temperature was being lowered. After about 4 hours, the BP&CL was pulled from the tank and 

 operated in air to find the rebars. The water temperature was about 34° F with ice beginning to 

 form at the surface. No operational problems were encountered during these tests. 



To verify the high temperature operating and storage thresholds in the TEMP (85 °F and 

 140°F, respectively), tests of the BP&CL were performed with the tool submerged in a tub of 

 warm water after sitting outside (in direct sunlight) while packaged inside its storage container. 

 To monitor the temperature inside die container, both a diermometer and a thermocouple (with 

 digital readout) were placed inside the contain. With the ambient air temperature (in the shade) 

 at approximately 82°F, the temperature inside the box eventually reached nS'F. The BP&CL 

 was then taken from its storage container and placed in a tub of warm water (approximately 

 90°F) for about 20 minutes. The BP&CL was dien turned on inside the tub of water and then 

 pulled out and used in air to locate rebar laid on the ground. No operational problems were 

 encountered during these tests. 



USER TESTS 



To verify the suitability of the tool for UCT use, user tests of the modified Forster Ferex 

 system were performed offshore Anacapa Island by the NCEL dive locker. Although these tests 

 were originally scheduled with UCT-TWO (and NCTC Delta Company as a backup), fleet 

 scheduling conflicts required using the NCEL dive locker to avoid further schedule delays and 

 additional project costs. Reference 4 authorized NCEL to conduct the user tests with in-house 

 personnel previously stationed with either UCT-ONE or UCT-TWO. These tests were performed 

 in March 1988. 



The test consisted of divers using the BP&CL (in the diver-held mode) to find a 10-foot 

 section of 1.5-inch chain placed on the seafloor. The chain was placed about 100 feet away from 

 the dive station (LCM-8 boat) in about 45 feet of water. The sea conditions were considered 

 good, with 10 feet of visibility, no current, and a water temperature of 65 degrees. 



Prior to beginning the dive, the operators received a 15-minute instruction on how to use 

 the BP&CL (both divers were unfamiliar with its use). Upon reaching the bottom, the divers 

 determined which course to take by using the audio and visual output of the BP&CL while 

 making a 360-degree turn. This procedure was repeated after traveling a short distance (about 

 30 to 40 feet) until the chain was found. The total time on the bottom actually searching for the 

 chain was about 5 minutes. 



Comments from the divers indicated that the BP&CL meets the operational effectiveness 

 and operational suitability thresholds stated in the TEMP. One problem mentioned was the loss 

 of the audio output signal while adjusting the frequency control. This problem will be solved 

 by substituting the switch with a "make before break" type. 



CONCLUSIONS 



The EDM test results show that the BP&CL has met or exceeded the TEMP thresholds. 

 Table 9 shows TEMP thresholds and summarizes test results. 



The reliability thresholds were met with a confidence factor of 90 percent. There were 

 only two minor incidents observed during this portion of the test and neither would prevent the 

 unit from performing its mission. The test battery life of 43 hours was judged to be in excess 



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