Setting The Trigger System; Triggering Control - Extech Instruments MS420 User Manual

S T
ETTING THE RIGGER
The trigger determines when the acquisition and display of waveform data occurs.
When starting to acquire data, the oscilloscope collects sufficient information to draw
the waveform at the left side of the triggering point. While waiting for a triggering
condition, the oscilloscope gathers data continuously. After a trigger is detected, the
oscilloscope gathers data continuously to draw the waveform at the right side of the
triggering point.
To set a trigger mode, perform the following steps:
Press the MENU key; the function menu will appear at the right of the screen.
1.
2. Press MENU ▲ or MENU ▼ to select TRIG MODE. Five (5) selectable options will
then be available at the bottom of the screen.
3. Use the soft-keys (F1 to F5) to select and configure the desired options.
4. Press OPTION; the following will appear on the display during edge triggering and
video triggering modes:
— Time
— Trig
During alternate triggering the following will be displayed:
—Time Base
—Trig1
(yellow)
5. Press ▲
(yellow)
or ►
horizontal position.
T C
RIGGERING ONTROL
There are three triggering modes: Edge triggering, Video triggering, and Alternating
triggering. Each trigger mode has its own function menu.
Edge triggering: The edge trigger triggers on the incoming signal edge. Use the
edge trigger for all signals except for video.
Video triggering: Perform video field trigger or line trigger on standard video signals.
Alternate trigger: Use this mode when the CH1 and CH2 signal frequency differs.
The following describes the Edge triggering, Video triggering and Alternating
triggering menus respectively.
S
YSTEM
— Time Base
— Trig
— Time
— Trig2
(yellow)
or ▼ to adjust the vertical trigger position, Press ◄
(yellow)
to adjust the time base horizontal position or adjust the
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