About the Actisense DST-2 and its DST Smart Calibration Utility
Article HD25106, September 8, 2015
Actisense DST-2 features and notes on the DST Smart Calibration Utility.
Analogue to Digital Conversion using the Actisense DST-2
- Depth transducers : 3-wire piezo-electric crystal connection type, outputs NMEA 0183 sentences DBT & DPT.
- Speed transducers : 3-wire hall-effect paddle-wheel connection type, outputs NMEA 0183 sentences VHW & VLW, but only after detection (of at least three pulses from the paddlewheel after power-up). Once detected, any periods that the paddle-wheel is stationary for will be correctly communicated as a zero speed in VHW.
- Temperature transducer : 2-wire thermistor connection type, outputs NMEA 0183 sentence MTW, but only after detection.
- Only outputting Speed and Temperature data after detection prevents confusing transmissions when a transducer is not connected.
- The available frequencies of 150, 170 and 200 kHz need to match the frequency of the Depth transducer.
- Flash upgradeable to allow in-the-field updates via ActiPatch.
- Comprehensive Calibration Utility that allows the DST-2 to be calibrated to work with a large range of transducers.
DST Smart Calibration Utility Usage
- Connect a computer's USB port to the DST-2 via Actisense USG-1 or a similar USB to device connector.
- In the Smart Calibration Utility, select the virtual COM port receiving data from the DST-2. If available, a COM port to an NMEA 0183 GPS source is recommended when calibrating a speed transducer since the GPS data can be used to automatically build up a speed correction curve.
- The bottom section that displays the NMEA 0183 data coming from each open COM port is visible on all tabs.
- The Depth tab displays the current depth values received from the DST-2 and also offers the option to specify a Depth Offset either as a positive Depth Below Surface offset or as a negative Depth Below Keel offset.
- The Speed tab displays the current speed calibration curve and offers the options to specify up to a 10-point speed calibration curve. As already touched on, this 10-point curve can be auto-calculated based on GPS data.
- The Temperature tab displays the current temperature value and offers the option to specify a temperature offset to correct basic errors in the chosen thermistor transducer.
- The GPS and Reference tabs are display helpful information.
- The Tools tab allows the user to understand what NMEA 0183 sentences are currently coming from the DST-2 and GPS, plus it offers a convenient method of recording the NMEA 0183 data to a file.
Tabs of the Software