Teledyne LeCroy LabMaster 9Zi-A - Manual (Page 123)

Getting Started Manual
922157-00 Rev A 115
Pre-Processing Controls
Pre-Processing is meant as before Math processing. Pre-Processing controls
provide the following functions for your respective channel:

Averaging - Specifically performs continuous averaging or the
repeated addition, with unequal weight, of successive source
waveforms. It is particularly useful for reducing noise on signals
drifting very slowly in time or amplitude. The most recently acquired
waveform has more weight than all the previously acquired ones:
the continuous average is dominated by the statistical fluctuations
of the most recently acquired waveform. The weight of old
waveforms in the continuous average gradually tends to zero
(following an exponential rule) at a rate that decreases as the weight
increases.

Deskew - Adjusts the horizontal time offset by the amount entered.
The valid range is dependent on the current timebase setting. Pre-
processing deskew and the Math deskew function perform the same
activity.

Invert - Invert the waveform for the selected channel.

Cable De-Embedding - When making measurements on serial data
signals, losses in the cables used in the test setup can reduce the
accuracy of your signal (for example, signal amplitude and risetime),
as well as introduce Inter-Symbol Interference. These cable effects
can dramatically alter your serial data measurements and potentially
create mask test violations. The Cable De-Embedding option allows
you to quickly specify the characteristics of the cables (typically