Citizen SRP-145N User manual

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BASIC DEFINITIONS.......................................................... 2
The Keys .......................................................................................2
GENERAL KEYS ..............................................................................2
MEMORY KEYS ...............................................................................2
SPECIAL KEYS ................................................................................3
FUNCTION KEYS.............................................................................4
PROGRAMMING KEYS (USE IN THE PGM MODE ONLY) ............5
STATISTICAL KEYS (USE IN THE STAT MODE ONLY).................5
THE DISPLAY..................................................................... 6
ORDER OF OPERATIONS................................................. 7
ACCURACY AND CAPACITY............................................ 7
OVERFLOW / ERROR CONDITIONS ................................ 8
POWER SUPPLY................................................................ 9
NORMAL CALCULATIONS ............................................... 9
Basic Calculation (Including Parenthesis Calculations)................9
Constant Calculations....................................................................9
Memory Calculations...................................................................10
FUNCTION CALCULATIONS........................................... 10
Sexagesimal ↔Decimal conversion ...........................................10
Fraction Calculation.....................................................................11
Trigonometric / Inverse – Tri. Functions ......................................11
Hyperbolic Functions and Inverse – Hyp. Functions ...................11
Common And Natural Logarithms / Exponentiations...................12
Power, Root, Reciprocals, Factorials...........................................12
STANDARD DEVIATIONS ............................................... 12
PROGRAMMING .............................................................. 13
Contents

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BASIC DEFINITIONS
The Keys
To keep your calculators as compact as possible, some keys have
more than one function. You can change the function of a key by
pressing another key first, or by setting the calculator in a certain
mode.
The following pages give you more detailed explanation of each key’s
use and function.
[ 2ndF ] Second Function Select Key
Some keys have a second function inscribed above them. To perform
this second function, press [ 2ndF ]. “ 2F ” appears in the display then
press the key.
GENERAL KEYS
[ 0 ] ~[ 9 ] [‧] Data Entry keys
Press these keys in their logical sequence to enter numbers.
[ + ] [ – ] [ x ] [ ÷ ] [ = ] Basic Calculation Keys
Press these keys in their logical sequence for addition, subtraction,
multiplication, division, and to display answers.
[ ON/C ] Power On / Clear Key
Press [ ON/C ] to turn on the calculator and to clear everything except
the contents of the memory, constant memory(Ka, Kb), and program
memory.
[ CE ] Clear Entry Key
Press [ CE ] to erase incorrect entries.
[ 00Æ0 ] Right Shift Key
Press to clear the last significant digit of the number displayed.
(Ex.) 123456 123456.
[ 00Æ0 ] 12345.
[ 00Æ0 ] 1234.
[ +/– ] Sign Change Key
Press [ +/– ] to change the displayed number from positive to negative
or from negative to positive.
MEMORY KEYS
[ MR ] Memory Recall Key
Press [ MR ] to display the contents of the memory.
[ XÆM ] Memory Store Key
Press [ XÆM ] to store the displayed value into memory. Any previous
value in memory is automatically erased.

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[ M+ ] Memory Plus Key
Press [ M+ ] to total the current calculation and add the result to the
value already in memory.
[ 2ndF ] [ Ka
x
Æ
k
], [ 2ndF ] [ Kb
x
Æ
k
] Constant (Ka, Kb) Memory
Store Key
Press to enter the displayed value into constant memory Ka or Kb.
[ Ka
x
Æ
k
], [ Kb
x
Æ
k
] Memory Recall Key
Press to display the contents of a constant memory.
Note :
•Constant memories Ka and Kb can have a value of 0
•If you press [ Ka
x
Æ
k
] or [ Kb
x
Æ
k
] after entering a number or marking
a calculation, the displayed value is multiplied by the value in Ka or
Kb.
SPECIAL KEYS
[ ( ], [ ) ] Parenthesis Keys
Press to override the calculation’s default order of operation by using
parentheses. You can use up to 6 levels of parenthes in a single
calculation.
[ EXP ] Exponent Key
To enter a number in scientific notation, first enter the numbers for the
mantissa, press [ EXP ], and then enter the numbers for the exponent.
[ 2ndF ] [ π] Key
Press [ 2ndF ] [π] to display the value of π, which is the ratio of
circle’s circumference to its diameter (approximately 3.141592654).
[ 2ndF ] [ X↔Y ] Register Exchange Key
Press [ 2ndF ] [ X↔Y ] to exchange the displayed value (X–register)
with the contents of the working register (Y–register).
(Ex.) 123 [ + ] 456 [ = ] 579.
[ 2ndF ] [ X↔Y ] 456.
[ 2ndF ] [ X↔Y ] 579.
[ 2ndF ] [ FIX ] Decimal Point Set Key
Use to set the number of digits displayed after the decimal point in
either final or intermediate results. The calculator continues to use its
full range for internal calculations and only rounds the number in the
display.
•[ 2ndF ] [ FIX ] [ 0 ]~[ 6 ] –– Sets the number of digits to be
displayed to the right of decimal point.
•[ 2ndF ] [ FIX ] [ 7 ], [ 8 ], [ 9 ], [‧] –– Selects floating point format.
(Ex.) 5 [ ÷] 9 [ = ] 0.555555556
[ 2ndF ] [ FIX ] [ 2 ] 0.56
[ 2ndF ] [ FIX ] [ 5 ] 0.55556

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[ 2ndF ] [ FIX ] [ ‧] 0. 555555556
Note : [ 2ndF ] [ FIX ] is inactive immediately after and during
numerical input.
[ SCI ] Scientific Key
Converts the displayed number into a power of ten and back.
(Ex.) : 12.3456 [ x ] 10 [ = ] 123.456
[ SCI ] 1.23456 02
[ SCI ] 123.456
[ SCI ] 1.23456 02
[ DRG ] Angle unit conversion key
Press to change the angle unit as DEG (Degrees), RAD (Radian), or
GRAD (Gradient).
FUNCTION KEYS
[ 2ndF ] [ ], [ 2ndF ] [ ] Sexagesimal Notation / Decimal
Notation Conversion Keys
To change from sexagesimal (base 60) notation (degree, minute,
second) to decimal notation (degree) press [ 2ndF ] [ ]. To
change from decimal notation to sexagesimal notation, enter the
number in decimal form and then press [ 2ndF ] [ ].
[ sin ], [ cos ], [ tan ] Sine, Cosine, Tangent Keys
Calculate the trigonometric functions of the displayed value.
[ 2ndF ] [ sin –1 ], [ 2ndF ] [ cos–1 ], [ 2ndF ] [ tan–1 ] Inverse Sine,
Inverse Cosine, Inverse Tangent Keys
Calculate the inverse trigonometric functions of the displayed value.
[ 2ndF ] [ HYP ] [ sin ], [ 2ndF ] [ HYP ] [ cos ], [ 2ndF ] [ HYP ]
[ tan ] Hyperbolic Keys
Calculate the hyperbolic functions of the displayed value.
[ 2ndF ] [ HYP ] [ 2ndF ] [ sin–1 ], [ 2ndF ] [ HYP ] [ 2ndF ]
[ cos–1 ], [ 2ndF ] [ HYP ] [ 2ndF ] [ tan–1 ] Inverse Hyperbolic Keys
Calculate inverse hyperbolic functions of the displayed value.
[ log ], [ 2ndF ] [ 10
x
] Common Logarithm And Common
Antilogarithm Keys
Calculate the common logarithm of the displayed value. To calculate
the common antilogarithm of the displayed value, press [ 2ndF ] [ 10 x ].
[ ln ], [ 2ndF ] [ ex ] Natural Logarithm And Natural Antilogarithm
Keys
To calculate the neutral logarithm of the displayed value, press [ ln ].
To calculate the natural antilogarithm of the displayed value, press
[ 2ndF ] [ e
x
].

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[ √], [ x 2 ] Square Root And Square Keys
Press [ √] to find the square root of the displayed value. To square
the displayed value, press [ x 2 ].
[ 2ndF ] [ 3√] Cubic Root Key
Press [ 2ndF ] [ 3√] to find the cubic root of the displayed value.
[ 2ndF ] [ 1/x ] Reciprocal Key
Press [ 2ndF ] [ 1/x ] to calculate the reciprocal of the displayed value.
[ 2ndF ] [ x! ] Factorial Key
To find the factorial of the displayed value, press [ 2ndF ] [ x! ]
[ x y] Power Key
Press any number [ x ],[ x y ], any number [ y ], and [ = ] raise x to the y
power.
[ 2ndF ] [ yx ] Root Key
Press any number [ x ] [ 2ndF ] [ yx ], any number [ y ], and [ = ] to
display the yth root of x.
[ c
b
a ], [ 2ndF ] [ e
d
→] Fraction key
Pressing by [ c
b
a ] can enter a fraction or convert a fraction to a
decimal number. Pressing by [ 2ndF ] [ e
d
→] can convert a mixed
number to an improper fraction and vice versa.
PROGRAMMING KEYS (USE IN THE PGM MODE ONLY)
[ 2ndF ] [ PGM ]─Program Mode Set and Clear Key
Set the calculator to the learn program mode. PGM appears on the
display and the previous contents of program memory are cleared.
When you finish entering the program, press [ 2ndF ] [ PGM ]. The
program you just entered is stored in the program memory. PGM
disappears and the calculator exits the program mode.
[ RUN ]─Compute Key
Runs the recorded program.
[ 2ndF ] [ [X] ]─Specify Variable Key
Lets you have the calculator wait for an entry during a program.
[ 2ndF ] [ HALT ]─Temporarily Halt Calculation Key
Temporarily halts a program so you can view the intermediate results
or interrupt calculation.
STATISTICAL KEYS (USE IN THE STAT MODE ONLY)
[ 2ndF ] [ SD ] Statistical Mode Select Key
Sets the calculator to statistical calculation mode. STAT appears in the

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display.
[ 2ndF ] [ CAD ] Statistical Register Clear Key
Clears the statistical calculation registers.
[ DATA ], [ DEL ] Data Entry and Delete Key
In the STAT mode, enter data by pressing the desired numbers, then
[ DATA ]. If you enter incorrect data and do not notice your mistake
until you press [ DATA ], enter the same incorrect data and then press
[ DEL ] to delete that incorrect data.
[ x] Arithmetic Mean Key
Calculates the arithmetic mean ( x) of the data.
[ 2ndF ] [σn] Population Standard Deviation Key
Calculates the population standard deviation of the data.
[σn–1] Sample Standard Deviation Key
Calculates the sample standard deviation of the data.
[ 2ndF ] [Σx 2 ] Sum of Square Value Key
Calculates the sum of the square value (Σx 2) of the data.
[ 2ndF ] [ Σx ] Sum of Value Key
Calculates the sum of the value (Σx ) of the data.
[ n ] Number of Data Key
Displays the number of data (n) entries.
The Display
Indicators showed on the display to indicate you the current status of
the calculator.
•Floating point displays up to 10 digits.
•The mantissa section displays up to 8 digits. the exponent section
displays up to ±99.
SD : Indicates the statistical mode.
M : Indicates that a value is stored in memory.
– : Appears to the left of the mantissa or exponent to
indicate that the respective value is negative.
E : Indicates an error.
PGM : Indicates the program learn mode.
GRAD : Indicates the gradient units have been selected.
RAD : Indicates that radian units have been selected.
DEG : indicates that degree units have been selected.
2F : Appears when the second function has been
selected.
HYP : Appears when the hyperbolic function has been
selected.

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( : Appears when you press [ ( ]. It shows the
present level of nesting.
( n ) : Appears when you press [SHIFT] [[X]] in the
program learn mode and when program
execution halts to let you enter a variable. The
number in brackets shows the number of the
place of the variable, and goes from 1 - 40.
ORDER OF OPERATIONS
Each calculation is performed in the following order of precedence:
1) Functions required inputting values before pressing the function
key, for example, cos, sin, tan, cos –1, sin –1, tan –1, log, ln, x 2, 1/x,
√, π, 3, x!, %, , .
2) Operation in parenthesis
3) Functions required pressing the function key before entering, for
example, [ EXP ] key .
4) Fractions
5) +/–
6) y x , x y
7) x ,
÷
8) +, –
ACCURACY AND CAPACITY
Functions Input range
sin x, cos x, tan x Deg : x <1 x 10 11 deg
Rad : x <1745329252 rad
Grad : x <1.111111111 x 10 11 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

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log x, ln x 1 x 10 –99 ≤x <1 x 10 100
10 xx <100
ex x ≤230.2585092
x0 ≤x <1 x 10100
x 2x <1 x 10 50
1/x 1 x 10 –99 ≤x <1 x 10 100 , x ≠0
3xx <1 x 10 100
x ! 0 ≤x ≤69, x is an integer.
, x <1 x 10 100
x yx >0 : –1 x 10100 <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
yxx >0 : y ≠0, –1 x 10100 <y
1 log x <100
x = 0 : y >0
x<0 : y=2n+1, l/n, n is an integer.(n≠0)
but –1 x 10100 <y
1 log ⏐x⏐100
a b/cInput：Total of integer, numerator and
denominator must be within 10 digits (includes
division marks)
Result：Result displayed as fraction for
integer when integer, numerator and
denominator are less than 1 x 10 10
STAT ⏐x ⏐<1 x 10 50 , ⏐Σ x ⏐<1 x 10 100
0 ≤Σx 2 <1 x 10100, 0 ≤n <1 x 10 100
x
: n ≠0 ; σn–1 : n >1 ; σn: n >0
OVERFLOW / ERROR CONDITIONS
A symbol “ E ” is indicated on the display when any of the following
conditions occur and further calculation becomes impossible. Just
press [ ON/C ] to release those overflow or error indicator and the
subsequent calculation can then be performed.
•An intermediate or final calculation result exceed 1 x 10 100
(including memory calculations).
•You try to divide by zero.
•The number of low priority storage levels exceeds 6 in a
parentheses calculation or nesting parentheses exceed 7 in one
level. (Even if the number of levels is within 6, an error might occur
if you are using memories Ka or Kb, or program memories.)

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•You try to use [ 2ndF ] [ Ka xÆk ] or [ 2ndF ] [ Kb xÆk ] while memories
Ka and Kb are being used for low–priority calculation storage.
•You make a calculation that is out of the range for functional and
statistical calculations.
•You try to store over 40 steps in a program.
To clear calculation after an overflow condition, press [ ON/C ].
POWER SUPPLY
To turn the calculator on, press [ ON/C ] ; To turn the calculator off,
press [ OFF ]. This calculator automatically turns it off when not
operated for approximately 9 minutes. It can be reactivated by
pressing [ ON/C ] key and the display, memory, settings are retained.
The calculator is powered by two alkaline batteries (G13 or LR44).
When the display dims, replace the batteries. Be careful not to be
injured when you replace the battery.
1. Unscrew the screws on the back of the calculator.
2. Insert a flat bladed screwdriver into the slot between the upper and
lower case then carefully twist it to separate the case.
3. Remove both batteries and dispose of them properly. Never allow
children to play with batteries.
4. Wipe off the new batteries with a dry cloth to maintain good contact.
5. Insert the two new batteries with their flat sides (plus terminals) up.
6. Align the upper and lower cases then snap them to close together.
7. Tighten the screws.
NORMAL CALCULATIONS
Basic Calculation
(Including Parenthesis Calculations)
(Ex.) : – 3.5 + 8 ÷2 = 0.5
3.5 [ +/–] [ + ] 8 [ ÷] 2 [ = ] DEG 0.5
(Ex.) : ( 5 – 2 x 1.5 ) x 3 + 0.8 x ( – 4 ) = ?
[ ( ] 5 [ – ] 2 [ x ] 1.5 [ ) ] [ x ] 3 [ + ] 0.8 [ x ]
4 [ +/ – ] [ = ]
DEG 2.8
(Ex.) : 2 x [ 7 + 6 x ( 5 + 4 ) ] = 122
2 [ x ] [ ( ] 7 [ + ] 6 [ x ] [ ( ] 5 [ + ] 4 [ = ] DEG 122.
(Note) : It is unnecessary to press the [ ) ] key before the [ = ] key.
Constant Calculations
(Ex.) : 3 + 2.3 = 5.3
6 + 2.3 = 8.3
3 [ + ] 2.3 [ = ] DEG 5.3
6 [ = ] DEG 8.3