214 Keysight N9927-90001 User’s Guide
RTSA (Real-Time Spectrum Analyzer) Mode—Option 350 (CPU2 Only)
RTSA Mode Settings
— Video A sweep is initiated when the amplitude of an incoming signal
crosses the settable trigger level. The comparison is done in the time
domain, before conversion to frequency domain. Refer to “Trigger Slope”,
“Trigger Delay”, “Trigger Level” on page 215, “Auto Trigger Time” on
page 215, and to “Trigger Hold-Off” on page 216.
— RF Burst A sweep is initiated when the signal at the third IF (analog) stage
crosses the settable Trigger Level. This selection reacts to a wider
bandwidth of the incoming signal than Video Trigger, which could be
beneficial. However, RF Burst is not as sensitive to triggering on low-level
signals. Refer to “Trigger Slope”, “Trigger Delay”, “Trigger Level” on
page 215, “Auto Trigger Time” on page 215, and to “Trigger Hold-Off” on
page 216.
— Periodic
Trigger repeats at the period rate entered. Periodic trigger’s phase
can be altered by the Offset value.
Then choose from the following:
— Period
Enter a value for the trigger to repeat (100 ns to 400 ms).
— Offset
Enter a offset value to offset the phase of the periodic trigger
(–100 ms to 100 ms).
— Reset Offset Display
Resets Offset to default 0.000000 s.
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:
— Pos
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.
—Press Sweep 3
If your trigger level is set too high for the current measurement gain setup,
you will see an error message, similar to this one, displayed: "Video
TrigLevel was HW Limited, it is x.xx dB above current capability". Adjust
your trigger level settings until the message is no longer displayed.
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