UPO2000CS series User Manual
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Chapter 3 Trigger System
Trigger determines when the oscilloscope starts to collect data and display waveform. Once the trigger is
correctly set, it can convert unstable signals into meaningful waveforms. In the beginning of data acquisition, it
collects enough data to compose the waveform starting at the left of the trigger point, and continues until the
trigger condition is met.
In this chapter UPO2XX4CS will be used as the example.
3.1Trigger System Interpretation
(1)Trigger Source
A signal for generating a trigger. Triggers can be obtained from a variety of sources such as input channels
(CH1, CH2, CH3, CH4), external trigger (EXT, EXT/5), Line AC, etc.
•
Input channel
: Select any one of the analog signal input terminal CH1~CH4 on the front panel of the
oscilloscope as a trigger signal.
•
External trigger
: Select the input Trig EXT from the back of the oscilloscope. For example, the external
clock input can be used on the Trig EXT terminal as a trigger source. EXT signal trigger level ranges from
–1.8V~ +1.8V can be set. The EXT/5 trigger signal divides the actual signal by 5, so the trigger level can be
increased to -9V ~ +9V.
•
AC Line
：
Power supply signal, used to observe the relationship between power signals such as lighting
equipment and power supply equipment, to obtain stability in synchronization.
(2)Trigger Mode
Trigger mode determines the behavior of the wave during a trigger event. This oscilloscope provides three
kinds of trigger modes: auto, normal, and single shot.
•
Auto trigger
: When there is no trigger signal, the system automatically runs and displays data. When the
trigger signal is generated, it automatically switch to trigger scanning and signal synchronization.
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 shot
: 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
Summary of Contents for UPO2000CS Series
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Page 64: ...UPO2000CS series User Manua 63 X Y Phase Difference Table ...
Page 69: ...UPO2000CS series User Manual 68 User Defined Parameter Statistics ...
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