Setting Hysteresis; Local Parameters - LeCroy WaveMaster 8600A Operator's Manual

The following table summarizes the determination of the local baseline and its separation when the
local feature is and is not the last identified before the right parameter cursor:
Local baseline and local baseline separation if last local feature
Baseline identified
peak-to-trough (PTBase)
yes
no
Local baseline and local baseline separation if not last local feature
Baseline identified
peak-to-trough
(PTBase)
yes
yes
no
no

Setting Hysteresis

Hysteresis must be set for all local parameters. The determining factors for a hysteresis value are:
The maximum peak-to-peak noise in the waveform
1.
The minimum local feature amplitude
2.
The value should be somewhere between the first and second factors to ensure that noise is not
mistaken for a local feature, and that all local features are recognized.

Local Parameters

The local parameters group offers measurements of common disk drive waveform parameters.
Local Parameter
lbase
lbsep
lmax
WM-OM-E Rev I
Local Baseline
(PTBase + [PTBase + previous
separation])/2
midpoint of local peak and
trough
Baseline identified
trough-to-peak
(TPBase)
yes average of PTBase +
TPBase
no PTBase
yes PTBase
no midpoint of local peak
and trough
baseline of local feature
separation between peak-to-trough and
trough-to-peak baselines
maximum value of local feature
X-Stream Operator's Manual
Baseline Separation
previous local feature's baseline
separation
Local Baseline Baseline Separation
PTBase - TPBase
Definition
0
0
0
0
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