Keysight Technologies FieldFox A Series, User Manual

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478 Keysight N9927-90001 User’s Guide
Pulse Measurements Mode – Option 330
Pulse Measurement Settings
— Then Auto Trigger
— Then choose from the following:
— ON Trigger level is determined by the USB Power Sensor firmware.
— OFF The trigger level is set manually using the Trigger Level setting.
Trigger Level
Used when Trigger Type = Internal AND Auto Trigger = OFF (Manual).
— Press Sweep 3
— Then Trigger
— Then Trig Level
— Then set the trigger level using the numeric keypad, the arrows, or the
rotary knob. A line appears on Tr 1 at the current trigger level setting. Data
acquisition occurs when the RF input signal crosses the line. This setting
can be used with either Positive or Negative edge triggering.
Qualification
Use the qualification setting to avoid triggering on false pulses and to aid in
stabilizing the power trace.
The qualification time defines the time the signal has to remain below the
trigger threshold before a transition through the threshold will qualify as a
trigger. This can help stabilize a power trace, particularly with digitally
modulated pulses that may have many transitions through the trigger
threshold. By setting the qualification time longer than the short transitions of
the data signal the sensor will reliably trigger on the pulse and not on the data.
It will also eliminate triggering on very short noise spikes when the trigger level
has to be set to low power.
— Press Sweep 3
— Then Trigger
— Then Qualification
— Then set the qualification value using the numeric keypad or the rotary knob
(default: 100 ns, minimum: 25 ns, maximum: 50
μ
s).
It may be may be necessary to set the qualification time to the minimum
20 ns in order to trigger on very short pulses .