Owner's Manual
SCIENTIFIC
CALCULATOR
Please read before operating the unit
DS-700
This Datexx DS-700 Scientific
Calculator is designed for a variety of
scientific, statistical and computer
uses. It provides many important
functions necessary for complex cal-
culations.
TABLE OF CONTENTS
(LCD) Liquid Crystal Display Format . . . . .4
Display Symbols . . . . . . . . . . .. . . . . . 4
Setting Display Format............. . .. . . 7
Operating the Calculator . . . . .... . . . 9
One Factor Operations. . . . . . . . . . .21
Two Factor Operations. . . . . . . . . . . 21
Correcting Incorrect Entries . . . . . . 22
Correcting Overflow Errors. . . . . . . . 23
Scientific Notation. . . . . . . . . . . . . . . 25
Percentage. . . . . . . . . . . . . . . . . . . . 26
Logarithm and Exponential. . . . . . . 26
Trigonometric Calculations. . . . . . . . 27
Applications and Examples. . . . . . . 28
Business. . . . . . . . . . . . . . . . . . . . . . 28
Physics. . . . . . . . . . . . . . . . . . . . . . . .28
Civil Engineering. . . . . . . . . . . . . . . . 29
Electronics. . . . . . . . . . . . . . . . . . . . . 30
Parallel Resistance. . . . . . . . . . . . . . 31
Care and Maintenance . . . . . . . . . . 32
Replacing The Batteries. . . . . . . . . .33
FEATURES
Removable protective cover doubles
as a base for the calculator.
Large easy to read LCD (Liquid
Crystal Display).
Binary-Octal-Hexadecimal-Decimal
conversion.
Built-in Random Number Generator.
Built-in Trigonometric and Algebraic
Functions.
2
3
(LCD) LIQUID CRYSTAL DISPLAY FORMAT
FLOATING POINT DISPLAY
HYP
Hyperbolic function
designation symbol
Appears when a hyperbolic function is
designated.
DEG
Degree mode symbol
Appears when degree mode is desig-
nated or shows that the angular mode
of the converted result is in degrees.
SCIENTIFIC NOTATION DISPLAY
DISPLAY SYMBOLS
RAD
Radians mode symbol
Appears when radian mode is desig-
nated or shows that the a n g u l a r
mode of the converted result is in radi-
ans.
–
Negative symbol
Indicates the displayed number is a
negative number.
GRAD Grad mode symbol
Appears when grad mode is designat-
ed or shows that the angular mode of
the converted result is in grads.
M
Memory symbol
Appears when number is stored in
memory.
(
)
Parenthesis symbols
2ndF Second function symbol
Appears when 2ndF is pressed,
allowing access to alternate key func-
tions.
Appears when a calculation with
parenthesis is performed by pressing
the parenthesis key.
5
4
BIN
Binary mode symbol
SETTING UP DISPLAY FORMAT
Appears when the binary mode is set
or the displayed result is a binary
number.
Display Format
Press TAB key to change format from
floating point to scientific notion
OCT Octal mode symbol
Appears when the octal mode is set or
the displayed result is an octal num-
ber.
Change to scientific notion
HEX
Hexadecimal mode symbol
Appears when the hexadecimal mode
is set or the displayed result is a hexa-
decimal number.
Change to floating point
CPLX Complex number mode symbol
Appears when the complex number
mode is set.
Setting Decimal Point
STAT Statistical mode symbol
Appears when the statistical calcula-
tions mode is set.
Press 2ndF, TAB and Number of digit
Example: Decimal Point 4
A calculated result is displayed as a float-
ing point number within the range of:
0.000000001 ≤ 1 x ≤ 9999999999
Results outside this range are displayed in
scientific notation.
6
7
Example: Decimal Point 6
OPERATING THE CALCULATOR
Power off key
Press to turn off the calculator.
Automatically turns off 8 min-
utes after last keypress to con-
serve battery power.
Power on and clear / statisti-
cal calculation mode key
Press to turn on the calculator
or to clear the display.
Please note:
Once the decimal point is set, it will
remain after power is off, to resume
decimal point 2 (default), Please set
the decimal point to 2 again.
Press to activate statistical
program. The display is
Example:
Setting back to Decimal Point 2
cleared and STAT appears in
the display. In this mode the ),
x -->m, RM and M+ keys func-
tion as the n, x, S and DATA
keys respectively. Press 2ndF
to activate the ∑x, ∑x2, Ó
and CD keys.
2nd function key
Press to use alternate func-
tions located above most
keys.
8
9
Degree / Radian / Grad
selector / angular unit con-
version key
Used with trigonometric func-
tions for arc hyperbolic calcu-
lations.
Use to calculate trigonometric
and coordinate conversion. The
DRG key changes the angular
mode with each press:
Trigonometric / Inverse
Trigonometric function keys
DEG -> RAD -> GRAD -> DEG.
DEG MODE - Entries and
results are in decimal degrees.
RAD MODE - Entries and
results are in radians.
Press for the desired trigono-
metric function. Press 2ndF
first for inverse trigonometric
functions.
GRAD MODE - Entries and
results are in grads.
Display Format Exchange /
Tabulation key
Press to change display for-
mat from floating point to sci-
entific notation and back
again.
Functions the same as the
DEG key. The displayed num-
ber is converted into a number
of the specified angular mode.
Hyperbolic / Arc Hyperbolic
key
Used with trigonometric func-
tions for hyperbolic calcula-
tions.
Press 2ndF, TAB, then a digit
to specify the number of deci-
mal tab places in the dis-
played result.
10
11
Clear Entry / Factorial key
Press to clear the display of
an incorrect number.
Calculates the antilogarithm
base e of the displayed num-
ber.
Calculates the factorial of the
displayed number.
Common logarithm / antilog-
arithm and hexadecimal
number key
Degree / Minutes / Second ƒ
Decimal degrees conversion
/ Hexadecimal number key
Converts degree / minute /
second to decimal degree.
Press 2ndF first to convert
decimal degree to degree /
minute second.
Press to obtain the base 10
logarithm of the displayed
number.
Hexadecimal number F key
(HEX mode only).
Press to obtain the base 10
antilogarithm of the displayed
number.
Hexadecimal number D key
(HEX mode only).
Real number enter / coordi-
nate conversion key
Used when the real parts of
complex numbers are entered
and when calling the real
parts of calculated results.
Natural Logarithm /
Antilogarithm number key
Used to obtain the logarithm
base e (e= 2.718281828).
Hexadecimal number E key
(HEX mode only).
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13
Used during coordinate conver-
sions when entering the x coor-
dinate of the rectangular coordi-
nate (X, Y) or the r of the polar
coordinate. Also displays the
calculated values of X or r.
Right Shift / Complex num-
ber mode key
Press to delete the last num-
ber key pressed.
Press to set the complex num-
ber mode.
Press to convert polar coordi-
nates to rectangular
coordinates
.
Enter Exponent / Pi and
Hexadecimal number key
Press to enter a number in
scientific notation.
Hexadecimal number A key
(HEX mode only).
Imaginary number enter /
coordinate conversion key
Press to input the imaginary parts
of complex numbers or to display
the imaginary parts of a calculat-
ed result.
Displays the value of Pi (π)
Pi= 3.141592654
During coordinate conversions,
press to enter the retangular y
coordinate, or the ø of the polar
coordinates (r, ø). Also used to
display the calculated values of y
or ø.
y /x√ y and Hexadecimal
number key
Raises the displayed number
to a power.
Hexadecimal number B key
(HEX mode only).
Press to convert polar coordinates
to rectangular coordinates.
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15
Calculates the Xth root of Y.
Press to enter an open paren-
thesis in the display.
Square root / cube root and
hexadecimal number key
Press to exchange the dis-
played number with the num-
ber from the working register
(x -> y)
Calculates the square root of
the displayed number.
Hexadecimal number B key
(HEX mode only).
Close parenthesis / statisti-
cal calculation key
Press to enter a close paren-
thesis in the display. In statisti-
Calculates the cube root of the
displayed number.
cal
mode it displays the
number of the samples
entered. (n)
Square / reciprocal key
Calculates the square of the
displayed number.
Press to obtain the sum of the
data (∑x)
Calculates the reciprocal of
the displayed number.
Open parenthesis /
exchange key
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17
Number keys
Press to enter number 0-9.
Plus / Decimal number key
Press for addition.
Press to convert the displayed
number to a decimal number
(base 10).
Division / binary number key
Press for division.
Memory-in / statistical calcula-
tion key
Press to convert the displayed
number to a binary
number(base 2).
Press to store the displayed num-
ber into memory. To clear the
memory, press the ON/C key then
the x-> m key. In statistical mode,
press to obtain the mean value of
the data.
Multiplication / Octal num-
ber key
Press for multiplication.
Press to obtain the sum of
squares of the data (∑ x^3)
Press to convert the displayed
number to an octal
number(base 8).
Recall memory / Statistical cal-
culation key
Displays the contents of the mem-
ory. In statistical mode, press to
obtain the standard the deviation
of the data simple.
Subtraction / Hexadecimal
number key
Press for subtraction.
Press to convert the displayed
number to a hexadecimal
number (base 2).
Press to obtain the standard
deviation of the population of
data.
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19
Memory plus / DATA CD key
Press to add the displayed num-
ber to the contents of the
Memory. To subtract the displayed
number from the memory, press
the +/- key first. In statistical
mode, press to enter data.
In statistical mode, press to delete
a wrong data entry.
ONE FACTOR OPERATIONS
One-Factor operations require the entry
of only one mathematical function. The
single factor is entered into the calcula-
tion when you press the function key. You
do not have to press = to complete the
calculation.
Some one-factor functions include √, cos,
sin, tan and log.
Example:
Change sign key
sin 90˚ = 1
Press to change the displayed
number from positive to negative
and vice versa.
Enter 90 [ sin ]. 1 is displayed
TWO-FACTOR OPERATIONS
Two-Factor operations require the entry
of at least two mathematical funtions.The
first factor is entered when you press the
function key such as +, --, x, ÷, or yx .
The second factor is entered when you
press the = key and the calculation is
completed.
Decimal point / random
number key
Press to
place a decimal point number in
the display.
Press to generate random num-
bers between 0.000 and 0.999
(Decimal mode only).
Example: 7 x 5 = 35
Equals /Percent key
Displays the results of arith-
metic and complex calcula-
tions.
Used for percentage calcula-
tions.
Enter 7 [ x ]
5
[ = ] . 35 is diplayed.
Two factor functions can be chained
together but algebraic hierarchy is always
in effect. To perform a calculation of a
lesser
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21
hierarchy first, press [ = ] to perform
the higher hierarchy calculation, then
enter the lower hierarchy calculation
to get an accurate result.
CORRECTING OVERFLOW ERRORS
If a calculated result exceeds the dis-
play ability or the memory capacity,
the display stops and E appears in
the display. Press [ ON/C ] to
resume calculating.
Example: (10 + 5 ) ÷ 3 = 5
Incorrect: 10 [+] 5 [÷] 3 = 11.6667
The range of calculated results and
memory capacity are within the
range of 1 x 10 -99 to 9.9999999 x
10 99
Correct: 10 [+] 5 [=] 15
[÷] 3 = 5
With this method, calculations can be
performed in the proper order.
An error also occurs if you try to
divide a number by 0 or extract the
square root of a negative number.
CORRECTING INCORRECT ENTRIES
If you press the wrong function key (
+, --, x, or ÷ ), just press the correct
function after pressing the wrong
one. The calculator preforms the last
function pressed.
CALCULATION EXAMPLES MIXED
2 x 8 - ( 3 + 5 ) x 4 - 6 x 7 = 20
4.3 - 1.8
Memory
Contents
Press
Display
3 [+] 5 [=] [x] 4 [= ] [M+]
6 [x] 7 [+/– ] [=] [M+]
4.3 [–] 1.8 [=]
M 32
M–42 –10
M2.5
M–4
M 4
M 16
M 20
32
Example: If you press the 5 + -- x 5
=, the displayed result will be 25 as [
x ] was the last function key pressed.
–10
–10
4
20
20
[÷] [RM] [=] [2ndF] [1/x]
[+/–] [x-->M]
If you press the wrong number key,
press [ ON/C ] once to clear the last
entry, or twice to clear all entries
made. Entries made with the memory
keys are not affected.
2 [x] 8 [=] [M+]
[RM]
22
23
CONSTANT AND REPEAT
SCIENTIFIC NOTATION
When performing calculations, the
last function and number entered are
retained as a constant.
Calculate
(72.5 x 10 20 = 1.75 x 10 20
)
(-4.7 x 10-11
)
Examples:
= -1.57978 x 10 32
To
To calculate 7 + 5 + 5 + 5 = 22
Press 7 [ + ] 5 [ = ] [ = ] 22
In this case [ + ] and 5 are the con-
stants.
Press
Display
Calculate
(72.5 x
10 20
(72.5 [EXP]
20 [+]
7.25 21
7.425 21
1.75 x
1.75 [EXP]
20 [=]
1020
)
To calculate 2 + 3 = 5 and 4 + 3 = 7
Press 2 [ + ] 3 [ = ] 5
4 [ = ]
5
7
÷ (–4.7
[÷] 4.7 [+/–]
x 10 –11
[EXP]11[+/–]
–4.7 –11
In this case [ + ] and 3 are the con-
stants.
= –1.57978
x 1032
[=]
–1.5797872 32
When calculating powers
5 2 = 25 and 4 2 = 16
Press 5 [ yx] 2 [ = ]
4 [ = ]
25
16
In this case [ yx ] 2 is the constant.
If a result is displayed in scientific
notation, you can press [ F <--> E ]
to convert the number to floating
point and vice- versa.
24
25
PERCENTAGE
To calculate
cos-1 0.5 = 66.666666 grads
To
Press
Display
Calculate
6% of 1250
=75
Angular
Mode
Press
Display
1250 [X] 6
[2ndF][%][=]
0.5 [2ndF] [cos–1
]
GRAD
6.666667
75
65 + 15%
=74.75
65 [+] 15
[2ndF][%][=]
74.75
To calculate
tan π/5 = 0.72654253
129.95 – 10%
=116.955
129.95 [–] 10
[2ndF][%][=]
Angular
116.955
Press
Display
Mode
RAD
[2ndF] [π] [÷] 5 [=]
0.62831853
0.726542528
LOGARITHM AND EXPONENTIAL
To
[tan]
Press
Display
Calculate
log 0.02
= –1.69897
0.02 [log]
–1.698970004
To calculate
sin 30˚ x √ 5 = 1.118034
Angular
In (50/3)
=2.8134107
50 [÷] 3
Press
Display
Mode
[=] [In]
2.813410717
282475249
DEG
30 [sin] [x]
5 [√] [=]
0.5
1.118033989
710
7[y ] 10
[=]
=2.82475x108
5
56 [yx ] 3
5 [2ndF]
[1/x] [=]
√56
56
5
To calculate
90˚ = 1.5707963 radians
= 100 grads
=2.236854
2.236853829
Angular
TRIGONOMETRIC CALCULATIONS
Repeatedly press DEG to select
degrees, radians or grads as the
trigonometric unit.
Press
Display
Mode
DEG
RAD
90
90
[2ndF] [DRG->]
[2ndF] [DRG->]
1.570796327
100
GRAD
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27
APPLICATIONS AND EXAMPLES
CIVIL ENGINEERING
BUSINESS
Trigonometric Functions
Calculate the future value of a $1000 invest-
ment compounded annually at a rate of 6% for
7 years.
FV
=
=
=
p (1+i )n
1000 (1+0.06) 7
1503.63
Press
Display
1 [+] 0.06 [=] [yx] 7
[=]
[X] 1000 [=]
1.503630259
1503.630259
In this right triangle,
A = 5.7 feet and a = 30 degrees.
Determine the value of C.
PHYSICS
If a ball is thrown upwars with a velocity of 75
feet per second, what is its velocity at the end
of 1.6 seconds
sin a = A/C
sin 30 degrees = 5.7/C
C = 5.7 / sin 30 degrees
C = 5.7 / 5
( g = 32.2 ft/sec2) ?
Velocity:
Height:
V
S
= Vo - gl
C = 11.4
= 75 - ( 32.2 x 16)
= 23.48 ft/sec.
= Vol - 1/2 gl2
Angular
Mode
Press
Display
2
=
(75 x1.6)– (1/2 x 32.2 x (1.6 ) )
DEG
5.7 [÷]
30 [sin]
[=]
5.7
0.5
11.4
= 78.784 ft.
Press
Display
75 [–] 32.2 [X] 1.6 [=]
23.48
75 [X] 1.6 [–] 2 [2ndF][1/x][X]
0.5
78.784
32.2 [X] 1.6 [X2] [=]
28
29
In another right triangle,
A = 6 feet and C = 15 degrees.
Determine the value of a, b and B.
ELECTRONICS
Amplifier Gain
sin a = A /C
sin a = 6 / 15 = 0.4
sin-1 .4 = 23.58
a = 23.58 degrees
b = 90 - 23.58 = 66.42 degrees
cos a = B / C
cos 23.58 = B /15
B = cos 23.58 x 15
B = .92 x 15 = 13.75 feet
Calculate the value of Av
Voltage gain AV= 20 log Vo/ Vi
= 20 log
3
1x10-3
Angular
Mode
=69.54242509dB
Press
Display
DEG
0 [X->M]
6 [÷]
0
6
0.4
Press
Display
15 [=]
[2ndF] [sin –1
[M+]
90 [–] [RM] [=]
0 [X->M]
]
3 [÷] [EXP] 3 [+/– ]
[=] [log] [X]
20 [=]
1.–03
3.477121225
69.54242509
23.57817848
M 32.57817848
M 66.42182152
0
23.58 [cos]
[X] 15 [=]
0.916502421
13.74753633
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31
PARALLEL RESISTANCE
REPLACING THE BATTERIES
This calculator is powered by two internal
batteries LR 44 or A76. If the display
gets dim or calculations slow down the
batteries should be replaced.
Three resistors are connected in par-
allel. Their values are 540 ohms, 470
ohms and 680 ohms.
Calculate the total equivalent resist-
ance.
To replace the batteries:
Req =
1
1.Remove the six screws on the back of
the calculator and lift off the back cover.
1 + 1 + 1
R1
R2
R3
2.Replace the two batteries located near
the tip of the calculator with new batteries
following the polarity shown in the illustra-
tion.
Req =
1
1 + 1 + 1
680 470 540
3.Replace the back cover and screws.
Press
Display
680 [2ndF] [1/x ] [+]
470 [2ndF] [1/x ] [+]
540 [2ndF] [1/x ] [=]
[1/x ]
0.001470588
0.003598247
0.005450 100
183.4828833
BATTERY PRECAUTIONS
1.Only use the size and type of batteries
specified.
CARE AND MAINTENANCE
2.Follow the correct polarity when
installing the batteries. Reversed batter-
ies can cause damage to the calculator.
Attempting to modify or tamper with
the caclulator’s interal components
can cause a malfunction and invali-
date the warranty.
3.If the calculator is not going to be used
for a long period of time, remove the bat-
teries to prevent the damage or injury
from possible battery leakage.
32
33
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