AT-LA500
–
U
SER MANUAL
R
ELEASE
3.4
–
JUNE
2009
44
•
Connect as many grounds as possible to the system under test. All grounds are connected
together, therefore it is important to check all ground connections to avoid short circuits;
•
Once probes have been connected, check the input status on the
Channels Status
window to
verify that the visualized behavior corresponds to the expected one;
•
When active probes are used, set the threshold level to a value suitable to the signal nature;
•
If data acquisition is performed in the
State Analysis
mode, it is convenient to use active
probes for signal clocks. In this case a correct setting of threshold values allows using the
clock signal with the correct duty-cycle. Signal clocks, furthermore, must be (if possible...)
not affected by noise or disturbs that may activate erroneous acquisitions. Depending on
clock signal frequencies, it could be necessary to invert the trigger setting on edge
conditions to get a better acquisition;
•
If data acquisition is performed in the
Timing Analysis
mode or in the serial protocol
analysis, select the most suitable sampling frequency. If the sampling frequency is too low,
acquired data may be not coherent, while a too high frequency can evidence spikes or
propagation delays, furthermore reducing the useful acquisition time window.
