For EMF-380 V2 and EMF-390 (and possibly other models), what is the minimum time span of the signal pulse in the general RF field spectrum for it to be measured (or registered) on the screen and in the data log? For example: Cornet's ED88T PLUS specs state their device has sampling rate of 10,000 per second and can capture signal bursts as short as 100usec (0.1ms).