Settings panel (Timeout Trigger configuration menu) fields and controls
Field or control
Description
Source
Lists the source channel or waveform to use to trigger.
Trigger When
• Stays High: The signal stays above the specified threshold level longer than the specified time.
• Stays Low: The signal stays below the specified threshold level longer than the specified time.
• Either: The signal stays above or below the specified threshold level longer than the specified
time.
Threshold
Sets the amplitude level that the signal must pass through to be considered a valid transition.
Set to 50%
Sets the threshold at 50% of the measured signal transition range. 50% is calculated as (Top +
Bottom)/2.
Time Limit
Sets the time period condition to be met.
Mode & Holdoff
Trigger Mode determines how the instrument behaves in the absence or presence of a trigger event.
Holdoff sets the amount of time the oscilloscope waits after a trigger event before detecting and
triggering on the next trigger event.
For additional information on Trigger Mode, Holdoff, forcing a trigger, and the Trigger Frequency
Counter see
on page 226.
Act On Trigger
Set the actions the instrument takes when a trigger event occurs.
For additional information on the Act On Trigger panel see
on page 227.
Trigger types
Use the following links to see more information on specific trigger types.
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Video trigger configuration menu
Use the Video Trigger menu to trigger the oscilloscope on video signals.
Trigger on specified fields or lines of a composite video signal. Only composite signal formats are supported. Trigger on NTSC, PAL, or
SECAM signals. Triggering also works with Macrovision signals.
Trigger on a variety of HDTV video standard signals, as well as custom (non-standard) bilevel and trilevel video signals with 3 to 4,000
lines.
To open the Video trigger menu:
Menus and dialog boxes
3 Series Mixed Domain Oscilloscope Printable Help
225