# CITIZEN SR-135 User Manual

4.3 (3)
Contents
FEATURES ......................................................................... 2
THE KEYBOARD AND OPERATING CONTROLS ........... 2
CALCULATION................................................................. 11
1. Calculation order of priority................................................ 11
2. Addition, subtraction, multiplication and division and
constant calculations. ........................................................ 12
3. Memory calculation............................................................ 13
4. Calculations with parenthesis. ........................................... 14
5. Coordinate conversion:...................................................... 14
6. Complex Calculation.......................................................... 15
7. Statistical calculation. ........................................................ 16
SPECIFICATIONS ............................................................ 17
AUTOMATIC POWER OFF .............................................. 17
BATTERY REPLACEMENT ............................................. 17
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FEATURES
(1) Normal operations.
Four operation (+, –, x,
percentage.
(2) Memory calculation (X→M, MR, M+).
(3) General mathematical function:
Trigonometric (3) Arctrigonometric (3)
Logarithmic (2) Exponential (2)
Square Power
Square Root Cube Root
), xy,
÷
y
, auto-constant, parenthesis,
x
Root
Parenthesis Reciprocal
EXP +/–
SCI Factorial
FIX X↔Y
RND Coordinate conversion.
(4) Binary, octal, decimal and hexadecimal mode.
Mutual conversions and calculations of binary, octal, decimal, and
(5) Memory protection when power off.
(6) An automatic power off feature to preserve battery life.
(7) Statistics calculations.
• Number of sample (n).
• Total of square of all data (Σx2).
• Average (x).
• 2 kinds of the standard deviation (
π
n–1, σn).
σ
• Total of all data (Σx).
(8) 2-variable function polar-rectangular coordinate conversion.
THE KEYBOARD AND OPERATING CONTROLS
(1)
2. Set and clear the statistics mode.
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SD
[]
ON/C
: 1. Power on and clear an error condition.
-
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(2)
x!
: 1. Clear entry key.
[]
CE
2. Factorial function (x!).
x! = n x (n–1) x (n–2) x (n–3) x .....x 2 x 1
(3)
(4)
[OFF]
[SHIFT]
: Power off key.
: This is the key for specifying the second function. When
this key is pressed, the special display “SHIFT” lights. When this key press twice continuously, the second function mode releas.
(5)
[]
DRG
: a. Pressing this key will change the mode of angle unit

sequentially
and display it
on LCD.
b. Pressing this key after [SHIFT] key shall change the
mode of angle and shall convert the displayed data.
(6)
(7)
[0] ~ [9]
RND
[ ]
: Press these keys in their logical sequence to enter
: a. Use to set the decimal point when entering numbers.
DEG : DEG = GRAD x 180/200
numbers.
b. When press as the first number, it is regarded as [0]
and [ • ] keys are pressed.
c. Random as a second function.
Pressing this key shall display the random number.
The range of random number is 0.000~0.999.
(8)
: a. In setting data in the mantissa section, this key reverse
[+/–]
code in the mantissa section similarly for exponent section, it reverse code in the exponent section.
b. For the operation result, this key reverse code in the
mantissa section.
(9)
[+], [–], [x], [ ÷ ], [ ( ], [ ) ]
a. When the key operations are performed by these keys
according to a numerical expression, a result of operation is obtained according to mathematical priorities. Priorities discriminated are:
1) 1-variable function.
2) Expression in "( )"; (The most inner expression has priority in case of multiple parenthesis)
3) xy,
y
x
4) x, ÷
5) +, –
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b. Whenever the key is operated, the calculator discriminates the
above priorities and holds the data and operation keys pending as required.
This pending action is possible up to 6 times, and 15 levels or
more pending become error.
c. [ ( ] key is accepted only immediately after [CE], [+], [–], [x], [÷],
[xy], [
y
], [=], [ ( ] keys can not accepted in all other cases.
x
When this key is accepted, the displayed data is cleared to 0. When [ ( ] key is first accepted, the special display “( )” illuminates.
When a parenthesis expression is completed [ ) ] and [=] key or
When it is cleared by the [ON/C] key, etc. or when errors are generated, the special display “( )” goes out.
d. If it is within the allowable range of pending, [ ( ] can be input
into any place in an expression as many times as desired. However, if the key is pressed continuously 16 times or more, it becomes error.
e. From a viewpoint of numerical expression when the
corresponding “ ) ” key is not pressed, the operation is not executed even if the “ ( ” key is pressed. On the other hand, When the “ ( ” key is pressed and the “ = ” key is the pressed without pressing the corresponding “ ) ” key, the operation is also completed according to the priority.
(10) [X→M], [MR], [M+] Memory calculation
a. The memory register “M” used by these keys is a completely
independent single memory.
b. Display data is added to “M” (memory register) by [M+] key. If
data overflows at this time, the proceeding data is hold.
c. Display data is stored in “M” by [X→M] key.
d. Contents of “M” is displayed by [MR] key.
e. When any data except for 0 is stored in “M”, the special display
“M” illuminates.
(11)
[]
EXP
: 1. Exponent select key.
2. This key display a rounded value : 3.141592654.
(12)
%
: Calculation
[]
=
a. When any arithmetic functions constant mode has been set, the
displayed number is converted from a percentage to a decimal.
Example: 61.5%
Key Input Display
[6] [1] [ • ] [5] [SHIFT] [%] 0.615
b. When [=] key is pressed after [%] following arithmetic function
will be executed.
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CALCULATION
EXAMPLE
WHAT IS 30% OF 450?
KEY OPERATION LCD DISPLAY
450 [x] 30 [SHIFT] [%]
[=]
135.
0.3
WHAT PERCENTAGE OF 600 IS 120?
(120
600x100=20)
÷
120 [
] 600 [SHIFT] [%]
÷
[=]
6.
20.
WHAT 25% OF 400 IS AN EXTRA? (400+(400x25/100)
400 [+] 25 [SHIFT] [%]
[=]
100.
500.
=500)
WHAT 25% 0F 400 IS A DISCOUNT? (400–(400x25/100)
400 [–] 25 [SHIFT] [%]
[=]
100.
300.
=300)
(13) Trigonometric and arctrigonometric function / Hyperbolic and arc
hyperbolic trigonometric function (1-variable)
([sin], [cos], [tan], [sin
1
], [cos
1
], [tan
1
]).
These function are calculated according to respective defined
areas and accuracy shown in behind chart, any displayed result of operation can become operators.
(14) Exponential and Logarithmic functions (1-variable).
([In], [log], [e
X
], [10X]) Same as Trigonometric functions.
(15) Reciprocal, Square, Square Root, and Cube Root.
([1/x] , [x2], [ ] , [ 3 ]) Same as Trigonometric functions.
(16)
[ ]
a. These keys convert degrees, minutes, seconds, into
decimal degree and decimal degrees into degree minutes, and seconds.
b. On the “ ” format, the integer part of display data is
regarded as degree, 2 digits below the decimal point as minutes and the 3rd digit and belows as seconds.
Example:
[] <degree minute second>
2.111111111 [SHIFT] [ ] 2 06 3999
(39.99 seconds)
(17) Binary mode ([SHIFT],
BIN
, [0], [1] ).
[ ]
a. Data input and output are both binary integers in a maximum
of 10 digits.
b. A negative number is expressed in binary of two's
complement.
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