Chapter 6 Trigger System
103
Trigger hold-offoperation prompt
It is typically used for complex waveforms. The correct hold-offsetting is usually slightly smaller than one repetition
of the waveform. Setting the hold-offtime to this time can become the only trigger point for the repetitive waveform.
Changing the time base setting will not affect the trigger hold-offtime.
Using Zoom function, you can tap “Run/Stop” to stop, then horizontally move and zoom the data to find the position
where the waveform is repeated. Use the cursor to measure this time and then set the hold-offtime.
⚫
Use “SingleSEQ” button for single acquisition
Usually when performing a single acquisition, you must initiate some operations on the measured equipment, and
the oscilloscope is not desired to trigger automatically before these operations. The trigger condition indicator
is displayed in the upper left corner of the screen before starting operations in the circuit (this means the pre-trigger
buffer is filled).
6.2 Edge Trigger
When the edge of trigger signal reaches a certain trigger level, the set signal is triggered and generated. Trigger
occurs on either edge of the rising edge (indicating icon
at the top of the screen), falling edge (
) or dual edge
(
), and the trigger level can be set to change the vertical position of the trigger point on the trigger edge, namely
the intersection point of the trigger level line and the signal edge. The stable waveform can be obtained by correctly
setting the edge trigger coupling mode. Edge trigger menu is shown in the table below:
Trigger
Option
Setting
Description
Trigger
Source
CH1
Set CH1 as trigger signal source
CH2
Set CH2 as trigger signal source
CH3
Set CH3 as trigger signal source
CH4
Set CH4 as trigger signal source
Slope
Rising edge
Set signal trigger on the rising edge
Falling edge
Set signal trigger on the falling edge
Dual edge
Set signal trigger on either rising edge or falling edge
Coupling
DC
AC and DC components getting through trigger signals
AC
Filter out the DC component of trigger signals
HF rejection
Suppress signals above 50KHz in trigger signals
LF rejection
Suppresses signals below 50KHz in trigger signals
Noise rejection
Low-sensitivity DC coupling to suppress high-frequency noise in trigger signals
Summary of Contents for ATO1000 Series
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