HP 54520 Series - Pattern Trigger Mode

See also
Figure 5-5
Trigger
Pattern Trigger Mode
Pattern Trigger Mode
Pattern allows you to have the oscilloscope search for a pattern that you
define. You can define a pattern using any channel and external trigger (on
the 2-channel models), up to a 4-bit pattern on 4-channel models and up to a
3-bit pattern on 2-channel models. The oscilloscope triggers on the last edge
to make the condition true, or the first edge that makes the condition false as
set by the when softkey. You define a pattern by assigning each trigger
source either as an L, X, or H (L = low, X = don’t care, and H = high). A high
is a voltage above the trigger level, and a low is a voltage below the trigger
level. The thresholds for the channel trigger levels (or H/L levels) are set in
the edge trigger menu.
You can use the pattern mode to detect glitches greater than 20 ns wide,
however, use the glitch trigger mode to detect glitches less than 20 ns wide.
"Glitch Trigger Mode" later in this chapter for information on capturing and
differentiating glitch widths less than 20-ns.
fall = XX e PATTERN TRIGGER
trag’a
—ho dof!
- holgort
time UIT
panezoza
5-9