Datexx ECO-CALC DS-700 User manual

Owner's Manual
SCIENTIFIC
CALCULATOR
DS-700
Please read before operating the unit

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.
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.
TABLE OF CONTENTS
(LCD) Liquid Crystal Display Format .....4
DisplaySymbols.................4
Setting Display Format............. . ....7
OperatingtheCalculator...........9
OneFactorOperations...........21
TwoFactorOperations...........21
CorrectingIncorrectEntries......22
CorrectingOverflowErrors........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
2 3

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.
RAD Radians mode symbol
Appears when radian mode is desig-
natedorshowsthattheangular
mode of the converted result is in radi-
ans.
GRAD Grad mode symbol
Appears when grad mode is designat-
ed or shows that the angular mode of
the converted result is in grads.
( ) Parenthesis symbols
Appears when a calculation with
parenthesis is performed by pressing
the parenthesis key.
(LCD) LIQUID CRYSTAL DISPLAY FORMAT
FLOATING POINT DISPLAY
SCIENTIFIC NOTATION DISPLAY
DISPLAY SYMBOLS
– Negative symbol
Indicates the displayed number is a
negative number.
M Memory symbol
Appears when number is stored in
memory.
2ndF Second function symbol
Appears when 2ndF is pressed,
allowing access to alternate key func-
tions.
45

SETTING UP DISPLAY FORMAT
Display Format
Press TAB key to change format from
floating point to scientific notion
Change to scientific notion
Change to floating point
Setting Decimal Point
Press 2ndF, TAB and Number of digit
Example: Decimal Point 4
BIN Binary mode symbol
Appears when the binary mode is set
or the displayed result is a binary
number.
OCT Octal mode symbol
Appears when the octal mode is set or
the displayed result is an octal num-
ber.
HEX Hexadecimal mode symbol
Appears when the hexadecimal mode
is set or the displayed result is a hexa-
decimal number.
CPLX Complex number mode symbol
Appears when the complex number
mode is set.
STAT Statistical mode symbol
Appears when the statistical calcula-
tions mode is set.
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.
76

Example: Decimal Point 6
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.
Example:
Setting back to Decimal Point 2
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.
Press to activate statistical
program.The display is
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.
89

Used with trigonometric func-
tions for arc hyperbolic calcu-
lations.
Trigonometric / Inverse
Trigonometric function keys
Press for the desired trigono-
metric function. Press 2ndF
first for inverse trigonometric
functions.
Display Format Exchange /
Tabulation key
Press to change display for-
mat from floating point to sci-
entific notation and back
again.
Press 2ndF, TAB, then a digit
to specify the number of deci-
mal tab places in the dis-
played result.
Degree / Radian / Grad
selector / angular unit con-
version key
Use to calculate trigonometric
and coordinate conversion.The
DRG key changes the angular
mode with each press:
DEG -> RAD -> GRAD -> DEG.
DEG MODE - Entries and
results are in decimal degrees.
RAD MODE - Entries and
results are in radians.
GRAD MODE - Entries and
results are in grads.
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.
10 11

Calculates the antilogarithm
base e of the displayed num-
ber.
Common logarithm / antilog-
arithm and hexadecimal
number key
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.
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.
Clear Entry / Factorial key
Press to clear the display of
an incorrect number.
Calculates the factorial of the
displayed number.
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.
Hexadecimal number D key
(HEX mode only).
Natural Logarithm /
Antilogarithm number key
Used to obtain the logarithm
base e (e= 2.718281828).
Hexadecimal number E key
(HEX mode only).
12 13

Right Shift / Complex num-
ber mode key
Press to delete the last num-
ber key pressed.
Press to set the complex num-
ber mode.
Enter Exponent / Pi and
Hexadecimal number key
Press to enter a number in
scientific notation.
Hexadecimal number A key
(HEX mode only).
Displays the value of Pi (π)
Pi= 3.141592654
y /x√y and Hexadecimal
number key
Raises the displayed number
to a power.
Hexadecimal number B key
(HEX mode only).
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.
Press to convert polar coordi-
nates to rectangular
coordinates .
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.
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.
Press to convert polar coordinates
to rectangular coordinates.
14 15

Press to enter an open paren-
thesis in the display.
Press to exchange the dis-
played number with the num-
ber from the working register
(x -> y)
Close parenthesis / statisti-
cal calculation key
Press to enter a close paren-
thesis in the display. In statisti-
cal mode it displays the
number of the samples
entered. (n)
Press to obtain the sum of the
data (∑x)
Calculates the Xth root of Y.
Square root / cube root and
hexadecimal number key
Calculates the square root of
the displayed number.
Hexadecimal number B key
(HEX mode only).
Calculates the cube root of the
displayed number.
Square / reciprocal key
Calculates the square of the
displayed number.
Calculates the reciprocal of
the displayed number.
Open parenthesis /
exchange key
16 17

Plus / Decimal number key
Press for addition.
Press to convert the displayed
number to a decimal number
(base 10).
Memory-in / statistical calcula-
tion key
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.
Press to obtain the sum of
squares of the data (∑x^3)
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.
Press to obtain the standard
deviation of the population of
data.
Number keys
Press to enter number 0-9.
Division / binary number key
Press for division.
Press to convert the displayed
number to a binary
number(base 2).
Multiplication / Octal num-
ber key
Press for multiplication.
Press to convert the displayed
number to an octal
number(base 8).
Subtraction / Hexadecimal
number key
Press for subtraction.
Press to convert the displayed
number to a hexadecimal
number (base 2).
18 19

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:
sin 90˚ = 1
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.
Example: 7 x 5 = 35
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
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.
Change sign key
Press to change the displayed
number from positive to negative
and vice versa.
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).
Equals /Percent key
Displays the results of arith-
metic and complex calcula-
tions.
Used for percentage calcula-
tions. 2120

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.
The range of calculated results and
memory capacity are within the
range of 1 x 10 -99 to 9.9999999 x
10 99
An error also occurs if you try to
divide a number by 0 or extract the
square root of a negative number.
CALCULATION EXAMPLES MIXED
2 x 8 - ( 3 + 5 ) x 4 - 6 x 7 = 20
4.3 - 1.8
hierarchy first, press [ = ] to perform
the higher hierarchy calculation, then
enter the lower hierarchy calculation
to get an accurate result.
Example: (10 + 5 ) ÷ 3 = 5
Incorrect: 10 [+] 5 [÷] 3 = 11.6667
Correct: 10 [+] 5 [=] 15
[÷] 3 = 5
With this method, calculations can be
performed in the proper order.
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.
Example: If you press the 5 + -- x 5
=, the displayed result will be 25 as [
x ] was the last function key pressed.
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.
22
Display Memory
Contents
Press
3 [+] 5 [=] [x] 4 [= ] [M+]
6 [x] 7 [+/–] [=] [M+]
4.3 [–] 1.8 [=]
[÷] [RM] [=] [2ndF] [1/x]
[+/–] [x-->M]
2 [x] 8 [=] [M+]
[RM]
M 32 32
M–42 –10
M2.5 –10
M–4 –10
M 4 4
M 16 20
M 20 20
23

SCIENTIFIC NOTATION
Calculate
(72.5 x 10 20 = 1.75 x 10 20)
(-4.7 x 10-11)
= -1.57978 x 10 32
If a result is displayed in scientific
notation, you can press [ F <--> E ]
to convert the number to floating
point and vice- versa.
CONSTANT AND REPEAT
When performing calculations, the
last function and number entered are
retained as a constant.
Examples:
To calculate 7 + 5 + 5 + 5 = 22
Press 7 [ + ] 5 [ = ] [ = ] 22
In this case [ + ] and 5 are the con-
stants.
To calculate 2 + 3 = 5 and 4 + 3 = 7
Press 2 [ + ] 3 [ = ] 5 5
4 [ = ] 7
In this case [ + ] and 3 are the con-
stants.
When calculating powers
5 2 = 25 and 4 2 = 16
Press 5 [ yx] 2 [ = ] 25
4 [ = ] 16
In this case [ yx ] 2 is the constant.
24 25
Display
To
Calculate
(72.5 x
10
1.75 x
10 )
÷(–4.7
x 10
= –1.57978
x 10
7.25 21
7.425 21
–4.7 –11
–1.5797872 32
(72.5 [EXP]
20 [+]
1.75 [EXP]
20 [=]
[÷] 4.7 [+/–]
[EXP]11[+/–]
[=]
Press
20
20
–11
32

To calculate
cos-1 0.5 = 66.666666 grads
To calculate
tan π/5 = 0.72654253
To calculate
sin 30˚ x √5 = 1.118034
To calculate
90˚ = 1.5707963 radians
= 100 grads
PERCENTAGE
LOGARITHM AND EXPONENTIAL
TRIGONOMETRIC CALCULATIONS
Repeatedly press DEG to select
degrees, radians or grads as the
trigonometric unit.
Display
To
Calculate
6% of 1250
=75 75
1250 [X] 6
[2ndF][%][=]
Press
65 + 15%
=74.75 74.75
65 [+] 15
[2ndF][%][=]
129.95 –10%
=116.955 116.955
129.95 [–] 10
[2ndF][%][=]
Display
To
Calculate
log 0.02
= –1.69897 –1.698970004
0.02 [log]
Press
In (50/3)
=2.8134107 2.813410717
50 [÷] 3
[=] [In]
7
=2.82475x10 282475249
7[y ] 10
[=]
10 8
√56
=2.236854 56
5
2.236853829
56 [y ] 3
5 [2ndF]
[1/x] [=]
5x
Display
Angular
Mode
GRAD 6.666667
0.5 [2ndF] [cos ]
Press –1
Display
Angular
Mode
RAD 0.62831853
0.726542528
[2ndF] [π] [÷] 5 [=]
[tan]
Press
Display
Angular
Mode
DEG 0.5
1.118033989
30 [sin] [x]
5 [√] [=]
Press
Display
Angular
Mode
DEG
RAD
GRAD
90
1.570796327
100
90
[2ndF] [DRG->]
[2ndF] [DRG->]
Press
26 27

APPLICATIONS AND EXAMPLES
BUSINESS
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
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
( g = 32.2 ft/sec2) ?
Velocity: V = Vo - gl
= 75 - ( 32.2 x 16)
= 23.48 ft/sec.
Height: S = Vol - 1/2 gl2
= (75 x1.6)– (1/2 x 32.2 x (1.6 )2)
= 78.784 ft.
Display
23.48
75 [–] 32.2 [X] 1.6 [=]
Press
0.5
78.784
75 [X] 1.6 [–] 2 [2ndF][1/x][X]
32.2 [X] 1.6 [X ] [=]
2
CIVIL ENGINEERING
Trigonometric Functions
In this right triangle,
A = 5.7 feet and a = 30 degrees.
Determine the value of C.
sin a = A/C
sin 30 degrees = 5.7/C
C = 5.7 / sin 30 degrees
C = 5.7 / 5
C = 11.4
Display
1.503630259
1503.630259
1 [+] 0.06 [=] [y ] 7
[=]
[X] 1000 [=]
Press x
28 29
Display
Angular
Mode
DEG 5.7
0.5
11.4
5.7 [÷]
30 [sin]
[=]
Press

ELECTRONICS
Amplifier Gain
Calculate the value of Av
Voltage gain AV= 20 log Vo/ Vi
= 20 log 3
1x10-3
=69.54242509dB
In another right triangle,
A = 6 feet and C = 15 degrees.
Determine the value of a, b and B.
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
Display
Angular
Mode
DEG 0
6
0.4
23.57817848
M 32.57817848
M 66.42182152
0
0.916502421
13.74753633
0 [X->M]
6 [÷]
15 [=]
[2ndF] [sin ]
[M+]
90 [–] [RM] [=]
0 [X->M]
23.58 [cos]
[X] 15 [=]
Press
–1
30 31
Display 1.–03
3.477121225
69.54242509
3 [÷] [EXP] 3 [+/–]
[=] [log] [X]
20 [=]
Press

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.
To replace the batteries:
1.Remove the six screws on the back of
the calculator and lift off the back cover.
2.Replace the two batteries located near
the tip of the calculator with new batteries
following the polarity shown in the illustra-
tion.
3.Replace the back cover and screws.
BATTERY PRECAUTIONS
1.Only use the size and type of batteries
specified.
2.Follow the correct polarity when
installing the batteries. Reversed batter-
ies can cause damage to the calculator.
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.
PARALLEL RESISTANCE
Three resistors are connected in par-
allel. Their values are 540 ohms, 470
ohms and 680 ohms.
Calculate the total equivalent resist-
ance.
Req = 1
1 + 1 + 1
R1 R2 R3
Req = 1
1 + 1 + 1
680 470 540
CARE AND MAINTENANCE
Attempting to modify or tamper with
the caclulator’s interal components
can cause a malfunction and invali-
date the warranty.
Display
0.001470588
0.003598247
0.005450 100
183.4828833
680 [2ndF] [1/x ] [+]
470 [2ndF] [1/x ] [+]
540 [2ndF] [1/x ] [=]
[1/x ]
Press
32 33

Datexx Limited Warranty
This product is warranted against defects for 1 year from
date of purchase. Within this period, we will replace or
repair it, at our option, without charge for parts and labor,
with the exception of accessories such as batteries, wallets,
etc.
Return the defective unit with proof of purchase and a
check or money order for $5.00 (to cover postage, insur-
ance and handling) toTeledex Service Center, 1Atlas St.,
Kenilworth, NJ, 07033.
This warranty does not cover products subjected to misuse,
accidental damage, or repair by other than TELEDEX. In no
event shall TELEDEX be liable for consequential econom-
ic damage or damage to property.
Except as provided herein, DATEXX makes no express
warranties and any implied warranties are limited in dura-
tion to the written limited warranties contained herein.
Some states do not permit limitation or exclusion of implied
warranties; therefore, the aforesaid limitation(s) or exclu-
sion(s) may not apply to the purchaser.
This warranty gives you specific legal rights and you may
also have other rights which vary from state to state.
© 2000 Teledex
All Rights Reserved.
Datexx is a trademark of Teledex Inc.
WWW.DATEXX.COM