Posted 6/16/2006 10:15 (#19859 - in reply to #19800) Subject: Re: One more AgLeader 2000 question
The application of the calibration to the logged data is done in the computer at the time the data is read from the file... and not in the monitor. According to the Ag Leader patent, the .yld files log sensor pulses into each of the C ranges. And in the header of each .yld file (the first 128k bytes) the C numbers from the most recent monitor calibration are stored. The header of each .yld file also contains the total season summary, with any actual weights that you have recorded. That's what is used in the calibration process.
So, you might archive 5 card images during the course of the season, but the .yld file that you finished up with will contain a copy of the summary information for the entire season (with your actual weights). And, it is the summary info that is used in the AgLeader recalibration process. That would make the last .yld file have the best set of numbers, typically. Then, in the office, when you read the 5 archived card images, the software will use the calibration numbers from the last .yld file (by default) and apply it to the logged pulses from all of the earlier files, giving you post-calibrated data.
I posted this in reference to your statement that you could put the files back into the monitor for calibration. It is not necessary to reload the files to get the latest calibration applied to the older data if you are using software that supports applying calibrations from one file to the gps data that was logged earlier into another file. And I think all of the commonly used software does support this.