Jitter analysis and clock data recovery
R&S
®
RTO6
1077User Manual 1801.6687.02 ─ 05
Relative polarity
Sets the edge of the second waveform relative to the first waveform.
"Matching"
Measures from positive to positive edge or from negative to negative
edge.
"Inverse"
Measures from positive to negative edge or from negative to positive
edge.
Remote command:
MEASurement<m>:JITTer:
SKWRelation on page 2484
Data ref level / Clock ref level
See "Ref level" on page 326 and "Clock ref level" on page 325.
18.1.2.5 Example: measuring TIE with HW CDR
To measure the time interval error with hardware-recovered clock, the option
R&S RTO6--K13 is required.
1. Configure the HW CDR settings according to the characteristics of the measured
signal.
2. Set up the trigger:
a) "Menu">"Trigger" > "Setup" > "Source" = channel of the input signal > Trigger
type = CDR
b) Tap "Find level" to determine the trigger level.
3. Configure the measurement:
a) On the "Measure" menu, select "Setup".
b) Select the "Jitter" category.
c) Tap "Add / Remove" and select "Time interval error".
d) Tap "Time interval error" in the "Active measurements" list.
e) Select the "Data slope" and the reference level to be used to measure the jitter.
f) Select the "Clock = Hardware CDR".
g) In the "Measure" > "Setup" tab, enable the measurement.
h) Enable "Statistics".
18.1.3 Jitter statistics and histogram
Since jitter is a random component of all signals, statistical measurement results are
required to characterize the jitter.
To get measurements statistics of a jitter measurement
Prerequisite: the jitter measurements are selected and configured, and the measure-
ment group is active.
1. Double tap the "Meas Results" box.
The "Measurement" toolbar assist opens.
Jitter measurements (options R&S RT
O6-K12/K13)
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