Is the ECHO Probe compatible with my datalogger?
As much as we’d like to, we cannot test the ECHO probe with every datalogger that you could plug it into. The ECHO probe requires an excitation of 2 to 5 V at 3 mA for approximately 5 to 10 milliseconds. Although longer excitation times will not change probe output, Decagon does not recommend that the probe be constantly excited. The output of the probe is approximately proportional to the input; 10 to 40% for 2.5 V excitation and 10 to 35% for 5 V excitation. We use 2.5 V excitation for all of our probe calibration so excitation voltages other than 2.5 V will require separate calibration by the user.
