On selection of this option, AFRemote requests the sample interval (allowable values: 0.1 to
60 sec.), the sample size (allowable values: 100 to 100000), and the filename. It is
recommended that the filename extension .AFR be used.
During real-time to disk operation, the PC's display is updated with every fifth data point for
sample intervals less than 0.13 seconds, with every other data point for sample intervals
between 0.13 seconds and 0.25 seconds, and with every data point for sample intervals
greater than 0.25 seconds. Note that this data is not averaged as it is for the options "Real-
Time Display" or "Draw Real-Time Plot". The AFRecorder's display will not show data for
sample intervals less than 0.34 seconds.
Should the "Esc" key be pressed during real-time to disk operation, the process is terminated
and the file is closed with the data collected up to the time when the "Esc" key was pressed.
The data is stored in a compact format ("AFRemote format") suitable for re-input and
analysis by AFRemote. If the data is to be input into another data analysis program, it must
be stored in ASCII format by selecting "File" followed by "Create Export File". A filename
will be requested and it is recommended that the filename extension .EXP be used for these
files. Note that ASCII files cannot be loaded into AFRemote for plotting and analysis, only
files stored in the compact format. It takes much longer to store data in ASCII format than it
does in AFRemote format.
Figure 19 is an example of an "exported" file. The time and recorded measurements are
always stored as five columns. The columns contain, from left to right: time, AFR_L,
AFR_R, L-R, and AVG. The data is separated by tabs.
0.000 15.125 14.419 0.706 14.772
0.100 15.239 14.761 0.478 15.000
0.200 15.466 14.073 1.393 14.770
0.300 15.693 14.965 0.728 15.329
0.400 15.352 14.247 1.105 14.800
0.500 15.012 14.815 0.197 14.914
0.600 15.125 14.848 0.277 14.987
0.700 15.806 14.978 0.828 15.392
0.800 16.260 14.195 2.065 15.228
0.900 16.407 14.971 1.436 15.689
1.000 15.466 14.458 1.008 14.962
1.100 13.874 14.499 -0.625 14.187
1.200 13.375 14.864 -1.489 14.120
1.300 13.519 14.097 -0.578 13.808
1.400 13.925 14.587 -0.662 14.256
1.500 14.077 14.061 0.016 14.069
. . . . .
. . . . .
. . . . .
Figure 19: An Exported Data File
Each row contains the measured values at the time given in the first column. Note that data
begins at time zero (0). All parameter values are stored, even if one AFR sensor was not
used. If an AFR sensor was not used then its rich or lean limit will appear in that parameter's
column.
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