SR270ll
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GENERAL GUIDE ............................................................................ 2
ᄼTURNING ON OR OFF ........................................................................ 2
ᄼBATTERY REPLACEMENT .................................................................. 2
ᄼAUTO POWER-OFF FUNCTION ........................................................... 2
ᄼRESET OPERATION........................................................................... 2
ᄼCONTRAST ADJUSTMENT .................................................................. 3
ᄼDISPLAY READOUT........................................................................... 3
BEFORE STARTING CALCULATION ............................................. 4
ᄼMODE SELECTION............................................................................ 4
ᄼUSING “2ND" KEYS........................................................................... 4
ᄼCURSOR ......................................................................................... 4
ᄼMAKING CORRECTIONS DURING INPUT ............................................... 4
ᄼREPLAY FUNCTION........................................................................... 5
ᄼERROR POSITION DISPLAY FUNCTION ................................................. 5
ᄼMEMORY CALCULATION .................................................................... 5
ᄼSTACK ............................................................................................ 6
ᄼORDER OF OPERATIONS ................................................................... 6
ᄼACCURACY AND CAPACITY ............................................................... 6
ᄼERROR CONDITIONS......................................................................... 8
BASIC CALCULATION .................................................................... 8
ᄼARITHMETIC CALCULATION................................................................ 9
ᄼPARENTHESES CALCULATIONS .......................................................... 9
ᄼPERCENTAGE CALCULATION ............................................................. 9
ᄼDISPLAY FORMATS........................................................................... 9
ᄼCONTINUOUS CALCULATION FUNCTION ............................................ 10
ᄼANSWER FUNCTION........................................................................ 10
SCIENTIFIC CALCULATION.......................................................... 10
ᄼLOGARITHMS AND ANTILOGARITHMS ................................................ 10
ᄼFRACTION CALCULATION ................................................................ 10
ᄼANGLE UNITS CONVERSION............................................................. 11
ᄼTRIGONOMETRIC / INVERSE-TRI. FUNCTIONS ................................... 11
ᄼHYPERBOLIC / INVERSE-HYP. FUNCTIONS........................................ 11
ᄼSEXAGESIMAL DECIMAL TRANSFORMATION ..................................... 11
ᄼCOORDINATES TRANSFORMATION ................................................... 12
ᄼPROBABILITY ................................................................................. 12
ᄼOTHER FUNCTIONS ( X
–1
,
,
3
,
y
, X
2
, X
3
, X
Y
) ........................ 12
STANDARD DEVIATION CALCULATION ..................................... 12
REGRESSION CALCULATION...................................................... 13
SR270ll / SR-275
S
cientific Calculator
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General Guide
Turning on or off
To turn the calculator on, press [
ON
/AC ] ; To turn the calculator off,
press [ OFF ].
Battery replacement
SR-270ll is powered by two alkaline batteries (GP76A).
If the display becomes dim and difficult to read, the batteries should
be replaced as soon as possible.
To replace batteries :
1) Remove the screws and the back cover.
2) Replace the old batteries and install new ones with polarity in
correct directions, then secure the screws in place and press [
ON
/AC ]
to turn the power on.
SR-275 is powered two AA-size ( UM-3 ) batteries. If the display
becomes dim and difficult to read, the batteries should be replaced
as soon as possible.
To replace batteries :
1) Slide the battery compartment cover in the direction indicated
by the arrow and remove it.
2) Remove the old batteries and install new ones with polarity in
correct directions, then replace the battery compartment cover
and press [
ON
/AC ].
Auto power-off function
This calculator automatically turns it off when not operated for
approximately 9~15 minutes. It can be reactivated by pressing
[
ON
/AC ] key and the display, memory, settings are retained.
Reset operation
If the calculator is on but you get unexpected results, press [
ON
/AC ]
and then [ MODE ] four times to display the below menu. A message
appears on the display to confirm whether you want to reset the
calculator and clear memory contents after pressing [ 2 ].
ENG RESET
1 2
→
]2[
RESET : N Y
1 2
To clear all variables, pending operations, statistical data, answers,
all previous entries, and memory, please press [ 2 ]. To abort the
reset operation without clearing the calculator, please press [ 1 ].
If the calculator is lock and further key operations becomes
impossible, please press [ 0 ] [
ON
/AC ] at the same time to release
the condition. It will return all settings to default settings.
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Contrast adjustment
Pressing the [Ÿ] or [ź] 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.
74 8 7
6 6.
DEG
Ç
−÷
Indikator
Indtastningslinje
Indikator
Resultatlinje
Entry line SR-270ll / SR-275 displays an entry of up to 79 digits.
Entries begin on the left ; those with more than 11 digits
scroll to the left. Press [Ź] or [Ż] to move the cursor
through an entry. However, whenever you input the 73rd
digit of any calculation, the cursor changes from “_” to
“Ŷ” to let you know memory is running low. If you still
need to input more, you should divide your calculation
into two or more parts.
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.
Indicators The following indicators appear on the display to indicate
you the current status of the calculator.
Indicator Meaning
M Independent memory
ņ Result is negative
2nd 2nd set of function keys is active.
.A. Alphabetic Keys ( .A. ~ .F., .M., .X. ~ .Y. ) are
active.
STORCL STO : Storing variable mode is active
RCL : Recalling variable mode is active
SD Statistics mode is active
REG Regression mode is active
DEGRAD Angle mode : DEGrees, GRADs, or RADs
ENG Engineering notation.
SCI Scientific notation.
FIX Number of decimal places displayed is fixed
HYP Hyperbolic-trig function will be calculated
BUSY While an operation is executing
ÍÎ There are digits to the left or right of the display
ÏÐ There are earlier or later results that can be
displayed
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Before starting calculation
Mode Selection
Each time [ MODE ] is pressed, various functions menus and all
argument values corresponding to the desired mode is shown on the
screen. It includes three calculation modes (COMP, SD, REG), three
angle units (DEG, RAD, GRAD), four display notations (FIX, SCI,
NORM, ENG) and reset function (RESET).
Entering an argument value can set up this calculator to operate as
you want it to. Give “SD“ as an example :
1. Press [ MODE ] once to display the calculation mode menu.
2. Enter [ 2 ] to let this calculator being operated under standard
deviation mode.
COMP SD REG
1 2 3
→
]2[
SD
0.
Using “2nd" keys
To execute the functions marked in yellow, please press [ 2nd ] and
then the corresponding key. When you press [ 2nd ], the
“2nd“ indicator shown in the display is to tell you that you will be
selecting the second function of the next key you press. If you press
[ 2nd ] by mistake, simply press [ 2nd ] again to remove the
“2nd“ indicator.
Cursor
Pressing [Ź] or [Ż] key can move the cursor to the left or the right.
Hold down any of those keys to move the cursor at high speed.
Pressing [ 2nd ] [Ÿ] or [ 2nd ] [ź] can scroll the display up or down
while there are previous entries hidden the display. You can reuse or
edit a previous entry when it is on the entry line.
Making corrections during input
To delete a character at the cursor, make the character underlined by
using [Ź] or [Ż] to move the cursor, and then press [ DEL ] to delete
the character.
To replace a character, make the character underlined by using [Ź]
or [Ż] to move the cursor, and then enter a new entry to replace the
character.
To insert a character, move the cursor to the position of the character
where you want to insert, it will be inserted in the front of the
character after pressing [ 2nd ] [ INS ] and entering a new character.
(Note) : The blinking cursor “
” means the calculator is in insert
mode On the contrary, the blinking cursor is displayed as
“_” and it means the calculator is in overwrite mode.
To clear all characters, clear all input character by [
ON
/AC ] key.
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Replay function
•
This function stores the latest operation executed. After execution
is completed, pressing [ 2nd ] [Ÿ] or [ 2nd ] [ź] key will display the
operation from the beginning or the end. You can continue moving
the cursor by [Ź] or [Ż] to edit it. To delete a digit, press [ DEL ].
( or, in overwrite mode, just type over the digit). See Example 1.
•
The replay function can keep input digits up to 256 characters for
SR-270ll
/
SR-275
. After execution is completed or during entering,
you can press either [2nd ] [Ÿ] or [ 2nd ] [ź] to display previous
input steps and edit values or commands for subsequent execu-
tion. See Example 2.
(Note) : The replay function isn’t cleared even when [
ON
/
AC
] is
pressed or power is turned off, so contents can be
recalled even after [
ON
/
AC
] is pressed.
Error position display function
•
When a mathematically illegal calculation is performed, error posi-
tion display function will tell you with the cursor where the error is.
Press [Ź] or [Ż] to move the cursor and then give it a correct en-
try. You can also clear an error by pressing [
ON
/
AC
] and then re-
entered the values and expression from the beginning. See Ex-
ample 3.
Memory calculation
Independent memory
•
Press [ M+ ] to add a result to running memory. Press [ 2nd ] [ M–]
to subtract the value from running memory. To recall the value in
running memory, press [ 2nd ] [ RCL ] [
.M. ]. To clear running
memory, press [ 0 ] [STO] [ .M. ]. See Example 4.
(Note) : Besides pressing [ STO ] key to store a value, you can
also assign values to memory variable M by [ M+ ] or [M–].
Memory variable
•
The calculator has nine memory variables for repeated use :
A
,
B
,
C
,
D
,
E
,
F
,
M
,
X
,
Y
. You can store a real number in any of the nine
memory variables. See Example 5.
* [ STO ] + .A. ~ .F., .M., or .X. ~ .Y. lets you store values to
variables.
* [ 2nd ] [ RCL ] or [ ALPHA ] +
.A. ~ .F., .M., or .X. ~ .Y. re-
calls the value of variable.
* [ 0 ] [ STO ] +
.A. ~ .F., .M., or .X. ~ .Y. clears the content to
a specified memory variable.
* [ 2nd ] [ Mcl ] [ = ] clears all variables.
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