I don’t think that there’s a specification for the variance of actual wake-up times, but I’m wondering if there are any measurements that have been done. I’m finding devices with, say, a wake up time of 7200 seconds not waking up for for > 7500 seconds.
Is this size of error expected? If it is, do I have to characterise devices based on my own calibration, or are manufacturers compelled to provide measurements as part of the compliance testing?
I can imagine that it’s a pita trying to test for such variance (you’ve got to get statistically significant measurements of data with an effective measurement rate of, say, one data point per day).
For background, I’m trying to establish the probability that a device is dead/not contactable, so that, for instance, I don’t expect a motion detector to detect motion if it’s effectively offline.