Edge Trigger - UNI-T UTD2000CEX-II Series User Manual

Note: This mode allows 50ms/div or slower time shift without triggering in ROLL
mode.
■ Normal trigger: The oscilloscope can only collect data when the trigger condition
is satisfied. When it is not triggered, the oscilloscope will wait for the triggered
signal.
■ Single triggle : When the user presses the "run" button, the oscilloscope will
wait for the trigger. When the instrument detects a trigger, the waveform is
sampled and displayed, and enters the STOP state. Press the SINGLE button
on the front panel of the oscilloscope to quickly enter the single trigger mode.
(3) Trigger Coupling
Trigger coupling determines which part of the signal will be transmitted to the
trigger circuit. The coupled type includes DC, AC, low frequency, high frequency
suppression, and noise suppression.
■ DC：Pass all components of the signal
■ AC: Blocks the DC component and attenuates any signal components below
10Hz.
■ High frequency suppression: Attenuates high frequency components over
1MHz.
■ Low frequency suppression: Blocks the DC component and attenuates low
frequency components below 680 kHz.
■ Noise suppression: Suppress high frequency noise in the signal, and reduces
probability of error.
(4) Trigger Sensitivity
The minimum signal required to generate a correct trigger. For example, normally
the input channel (CH1~CH2) trigger sensitivity is 1div, which means the signal
should be at least 1 div.
(5) Pre-Trigger / Delayed Trigger
Data collected before / after the Trigger event.
Trigger position is usually set at the level center of the screen, and you can
observe 7 grids of pre-trigger and delay trigger information. The horizontal
displacement of the wave can be adjusted by the horizontal displacement
position knob in order to observe more pre-trigger information.
(6) Forced Trigger
Press the FORCE key to generate a forced trigger signal.
If the waveform is not displayed in normal mode or single shot mode, press
the FORCE button to collect signal baseline to ensure the acquisition is normal.

3.2 Edge Trigger

The signal can be triggered by the rising or falling edge.
Press the TRIG MENU to enter the trigger menu. Press F1 to select the trigger
type, and select the edge trigger mode with the multipurpose knob.
The edge trigger menu descriptions :
Options Descriptions
Functions
Type Edge
Set any one of the CH1,CH2 as a trigger signal
CH1, CH2
Set external trigger as the source
EXT
Set AC line as trigger
AC Line
Sources
Alternate trigger Set CH1, CH2 as alternate trigger source
Set the falling edge as the trigger signal
fall
Set the rising and falling edge as the trigger signal
Rise/fall
Pass all components of the signal
DC
Blocks the DC components of the signal
AC
UTD2000CEX-II
User Manual