To Analyze Video Waveforms With Option 005 - HP 54616B User And Service Manual

Using Option 005 Enhanced TV/Video Trigger

To analyze video waveforms with Option 005

To analyze video waveforms with Option 005
The combination of the TV trigger, delayed sweep, and automatic
measurements allow this oscilloscope to precisely analyze video waveforms.
There is no need for external clamping to obtain a stable trigger when you
are viewing unclamped video signals. This is because the TV sync separator
in the oscilloscope has an internal clamp circuit in the trigger path. Because
there is no clamp in the vertical path of your oscilloscope, you will be able to
observe any DC level shifts in the video on the oscilloscope display. To
eliminate this position shifting as the DC component of the video changes,
select AC coupling.
For this exercise, we connect the oscilloscope to the video output terminals
on a television. We set up the oscilloscope to view the second vertical
interval with delayed sweep windowed on the vertical interval test signals
(VITS). Then we make windowed measurements with the delayed sweep.
Connect a TV signal to channel 1, and select channel 1 as your trigger
1
source.
Press
2
Slope/Coupling
panel, then press the
Select the desired TV
3
Use NTSC instead of PAL-M
To trigger on a PAL-M signal, use NTSC. The line and field rates are identical.
Press , then press the
4
Mode
3–16
in the section of the front
TRIGGER
softkey.
TV
, such as
Standard NTSC
Video Autoscale
, , or .
PAL SECAM
softkey.