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Upper and Lower Threshold Values
The upper and lower threshold levels define the voltage limits of a runt pulse. To adjust the upper
threshold level, click the Upper Limit control and then use the multipurpose knob to set the
voltage level. To adjust the lower threshold level, click the Lower Level control and then use the
other multipurpose knob to set the voltage level.
Video Trigger Autoset
Autoset automatically sets the video trigger controls for the selected format, and optimizes the
vertical sensitivity and time per division for viewing video lines and fields. Click Lines or Fields
to optimize the settings. These controls do not appear if you select the Custom format.
Video Trigger Format
Select Custom if you have a nonstandard format, or select one of the predefined video signal
formats from the drop-down list: NTSC, PAL, SECAM, 1080i/60, 1080p/24, 720p/60, 480p/60,
1080i/50, 1080p/25, or 1080/24sF.
Video Trigger Holdoff
Specify Holdoff By Time or By Fields, and use the multipurpose knob to change the value. If
setting a Custom format, only the By Time control is available.
Video Trigger Polarity
Select Normal or Inverted polarity. Normal generally triggers on negative polarity, since the sync
pulse leading edge is negative for most standard formats. Use Inverted when probing circuitry that
inverts the video signal.
Waveform Count
Displays the number of waveforms that have contributed to the histogram.
Waveform Handle
Waveform Label
Window Trigger Levels
The upper and lower threshold levels define the voltage limits of the window. To adjust the upper
threshold level, click the Upper Limit control, and then use the multipurpose knob to set the
voltage level. To adjust the lower threshold level, click the Lower Level, control and then use the
other multipurpose knob to set the voltage level.
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