85 - 



C. Bench Calibration 



1,. The Calibration Technique 



An extremely simple calibration was first considered to 

 statically determine the static response of the transducers to a 

 known load. The isolation diaphragms were positioned facing upwards 

 and were loaded with known weights. This technique was ineffective 

 because of the 

 physical nature 

 of the dia- 

 phragms . The 

 bottoms of the 

 weights were 

 rarely in full 

 contact with 

 the elastomer, 

 as is depicted 

 graphically in 

 Figure V-2, so 

 that the ap- 

 plied pressure 

 to the sensor 

 could not be 



easily calculated. If the weight was too heavy and large, some of 

 the force of the weight would be exerted upon the top face of the 



FIGURE V-2: Cross-section of isolation dia- 

 phragm with an object load applied. 



