Monitoring the SDI Physical Layer
Figure 55: Measuring jitter
To Manually Measure Jitter
NOTE. If you us e the measurement cur
sors to measure jitter, you may get a
different result than that shown in the jitter thermometer for the following reasons:
the internal peak detector does a better job of measuring jitter excursions than
manually positioning the cursor; or the noise floor is removed from the jitter
measurement readout but not from the cursor delta readout.
1. Perform the initial setup for Eye measurements. (See page 105, Eye
Measurement Set Up.)
2. Use the SWEEP button to select the 3 EYE mode, which shows peak jitter
at each eye crossing.
3. Use the Eye pop-up menu to set the jitter high-pass filter to one of the
following:
To measure timing jitter, select the 10 Hz filter for both SD and HD
signals, or select the Timing filter.
To measure alignment jitter, select the 1 kHz fi lter for SD signals or select
the 100 kHz fi lter for HD signal s, or select the Align filter.
110 WFM8200 and WFM8300 Waveform Monitors
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