All makes a lot more sense.
It would appear, then, that the Mooshimeter is not capable of picking up the small spikes as they will be lost in the averaging.

Do you think there is a way to get around the averaging ? Modification to Mooshimeter ?

Would another multipmeter be better ?

Or, is the only alternative an oscilloscope – unfortunately to measure votage and curent at the same time will be expensive – current probe ?

Kind regards

Michael