Tektronix MTX100A, User Manual

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Adding Jitter to PCRs
3-54
MTX100A MPEG Recorder & Player User Manual
3. The PCR Inaccuracy dialog box lets you set the parameters for how jitter will
be added to the PCR.
„
Pattern: Selects the type of waveform used to add jitter. You can select
Sine, Square, Triangle, Pulse, Sawtooth, Random, or Offset.
Press the TAB button repeatedly to select the list box, and then press the
arrow buttons to select the desired waveform.
„
Period: Sets the period of the waveform used to add jitter. You can set the
value from 5 to 3000 packets in 1 packet steps.
Press the TAB button repeatedly to select the text box, and then press the
SELECT button to open the keypad. Use the keypad to enter the desired
value.
„
Amplitude: Sets the amplitude of the waveform used to add jitter. You can
set the value from 0/27 MHz to 135000000/27 MHz (0 to 5 s).
Press the TAB button repeatedly to select the text box, and then press the
SELECT button to open the keypad. Use the keypad to enter the desired
value.
„
Pulse Width: Sets the pulse width of the waveform used to add jitter. You
can set the value from 1 to (period-1) packet(s) in 1 packet steps. This
Pulse Width parameter is available only when the Pattern parameter is set
to Pulse.
Press the TAB button repeatedly to select the text box, and then press the
SELECT button to open the keypad. Use the keypad to enter the desired
value.
4. After you have set the parameters, press the ENTER button to enable the jitter
function.
Figure 3-18 shows the relationship among the parameters and how the PCR values
(program_clock_reference_base value and program_clock_reference_extension)
change when Sine is selected as a jitter-pattern waveform. The PCR values varies
by the value of sine waveform defined by the amplitude and period. The PCR
period does not change.