Agilent Technologies 2000 X, User Manual

Page: 131 / 296

Triggers
9
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 131
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
softkey; then, turn the Entry knob
to select Video .
3 Press the Settings softkey, then press the Standard softkey to select the
appropriate TV standard.
4
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
Figure 18 Triggering on All Fields