Chapter Iv Trigger System; Edge Trigger - UNI-T UTD2000 Series User Manual

Chapter IV Trigger System

When to collect data and display waveform depends on the trigger system. The DSO will
convert the unstable displays into meaningful waveform after the trigger is set correctly.
When the DSO start collecting data, it will firstly collect enough data to draw a waveform
on the left of trigger. DSO will consecutively collect data while it waits the occurrence of
trigger condition. After the trigger is detected, DSO consecutively collect enough data to
draw a waveform on the left of trigger. The trigger control area of DSO operation panel
includes:
LEVEL knob: Trigger level adjustment knob, set the corresponding voltage value of trigger
point.
SET TO ZERO: Set the trigger level to the vertical center of trigger signal range.
TRIG MENU: Trigger setting menu button.
Trigger Control
 Trigger Type: Edge, pulse, video, slope and alternating trigger.
 Edge Trigger: When the edge of trigger signal satisfies a certain set level, the
trigger starts.
 Pulse Width Trigger: When the pulse width of the trigger signal satisfies a certain
set condition, the trigger starts.
 Video Trigger: Conduct field or line trigger for standard video signal.
 Slope Trigger: When the rising/descending slope of signal meets with the set value,
the trigger starts.
 Alternating Trigger: CH1 and CH2 trigger their own signals alternatively, applicable
to trigger signals without frequency correlation.

4.1 Edge trigger

Edge trigger mode refers to triggering of trigger threshold on the input signal edge.
When selecting "edge trigger", trigger on the rising edge or falling edge of input signal shall
be completed.
Table 4-1 Edge trigger menu
Function Menu Setting
Type Edge
CH1
CH2
Source
EXT
AC Line
Rising
Slope Falling
Rise/fall
Description
Set CH1 as the triggering signal source.
Set CH2 as the triggering signal source.
Set external trigger input channel as the triggering signal source.
Set AC power line as trigger source.
Set trigger on the signal rising edge.
Set trigger on the signal falling edge.
Set trigger on the signal both rising and falling edge.
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UTD2000 Series User Manual