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Chapter 14: Inputs- Using
Air/fuel ratio meter connection (DTec ‘WB2’ unit as example)
DYNertia3 can interface with any Air Fuel Ratio (AFR) meter that has an analogue output, as most do. The meter itself
should be powered directly from the DYNertia3 battery as they draw considerable current to operate the oxygen sensor
heater element (keep an eye on battery voltage as they can flatten batteries quickly!)
Many common AFR meters are already pre-calibrated in DYNertia3 software; you just choose the correct one in the
‘Setup’ menu under ‘Sensor Configuration’ to let DYNertia3 know. If not, then you can easily create your own settings as
long as you know from the manufacturer what output voltage equals what AFR/Lambda mixture, this is covered at end of
chapter.
Note: Some AFR meters have ‘differential outputs’ (i.e. 2 isolated outputs not connected to the meters power supply
ground) so the negative output must be connected to a DYNertia3 ground (0V). Some AFR meters just have a single
output wire to connect; their output is referenced to the meters power supply ground.
Note: Do not reverse the AFR meter connections. 12V may be fed in 0V pin and damage DYNertia3.
Connection of load cell for brake (absorber) style dyno’s
Only input channel 5 can be used as torque input from a load cell (preset in software). If the input is greater than 5V
then set the voltage range switch to 0-15V. The sensor must be calibrated properly, see ‘Load Controller’ in this manual
and check the settings in the ‘Setup’ menu under ‘Sensor Configuration’; this is covered at the end of this chapter.
Note: load cells produce only tiny voltage changes so will need an additional amplifier (transmitter) to create a usable
voltage output. DTec sell a unit that incorporates additional filtering for improved performance on dyno applications.
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