UNCLASSIFIED 



DOCUMENT CONTROL DATA -R&D 



NAVAL ELECTRONICS LABORATORY CENTER 



for Command Control and Communications 



San Diego, California 92152 



UNCLASSIFIED 



COMBINED -ENVIRONMENT TESTING OF SHIPBOARD ELECTRONIC EQUIPMENT 



I. DESCRIPTIVE NOTES (Type ol report and inclusive dales) 



Research and Development Report October 1967 to January 1968 



F. Robinson 



18 March 1968 



NO. SF 013 14 04, 

 Task 5788 

 (NELC R114) 



1546 



This document is subject to special export controls and each transmittal to 

 foreign governments or foreign nations may be made only with prior approval 

 of the Naval Electronics Laboratory Center, San Diego, California 92152. 



Naval Ship Systems Command 

 Department of the Navy 



Lack of improvement in reliability of operational shipboard electronic equipment 

 over some years has led to an investigation of present test methods. This report 

 shows that the method presently used for subjecting electronic equipment to environ- 

 ments in sequence fails to simulate actual environmental conditions and to subject 

 the equipment to the synergistic (interacting) effects of the environment. 



A combined-environment test consisting of 27 combinations of temperature, 

 humidity, and vibration is applied to several specimens of an if/ am amplifier 

 module to verify the presence of synergistic effects, and these effects are shown to 

 contribute to deterioration in performance. 



The development of a standard combined-environment test procedure is 

 recommended. 



DD,r:„1473 



S/N 0101-807-6801 



UNCLASSIFIED 



Security Classific 



