Drew Technologies DASHDAQ-XL - Manual (Page 34)

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DashDAQ comes preloaded with both Analog Inputs. If you needed to reinstall,
you’d use Device Manager to install Analog Input in an available slot
Then you’d specify either Analog-1 or Analog-2. To read both, just load the driver
twice in two different slots.
LINEAR ANALOG DRIVER CORRECTION FACTOR AND CORRECTION OFFSET
If you have an Innovate LC-1 wideband controller and you’d prefer to see an Air-Fuel ratio instead of a raw voltage. DashDAQ is able to
convert a linear raw voltage signal into physical units using the following formula:
Corrected Value = Correction Factor * Raw Voltage + Correction Offset
This procedure will help you find values for Correction Factor and Correction Offset. The LC1-1’s instruction manual says that its 0-5v
analog output represents AFR=7.35 to AFR=22.39. With that information you can setup two equations:
(Correction Factor * 0v DC)+ Correction Offset = 7.35
(Correction Factor * 5v DC) + Correction Offset = 22.39
Using the correction factor 7.35, you solve the second equation and determine:
(Correction Factor * 5v DC) + 7.35 = 22.39 (subtract 7.35 from 22.39)
(Correction Factor * 5v DC) = 15.04 (divide 15.04 by 5)
(Correction Factor) = 3.008
With this procedure and two known-values, you can determine the Correction Factor and Correction Offset for most automotive
sensors. Refer to the sensors user manual for Correction factor and offset values.
CONVERTING AN ANALOG VOLTAGE INTO PHYSICAL UNITS
Navigate to “Parameters” by tapping on [Setup] from the Main Menu, then [Devices], then [Parameters]. Use the arrows at the top to
find the analog input you would like to scale.
Setting parameters for an analog input