Specifications

General Operation
VTM Series Installation and Operation Handbook
3-26
Table 3-14. Eye HD-SDI Pane Menu Structure
10 Hz
100 Hz
JITTER HPF
1000 Hz
OVERLAY
TRIGGER MODE
20 EYE
EYE PATTERN SETUP
Press ENT
Jitter High Pass Filter (HPF) Selection
Because jitter on the data can develop from many sources and have a unique frequency
distribution, the bandwidth of the sampling clock recovery circuit will affect the
displayed jitter if the frequency of the jitter is within the bandwidth of the clock
recovery circuits. Above the loop bandwidth, the loop has no effect on the jitter.
While within the bandwidth, the apparent jitter displayed will be satisfied by the loop
response.
To access the jitter high pass filter selections, press the EYE button until Eye Pattern
pane menu appears. Select between 10 Hz, 100 Hz, or 1 kHz is high tally. When
10 Hz, 100 Hz, or 1 kHz is selected, the –3 dB response points only allow jitter above
the selected filter frequency. This is useful with estimating the effects of jitter on clock
recovery circuits of similar bandwidths in receivers and inferring the sources of the
observed jitter based on frequency components present.
Trigger Mode
The TRIGGER MODE submenu is located in the EYE PATTERN SETUP menu.
Within the TRIGGER MODE submenu, two modes of operation are available:
• OVERLAY
• 10/20 EYE (10 Eye and Overlay for SD/20 Eye and Overlay for HD)
Distortions in Overlay mode are all displayed in the visible eye locations of the Eye
Pattern display, giving a more easily observed display of the total jitter. Overlay
displays three eye openings.
Eye Pattern Setup
Press the ENT button to access the global Eye Pattern setup menu. For more
information on the global Eye Pattern Setup menu see Section 4.