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Time
20ns to 10.0sec
Overtime Trigger: In Pulse Width trigger, you may sometimes be puzzled with the long time for
trigger, as you do not need a complete pulse width to trigger the oscilloscope, but want the trigger
occurs just upon the overtime point. This is called Overtime Trigger.
Options
Settings
Type
Source
Positive
Polarity
Negative
Mode
Normal
Overtime
Coupling
HF Reject
LF Reject
Holdoff: To use Trigger Holdoff, push the HORIZONTAL Menu button and set the Holdoff Time
option by pressing F4. The Trigger Holdoff function can be used to generate a stable display of
complex waveforms (such as pulse trains). Holdoff is the time between when the oscilloscope
detects one trigger and when it is ready to detect another. During the holdoff time, the oscilloscope
will not trigger. For a pulse train, the holdoff time can be adjusted to let the oscilloscope trigger only
on the first pulse in the train.
Trigger Level
Indicates
Trigger Points
5.5 Menu and Option Buttons
As shown below, these six buttons at the top of the front panel are used mainly to recall relative
DS2002A Series Digital Storage Oscilloscope User Manual
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Press F4 to select this option. Turn the multi-functional knob
to set the time span.
OT
CH1
Select the trigger source.
CH2
Select to trigger on positive or negative pulses.
Auto
Press F5 to select Overtime option and adjust V0 to set the
t
time.
AC
DC
Selects the components of the trigger signal applied to the
trigger circuitry.
Holdoff
Comments
Holdoff
Basic Operation
32
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