Tektronix WFM2200A, Руководство пользователя

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Figure 27: The Jitter display parameters as shown when the instrument is in single-tile
mode
Elements of the
Jitter display
■ Jitter Waveshape: Displays the jitter wave shape (the image to the right
shows no jitter). This shape is modified by the high-pass filter (HPF) setting.
■ Jitter Thermometer: Displays jitter value and relates it to alarm limits.
■ Jitter HPF: Indicates the setting for the Jitter High Pass Filter, set in the
CONFIG menu.
High-Pass filter
The high-pass filter bandwidth setting allows you to show only jitter terms above
the selected filter frequency. When you select a filter setting, depending on the
active input signal, you select the jitter measurement type (Timing, Alignment, or
neither, as defined by the SMPTE standard).
To choose the Jitter high-pass filter, use the Measurement pop-up menu and
choose one of the following settings for the Jitter HP Filter entry:
Setting Description
Timing Sets the detector high-pass filter to 10 Hz. This is the correct value for
measuring timing jitter for both SD and HD signals.
Align Sets the detector high-pass filter to 1 kHz, as specified by SMTPE, for SD
signals; and to 100 kHz for HD signals. These are the correct values for
measuring alignment jitter.
10 Hz, 100 Hz,
1 kHz, 10 kHz,
100 kHz Sets the detector high-pass filter to the selected value.
Display modes
WFM2300 and WFM2200A Waveform Monitors User Manual 97