"notme"

After a short phone conversation with a tech support person at Fluke, I
think
I understand the difference: it's the acquisition speed. (The new clamps
also
have triggered event feature, but that's icing on the cake.)

In the clamp meters in Fluke's present product lineup that have the
"In-rush"
feature, the acquisition speed is listed as 100 mS.

** The term actually used is "integration time " - very important .

In other words, old (model 36) meters sample 4 times a second. New (model
33x) meters sample 10 times a second (overhead aside).

** Not at all what Fluke claim.

See page 2 of this pdf.

http://assets.fluke.com/appnotes/1629920_.pdf

The 33x meters are actually sampling the current surge wave a " large number
" of times in the crucial first few cycles of applied AC power, so that the
peak value can be found.

This is quite unlike your typical DMM that *ANALOGUE * samples a DC input
voltage a few times a second - with these, an AC to DC converter ( true rms
or average rectified value ) is needed to measure any AC wave.



.... Phil