Pressure measurement in air data instrumentation

The study was concerned with pressure measurements insofar as they affect such key output quantities as altitude, calibrated air speed, and Mach number. Absolute and differential pressures are determined for three ranges of tolerances: greater than 0.5 mbar, between 0.5 and 0.2 mbar, and below 0.2 mbar. Using these data, a fully automated pressure test module has been constructed with precise control of dynamic pressure characteristics, the ability to control environmental tests from the software, and the ability to interrupt the program, scan data, and execute additional tests from the keyboard and return to the program.