HP 54750A, User Manual, Page: 442 / 478

Standard and Enhanced Trigger Modes
The standard HP 83480A trigger has two bandwidth modes ,
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DC-2.5 GHz
and
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DC-100 MHz . The HP 83480A Option 100 adds two enhanced
bandwidth modes ,
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2-12 GHz and
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2-12 GHz Gate . This section describes
each mode and its applications .
DC-2.5 GHz mode
The DC-2.5 GHz mode is much like a traditional analog oscilloscope trigger .
It is DC coupled with an adjustable threshold level from 01.0 V to 1.0 V .
Either the positive or negative transition can be selected. There is a freerun
mode that allows the user to see the signal amplitude before a trigger has
been established. There is also a high sensitivity setting that reduces trigger
hysteresis for low-level, and low noise , signals .
The DC-2.5 GHz mode is used for the majority of applications because
it provides excellent performance for trigger signals up to 2.5 GHz and
has the most user-selectable options . Select this mode whenever eyeline
measurements are made .
DC-100 MHz mode
The DC-100 MHz mode adds a low-pass lter to the trigger path. This mode is
used for noisy low frequency trigger signals , because it can be used to reject
high frequency noise . DC-100 MHz mode allows more accurate triggering
in these applications , but will reduce the eective trigger bandwidth to
approximately 100 MHz .
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