Citizen SRP-145T 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 SD mode only) ............................. 6
The Display.............................................................................. 6
OVERFLOW OR ERROR CHECK .......................... 7
REPLACING THE BATTERIES............................................... 7
BASIC OPERATION ............................................... 8
TURNING ON THE CALCULATOR ........................................ 8
Normal Calculations ................................................................ 8
Four Basic Calculations (Including Parenthesis Calculations) 8
Constant Calculations.............................................................. 9
Memory Calculations ............................................................. 11
Function Calculations ......................................... 12
Sexagesimal ↔Decimal Conversion .................................... 12
Trigonometric/Inverse Trigonometric Functions .................... 12
Hyperbolic Functions and Inverse Hyperbolic Functions ...... 13
Common and Natural Logarithms/Exponentiations............... 14
Square Roots, Cube Roots, Squares, Reciprocals, and
Factorials ............................................................................... 16
STANDARD DEVIATIONS.................................... 18
PROGRAMMING................................................... 19
Storing Mathematical Procedures ......................................... 19
SRP-145T
Scientific Calculator

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BASIC DEFINITIONS
The Keys
To keep your calculator 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
[SHIFT] Second Function Select Key
Some keys have a second function inscribed above them (for example,
1/x is above x2). To perform this second function, press [SHIFT]. "2F"
appears in the display. Then press the key.
Example: To calculate the reciprocal of 5, press [5] [SHIFT] [1/x]. The
display shows 0.2. In this manual, we refer to the key by the desired
function. So, the example would be shown as [5] [SHIFT] [1/x].
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. It also overrides the auto power-off function.
[CE] Clear Entry Key
Press [CE] to erase incorrect entries.
[+/−] Sign Change Key
Press [+/−] to change the displayed number from positive to negative
or from negative to positive. If you press [+/−] after pressing [EXP], the
sign of the exponent changes.
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.
[M+] Memory Plus Key
Press [M+] to total the current calculation and add the result to the
value already in memory.

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[SHIFT] [KaxÆk], [SHIFT] [KbxÆk] Constant (Ka, Kb) Memory Store
Key
Press to enter the displayed value into constant memory Ka or Kb.
[KaxÆk], [KbxÆk] Constant (Ka, Kb) Memory Recall Key
Press to display the contents of a constant memory.
Notes:
• Constant memories Ka and Kb can have a value of 0.
• If you press [KaxÆk]or [KbxÆk]after entering a number or making a
calculation, the displayed value is multiplied by the value in Ka or
Kb.
Special Keys
[ ( ], [ ) ] Parenthesis Keys
This calculator uses true algebraic logic. It performs calculations using
the following priority:
1) Functions
2) Calculations in parenthesis
3) Power and root calculations
4) Multiplication and division
5) Addition and subtraction
To change this order, enclose the expressions that must be calculated
first within [ ( ] and [ ) ]. In a single expression, you can use a
maximum of 42 nested parentheses at 6 levels (nesting of up to 7
parentheses in one level).
For example, if you press [−]6[x2] [=], the calculator gives a result of
−36. This might seem incorrect at first, since the square of a negative
number is always positive. However, if you refer to the above priority
sequence, you see that the power ([x2]) has a higher priority than the
minus ([−]). So the calculator sees the entry as “the negative of six
squared.” To make the calculator perform “negative six, squared”
enter [ (] [−]6[ )] [x2] [=]. This forces the calculator to resolve the [−]
6and then square the result.
[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.
[SHIFT] [ π ] Key
Press [SHIFT] [ π ] to display the value of π, which is the ratio of a
circle’s circumference to its diameter (approximately 3.141592654).
[SHIFT] [Æo’ ”], [SHIFT] [o’ ”Æ] Sexagesimal notation/decimal
notation conversion Keys
To change from sexagesimal (base 60) notation (degree, minute,
second) to decimal notation (degree) press [SHIFT] [o’ ”Æ]. To change
from decimal notation to sexagesimal notation, enter the number in
decimal form and then press [SHIFT] [Æo’ ”].

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[SHIFT] [X↔Y] Register Exchange Key
Press [SHIFT] [X↔Y] to exchange the displayed value (X−register)
with the contents of the working register (Y−register).
[SHIFT] [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.
[SHIFT] [FIX] [0] - [6]
Sets the number of digits to be displayed to the right of decimal point.
[SHIFT] [FIX] [7], [8], [9], [ • ]
Selects floating point format.
Note: [SHIFT] [FIX] is inactive immediately after and during numerical
input.
[DRG] Pressing this key will change the mode of angle unit
sequentially
ÆÆÆ DEG RAD GRAD
and display it on LCD.
[OFF] Power off key
Function Keys
[sin], [cos], [tan] Sine, Cosine, Tangent Keys
Calculate the trigonometric functions of the displayed value.
[SHIFT] [sin−1], [SHIFT] [cos−1], [SHIFT] [tan−1]
Arc Sine, Arc Cosine, Arc Tangent Keys
Calculate the inverse trigonometric functions of the displayed value.
[SHIFT] [HYP] [sin], [SHIFT] [HYP] [cos], [SHIFT] [HYP] [tan]
Hyperbolic Keys
Calculate the hyperbolic functions of the displayed value.
[SHIFT] [HYP] [SHIFT] [sin−1], [SHIFT] [HYP] [SHIFT] [cos−1],
[SHIFT] [HYP] [SHIFT] [tan−1]
Inverse Hyperbolic Keys
Calculate inverse hyperbolic functions of the displayed value.
[Log], [SHIFT] [10X] Common Logarithm and Common
Antilogarithm Keys
Calculate the common logarithm of the displayed value. To calculate
the common antilogarithm of the displayed value, press [SHIFT] [10X].
[In], [SHIFT] [eX] Natural Logarithm and Natural Antilogarithm
Keys
To calculate the natural logarithm of the displayed value, press [In]. To
calculate the natural antilogarithm of the displayed value (to raise e
(2.718281828) to x powers), press [SHIFT] [eX].
[], [x2] Square Root and Square Keys

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Press [ ] to find the square root of the displayed value. To square
the displayed value, press [x2].
[SCI] Scientific Key
Converts the displayed number into a power of ten and back.
Example: You Press You See
12.3456 x 10 = 123.456
SCI 1.23456 02
SCI 123.456
SCI 1.23456 02
[SHIFT] [ 3] Cubic Root Key
Press [SHIFT] [ 3] to find the cubic root of the displayed value.
[SHIFT] [1/x] Reciprocal Key
Press [SHIFT] [1/x] to calculate the reciprocal of the displayed value.
[SHIFT] [x!] Factorial Key
To find the factorial of the displayed value, press [SHIFT] [x!].
Example: 4! = 4 x 3 x 2 x 1 = 24
[Xy] Power Key
Press any number [X], [Xy], any number [y], and [=] to raise X to the y
power.
Example: 5 [Xy] 4 [=] 625
[SHIFT] [ yx] Root Key
Press any number [x] [SHIFT] [ yx], any number [y], and [=] to
display the y root x.
Example: 625 [SHIFT] [ yx] 4 [=] 5
Programming Keys (Use in the PGM mode only)
[SHIFT] [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 is cleared.
When you finish entering the program, press [SHIFT] [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.
[SHIFT] [[x]] −Specify Variable Key
Lets you have the calculator wait for an entry during a program.
[SHIFT] [HALT] −Temporarily Halt Calculation Key
Temporarily halts a program so you can view the intermediate results
or interrupt calculations.

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Statistical Keys (Use in the SD mode only)
[SHIFT] [SD] Statistical Mode Select Key
Sets the calculator to the statistical calculation mode. SD appears on
the display.
[SHIFT] [CAD] Statistical Register Clear Key
Clears the statistical calculation registers.
[DATA], [DEL] Data Entry and Delete Key
In the SD 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.
[SHIFT] [σn] Population Standard Deviation Key
Calculates the population standard deviation (σn) of the data.
[σn–1] Sample Standard Deviation Key
Calculates the sample standard deviation (σn–1) of the data.
[SHIFT] [Σx2] Sum of Square Value Key
Calculates the sum of the square value (Σx2) of the data.
[SHIFT] [Σx] Sum of Values 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
The display shows entered numbers, interim results, and calculation
results.
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 that 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.

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HYP : Appears when the hyperbolic function has been selected.
(: Appears when you press [ (]. It shows the present level of
nesting.
( | ) : 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.
OVERFLOW OR ERROR CHECK
An overflow or error is indicated by "E". Stop further calculations.
An overflow or error occurs when:
a) An intermediate or final calculation result exceeds 1 x 10100
(including memory calculations).
b) You try to divide by zero.
c) 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.)
d) You try to use [SHIFT] [KaXÆK] or [SHIFT] [KbXÆK] while memories
Ka and Kb are being used for low-priority calculation storage.
e) You make a calculation that is out of the range for functional and
statistical calculations.
f) You try to store over 40 steps in a program.
To clear calculations after an overflow condition, press [ON/C].
Memory Protection:
Memory contents are protected against overflow or error conditions. If
a memory operation would result in the memory value exceeding
1 x 10100, the calculator displays Eand does not change the value in
memory.
REPLACING THE BATTERIES
Your calculator is powered by two alkaline-manganese batteries.
When the display dims, replace the batteries.
1. Unscrew the two 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 promptly. 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.

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7. Tighten the screws.
BASIC OPERATION
TURNING ON THE CALCULATOR
Press [ON/C] to turn on your calculator. A " 0 " shows on the display. If
you leave your calculator on without making any calculation, it
automatically turns itself off in approximately 10 minutes to save
battery life.
Note: Even when the power is off, the calculator’s memory retains the
contents of the independent memory, constant memory registers, and
any program steps.
Normal Calculations
• The calculator operates using true algebraic logic; calculations can
be performed in the same sequence as the written formula.
• You can nest up to 42 parentheses at 6 levels, with up to 7
parentheses in one level.
Four Basic Calculations (Including Parenthesis
Calculations)
Example: 7 x 8 −4 x 5 (= 56 −20) = 36
Press Display Comment
[7] DEG
7. Enter value
[x] DEG
7. Enter operation
[8] DEG
8.
Enter value to
operate by
[−]DEG
56.
Enter operation,
show result
[4] DEG
4.
Enter value to
operate by
[x] DEG
4. Enter operation
[5] DEG
5.
Enter value to
operate by
[=] DEG
36.
Enter operation,
show result
Example: 2 x [ 7 + 6 x (5 + 4) ] = 122
Press Display Comment

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[2] DEG
2. Enter value
[x] DEG
2. Enter operation
[ ( ] DEG
(
Enter operation,
show symbol
[7] DEG
7.
Enter value to
operate by
[+] DEG
7. Enter operation
[6] DEG
6.
Enter value to
operate by
[x] DEG
6. Enter operation
[ ( ] DEG
((
Enter operation,
show symbol
[5] DEG
5.
Enter value to
operate by
[+] DEG
5. Enter operation
[4] DEG
4.
Enter value to
operate by
[=] DEG
122.
Enter operation,
show result
• It is unnecessary to press the [ ) ] key before the [=] key
Constant Calculations
Example: 3 + 2.3 = 5.3 6 + 2.3 = 8.3
Press Display Comment
[3] DEG
3. Enter value
[+] DEG
3. Enter operation
[2] [•] [3] DEG
2.3
Enter value to
operate by
[=] DEG
5.3
Enter operation,
show result
[6] DEG
6.
Enter value to
operate by
[=] DEG
8.3
Enter operation,
show result
Example: 7 −5.6 = 1.4 −4.5 −5.6 = −10.1
Press Display Comment

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[7] DEG
7. Enter value
[−]DEG
7. Enter operation
[5] [•] [6] DEG
5.6
Enter value to
operate by
[=] DEG
1.4
Enter operation,
show result
[4] [•] [5] DEG
4.5
Enter value to
operate by
[+/−]DEG
−4.5
Enter operation,
show result
[=] DEG
−10.1
Enter operation,
show result
Example: 2.3 x 12 = 27.6 −9 x 12 = −108
Press Display Comment
[1] [2] DEG
12. Enter value
[x] DEG
12. Enter operation
[2] [•] [3] DEG
2.3
Enter value to
operate by
[=] DEG
27.6
Enter operation,
show result
[9] DEG
9.
Enter value to
operate by
[+/−]DEG
−9.
Enter operation,
show result
[=] DEG
−108.
Enter operation,
show result
Example: 74 ÷ 2.5 = 29.6 85.2 ÷ 2.5 = 34.08
Press Display Comment
[7] [4] DEG
74. Enter value
[÷] DEG
74. Enter operation
[2] [•] [5] DEG
2.5
Enter value to
operate by
[=] DEG
29.6
Enter operation,
show result
[8] [5] [•] [2] DEG
85.2
Enter value to
operate by
[=] DEG
34.08
Enter operation,
show result