Citizen SRP-285N: instruction

SRP-280N/SRP-285N

HDBSR285T19 (SR285,A)

2010/04/26

140X75mm

SR285,A COVER front

E – 1 

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

E – 2

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

E – 3 

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.

E – 4

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

D EG

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 

M

 Independent 

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 : 

DEG

rees, 

GRAD

s, or 

RAD

s 

ENGSCI

ENG

ineering or 

SCI

entific notation 

TAB

Number of decimal places displayed is fixed 

HYP

Hyperbolic-trig function will be calculated 

BUSY

While an operation is executing