norbar TWC 400 AUTO Operator's Manual

Contents

norbar TWC 400 AUTO Operator's Manual Manual pdf 36 page image

34Loader CalibrationIn order to produce calibration and conformance certificates, the TWC must know about its own calibrationstate. This is managed here. In this screen you can input calibration data from both the TWC and thecurrently attached transducer’s calibration certificates. You will need to do this for every transducer you pluginto the TWC, but you only need to do this once (at least, until recalibration is required).The screen is split into the following areas:1. Direction buttons: use these to view TWC calibration state for CW and CCW directions.2. Recalibration window: when this many days have passed, the TWC’s calibration will be consideredinvalid. You may change this value to suit your obligation to systematically review the calibration stateof your TWC, per ISO 6789. The default value is 730 days, which is two years.3. Transducer data: The left side of the screen is where you enter data for the transducer; the calibrationdate from the certificate, the calibrated bottom of scale, the cert number and lab number, and theuncertainty data from the transducer.4. TWC data: The right side of the screen is where you enter data for the TWC; here you can enter thecert number, and rig uncertainty data from the TWC calibration certificate. You need only fill in thesefields if you are using an instrument-calibrated TWC and there is no overriding system calibration forthe currently attached transducer. The TWC model, serial, sys cal, inst cal, and cal state fields areautomatic and not editable.