Tektronix MTM400 Manuel d'utilisateur télécharger pdf (Page 99)

Stream View

MTM400 MPEG Transport Stream Monitor User Manual 3-51

Figure 3-16: Stream view - PCR graph - PCR arrival

The PCR Arrival graph provides a display of the time interval between successive

PCRs, during the last 256 PCRs. The interval is displayed on the y-axis. Points are

color-coded with respect to the Maximum Repetition Period set in DVB test 2.3

(The DVB default value is 40 ms). Points are plotted in blue when they fall within

the specified period. Any points that exceed the interval are plotted in red. If the

interval exceeds the limits displayed on the screen, the scale is adjusted

automatically as necessary to include the maximum displayed values.

The PCR Maximum Repetition Interval can be adjusted for individual PIDs as

follows:

 PIDs screen Î Test: select PCR Repetition Î individual PID parameter

(right-click) Î PCR max repetition interval.

 Right-click on the graph and set the limit for each PID.

PCR Overall Jitter (PCR_OJ)

The PCR Overall Jitter graph shows the difference between the actual value of the

PCR (expressed as a time) and its expected value based on its measured arrival

time.

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Tektronix MTM400 Manuel d'utilisateur Page 99