Tektronix 11801C User Manual page 303

11801C User Manual
Table 3 13: Measurement Parameters (Cont.)
SW HW Stat Name
S/N Ratio
n
Second
n n n
Trace
Slope
n n n
Topline
n n n
Tracking
n n n
Transition
n
Number
Definition
The amplitude of a noise rejection band
centered on the mesial level. Transitions
through the mesial level are qualified by
S/N ratio by the requirement that the
signal enter the noise rejection band
and leave the band at the opposite limit
with the same slope and with no inter
mediate values outside the noise rejec
tion band. S/N ratio may be set to any
value from 1 to 99. The reciprocal of the
number is the fraction of the topline to
baseline distance that the noise rejec
tion band extends above and below the
mesial line. For a 1 V peak to peak sig
nal, S/N ratio of 20 creates a noise re
jection band 0.05 V above and 0.05 V
below the mesial level.
The Prop Delay and phase measure
ments shows the timing difference be
tween two traces. One of the traces is
always the selected trace. Second Trace
lets you select to which trace the se
lected trace is compared. For Hardware
Mode, this can be a Saved Trace De
scription.
The direction the trace must pass
through a reference level.
The 100% level on which proximal, me
sial, distal, and reference levels are
based. When tracking mode is Both or
Topline, the 11801C repeatedly deter
mines the topline for itself and you can
not adjust it. When tracking mode is Off
or Baseline, you can set topline or you
can have the 11801C set it once by
touching the Setup selector, and then
adjust the values with the knobs.
With tracking set to Both, the topline
and baseline are repeatedly determined
by the 11801C. Tracking Off allows you
to set topline and baseline. When track
ing is set to Baseline (or Topline), just
the baseline (or just the topline) is
tracked, but not the other. Tracking is
only available if level mode is not abso
lute.
The number of times the signal must
pass through a specified voltage level
before the measurement zone begins.
Measurements
3 153