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The Trigger Menu
Channel/Pattern Field
Channel/Pattern Field
The Channel/Pattern field is located next to the Mode field. It allows you to
enter a pattern for the combination of the input channels and the ECL
external trigger.
Channel
The Channel row lists the inputs available on the oscilloscope module being
used. Channels are numbered 1, 2, and Ex. Ex is for the ECL external
trigger.
Pattern
Each entry in the pattern shown in the Pattern row shows the trigger
condition of the input above it in the Channel row.
You must set the trigger level for each input you want to use in the pattern.
You set the trigger levels using the knob or keypad to set the value in the
Level field in the Edge trigger mode. Setting these levels sets the threshold of
each input for high and low levels in the pattern. The trigger level marker
does not appear when Pattern mode triggering is selected.
The pattern for each input may be specified as high (H), low (L), or "don't
care" (X). H, L, and X conditions are as follows:
•
H − the voltage value of this input channel must be greater than the edge
trigger level of this input.
•
L − the voltage level of this input channel must be less than the edge
trigger level of this input.
•
X − is a "don't care" condition. The "don't care" means the associated
input channel will not be used in the pattern for the trigger qualifier. It
does not equate to "trigger on anything."
The default condition for all patterns is X, "don't care." To change the
pattern, touch the Channel/Pattern field. A pop-up keypad will appear which
allows you to assign the pattern conditions.
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