Appendix B: Automatic Measurements Supported

CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual B-5

Table B- 1: Mask measurements and their definition (optional on TDS7000 Series & TDS6000 Series) (Cont.)

Name Definition
S/N Ratio Ratio of the signal amplitude to the noise of the top or base of the signal as specified
b
y
t
h
e
u
s
e
r
.
b
y
t
h
e
u
s
e
r
.
S/N Ratio = (PTop -- PBase)/(PTopsigma or PBasesigma )
DutyCycleDistortion The peak-to-peak time variation of the first eye crossing measured at the MidRef as a
p
e
r
c
e
n
t
o
f
t
h
e
e
y
e
p
e
r
i
o
d
.
p
e
r
c
e
n
t
o
f
t
h
e
e
y
e
p
e
r
i
o
d
.
DCD (%) = 100% x TDCDp--p/(TCross2mean -- TCross1mean )
Quality Factor Ratio of eye size to noise.
y
y
Quality Factor = (PTopm
e
an -- PBasem
e
an )/(PTopsi
g
ma + PBasesi
g
ma)

Levels Used in Taking Amplitude, Timing, and Area Measurements

Refer to Figure B--1 and the descriptions that follow to interpret the definitions

of waveforms in categories Amplitude, Timing, and Area. Low reference, mid

reference, and high reference are the default reference levels and are adjustable.

High (Histogram)
Low (Histogram)
Low (Min/Max)
High (Min/Max)
Mid reference
High reference 90%
10%
50%
Low reference

Figure B- 1: Levels used to determine measurements