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The instrument was calibrated twice; once with the 1/8 inch 

 arm and 1/16 inch I.D. center inflexible tubing used at CERC, and 

 two weeks later, with the 1/8 inch I.D. flexible tubing used on the 



Stn 



DPG Transducer Stack 



Pressure Chambers 



FIGURE V-3: The DPG bench calibration system. One pair of sensors 

 shown for clarity. 



final instrument installed at the FRF, Duck, NC. Early during the 

 first calibration, one of the chamber transducers failed. This meant 

 that only one side of a differential transducer could be loaded at a 



