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<br />based on the manufacturer's specifications. <br /> <br />The following subsections describe the instrumentation used for LOREP 1993. When <br />applicable, the description includes the specifications, calibration information, and the principle of <br />operation. <br /> <br />4.1 Dynamic Pressure Transducer <br /> <br />The Tavis transducer Model P-l is a variable reluctance pressure-sensing module with <br />electronic signal conditioning in a shielded housing. The transducer measures the pressure differential <br />between the static pressure port and the pitot tube (total pressure). The output is a voltage which <br />is converted to millibars by the algorithm given in Table 2. <br /> <br />Specifications <br />Range: 0 to 5 pounds per square inch differential (psid) <br />Static Error Band: :!: 0.5% F.S. max. <br />Resolution: Infinite <br /> <br />Calibration <br />Calibration in the field is not necessary. The latest calibration was performed by the <br />manufacturer in October 1990. A laboratory audit was performed in December 1992. <br /> <br />Operational procedures <br />The transducer was permanently installed and wired into the aircraft system such that when <br />scientific power was energized the instrument was operating. The instrument output was <br />tested and connected to the data acquisition system before the field study. There are no <br />inflight operations. <br /> <br />8 <br />