Acquisition
l
Touch the
Dx button
for each active line, and select whether it must be High or Low
compared to the logic threshold. Depending on your selection, a logical 1 (High) or 0
(Low) now appears on the dialog. Leave X selected for any line you wish to exclude from
the pattern. Use the Left and Right Arrow buttons to display lines in other digital banks.
Note:
As an alternative to a pattern, you may set edge conditions on any line. Touch the
Dx button
and choose the edge. Edge conditions always assume a logical OR in the
overall trigger criteria.
As you work, the checkboxes along the bottom of the dialog will change to show the pattern.
You can also use these checkboxes to make selections.
6. If you have not already set a logic threshold, open the
Levels dialog
and select a
Logic Family
for each digital bank from which you've selected lines. To set a custom logic threshold, choose
Logic Family User Defined, then enter the
Threshold
voltage and
Hysteresis
.
Note:
Digital lines inherit the Logic Setup made when defining digital groups. However,
you can change the logic threshold on the Levels dialog. The two settings are linked
and always reflect whatever was last selected. Logic thresholds can only be set per
lead bank, not individual line.
Analog Pattern
Tip:
With the Mixed-Signal option, you can also use the Digital Pattern dialog to set an analog
state pattern. Touch Set All To... and select Don't Care. This will eliminate any meaningful
digital pattern and activate all the Boolean operators. Use the Left Arrow button to display the
C1-EXT group of inputs, and follow the procedure below to set the low/high pattern on each
input.
1. Select the Boolean
Operator
(AND, NAND, OR, or NOR) that describes the relationship among
analog inputs (e.g., C1 must be High NAND C2 must be Low).
2. For each input to be included in the trigger pattern, select what
State
it must be in (High, Low,
or Don't Care) compared to the threshold Level you will set. Leave "Don't Care" selected for any
input you wish to exclude.
3. For each input included in the trigger, enter the voltage threshold
Level
.
4. If you've included EXTERNAL as an input, open the
Ext tab
and enter the
Attenuation
.
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Содержание HDO9000
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