v 1.04
Description
While all data are identified by channel ID values, use this description field to add a meaningful description of this data source.
Converted & Volts
These two values combine to create the scaling constant for this data channel.
The Multi-Tracer system multiplies the Aux Input voltage measurement by the conversion defined by these two values.
For example, if Aux Input channel 1, had a pyranometer connected that has a conversion constant of 1000 W/^2 at 9.85 mV, enter the following values.
Converted = 1000
Volts = 9.85E-3 or 0.00985
The system records this converted value (Vcon). This value derives from the measured value (Vm) and the above conversion constants using the following equation:
Vcon = Vm * Converted/Volts
For example, if the measured voltage were 8.394 mV, the conversion constants would return the following converted value:
Vcon = 8.394E-3 * 1000 / 9.85E-3 = 852.1
Note. The Multi-Tracer system does not enforce any form of units on this conversion.
If no scaling is required, enter values of 1.0 for both values. Or, for example, if you wanted to record mV instead of volts, enter 1000 for the converted value and 1.0 for the Volts. These values multiply the measurement by 1000 (converting from volts to mV).
Offset
The offset is added to the converted value. The complete conversion equation is:
Vcon = ( Vm * Converted/Volts ) + Offset.
Note: The Offset is applied AFTER the scaling and is therefore in converted units.
Units
The units field is a user defined text value. It does NOT affect calculaitons. Use this field to add a meaningful description of units of the converted value. For example, for a value that represents irradiance you could enter "W/M^2" or "kW/m^2".