Setra System Model 370 - Manual (Page 25)

Section Five
DISPLAYING ALTITUDE
The Model 370 Digital Pressure Gauge can be used to display a variety of
altitude measurements. It may be used as an altimeter calibrator, a standard
altimeter, a true corrected altimeter (self corrected or remote), or as a relative
altimeter. It may be used to indicate small relative changes in altitude
through the use of the zero/tare function.
This function is only available on gauges having absolute or barometric
pressure sensors.
5.1 ALTIMETER CALIBRATOR, STANDARD ALTIMETER
To indicate standard altitude with the Model 370, follow this procedure.
1. Clear the zero/tare register by pressing "-" then ZERO.
2. If the display is in "SEA LEVEL" press f(p) so that it is not in
sea level mode.
3. Press CONV until the display is in "feet" or "meters".
The gauge is now displaying altitude as a function of the Standard Atmosphere
Curve. For a copy of the data which describes the Standard Atmosphere,
consult: NACA Report 1235, or "Smithsonian Meteorological Tables, Vol. 114".
Note: This display of standard altitude will not coincide with the actual
elevation. See the next section, "Displaying True Altitude" in this guide.
19