User manual

Reference
Trigger Contr
ols
You c an 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
page 97, Video Trigger.)
Pulse
Triggers on aberrant pulses. (See page 97, Pulse Width Trigger.)
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 tr
igger
Source CH1, CH2,
CH3
1
,CH4
1
,
Ext, Ext/5, AC Line
Select th
e input source as the trigger
signal (See page 96.)
Slope
Rising,
Falling
Select to trigger on either the rising
or falling edge of the signal
Mode Auto, Normal
Select the type of triggering (See
page 95.)
Coupl
ing
AC, DC
,NoiseReject,HF
Reject, LF Reject
Selec
ts the components of the trigger
signal applied to the trigger circuitry
(See page 96.)
1
Available only on a 4-channel oscilloscope.
Key Po ints
Mode Options. The Auto m ode (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.
TBS1000 Series Oscilloscopes User Manual 95