Rigol DS1000Z Series User Manual

Chapter 5 To Trigger the Oscilloscope RIGOL
DS1000Z User’s Guide
5-3
Trigger Mode
Trigger mode affects the way in which the oscilloscope searches for the trigger. The
following is the schematic diagram of the acquisition memory. As shown in the figure
below, the position of the trigger event is determined by the reference time point and
the delay setting. Note that the acquisition memory of the oscilloscope is a cyclic
buffer and the new data would overwrite the old data until the acquisition finishes.
Pre-trigger/Delayed trigger:
Acquire data before/after the trigger event. The trigger position is usually at the
horizontal center of the screen. In full-screen display, six-grid pre-trigger and delayed
trigger information are displayed respectively. You can adjust the horizontal position
of the waveform through HORIZONTAL
POSITION to view more pre-trigger
information and delayed trigger information, through which the signal information
before/after the trigger (such as capture the glitch generated by the circuit and
analyze the pre-trigger data to find out the reasons for glitch) can be obtained.
Press MODE in the trigger control area (TRIGGER) at the front panel or press
MENU  Sweep to select the desired trigger mode. The corresponding status light
of the mode currently selected turns on.
Auto:
No matter whether the trigger condition is met, there is always waveform display. A
horizontal line is displayed when no signal is input.
In this mode, the oscilloscope operates by first filling the pre-trigger buffer. It starts
searching for a trigger after the pre-trigger buffer is filled and continues to flow data
through this buffer while it searches for the trigger. While searching for the trigger,
the oscilloscope overflows the pre-trigger buffer and the first data put into the buffer
Pre-trigger Buffer Post-trigger Buffer
Trigger Event
Acquisition memory

Rigol DS1000Z Series Specifications

General

Brand	Rigol
Model	DS1000Z Series
Category	Test Equipment
Language	English