 2ndF ] [TAB ] 2 DEG 0.00
Step 2 : key in 3.256 [ = ] DEG 3.26

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Onthecontrary,if fewer than the selected numberofdecimalplaces
is keyed, it will be padded with trailing zero.
(Ex.):Fixthedisplayat4decimalplaces,thenkeyin4.23
Step 1 : press [ 2ndF ] [TAB ] 4 DEG 0.0000
Step 2 : key in 4.23 [ = ] DEG 4.2300
Scientific display format
InScientificdisplayformat,thenumber891500canbe showninscientific
formatas8.915x1005,where8.915iscalledthemantissaand5isasthe
exponentof10.
(Ex.): 7132 x 125is displayed in scientific displayformat.
Step 1 : key in 7132 [ x ] 125 [ = ] DEG 891500.
Step 2 : press [ F↔E ] DEG 8.915 05
(in floating point format)
Besides, entry can be made in scientific notation by using the [EXP]
keyafterenteringthemantissa.
(Ex.):Keythenumber4.82296x105
Step:key in 4.82296 [EXP]5 DEG 4.82296 05
(in floating point format)
Engineering display format
The format is similar to the scientific format, expect the mantissa can
have up to three digits left of the decimal, instead of only one, and the
exponentisalwaysamultipleofthree.Itisusefulforengineerstoconvert
units based on multiplesof 10 3.
(Ex.) : Convert 15V into 15000mV (V : Volt)
Step1:keyin15 DEG 15.
Step 2 : press [ ENG ] twice DEG 15000.– 03
(Ex.) : Convert 15V into 0. 015KV (V : Volt)
Step1:keyin15 DEG 15.
Step 2 : press [ 2ndF ] [ ] twice DEG 0.015 03
Order of operations
Each calculation is performed in the following order of precedence :
1) Operationinparenthesis
2) Functions required pressing the function key before entering, for
example, [DATA] in STATmode and [ EXP] key .
3) Functionsrequiredinputingvaluesbeforepressingthefunctionkey,
forexample, cos, sin, tan, cos–1, sin–1, tan–1, log, ln, X 2,1/x, , ,
, X!, %, RND, ENG, , ,,,, ,, , and 6 units conversion.
4) Fractions

E-5
5) +/–
6) X y,
7) nPr, nCr
8) x , ÷
9) +, –
Correction
Ifyouhavemadeamistakewhenenteringanumber(butyouhavenotyet
pressedanarithmeticoperatorkey),justpress[CE]toclearthelastentry
theninputitagain,or delete individual digits by using the backspace key
[ 00 0 ]
(Ex.) : Correct 12385 as 789
Step : press [ CE ] 789 DEG 789.
(Ex.) : Correct 12385 as 123
Step : press [ 00 0 ] twice DEG 123.
Ina seriesofcalculations,youcancorrecterrors inimmediateresults
by pressing [ON/C] to clear the calculation completely (expect clearing
memory,seepage9).
Ifyou press thewrong arithmetic operation key, justpress [ CE] key
beforeenteringanythingelse.
Accuracy and Capacity
Accuracy : 1 in 10th digit.
Capacity:
In general, every reasonable calculation is displayed up to 10 digit
mantissa,or10-digitmantissaplus2-digitexponentupto10 99orintegers
between–9999999999and9999999999.
Numbersused as input mustbe within the rangeof the given
function. The range for each of the calculator’s functions is given in the
following pages.
Functions Inputrange
sinx,cos x, tan x Deg X4.5 x 10 10 deg
Rad X2.5 x 10 8rad
Grad X5 x 10 10 grad
however,fortanx
Deg X90 (2n+1)
Rad X(2n+1)
Grad X100 (2n+1)
(n is an integer)
X
y
π
2

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sin –1 x, cos –1 x X≤ 1
tan–1x X1 x 10 100
sinhx,coshx X≤ 230.2585092
tanhx X1 x 10 100
sinh –1 x X5 x 10 99
cosh –1 x1≤X 5 x 10 99
tanh–1 x x 1
log x, ln x 1 x 10 –99 ≤X 1 x 10 100
10x–1 x 10 100 X100
ex–1x10100 X≤230.2585092
0≤X 1 x 10 100
x2X1 x 10 50
1/X X1 x 10 100, X 0
X1 x 10 100
X ! 0 ≤X ≤69 , X is an integer.
RP1 x 10 100
PR0≤r1 x 10 100
Deg 4.5 x 10 10 deg
Rad 2.5 x 10 8rad
Grad 5 x 10 10 grad
however,fortanx
Deg 90 (2n+1)
Rad (2n+1)
Grad 100 (2n+1)
(n is an integer)
, ,, DD , MM, SS.SS 1 x 10 100,
0≤MM, SS.SS
, ,, x1 x 10 100
XyX0–1 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 10 100 log X100
X0y 0, –1 x 10 100 log X 100
X = 0 y 0
X0y = 2n+1, I/n, n is an integer.(n 0)
but – 1 x 10 100 log X100
2
X2+Y2
X
3X
yXy
1
y
1
y
1

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Input Total of integer,numerator and
denominatormust bewithin10digits
(includesdivisionmarks)
Result Result displayed as fraction for
integerwhen integer,numeratorand
denominatorarelessthan1 x 10 10
nPr, nCr 0 rn, n 9999999999, n,r are integers.
STAT x1x10 50 x1 x 10 100
0≤ x21 x 10 100, n, r are integer
_
xn 0 S n 1 n 0
Range = 1 ~ r, 1 ≤n≤r, 80 ≤r≤20400
DEC 0 ≤X≤9999999999 (for zero or positive )
– 9999999999 ≤X≤– 1 (for negative)
BIN 0 ≤X≤0111111111(forzero,positive)
1000000000 ≤X≤1111111111
(for negative)
OCT 0 ≤X≤3777777777 (for zero or positive)
4000000000 ≤X≤7777777777
(for negative)
HEX 0≤X≤2540BE3FF( for zero or positive)
FDABF41C01 ≤X≤FFFFFFFFFF
(for negative)
Overflow / Error conditions
A symbol “ E ” are indicated on the display when any of the following
conditionsoccurandfurthercalculationbecomesimpossible.Justpress
[ ON/C ] to release those overflow or error indicator and the subsequent
calculationcanthenbeperformed.
1) Whenfunctioncalculationsareperformedwithanumberexceeding
theinputrange.
2) Whenanumberisdividedby0.
3) Whenthe[(]keyisusedmorethan 15timesinasingleexpression.
4) Whenaresult(whetherintermediateorfinal)oraccumulatedtotalin
memoryexceeds the limit. ( 9.999999999 x 10 99)
5) Whenmorethansixpendingoperations.
Basic calculation
Before performing the following calculation, check to see that your
calculator is in decimal base and floating point display.
ab/c

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Mixed arithmetic calculation
1 + 2 x 3 = ? 1 [ + ] 2 [ x ] 3 [ = ] DEG 7.
– 3.5 + 8 ÷ 2 = ? 3.5 [ +/– ] [ + ] 8 [ ÷ ] 2 [ = ] DEG 0.5
Parentheses calculations
Operationinsideparenthesesarealwaysexecutedfirst.Youcanuseup
to15levelsofparenthesesinasinglecalculation.Whenthefirstparenthesis
isopened,the“( ) ” indicator appears and remainsinthedisplayuntilthe
last parenthesis is closed.
( 5 – 2 x 1.5 ) x 3 [ ( ] 5 [ – ] 2 [ x ] 1.5 [ ) ] [ x ] DEG 2.8
+ 0.8 x ( – 4 ) = ? 3 [ + ] 0.8 [ x ] 4 [ +/– ] [ = ]
2 x { 7 + 6 x ( 5 + 4 ) } 2 [ x ] [ ( ] 7 [ + ] 6 [ x ] DEG 122.
= ? [ ( ] 5 [ + ] 4 [ = ]
(Note) : It is unnecessary to press the [ ) ] key before the [ = ] key.
Constant calculation
Thecalculatorenablesyou to repeat the last numberenteredorthe
lastoperationexecuted by pressing [=]key.
Repeating the last number
3 x 3= ? 3 [ x ] [ = ] DEG 9.
3 x 3 x 3 = ? [ = ] DEG 27.
3 x 3 x 3 x 3 = ? [ = ] DEG 81.
Repeating the arithmetic operation
321 + 357= ? 321 [ + ] 357 [ = ] DEG 678.
654 + 357= ? 654 [ = ] DEG 1011.
579 – 159 = ? 579 [ – ] 159 [ = ] DEG 420.
456 – 159 =? 456 [ = ] DEG 297.
18x45= ? 3 [ x ] 6 [ x ] 45 [ = ] DEG 810.
18x23=? 23 [ = ] DEG 414.
18 x (0.5 x 10 2) = ? 0.5 [ EXP ] 2 [ = ] DEG 900.

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96 ÷8=? 96 [ ÷ ] 8 [ = ] DEG 12.
75 ÷8=? 75 [ = ] DEG 9.375
(1.2 x 10 2)÷8 =? 1.2 [ EXP ] 2 [ = ] DEG 15.
Percentage calculation
30% of 120 = ? 120 [ x ] 30 [ 2ndF ] [ % ] DEG 36.
[ = ]
70% of 120= ? 70 [ 2ndF ] [ % ] [ = ] DEG 84.
88 is 55%of 88 [ ÷ ] 55 [ 2ndF ] [ % ] DEG 160.
whatnumber =? [ = ]
30%add-onof120 120 [ + ] 30 [ 2ndF ] [ % ] DEG 156.
= ? [ = ]
30%discountof120 120 [ – ] 30 [ 2ndF ] [ % ] DEG 84.
= ? [ = ]
Memory calculation
Youshouldkeepthefollowingrulesinmindwhenperformingmemory
calculations.
1) The“M”indicatorappearswhenanumberisstoredinthememory.
2) Recalling from a memory by pressing [ MR ] key does not affect its
contents.
3) AllmemoriesareunavailableunderSTATmode.
4) Inordertoexchange thecontentofthememoryforthe
displayed number, please press [X M] key.
5) The contents of the memories can be cleared by pressing [ 0 ]
[X M] or [ CE ] [X M] in sequence.
[ CE ] [X M] DEG 0.
3 x 5 3 [ x ] 5 [ M+ ] M DEG 15.
+) 56 ÷ 7 56 [ ÷ ] 7 [ M+ ] M DEG 8.
+) 74 – 8 x 7 74 [ – ] 8 [ x ] 7 [ M+ ] M DEG 18.
Total = ? [ MR ] M DEG 41.
0 [X M] DEG 0.
Scientific calculation
Beforeperformingthefollowing calculation, check to see that your
calculatorisfixed at 2 decimal placesdisplayformat.

E-10
5
3
15
124
15
4
9
44 3
36
7
Reciprocal, Factorial
= ? 1.25 [ 2ndF ] [1/X] [ = ] DEG 0.80
5! = ? 5 [ 2ndF ] [ X! ] [ = ] DEG 120.00
Square, Square / Cubic Root, Power, Root
22+ 3 4= ? 2 [ X 2] [ + ] 3 [ X y] 4 [ = ] DEG 85.00
5 x + 5 [ x ] 27 [ 2ndF ] [ 3] DEG 20.83
= ? [ + ] 34 [ ] [ = ]
= ? 72 [ 2ndF ] [ ] 9 [ = ] DEG 1.61
Logarithms and Antilogarithms
ln7 + log100 = ? 7 [ ln ] [ + ] 100 [ log ] [ = ] DEG 3.95
10 2= ? 2 [ 2ndF ] [ 10 x] [ = ] DEG 100.00
e5– e – 2 = ? 5 [ 2ndF ] [ e x] [ – ] DEG 148.28
2 [ +/– ] [ 2ndF ] [ e x] [ = ]
Fraction calculation
Fraction value display is as follow :
(Note) : Totalofinteger,numerator anddenominatormustbewithin 10
digits,orthe fractional valuecouldn’tbeshowncompletely.
Bypressing[2ndF][ d/e],thedisplayedvaluewillbeconvertedtothe
improperfraction.
+ 7 2 [a b/c ] 3 [ + ] DEG84 15
= 8 7 [ab/c ] 3 [a b/c ] 5 [ = ]
= [ 2ndF ] [ d/e ] DEG 124 15
When apressof[ab/c]keyafterthe [=]keyor afraction performed
with a decimal, the answeris displayed as a decimal.
5 + 3 5 [a b/c ] 4 [a b/c ] 9 DEG 9 736
= 9 [+] 3 [a b/c ] 3 [a b/c ] 4 [ = ]
= 9.19 [ab/c ] DEG 9.19
512 Display of 12
5
56 512 Display of 56 12
5
3
2
1.25
1
X
y
27
3
72
9
34