I've never programmed a PIC, nor do I know much about TI measurements. But, if you wanted 100 ps resolution, would it make sense to average five 125 samples?
thanks, glenn Richard H McCorkle wrote: >By selecting a known sample time for the XO speed used, the LSB >of the displayed data has a known time value. By default the 60-second >sample period gives an LSB of 1.04ns. No dividing by the sample time >or other scaling needs to be done to the count displayed, it is already >scaled by the XO speed and sample time used. By changing the >sample time to calibrate the reading, the count can be scaled to read >directly. For instance, accumulating 625 samples with a 16 MHz XO >speed would result in a count with an LSB of 100 ps. Since the Simple >Time Interval Counter only goes to 256 samples, averaging 250 samples >would give an LSB of 0.25ns and an output count displayed once every >4:10. An LSB value of exactly 1ns would require 62.5 seconds per >update. Because partial sample times aren't allowed, a 60-second >value was chosen as default giving an LSB of 1.04ns and an output >count displayed once per minute. > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
