How To Set The Trigger System - Promax OD-610 User Manual

How to Set the Trigger System

3.4
Trigger determines when DSO starts to acquire data and display waveform. Once
trigger is set correctly, it can convert the unstable display to meaningful
waveform.
When DSO starts to acquire data, it will collect enough data to draw waveform on
left of trigger point. DSO continues to acquire data while waiting for trigger
condition to occur. Once it detects a trigger it will acquire enough data
continuously to draw the waveform on right of trigger point.
Trigger control area consists of 1 knob and 3 menu keys.
TRIG LEVEL: The knob that set the trigger level; press the knob and
the level will be cleaned to Zero.
50%: The instant execute button setting the trigger level to the
vertical midpoint between the peaks of the trigger signal.
Force: Force to create a trigger signal and the function is mainly used
in "Normal" and "Single" mode.
Trigger Menu: The button that activates the trigger control menu.
• TERM INTERPRETATION
Source
►
Trigger can occur from several sources: Input channels (CH1, CH2), Ext,
Ext/5.
Input: It is the most commonly used trigger source. The channel will
work when selected as a trigger source whatever displayed or not.
Ext Trig: The instrument can be triggered from a third source while
acquiring data from CH1 and CH2. For example, to trigger from an
external clock or with a signal from another part of the test circuit. The
EXT, EXT/5 trigger sources use the external trigger signal connected to
the EXT TRIG connector. Ext uses the signal directly; it has a trigger
level range of -0.6V to +0.6V. The EXT/5 trigger source attenuates the
signal by 5X, which extends the trigger level range to -3V to +3V. This
allows the oscilloscope to trigger on a larger signal.
Trigger Mode
►
The trigger mode determines how the oscilloscope behaves in the absence
of a trigger event. The oscilloscope provides three trigger modes: Auto,
Normal, and Single.
Auto: This sweep mode allows the oscilloscope to acquire waveforms
even when it does not detect a trigger condition. If no trigger condition
occurs while the oscilloscope is waiting for a specific period (as
determined by the time-base setting), it will force itself to trigger.
36
Page June 2017