Tektronix MTM400 Manual do Utilizador descarregar pdf (Página 101)

Stream View

MTM400 MPEG Transport Stream Monitor User Manual 3-53

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:

 Tests screen Î PCR Tests section Î PCR Frequency Offset (PCR_FO)

parameter (right-click) Î Max PCR overall jitter.

For individual PIDs:

 PIDs screen Î Test: select PCR Offset Î individual PID parameter (right-

click) Î Max PCR frequency offset.

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

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Tektronix MTM400 Manual do Utilizador Página 101