Victor 18-1721 User manual

Welcome to the world of Victor calculator owners
Congratulations on your choice of a Victor electronic
calculator. Careful design coupled with the use of quality
materials, painstaking American workmanship, and
advanced research and production facilities, have given you
an instrument which. with proper care, will provide years of
trouble-free service. To keep your machine in top operating
condition-and to assure its giving you the long service
it is designed to provide-be sure to ask your Victor
representative about the low cost protection offered by a
Victor
Full Coverage Maintenance Agreement.
VICTOR COMPTOMETER CORPORATION
Contents
Functions of
operating controls 2-3
Addition Isubtraction 4
Multiplication 5
Division 6
Memory group 7
Special functions
8-9
Power raising key
Reciprocal key
Square
root key
Pi key
Change sign key
Exchange key
Logarithmic group 10-11
Trigonometric group 12-13
Degrees
Radians
The finest materials and workmanship go
into the Series 1800 Electronic Calculator
assuring you dependable performance
over along period of time.
Ninety day guarantee. ThiS Victor 1800
Electronic Calculator is guaranteed for
ninety days for parts and labor.
Any guarantee. statutory or otherwise.
does not include replacement or repair
of parts when damage or defect is aresult
of accident, abuse, or the elements.

VICTOR ELECTRONIC DISPLAY CALCULATOR MODEL 18-1721
'\ () c> rr"'
\..) i!
Arithmetic: Add. subtract. multiply.
divide and square roOt.
Trigonometric: Sin x. cos x. tan x.
arcsin x. arccos x, and
arctan x. Angles can
be expressed in terms
of degrees
or radians.
Logarithmic: Loge x. log,o x. eX and lOx
Special: xv. 'Ix. TT. change sign.
exchange (reverse) operation
and accumulating memory.

Function of operating controls MODEL 18-1721
ON/OFF SWITCH: Located beneath the right
front. Left position is "ON" -right position
is
"OFF".
CLEAR-ALL KEY: Clears amounts in the entire
machine. Sets initial state.
CLEAR KEY: Clears display. Also clears over-
flow condition, without clearing keyboard.
ADD KEY: Adds keyboard entries and causes
running sum
to be displayed. Also, when de-
pressed repeatedly, performs constant
addition.
MINUS KEY: Subtracts keyboard entries and
causes running sum
to be displayed. Also,
when depressed repeatedly. performs repeat
subtraction.
MULTIPLY KEY: Enters displayed value as
multiplicand. Also completes asequential
calculation and sets
that result up for sub-
sequent multiplication.
DIVIDE KEY: Enters the displayed value as
dividend. Also completes asequential cal-
culation and sets
that result up for subse-
quent division.
MEMORY PLUS KEY: Adds entries or results
to the value in memory.
MEMORY RECALL KEY: Displays value from
the memory for use as any factor or for
reference.
MEMORY CLEAR KEY: Sets memory to zero
without clearing display.
EQUALS KEY: Calculates results in multi-
plication. division, and power raising com-
putations. Retains multiplicand or divisor for
further computations.
SQUARE ROOT KEY: Calculates the square
root of any positive displayed value.
CHANGE SIGN KEY: Changes the algebraic
sign of the displayed value.
PI KEY: Enters the constant 'IT into the dis-
play register.
EXCHANGE KEY: Exchanges the displayed
value with the value in the calculating
register.
RECIPROCAL KEY: Calculates the reciprocal
of displayed value.
POWER RAISING KEY: Raises X to the wh ole
number or fractional ypower.

LOG BASE SELECTOR SWITCH: COM po-
sition (switch up) conditions the calculator
to compute common logs (log,o) or antilogs
(lOX). NAT position (switch down) condi-
tions the calculator to compute natural logs
(loge) or antilogs (eX).
LOG KEY: Calculates the common log (log,o)
or the natural log (loge).
INVERSE KEY: Conditions the calculator to
compute the following:
(a) Antilogs lOx or eX.
(b) Inverse trig functions sin-
1,
cos-"
tan-
1•
Nore: The INV key and then the LOG key
are
touched for calculating antilogs, and INV
is touched prior to touching the SIN, COS
or TAN keys for calculating inverse trig
functions.
DEGREE/RADIAN SELECTOR SWITCH: DEG
position (switch up) conditions the calcula-
tor to compute the trigonometric functions
(sin, cos or tan) of an angle expressed in
degrees or the inverse trigonometric func-
tions (sin-
1,
cos-
1,
tan-') in degrees.
RAD
position (switch down) conditions
the calculator to compute the sin, cos or tan
of an angle expressed in radians or the in-
verse trigonometric functions (sin-
1•
cos-',
tan-
1)in radians.
TRIG FUNCTION KEYS: Calculates the sin,
cos or tan
of an angle expressed in degrees
or radians. The secant.
cosecant and cotan-
gent functions can be obtained by perform-
ing cosine, sine and tangent functions first
. IX .1
and touching 1key I.e.,secanto =:c::-:c-.--;-:
cosine H
Calculates tl18 sin-
1,
cos-
1,or
tan-
1,ex-
pressing
the angles in degrees or radians
when used in sequence wirh the INV key.
To find sec-'. csc-'. caC" first invert secant,
cosecant or cotangent and then find C05-
ine-
1,
sine-
1,or
tangenc
1,respectively, Le"
secanC1 =cosine-
1(1 )
secant
(-)
OVERFLOW: Fis displayed for the following
operations-where results are> 14 digits to
left of the decimal point and entries are>
14 digits
Other functions have been defined to dis-
play F:
•Division by zero, including 1/X
where X ~ a
•Square Root of anegative number
•Arc sine or arc cosine of a number>
•Log X, In X, and Xv of zero or a
negative number
•
Computing tangent 90° ±n 180
where n is an integer
ACCURACY: All arithmetic functions,
+, -, +, X, 'Ix and ,,- yield 14 place
accuracy truncated
to the least significant
digit where the value of Xis :2: 10-
14
or
,; 10+
14
-1.
All exponential and trigonometric
functions yield 12 place accuracy rounded
to the least significant digit within the
following range of arguments:
log" Xand loge X X is :2: 10-
14
or'; 10"3
Inverselog
lO
X Xis:2: -12.30r < +14
Inverse loge X X is:2: -28.4 or < +32.2
Xv Xis ~ 10-
14
or:::';; 10+
13
Note: For Xv the limits of yare dependent
on the value of X.
SinX,cosX, tanX XiS:2: -360° or ,; +360
Sin-
1
X, Cos-
1X X
is :2:, -lor'; + 1
Tan-
1X
Xis> -10"or < +10"
12 place accuracy is assured if arguments
are
withi n .01 of adegree ±90° for sine
and
cosine; or 10 place accuracy if
arguments are within one degree (1°)
±90" for tangent.
To assure 12 place accuracy when
computing functions of angles> 360°
first convert
to an angle between ±360",
for example convert 3600030° to 30".
Specifications:
Usable Temperature: O· C to 40· C(32°F to 104°F)
Circuitry: MOS-LSI
Power Input: 115 Volts Ale 50/60 Hz
Power Consumption: 18 Watts <?{:: 115 Volts Ale
Dimensions: 10" x 11 %" x5"
Weight: 6Ibs. 2ozs.

Addition/subtraction
Addition/subtraction-automatic repeat
Example: ENTER
TOUCH
DISPLAY
123
123
-456
789.2561
.0039
123
456
789.2561
.0039
Ie' j
I~ JO
579.26
Individual totals and summary totals
Example:
ENTER
TOUCH DISPLAY ACCUMULATE
MEMORY
8.7 +15.5 =24.2
01
U. I
::1 u ::,
,_ I .. L
9.8
5.7
5.5
3.2
9.8
5.7
5.5
3.2

Summary of examples: Simple multiplication
Chain multiolication
Multiplication with constant
multiplicand
Memory accumulation
Simple multiplication
and chain multiplication
Multiplication
Examples:
12 x 13 = 156
2 x3 x4 = 24
ENTER
12
13
5.67
2
3
4
TOUCH
DISPLAY
Memory accumulation and
constant multiplicand
Example:
12 x13 = 156
12x14=168
-(12 x15) = -180
ENTER
12
13
14
15
TOUCH
••
•••
.11
DISPLAY
-
-
-
-
-
ACCUMULATE
MEMORY
ACCUMULATED
TOTAL

Division
Summary of examples: Simple division
Chain division
Division
with constant divisor
Memory accumulation
Simple division and chain division
ENTER TOUCH DISPLAY
15 -
6-
24 -
4-
3-
15+6=2.5
24 + 4 + 3 =2
Examples:
Memory accumulation with constant divisor
Example: ENTER TOUCH DISPLAY ACCUMULATE
MEMORY
180 -
20
-
240 -
360
-
-ACCUMULATED TOTAL
180 + 20 =9
360 + 20 =18
240 +
20 = 12

PRIME USES OF MEMORY
I Accumulate keYboard entries or results
II Store keyboard entries or results
Accumulation and storage
Memory group
I. Accumulating:
(2+3) - (3x5) + (12~4) + 10=3
II. Storage:
1.265 x (1.265 +1)
~5-
ENTER
2
3
3
5
12
4
10
ENTER
1.265
5
1
TOUCH
TOUCH
DISPLAY
DISPLAY
ACCUMULATE
MEMORY
ACCUMULATE
MEMORY

Special functions
Power raising key (x to the ypower)
Examples:
12.5 1.3
12.5.
1.3
ENTER
2
5
12.5
1.3
12.5
1.3
TOUCH
DISPLAY
Reciprocal key Calculates reciprocal of displayed value.
Example:
Obtain raciprocal of 8
Calculate: 27(4
ENTER
8
2
4
TOUCH
DISPLAY
Square root key Calculates the square root of any positive value.
Example:
Compute .../156.25
ENTER
156.25
TOUCH
DISPLAY

Pi key Enters the value. TT in the display.
Example:
CompUle area of a
circle where: r=5
(Trr' )
ENTER
5
TOUCH
DISPLAY
25
Change sign key Changes the algebraic sign of the displayed value.
Example:
-7.265 x75
Calculate 4.75-
114
ENTER
1.265
15
4.75
4
TOUCH DISPLAY
Exchanges the displayed value with the value that is in the cal-
culating register. This exchange either reduces key depressions
Exchange key or the use of the memory in certain sequential calculations.
Example:
4+3
(6 x 2) +7 - 5 -.5
ENTER
6
2
7
5
4
3
TOUCH DISPLAY

Logarithmic group
Computes: Logarithms log,o and loge (In)
Antilogs lOx and
eX
COM
Set log base
NAT
Computing common logarithms 10910
Examples:
Evaluate:
The
log,0 700
The 10glO 101
The lagro .001
ENTER
100
101
.001
TOUCH
DISPLAY
Computing antilogarithms 10 x
Examples:
Evaluate:
The
antilog of 3
The
antilog of -3
The antilog of 5.5
ENTER
3
3
5.5
TOUCH
•
II
•
DISPLAY

Logarithmic group
COM
Set log base
NAT
Computing natural logarithms 10ge (In)
Examples:
ENTER TOUCH
DISPLAY
Evaluate:
The loge 1
The loge 100
100
Computing antilogarithms e'
-
,"
~ ... )1:";'-:
Examples:
ENTER
TOUCH
DISPLAY
Evaluate:
1•
4II•
12
••
-,..,
The antilog
e
of 1
The antilog
e
of 12
The antilog
e
of 4

Trigonometric group
Computes: Trigonometric functions sine (SIN) cosine (COS) tangent (TAN)
Inverse trigonometric functions arcsine (SIN-
1)arccosine
(COS-')
arctangent (TAN-')
Degrees
DEG
Set degree mode
RAD
Computing trigonometric functions
Angles expressed in degrees
Examples:
The sin of 30'
The cos of 45'
The tan of 1350
The sin of 395'
ENTER
30
45
135
395
TOUCH
DISPLAY
flll1"'1 rnc 10 (rn"'l
U. ILl I lULl ILl 1 Ie' f
Note: The signs of the trig functions
are correct and depend on the
quadrant
of the argument.
Computing inverse trigonometric functions
Results expressed in degrees
Examples: ENTER
TOUCH
DISPLAY
The arcsin .511 .511 •
II
, .. '·tjj
;"'~:;J
The arccos .9763 .9763 •
The arctan 1.0427 1.0427 •
II
12

Radians
DEG
Set radian mode
RAD
Computing the trigonometric functions
Trigonometric group
Angles expressed in radians
Examples:
The sine of. 5radian
The cosine of. 6532 radians
The tangent of .875 radians
ENTER
.5
.6532
.875
TOUCH
DISPLAY
Computing inverse trigonometric functions
Results expressed in radians
Examples:
ENTER
TOUCH DISPLAY
The arcsin 71••
The arccos .9876 .9876
••
The arctan 7.1254 1.1254 ••
<13

rictor products and services
The Series 1800 is only one of avast family
of products made by Victor, America's foremost
producer
of desk-top figuring machines.
Included in its array
of related products is a
complete range
of electronic and mechanical
display and printing calculators and adding
machines.
Other business products include electronic and
mechanical retail
point-of-sale systems,
Electrowriter and facsimile transmission systems
for business, institutional. and industrial
communications. Victor Temporaries. anational
network of company-owned temporary help
offices, make avariety
of administrative, clerical
and marketing skills available
to the business
and industrial user.
Victor is also diversified in its manufacture and
marketing
of leisure time products. Among these
are PGA and Burke golf clubs and accessories,
Daisy-Heddon sport shooting and fishing
equipment; Bear Archery equipment, Valley Pool
Tables, Ertl toys, and Nissen trampolines and
gymnastic equipment.
~VICTOR
120-82-1
ViCTOR COMPTOMETEA CORPORATION
BUSINESS PROOUCTS QIVISION CHICAGO. ILLINOIS 60618
IN CANADA: VICTOR COMPTOMETEA LIMITED • GALT, ONTARIO
Printed in U.S.A