User`s guide

3-33

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

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 pattern. If all channels

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.