● Setup - Outputs - Analog
The choice of "ANALOG" from the setup - outputs menu allows the setting of the analog
voltages output by the AFRecorder for the values of air-to-fuel ratio (including the offset, see
AFR Measurement Offsets on page 22) measured.
The analog outputs are a linear function of the measurements in their displayed units between
the values entered for 0 V and 5 V. For example, if the 0 VDC output for AFR (in AFR
units) were programmed as 10 and the 5 VDC output as 15 then a voltage output of 1 Volt
would result from a measured AFR of 11 if the displayed units were AFR. The analog
outputs are updated every 0.01 seconds. See the Output Specifications and Limits section
on page 36 for more information.
● Setup - Outputs - Sim EGO
The choice of "SIM EGO" allows the setting of the AFRs at which the simulated exhaust gas
oxygen (EGO) sensor outputs transition from their low (approximately 0.02 V) states to their
high (approximately 0.8 V) states (or vice versa). A low output means that the AFR is leaner
than its programmed value and a high output means that the AFR is richer than its
programmed value. The simulated EGO sensor outputs are updated every 0.01 seconds.
Separate simulated EGO switch threshold values are maintained for each of the AFR units
choices (AFR, φ or λ).
● Setup - Outputs - Cal D/A
The choice of "CAL D/A" allows the calibration and the verification of the accuracy of the
D/A (digital to analog) conversion process of the AFRecorder. If this option is selected, the
AFRecorder will calibrate its analog outputs with respect to its internal voltage reference and
will hold the analog outputs at 1 V and 4 V so that they may be verified externally.
Setup - Options Menu
The choice of "OPTIONS" from the setup menu allows the activation of AFRecorder
functions (see Figure 12). Selecting "EXIT" from this menu will return the AFRecorder to
the setup menu.
SETUP - OPTIONS
1 ICC 3 DEFAULTS
2 SOUND 4 EXIT
Figure 12: The Setup - Options Menu
Stand-Alone Operation 19
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