Calculated Industries 4090 User Manual

Page 3

2 — ITI S

HEET

ETAL

/HVAC P

KEY DEFINITIONS ............................................................................6

BASIC OPERATION KEYS .............................................................6
CONVERT

Ç KEY—UNIT CONVERSIONS and

SECOND FUNCTIONS................................................................6

MEMORY and STORAGE FUNCTIONS ........................................7
RECALL

® KEY ..........................................................................8

FEET-INCH-FRACTION and METRIC KEYS .................................8
TRIGONOMETRIC KEYS ...............................................................9
PYTHAGOREAN THEOREM/RIGHT TRIANGLE KEYS ..............10
LAW OF COSINES/NON-90 DEGREE TRIANGLE KEYS ...........12
OFFSET KEYS..............................................................................13
FAN LAW KEYS ............................................................................14
VELOCITY PRESSURE/FPM KEYS ............................................15
CIRCULAR/ARC FUNCTION KEYS .............................................15
COLUMN/CONE KEY ...................................................................16
HIP/VALLEY and JACK RAFTER KEYS.......................................17
STAIR KEY....................................................................................19

GETTING STARTED........................................................................21

ORDER OF OPERATIONS ...........................................................21
USING PARENTHESES ...............................................................22
SETTING FRACTIONAL RESOLUTION.......................................23

Setting Fraction Resolution to Other Than 16ths —

Using the Preference Setting Mode .......................................23

Setting Fixed/Constant Fractional Resolution............................24

ENTERING DIMENSIONS ............................................................25

Entering Linear Dimensions.......................................................25
Entering Square/Cubic Dimensions ...........................................25

CONVERSIONS (LINEAR, AREA, VOLUME) ..............................27

Linear Conversions ....................................................................27
Converting Feet-Inch-Fractions to Decimal Feet .......................27
Converting Decimal Feet to Feet-Inch-Fractions .......................27
Converting Fractional Inches to Decimal Inches .......................27
Converting Decimal Inches to Fractional Inches .......................28
Square Conversions ..................................................................28
Cubic Conversions .....................................................................28

PERFORMING BASIC MATH WITH DIMENSIONS....................29

Adding Dimensions ....................................................................29
Subtracting Dimensions .............................................................29
Multiplying Dimensions ..............................................................29

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