No Setup/Hold field on format screen
The HP 16540 and 16541 (A and D models), or HP 16542A logic analyzer
cards are not calibrated. Refer to your logic analyzer reference manual for
procedures to calibrate the cards.
No activity on activity indicators
On the HP 16510A Logic Analyzer, check the fuse that allows power to
the preprocessor interface.
On other logic analyzers, check for loose cables, board connections, and
preprocessor interface connections.
Check for bent or damaged pins on the preprocessor probe.
Capacitive loading
Excessive capacitive loading can degrade signals, resulting in incorrect
capture by the preprocessor interface, or system lockup in the
microprocessor. All preprocessor interfaces add additional capacitive loading,
as can custom probe fixtures you design for your application.
Careful layout of your target system can minimize loading problems and
result in better margins for your design. This is especially important for
systems that are running at frequencies greater than 50 MHz.
Remove as many pin protectors, extenders, and adapters as possible.
If multiple preprocessor interface solutions are available, try using one
with lower capacitive loading.
See Also Chapter 6 lists some application notes that discuss the problems of probing
high-speed digital systems.
If You Have a Problem
No Setup/Hold field on format screen
5–4
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