FIELD PREPARATION AND TESTING OF THE INSTRUMENT 

 March 1974 - May 1974 



After testing of the instrument at Scripps Pier it was modified for 

 field use and tested in the ocean under differing wave conditions. Most 

 of the modifications necessary to make the instrument ready for field use 

 involved enclosing the three and one-half digit panel meter (Analog 

 Devices Model AD2001) in a splash-proof box and to arrange a small 12- 

 volt wet cell and 5-volt power supply for it. This part of the instru- 

 ment became the recording package of the instrument. 



Use of the instrument involves dropping the sensing package on a 

 station with a marker float attached to its recovery line. After a 

 3-minute sampling period the sensing package is recovered and the record- 

 ing package plugged into it to read the retained measurement. Once the 

 measurement has been read, the reset switch is activated to prepare the 

 sensing package for another measurement . 



In April and May 1974 the instrument was field tested in the ocean 

 off Scripps Institution and at Indian Canyon Range. The results of 

 these tests are shown in Figure B-5. At present the instrument is work- 

 ing properly and is available for field use. 



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