General Operation
46 TVM Series Installation and Operation Handbook
Copyright © 2008, Harris Corporation
Eye Pattern Rise Time
Rise times of the waveform can be calculated by measuring the 20% to 80% rise time
points with the time cursors.
Jitter Meter and Eye Pattern Correlation
The jitter meter located just above the Eye pattern display is intended to display the
maximum value of jitter over time. The correlation of values derived by using
measurement cursors versus the jitter meter could differ unless the eye pattern is
displayed using the maximum persistence setting. A normal persistence setting will
make it more difficult to view pixels near the widest sample points, which forces the
placement of the measurement cursors to a lower (narrower) jitter value. Jitter can only
be selected when the Eye Pattern is enabled.
Horizontal Magnification and Zoom in Eye Pattern Mode
Gain is used to set the range of amplification in the video signal. The standard gain in
the video signal is x1. The TVM can be used to set the gain amplification in the video
signal using the Gain group of buttons. The gain setting appears in the upper-left
portion of the waveform pane, as shown in Figure 3-12.
Press the MAG button to step through the available Horizontal Magnifications
of x1, x5, and x10: 1 ns, 0.20 ns, and 0.10 ns for SD or 250 ps, 50 ps, and 25
ps for HD. The type of magnification along with the format displayed
determines how many “Eyes” are displayed. Table 3-12 describes the Horizontal
Magnification Conditions.
Table 3-12. Horizontal Magnification Conditions
Horizontal Mag
Format
Displayed
Number of Eyes Displayed
SD/HD 3 eye displayed
SD 10 eyes displayed
x1 (1 ns or 250 ps)
HD 20 eyes displayed
SD/HD 3/5 eye displayed
SD 2 eyes displayed
x5 (0.20 ns or 50 ps)
HD 4 eyes displayed
SD/HD 3/10 eye displayed
SD 1 eye displayed
x10 (0.10 ns or 25 ps)
HD 2 eyes displayed
Press the ZOOM button to zoom around the reference graticule. At each zoom
position, the graticule scale and eye pattern displays expand to provide more
resolution around the zoom point.
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