Output Specifications and Limits
Analog Outputs:
• Programmable Ranges for: Air-to-Fuel Ratio (in AFR, φ, λ) or %Ο
2
of each AFR
sensor.
• Output Range (linearized in displayed units): 0 - 5 VDC. 20 mA max.
• Bits Resolution: 12 bits.
• Update Rate: 0.01 seconds.
• Connector: Female DB15 (Model 4800R only).
Pin 1: Left Air-to-Fuel Ratio (in AFR, φ, λ, or %Ο
2
)
Pin 2: Right Air-to-Fuel Ratio (in AFR, φ, λ, or %Ο
2
)
Pin 3: Signal Ground
Pin 4: Left Simulated EGO Sensor
Pin 5: Signal Ground
Pins 6, 7, 8, 9, 10: Not connected
Pin 11: Right Simulated EGO Sensor
Pins 12, 13: Signal Ground
Pins 14, 15: Not connected
• Connector: Female DB9 (Model 4800P only).
Pin 1: Left Air-to-Fuel Ratio (in AFR, φ, λ, or %Ο
2
)
Pins 2, 4: Not Used
Pin 3: Right Air-to-Fuel Ratio (in AFR, φ, λ, or %Ο
2
)
Pin 5: Signal Ground
Pin 6: Right Simulated EGO Sensor
Pin 7: Left Simulated EGO Sensor
Pins 8, 9: Signal Ground
All outputs must be measured relative to the signal ground pin(s) on the connector. In the
case where the AFRecorder and an external data acquisition system are both powered by the
same 12 VDC battery (Model 4800P only), then the inputs of the data acquisition system
must be set up in differential mode. If differential mode is not available and single-ended
mode is used, be aware that an approximately 10 mV potential exists between the 12 VDC
power source ground (measured at the battery) and the signal ground (measured at the
outputs connector). Single-ended inputs of some data acquisition systems will tie the signal
ground to the power supply ground. This will not cause any problems with the AFRecorder
but its effect on the data acquisition system must be considered.
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