Fluke ScopeMeter 192 User's Manual Supplement page 15

Using the MS190 Function
2
Smart Average
Smart average gives you the primary waveform, but
displays an incidental trace of different waveshape directly
and without affecting the primary waveform .
You can now for example look at the averaged waveform
on an interlaced video system, and still see the fly-back
line flash by (See Figure 2-6).
When the signal changes are of more permanent nature,
the averaging algorithm automatically restarts and
displays the new waveform instantly, without displaying
the distorted intermediate waveshapes.
Figure 2-6. Smart Average
2-9