Tektronix 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)

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 Ratio The ratio of eye top to base.
y
p
Ext Ratio = PTopm
e
an /PBasem
e
an
Extinction Ratio % The ratio of eye base to top in %.
y
p
Ext Ratio % = 100*(PBasem
e
an /PTopm
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(PTopm
e
an /PBasem
e
an )
Eye Height The eye height in watts or volts.
y
g
y
g
Eye Height = (PTopm
e
an -- 3*PTopsi
g
ma) -- (PBasem
e
an + 3*PBasesi
g
ma)
Eye Width The eye width in seconds.
y
y
Eye Width = (TCross2m
e
an -- 3*TCross2si
g
ma) -- (TCross1mean + 3*TCross1si
g
ma)
Crossing % The eye crossing point as a percentage of eye height.
Crossing % = 100*[(PCross1mean -- PBasemean )/(PTopmean -- PBasemean )]
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 = TCross1sigma
Jitter 6σ6 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 = PToppk--pk or PBasepk--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 = PTopsi
g
ma
o
r
PBasesi
g
ma