Main Feature Description
to meaningful waveforms.
Here introduce some basic concepts about trigger.
Trigger Source:
The trigger can be generated with multiple sources. The most common one is
the input channel (alternative between CH1 and CH2). Whether the input signal is displayed or
not, it can trigger normal operations. Also the trigger source can be any signal connected to an
external trigger channel or the AC power line (only for Edge triggers). The source with the AC
power line shows the frequency relationship between the signal and the AC commercial power.
Trigger Type:
The oscilloscope has six types of triggers: Edge, Video, Pulse Width, Slope,
Overtime and Swap.
Edge Trigger
uses the analog or digital test circuits for triggering. It happens when the
input trigger source crosses a specified level in a specified direction.
Video Trigger
performs a field or line trigger through standard video signals.
Pulse Width Trigger
can trigger normal or abnormal pulses that meet trigger conditions.
Slope Trigger
uses the rise and fall times on the edge of signal for triggering.
Overtime Trigger
happens after the edge of signal reaches the set time.
Swap Trigger
, as a feature of analog oscilloscopes, gives stable displays of signals at
two different frequencies. Mainly it uses a specific frequency to switch between two
analog channels CH1 and CH2 so that the channels will generate swap trigger signals
through the trigger circuitry.
Trigger Mode:
You can select the Auto or Normal mode to define how the oscilloscope acquires
data when it does not detect a trigger condition.
Auto Mode
performs the acquisition freely in
absence of valid trigger. It allows the generation of untriggered waveforms with the time base set
to 80ms/div or slower.
Normal Mode
updates the displayed waveforms only when the
oscilloscope detects a valid trigger condition. Before this update, the oscilloscope still displays the
old waveforms. This mode shall be used when you want to only view the effectively triggered
waveforms. In this mode, the oscilloscope displays waveforms only after the first trigger. To
perform a
single sequence acquisition
, push the SINGLE SEQ button.
Trigger Coupling:
Trigger Coupling determines which part of the signal will be delivered to the
trigger circuit. This can help to obtain a stable display of the waveform. To use trigger coupling,
push the TRIG MENU button, select an Edge or Pulse trigger, and then select a Coupling option.
Trigger Position:
The horizontal position control establishes the time between the trigger
position and the screen center.
Slope and Level:
The Slope and Level controls help to define the trigger. The Slope option
determines whether the trigger point is on the rising or falling edge of a signal. To perform the
trigger slope control, press the TRIG MENU button, select an Edge trigger, and use the Slope
button to select rising or falling. The TRIGGER LEVEL knob controls the trigger point is on which
position of the edge.
DSO5000 Series Digital Storage Oscilloscope User Manual 12
