Glitch Acquisition Mode - HP 1652B Getting Started Manual

HP 16528/1653B
Front-Panel Reference
Traditional timing samples and stores data at regular intervals.
Transitional timing samples data at regular intervals but stores a
sample only when there has been a transition on one or more of the
channels. This makes it possible for Transitional timing to store more
information in the same amount of memory.
Glitch Acquisition Mode
A glitch is defined as anv transition that crosses logic threshold more
than once between Sam&es. It can be caused by capacitive coupling
between traces, by power supply ripples, or a number of other events.
Since a glitch can cause major problems in your system, you can use the
Glitch mode to find it.
Your logic analyzer has the capability of triggering on a glitch and
capturing all the data that occurred before it. The glitch must have a
width of at least 5 ns at threshold in order for the analyzer to detect it.
If you want your timing analyzer to trigger on a glitch in the data, set
the Acquisition mode to Glitch. This causes several changes in the
analyzer. One change is that a field for glitch detection in each label is
added to the Timing Trace Specification menu, as shown:
Then find
Edge 1
or
Glitch=
Figure 18-4. Glitch Specification Field
With these glitch detection fields you specify on which channel or
channels you want the analyzer to look for a glitch. These fields are
discussed in more detail in "Then Find Edge" later in this chapter.
Glitch Acquisition mode causes the storage memory to be cut in half
from lk to 512. Half the memory
(512)
is allocated for storing the data
sample, and the other half for storing the second transition of a glitch
in a sample. Every sample is stored.
Timing Trace Specification Menu
18-5