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The trigger level is set to the vertical midpoint between the peaks of the trigger signal.
3.
Force Trigger
Used to complete an acquisition regardless of an adequate trigger signal. This button becomes useless if the
acquisition is already stopped.
4.
TRIG MENU
Push this button to display trigger menus. The edge trigger is in common use. See the table below for details.
Options
Settings
Comments
Trigger Type
Edge Video
Pulse Slope
Swap Overtime
By default, the oscilloscope uses the edge trigger which triggers the oscilloscope on the rising or
falling edge of the input signal when it crosses the trigger level (threshold).
Source
CH1
CH2
EXT
EXT/5
AC Line
Select the input source as the trigger signal.
CH1, CH2: No matter the waveform is displayed or not, a certain channel will be triggered.
EXT: Does not display the trigger signal and allows a trigger level range of +1.6V to -1.6V.
EXT/5: Same as EXT option, but attenuates the signal by a factor of 5 and allows a trigger level
range of +8V to -8V.
AC Line: Uses a signal derived from the power cord as the trigger source.
Mode
Auto
Normal
Select a trigger mode.
By default, the oscilloscope uses the Auto mode. In this mode, the oscilloscope is forced to trigger
when it does not detect a trigger within a certain amount of time based on the SEC/DIV setting. The
oscilloscope goes into the scan mode at 80ms/div or slower time base settings.
In the Normal mode, the oscilloscope updates the display only when it detects a valid trigger
condition. New waveforms are not displayed until they replace old ones. Use this mode to just view
valid triggered waveforms. Only after the first trigger does the display appear.
Coupling
AC
DC
HF Reject
LF Reject
Select the components of the trigger signal applied to the trigger circuitry.
AC: Blocks DC components and attenuates signals below 10Hz.
DC: Passes all components of the signal.
HF Reject: Attenuates the high-frequency components above 80kHz.
LF Reject: Blocks DC components and attenuates the low-frequency components below 8kHz.
NOTE:
Trigger coupling only affects the signal passed through the trigger system. It does not affect the bandwidth or
coupling of the signal displayed on the screen.
5.
Video Trigger
