116
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide
11
Triggers
To trigger on odd or even fields
To check the envelope of your video signals, or to measure worst case distortion,
trigger on the odd or even fields. When Field 1 is selected, the oscilloscope
triggers on color fields 1 or 3. When Field 2 is selected, the oscilloscope triggers
on color fields 2 or 4.
1
Press the
[Trigger]
key.
2
In the Trigger menu, press the
Trigger Type
softkey.
3
Press the
Trigger Type
softkey; then, turn the Entry knob to select
Video
.
4
Press the
Settings
softkey, then press the
Standard
softkey to select the
appropriate TV standard.
5
Press the
Mode
softkey and select
Field1
or
Field2
.
The trigger circuits look for the position of the start of Vertical Sync to determine
the field. But this definition of field does not take into consideration the phase of
the reference subcarrier. When Field 1 is selected, the trigger system will find any
field where the vertical sync starts on Line 4. In the case of NTSC video, the
Figure 18
Triggering on All Fields
