Pressing "SYS" at any time will suspend the current operation and present the user with the
main menu.
Recording
Recording is started by pressing the "REC" (Record) key while the AFRecorder is displaying
its measured AFRs. During recording, the displays will appear as shown in Figure 4.
RECORD 30/1250
AFR: 17.32
DEV: 0.80
L-R: -0.21 A: 17.43
RECORD 30/1250
AFR: 17.53
DEV: 0.81
L-R: -0.21 A: 17.43
Figure 4: AFRecorder Displays During Recording
In the four-line configuration, the upper row of each display shows the number of samples
recorded and the total number of samples to be taken. In the example of Figure 4, sample
number 30 of 1250 has been taken. An additional "hidden" sample is taken at t=0 giving an
actual total of 1250+1 samples of each AFR in this case. Up to 5,000 samples (total for both
AFR sensors) may be recorded.
In the large character display configuration, a small "R" is shown near the decimal point
during recording.
During recording, if the AFRecorder detects an AFR outside of its measurement range (λ less
than 0.40 or λ greater than 10.0), the value recorded will be the rich or lean limit and the
limit value will be used to calculate the statistics.
The recording duration, the sample interval (time between recorded samples), and the AFR
sensor(s) to record are all programmable (see Setup - Record Menu on page 18). To abort
a recording before it is finished, press "SYS", "REC", "+" or "-". If a recording session is
aborted before its programmed duration, data from the previous session and the partially
completed new session will be lost. If the recording session is allowed to complete, the
recorded data will be retained by the AFRecorder even if the AFRecorder's power is
disconnected.
Results Menu
After the recording session is completed, the AFRecorder will process the recorded data and
present the results menu (see Figure 5). The results menu can also be accessed from the
main menu (see Figure 2). By selecting "EXIT" in the results menu, the AFRecorder is
returned to the main menu. However, the recorded data remains stored in the AFRecorder
for analysis or uploading to an IBM-compatible PC.
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