Nortek DVL 1000 300m Manual

Nortek DVL 1000 300m Manual Manual pdf 17 page image

Preparation 17© 2017 Nortek AS5.2 Before MissionWith the previous sections of this chapter successfully completed you are now ready for your finalpreparations before deployment.It is vital to remember to connect the dummy plug in case the connector is not to be used, toprotect it. Before mating, ensure that the connectors are dry and free of debris, look for waterinside the female connector.When properly mated, the engaging nut on the cable plug will thread smoothly onto the receptacleshell until it rather abruptly reaches a point where it cannot be hand-tightened any further. At thispoint the mating surfaces of the plug and receptacle are in contact, and have formed a good seal.The amount of force required to tighten the engaging nut should stay the same throughout (up untilthe point where it cannot be further hand-tightened). Otherwise, the connectors are not matingproperly and will not form a good seal.We recommend starting new missions with an empty recorder if you plan to store data internally.Before you erase the recorder, make sure that you have transferred all the data you want to retain.Set a pressure offset. The DVL measures absolute pressure. The pressure offset selected is thepressure reading for offsetting absolute to relative pressure. Atmospheric pressure is typically 10.0dBar, while factory setting is 9.5 dBar to get non-zero readings out of water. Change this offsetthrough the web site (under Instrument settings - see screenshot below).Online connectors should be lubricated with silicone spray.The Mounting Angle should be set to the non-zero value if the the DVL's X direction is differentfrom the vehicle's or INS's forward direction. See the section on Coordinate System for furtherclarification.