Stream View

PCR Frequency Offset (PCR_FO)

The Frequency Offset graph shows the difference between the program clock frequency and the nominal clock frequency (measured against a reference that is not PCR or transport stream derived).

Figure 3-18: Stream view - PCR graph - PCR frequency offset

PCR Frequency Offset is a measurement of the error in the PCR frequency from the specified 27 MHz; the MPEG specification sets the limits at ±810 Hz.

The Maximum PCR Frequency Offset can be adjusted for all PIDs as follows:

ƒTests screen Î PCR Tests section Î PCR Frequency Offset (PCR_FO) parameter (right-click)Î Max PCR overall jitter.

For individual PIDs:

ƒPIDs screen Î Test: select PCR Offset Î individual PID parameter (right- click) Î Max PCR frequency offset.

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

MTM400 MPEG Transport Stream Monitor User Manual

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