Windows Software Reference (Single Chamber Mode)
8-11
Port Setup: V1 (V2, V3, V4)
The V1, V2, V3, and V4 windows are the areas in which you can input the
coefficients for linear external input devices connected to the Auxiliary Sensor
Interface box. There is a General Purpose Input, Thermistor input, and a dedicated
input for the Decagon EcH
2
O or Delta-T Theta soil moisture probes that can be
monitored on any of V1, V2, V3, or V4 voltage channels.
Enter the slope and offset values (obtained from the manufacturer) for each device
attached to the voltage inputs. If Thermistor Input is selected, the page changes to
show input fields A, B, and C, for thermistor calibration coefficients; the thermistor
temperature calculation is of the form
T (°C) = 1/[A + B*(ln R) + C*(ln R)
3
] – 273.15
NOTE: If a soil moisture probe is connected, the probe is automatically powered
for about 10 seconds to allow it to stabilize, before it is sampled.
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