as a result of the variety of components which go to make up different equipments. 

 For instance, one type of electronic equipment may contain components that are 

 susceptible to all the environmental factors; however, another type may contain 

 components which are susceptible only to vibration-temperature and temperature- 

 humidity interactions and insusceptible to the humidity-vibration interaction. 

 This should not be construed to imply that the interaction of humidity and vibra- 

 tion is not essential in combined-environment testing, nor should any environ- 

 mental factor be discounted because it did not affect a piece of electronic equip- 

 ment during a specific combined-environment test. 



The important point is that these additional detrimental effects are 

 present in combined environments and they have an opportunity to influence the 

 failure rate and performance of shipboard electronic equipment. 



In summary, synergistic effects have been shown to exist in combined 

 environments and to have contributed to the degradation in output power of an 

 if/am amplifier module. Furthermore, it is quite apparent that synergistic effects 

 are essential to environmental testing of shipboard electronic equipment and 

 should be seriously considered in it. 



TABLE 8. ESTIMATES OF OUTPUT POWER FROM REGRESSION EQUATION. 



Temperature, 



op 



Relative 

 Humidity, 



% 



Vibration , 



g 



Observed 



Output, 



mW 



Estimated 

 Output, 



mW 



Difference, 



mW 



50 



93 



2.00 



1.14 



0.97 



0.17 



50 



93 



0.50 



1.04 



0.97 



0.07 



50 



35 



1.25 



1.12 



1.03 



0.09 



86 



65 



1.25 



0.79 



0.74 



0.05 



122 



65 



1.25 



0.45 



0.38 



0.07 



122 



35 



2.00 



0.52 



0.45 



0.07 



122 



93 



1.25 



0.40 



0.33 



0.07 



86 



93 



0.50 



0.88 



0.72 



0.16 



86 



35 



0.50 



0.85 



0.80 



0.05 



50 



65 



1.25 



0.98 



0.99 



-0.01 



86 



65 



2.00 



0.77 



0.73 



0.04 



122 



65 



0.50 



0.36 



0.40 



-0.04 



16 



