Setting The Trigger System - Tenma 72-8710 Operating Manual

DSO Series User Ma nual

Setting the Trigger System

Triggering decides when the oscilloscope collects data and display
waveforms. Once the trigger is correctly set up, it can transform
unstable displays into meaningful waveforms. When beginning to
acquire data, the digital storage oscilloscope first collects sufficient
data required for drawing a waveform on the left side of the trigger
point. While waiting for the trigger condition to mature, your
oscilloscope will acquire data continuously. When trigger is
detected, it will continue to acquire sufficient data to draw a
waveform on the right side of the trigger point. The trigger control zone
on the operation panel of your oscilloscope comprises a trigger level
adjustment knob, a trigger menu button [TRIG MENU], the [SET TO
ZERO] button for setting the trigger level to the vertical centre point of
the signal, and a compulsory trigger button [FORCE].
Trigger level :
Trigger level is set to a signal voltage that matches the
trigger point.
[SET TO ZERO]: Trigger level is set to the vertical centre point of
the signal.
[FORCE]: To generate a trigger signal compulsorily. This button is used
mainly in the trigger mode and "normal" and "single" mode.
[TRIG MENU] : Button for the trigger setup menu.
Trigger Control
Trigger modes : edge, pulse and alternate.
Edge Trigger
When the edge of the trigger signal reaches a given level, trigger
occurs.
Pulse Width Trigger
When the pulse width of the trigger signal reaches a preset trigger
condition, trigger occurs.
Alternate Trigger
Applicable to triggering signals without frequency coherence.
Below are notes for various trigger menus.
Edge Trigger
Edge trigger means triggering at the trigger threshold of the input signal
edge. When selecting " edge trigger" , you are triggering at the
rising and falling edges of the input signal.
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