Fluke 925 - Changing the Units of Measure; Useful Equations and Conversions; Cubic Equations

10
Changing the Units of Measure
U.S. units of measure are °F, ft/m (feet per minute), and cfm (cubic feet
per minute). Metric units are: °C, m/s (meters per second), and cms (cubic
meters per second).
1. Turn the meter on by pressing and holding both the  and the AVG
buttons simultaneously. Release the  button rst then release the
AVG button. The units of measure will appear on the LCD.
2. Press the HOLD button to select Metric and the AVG button to select U.S.
3. Press the MIN MAX button and an “S” will appear on the LCD.
4. Press the HOLD button to advance to the next selection.
5. The baud rate for PC Interface models will appear (1200 or 2400). Select
the baud rate, if necessary, by pressing the HOLD (1200) or AVG
(2400) button.
6. To return to normal operation, press MIN MAX again (the “S” will reappear)
then press and hold the HOLD button until the beep is heard.
USEFUL EQUATIONS AND CONVERSIONS
Cubic Equations
cfm (ft
3
/min) = Air Velocity (ft/min) x Area (ft
2
)
cms (m
3
/sec) = Air Velocity (m/sec) x Area (m
2
)
Units Conversion Table
m/s ft/min knots km/h MPH
1 m/s 1 196.87 1.944 3.6 2.24
1 ft/min 0.00508 1 0.00987 0.01829 0.01138
1 knot 0.5144 101.27 1 1.8519 1.1523
1 km/h 0.2778 54.69 0.54 1 0.6222
1 MPH 0.4464 87.89 0.8679 1.6071 1