How to test accuracy and functionality of temperature and speed data output by Actisense DST-2

Article HD25071, May 26, 2015

A DST-2's output of temperature and speed may be tested using an Actisene USG-1 connection to NMEA Reader on a Windows computer.


If you have doubts about the accuracy of temperature readings coming from the Actisense DST-2, a test outside of your NMEA network is suggested.

Put a 10K ohm resistor across the two temperature terminals of the DST-2 unit. On a computer connected to the DST-2 (via Actisense USG-1 gateway) use the NMEA Reader to evaluate the NMEA 0183 data streaming in. The NMEA Reader should show a temperature of 25 degrees Celsius corresponding to a 10K resistance. A value near or at 25 C is a confirmation that the DST-2 is in good working order.

If you have doubts about the accuracy of speed readings coming from the Actisense DST-2, another text outside the network is suggested.

A suitably equipped marine installer will have a signal generator able that produces a 50 Hz square wave (0 to 5 volts) between the Log input and Log ground. Feed that signal into the DST-2 module and then have the data tapped into by a computer running NMEA Reader (using an Actisense USG-1 gateway as the intermediary between computer and DST-2). The DST-2 should show a speed of 10 Knots for the test parameters of 50 Hz square at 0 to 5 V; that would confirm the DST-2 is in good working order.