Logic Triggering
In Detail
3Ć58
The Trigger readout (at the bottom of the display) shows some of the key
parameters of the logic trigger (see Figure 3-26).
Trigger Class = State
Ch 1, 2, 3 Inputs = High, Don’t Care, Don’t Care
Ch 4 Input =
Rising Edge
Logic = OR
Figure 3-26: Logic Trigger Readouts
NOTE
When Logic is the selected trigger type, the threshold levels that
help determine triggering are set for each channel individually in the
Set Thresholds menu. Therefore, the Trigger Level readout will
disappear on the display and the Trigger Level knob can be used
to set the threshold level while the Main Trigger menu is set to
Logic.
Table 3-3 lists the definitions for the four types of logic triggers. Keep the two
classes of logic triggers (pattern and state) in mind, as you apply the defini-
tions.
Pattern
—At the end of trigger holdoff, the oscilloscope samples the inputs
from all the channels. The oscilloscope then triggers if the conditions defined
in Table 3-3 are met. (Goes TRUE or Goes FALSE must be set in the Trig-
ger When menu. The other settings in that menu are described in
Define a
Time Qualified Pattern Trigger on page 3-62.)
State
—At the end of trigger holdoff, the oscilloscope waits until the edge of
channel 4 on the TDS 640 (or Aux 2 on the TDS 620) transitions in the speci-
fied direction. At that point, the oscilloscope samples the inputs from the other
channels and triggers if the conditions defined in Table 3-3 are met.
Logic Trigger
Readouts
Definitions
Содержание TDS 620
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