HP 54620A, Руководство пользователя и сервисное руководство

Страница: 201 / 243

Table 20 Trigger System
General Sources All Channels & External.
Auto/Normal Operation Auto will produce a free-running display if the
trigger is not found. Normal causes the analyzer to
wait indefinitely for a trigger to start acquiring data.
Modes Edge, Pattern, and Advanced.
Edge A single edge can be specified on channels 0-15
and External. Edge may be rising, falling, or either.
Pattern Analyzer will trigger upon entering a pattern of
high, low and don’t care levels on all of the
channels and external trigger input. A single edge
(rising, falling or either) can be ANDed with this
pattern; the edge then determines when the trigger
will occur.
Advanced Two pattern and edge terms can be combined with
operators to create a very specific trigger event.
Advanced Operators AND, OR, Then, Entered, Exited, Duration > time,
Duration < time, and Occurs N times.
Maximum Occurrence 2
20
–1.
Edge Recovery Time Sweep speeds of 5 nS/div to 1
µ
S/div: 28 ns
Sweep speeds of 2
µ
s/div and slower: 20 ns +1
sample period.
Minimum Pattern
Setup to Edge for
Trigger 3 ns + channel-to-channel skew for all sample
periods.
Minimum Pattern Hold
to Edge for Trigger 5 ns + channel-to-channel skew for all sample
periods.
Minimum Detectable
Pattern Width 13 ns + channel-to-channel skew at sweep speeds
of 5 nS/div to 1
µ
S/div. At sweep speeds of 2
µ
s/div
and slower = (1 ns + 1 sample
channel-to-channel skew + 0.01%).
Minimum Settable
Duration At all sweep speeds = 2 sample periods or 16 ns,
which ever is greater.
Performance Characteristics
200