Keysight Technologies FieldFox A Series, Руководство пользователя

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Keysight N9927-90001 User’s Guide 173
SA (Spectrum Analyzer) Mode
SA Mode Settings
Trigger Slope
Trigger Slope determines which edge of an External, Video, or RF Burst trigger
signal initiates a sweep.
— Press Sweep 3
— Then Trigger Settings
— Then Trig Slope
— Then choose from the following:
— Po Sweep is triggered by the rising (positive) edge of signal.
— Neg Sweep is triggered by the falling (negative) edge of signal.
Trigger Delay
After a valid trigger signal is received, the sweep begins after the specified
Trigger Delay time.
To see the rising edge of a repetitive signal which is triggered on that edge,
enter a negative trigger delay value (also known as pre-trigger). Adjust the
sweep time to observe the pre-trigger time if necessary.
— Press Sweep 3
— Then Trigger Settings
— Then Trig Delay
— Enter a value using the numeric keypad, the arrows, or the rotary
knob.
— Then select a multiplier key or press Enter . Learn more in “Multiplier
Abbreviations” on page 43 .
In Zero span, you can use Trigger Position as an easy way to set Trigger Delay
by positioning the trigger event on the FieldFox screen. See “Triggering” on
page 172 .
Trigger Level
Used with Video and RF Burst triggering, a sweep is initiated when an
incoming signal crosses this level. The units depend on the Units setting. Learn
more in “Scale and Units” on page 153 .
RF Burst Trigger Level uses an alignment process which is performed in the
background to set the detected signal level accuracy. Learn more in “RF Burst
Amplitude Alignment” on page 186 . Video Trigger Level is a zero span signal
level comparison. Therefore, the sweep will trigger close to the displayed level
in zero span measurements. In non-zero span measurements, processing can
cause broadband signal energy to display at lower power levels than the
originating time domain signal. Therefore, you may need to set the trigger level
higher than the displayed level.