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Appendix B: Automatic Measurements Supported
B-4
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
Table B- 1: Mask measurements and their definition (optional on TDS7000 Series & TDS6000 Series)
Name Definition
Ext Rati o The ratio of eye top to base.
y
p
Ext Ratio = PTop
m
e
an
/PBase
m
e
an
Extinction Ratio % The ratio of eye base to top in %.
y
p
Ext Ratio % = 100*(PBase
m
e
an
/PTop
m
e
an
)
E
x
t
i
n
c
t
i
o
n
R
a
t
i
o
d
B
T
h
e
r
a
t
i
o
o
f
e
y
e
t
o
p
t
o
b
a
s
e
i
n
d
B
E
x
t
i
n
c
t
i
o
n
R
a
t
i
o
d
B
T
h
e
r
a
t
i
o
o
f
e
y
e
t
o
p
t
o
b
a
s
e
i
n
d
B
.
Ext Ratio dB = 10*Log(PTop
m
e
an
/PBase
m
e
an
)
Eye Height The eye height in watts or volts.
y
g
y
g
Eye Height = (PTop
m
e
an
-- 3*PTop
si
g
ma
) -- (PBase
m
e
an
+ 3*PBase
si
g
ma
)
Eye Width The eye width in seconds.
y
y
Eye Width = (TCross2
m
e
an
-- 3*TCross2
si
g
ma
) -- (TCross1
mean
+ 3*TCross1
si
g
ma
)
Crossing % The eye crossing point as a percentage of eye height.
Crossing % = 100*[(PCross1
mean
-- PBase
mean
)/(PTop
mean
-- PBase
mean
)]
Eye Top The top of the eye.
Eye Base The base of the eye.
Jitter Pk- Pk The peak-to-peak value for the edge jitter in the current horizontal units.
p
p
g
j
Jitter PP = TCross1
P
P
Jitter RMS The RMS value of the edge jitter in the current horizontal units.
Jitter RMS = TCross1
sigma
Jitter 6σ 6 x (Jitter RMS)
Noise Pk-Pk The peak-to-peak value of the noise of the top or base of the signal as specified by the
u
s
e
r
.
u
s
e
r
.
Noise Pk--Pk = PTop
pk--pk or
PBase
pk--pk
Noise RMS The RMS value of the noise of the top or base of the signal as specified by the user.
p
g
p
y
Noise RMS = PTop
si
g
ma
o
r
PBase
si
g
ma