I am sure that this has been asked before but a search of the manual and forum has failed to yield an answer.
I want to time between pulses in a series of pulses, but I want to catch each period. The pulse frequency may vary by a ratio of 10 (more likely to be around 3) during a measurement period of say between 5 to 20 secs. The frequency is not high, say 10 to 100Hz.
I can easily read the period between the last pulse gap, but how do I know when to do the next read? I could easily do a read faster than the max pulse frequency but then I could be attempting to read the period between any 2 given pulses more than once.
I will have two series of pulses to measure concurrently, the frequency of the two will not be directly proportional but they will follow (roughly) the same pattern of change. i.e. when one stream doubles in frequency then the other will also approximately (within say 10%) double.
For the more important data series I have considered the alternative method of counting pulses between a fixed period. The rate of change of frequency is such that I determined that this period would need to be no greater than 0.1 secs but I do have another pulse stream available that is approximately 200 times faster to get more counts per period. however, I have done an error analysis on this considering how the -i count resolution would affect the results of calculations farther down the line and the error is larger than I want. .Which is why I am looking to use the alternative method of timing between pulses rather than counting pulses in a set period. The relative resolution of counting clock ticks between pulses is much better but I do need to be sure than I am timing each pulse period.