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Triggering the Oscilloscope
To use Sequence triggering
Define the Find: stage
1Press the Stage softkey and select Find:.
Find: is the first stage in the trigger sequence. When you select the Stage Find
softkey, the next softkey to the right will display Find: and give you a list of the
terms you can define for the Find stage. The Find stage can be set to one of the
following conditions:
Pattern 1 Entered – A pattern is entered on the last edge that makes the
pattern true (logical AND).
Pattern 1 Exited – A pattern is exited on the first edge that makes the pattern
false (logical NAND).
Edge 1
Pattern 1 and Edge 1
2Press the Find: softkey and select the Find stage condition.
3 To define the term(s) used in the Find stage, press the
Term softkey and
select the pattern and/or edge term displayed in the
Find: softkey.
4 If you select a pattern term, each channel in the pattern must be set to
a
H (high), L (low), or X (don’t care).
a Press the Channel softkey (or rotate the Entry knob on mixed-signal
oscilloscopes) to select the channel.
As you select a channel, the channel is highlighted in the selected pattern
list shown in the waveform area and is also shown in the upper-right corner
of the display next to "Seq"
b Press the L H X softkey to set a level for the channel.
• H sets the pattern to high on the selected channel. A high is a voltage level
that is greater than the channel's trigger level or threshold level.
• L sets the pattern to low on the selected channel. A low is a voltage level
that is less than the channel's trigger level or threshold level.
• X sets the pattern to don't care on the selected channel. Any channel set
to don't care is ignor ed and is not used as part of the patt ern. If all channel s
in the pattern are set to don't care, the oscilloscope will not trigger.
Adjust the trigger level for the selected analog channel by turning the
Trigger Level knob. Select Threshold in the D7 Thru D0 or D15 Thru D8 menu
to set the level for the digital channel group. The value of the trigger level
or digital threshold is displayed in the upper-right corner of the display.
c Repeat for all channels in the pattern.