Agilent Technologies E4406A, Руководство пользователя

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86 Chapter 4
Making Measurements
Preparing for Measurements
•
Video
- Is an internal IF envelope trigger. It triggers on an absolute
threshold level of the signal passed by the IF.
•
RF Burst
- Is an internal wideband RF burst trigger that has an
automatic level control for burst signals.
•
Ext Front
- Activates the front panel
Ext Trigger Input
. The external
trigger must be a signal between
−
5 and +5 volts.
•
Ext Rear
- Activates the rear panel
Trigger In
. The external trigger
must be a signal between
−
5 and +5 volts.
• Frame - Uses the internal frame clock to generate a trigger signal.
The clock parameters are controlled under the
Mode Setup
key or the
measurement firmware, not both. See the specific measurement for
details.
• Line - Activates an internal line trigger. Sweep triggers occur at
intervals synchronized to the line frequency.
Rear panel
TRIGGER 1 OUT
and
TRIGGER 2 OUT
connectors are coupled
to the selected trigger source. These trigger outputs are always on the
rising edge with a pulse width of at least 1
µ
s.