128 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
9 Triggers
 
To trigger on all sync pulses
To quickly find maximum video levels, you could trigger on all sync 
pulses. When All Lines is selected as the Video trigger mode, the 
oscilloscope will trigger on all horizontal sync pulses.
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 All Lines.
Figure 15 Example: Triggering on Line 136