Pcr Time Domain Monitoring - Planar IT-100 Operating Manual

4.6.8. PCR time domain monitoring

Time domain monitoring of program PCR timestamps allows to measure PCR
repetition period, PCR frequency offset etc., in real time with representing measuring
results in a form of a graph (figure 4.58).
Each of the graphs consists of three traces. Depending on the measured parameter,
the traces have the following meaning:
parameter
PCR accuracy (PCR source jitter)
PCR repetition period
PCR drift rate
PCR frequency offset
Each trace includes 300 time intervals. Depending on the user-defined measurement
duration, each time interval equals to:
Measurement
5 min
duration
Time interval,
1
sec
Each time interval accumulates parameter value according to trace type.
There is program name, its identifier (SID) and PCR PID identifier (PID) at the top of
the screen. The following information is indicated on the right of the screen: measured
parameter name, starting time and date of the interval and the measurement results in the
cursor position. Measurement results value color corresponds to the trace color. In case of
transport stream synchronization loss, corresponding time intervals is not shown on the
trace.
Monitoring setting up is performed in the «F1 / Settings» context menu:
1) Duration. Monitoring duration: 5 min, 10 min, 30 min, 1 h, 2 h, 6 h, 12 h, 24 h,
48 h, 72 h.
Selecting of the parameter to show on the graph is performed in «F2 / View» context
menu:
1) PCR accuracy. PCR timestamps source jitter;
2) PCR interval. PCR repetition period;
3) PCR drift rate;
4) PCR freq. offset. PCR frequency offset.
Picture 4.58
10 min 30 min
2 6
77
trace value
trace 1
maximum
maximum average
maximum
maximum average
1 h 2 h 6 h
12 24 72
trace 2 trace 3
RMS minimum
minimum
RMS minimum
minimum
12 h 24 h 48 h
144 288 576
72 h
864