Trigger controls
You can define the trigger through the Trigger Menu and front-panel controls.
Trigger types
Three types of triggering are available: Edge, Video, and Pulse Width. A
different set of options display for each type of trigger.
Option Details
Edge (default) Triggers the oscilloscope on the rising or falling edge of the input signal
when it crosses the trigger level (threshold)
Video Displays NTSC or PAL/SECAM standard composite video waveforms;
you trigger on fields or lines of video signals. See Video trigger on
page 104.
Pulse Triggers on aberrant pulses. See Pulse width trigger on page 104.
Edge trigger
Use Edge triggering to trigger on the edge of the oscilloscope input signal at the
trigger threshold.
Options Settings Comments
Edge With Edge highlighted, the rising or falling edge
of the input signal is used for the trigger
Source Ch1, Ch2, Ext, Ext/5,
AC Line
Select the input source as the trigger signal
Slope Rising, Falling Select to trigger on either the rising or falling
edge of the signal
Mode Auto, Normal Select the type of triggering
Coupling AC, DC, Noise Reject,
HF Reject, LF Reject
Selects the components of the trigger signal
applied to the trigger circuitry. SeeCoupling on
page 22.
Key points
Mode Options. The Auto mode (default) forces the oscilloscope to trigger when
it does not detect a trigger within a certain amount of time based on the
horizontal scale setting. You can use this mode in many situations, such as to
monitor the level of a power supply output.
Use the Auto mode to let the acquisition free-run in the absence of a valid trigger.
This mode allows an untriggered, scanning waveform at 100 ms/div or slower
time base settings.
The Normal mode updates displayed waveforms only when the oscilloscope
detects a valid trigger condition. The oscilloscope displays older waveforms until
the oscilloscope replaces them with new ones.
Reference
102 TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual
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