Nortek Vector Comprehensive Manual

Also see for Vector: Quick start guide

Contents

Nortek Vector Comprehensive Manual Manual pdf 70 page image

Comprehensive Manual70© 2018 Nortek ASin the Probe Check section.3.1.5 Test Recorder Function (Vector)You can test the recorder with the same set-up as above.1) Start data collection with "Test" followed by "Start With Recorder".2) Write a name to use for the file you will record internally.3) After a few minutes, stop the data collection.4) Retrieve your data by clicking "Deployment" followed by "Recorder Data Retrieval".5) Convert it to ASCII by clicking "Deployment" followed by "Data Conversion".6) Review the collected data with an ASCII text editor (i.e. Notepad).If you leave the instrument collecting data, it will continue to run until the batteries are dead. Alwaysmake sure to stop data collection when testing is complete.It is a good routine always to start a new deployment with an Empty Memory. Before you erase therecorder, make sure that you have transferred all the data you want to retain to your computer andthat the data is in good shape. Then click Deployment > Erase Recorder.Note: The maximum number of files that can be stored in the File Allocation Table (FAT) is 31 on allNortek instruments. The "Syslog" takes one spot, so the maximum number of files withmeasurements is 30.3.1.6 Battery degaussingAll fasteners and hardware are non-magnetic and the magnetic signature of the internal electriccomponents is low. The exception is the alkaline battery pack. Therefore, the batteries aredegaussed before sending them, and also recommend the user to degauss the batteries beforeusing them.The calibration routine will compensate for magnetic masses whose field strength, and orientationrelative to the compass, do not change. If the field produced by a magnetic source close to thecompass changes significantly over the course of the deployment, heading errors may be the result.There is no need to degauss Lithium batteries.3.2 Customer CalibrationAll instruments have what we call head matrices that are unique; it describes the geometry of thesensor probe, or the transducer orientation to be more specific. The matrices are computed duringthe velocity calibration done during production. As long as the sensor probe are not physicallydeformed, the head matrices will, consequently, remain the same. Further, what is measured by thesensor is the change in frequency from the acoustic pulses sent out through the water to thosebeing reflected back. In other words, a slight change in center frequency will not affect the measuredfrequency shift, or the Doppler shift, which is entirely depending on the velocity of particles in thewater. Therefore the sensors never need to be re-calibrated for current speed and direction, unlessthey are physically deformed.3.2.1 Compass Calibration (Vector)Each compass has been calibrated at the factory to quantify the characteristic response of theindividual components and of the system as a whole. When it leaves the factory, each system canmeasure its tilt and the direction of its magnetic field vector accurately, anywhere in the world.However, users disturb the magnetic field near the instrument when they deploy. Adding a batterypack and mounting the instrument with deployment hardware adds magnetic materials that changethe magnetic field measured by the instrument. The compass calibration procedure quantifies thismagnetic disturbance, and the instrument's compass algorithm then corrects for it to obtain accurateheading.The user should perform a compass calibration just prior to deployment to correct for the introduction