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Posttrigger Data
The data acquired and displayed after the trigger event. You can set the amount of pretrigger data
with the Horizontal Position control.
Pretrigger Data
The data points of the waveform acquired and displayed before the trigger event. You can set the
amount of pretrigger data with the Horizontal Position control.
Quality Factor
Quality factor is the ratio of eye size to noise.
Quality Factor = (PTopmean – PBasemean)/(PTopsigma + PBasesigma)
Real Number
Inserts the text SpectralReal( ) into the math expression. Select one of the waveforms as an
argument to the function. This function creates a waveform that displays only the real part of the
FFT.
Reference Point
Use the Ref Point control to define the horizontal reference point within the acquired waveform.
The horizontal reference point determines the location within the acquired data where the scale
controls will expand or contract the waveform. When Horizontal Delay is on, the reference point
is the trigger point plus the Horizontal Delay time. When the horizontal delay is off, the reference
point is the trigger point.
Resolution Bandwidth
The resolution bandwidth controls the bandwidth of the spectral analyzer filters. You can adjust
the resolution bandwidth in units of hertz. The resolution bandwidth is measured at the −3 dB
points on each side of the peak spectral lobe of the filter.
Resolution bandwidth is inversely proportional to the gate duration in the time domain. Changing
the gate duration changes the resolution bandwidth. Changing the spectral analyzer window
function also changes the resolution bandwidth but will not affect the gate duration.
To decrease the resolution bandwidth beyond the present limits, increase the time domain gate
duration. If this is insufficient, increase the record length and then increase the gate duration again.
You can also try the rectangular or Hamming window to maximize the frequency resolution
(minimize resolution bandwidth).
Rise Time
This timing measurement is the time required for the leading edge of the first pulse in the
waveform or gated region to rise from the low reference value (default = 10%) to the high
reference value (default = 90%) of the final value.
RMS
This voltage measurement is the true Root Mean Square voltage over the entire waveform or gated
region.
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