MONARCH INSTRUMENT ACT-3X, Руководство пользователя и справочное руководство

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3) Suppose we have wheel of d inches in diameter. This wheel turns the tire on a motor vehicle. We get one pulse into the
tachometer for each revolution of the drive wheel. We want the display in miles per hour. We ignore slip.
NOTE: For more than one pulse per revolution, simply divide the scale factor you get for one pulse by the number of actual
pulses per revolution.
Scale Factor of Comment Scales Display To
(π x d‖)
circumference of wheel inches per second
(π x d‖) ÷ (5280 x 12)
1 mile = 5280 feet miles per second
12 inches = 1 foot
(π x d‖) ÷ 63360
multiply out miles per second
(π x d‖ ÷ 63360) x 3600 1 hour = 3600 seconds
miles per hour
0.1785 x d multiply out miles per hour
To enter the actual scale factor into the tachometer, do the following:
Turn the tachometer on. Assuming there is no input, the display will show

. Press the
SET
button until the display shows

. Press the SET button again and the unit will display its current mode of operation. Press and release the UP

button
until the display shows

, and then press the SET button. The display will show the current scale factor value with the
right-most digit flashing. The UP

and DOWN

buttons change the flashing digit. The
RESET
button moves the flashing
digit and RESET + DOWN

moves the decimal point. Using these buttons, alter the value to indicate the scale factor you
want. Once you have the scale factor as desired, press the SET button. Press the RECALL button twice to get out of the Menu.
Note that all limits and outputs work in the absolute displayed value. Thus, if you have entered a scale factor to display in yards
per minute, then the limit display and setting will be directly in yards per minute.
APPENDIX B
– USEFUL CONVERSIONS
Multiply By To Get
Inches 2.5400 Centimeters
Centimeters 0.3937 Inches
Inches 0.0254 Meters
Meters 39.3700 Inches
Feet 30.4800 Centimeters
Centimeters 0.2381 Feet
Feet 0.3048 Meters
Meters 3.2810 Feet
Yards 0.9144 Meters
Meters 1.0940 Yards
Miles 1.6090 Kilometers
Kilometers .6214 Miles
Miles 1609.0000 Meters
Meters 6.214 x 10-4 Miles
Miles 160900.0000 Centimeters
Miles 5280.0000 Feet
Furlong 66.0000 Feet
Knots 6080.0000 Feet/Hour
Knots 1.1520 Miles/Hour