Agilent Technologies X Series Manual page 216

Complex Spectrum Measurement
n Results Returned
not specified or Returns the following comma-separated scalar results:
n=1
1. FFT peak is the FFT peak amplitude.
2. FFT frequency is the FFT frequency of the peak amplitude.
3. FFT points is the Number of points in the FFT spectrum.
4. First FFT frequency is the frequency of the first FFT point of the spectrum.
5. FFT spacing is the frequency spacing between the FFT points of the spectrum.
6. Time domain points is the number of points in the time domain trace used for the FFT.
The number of points doubles if the data is complex instead of real. See the time domain
scalar description below.
7. First time point is the time of the first time domain point, where time zero is the trigger
event.
8. Time spacing is the time spacing between the time domain points. The time spacing
value doubles if the data is complex instead of real. See the time domain scaler description
below.
9. Time domain returns a 1 if time domain is complex (I/Q) and complex data will be
returned. It returns a 0 if the data is real. (raw ADC samples) When this value is 1 rather
than 0 (complex vs. real data), the time domain points and the time spacing scalers both
increase by a factor of two.
10. Scan time is the total scan time of the time domain trace used for the FFT. The total
scan time = (time spacing) (time domain points 1)
11.Current average count is the current number of data measurements that have already
been combined, in the averaging calculation.
2 Returns the trace data of the log-magnitude versus time. (That is, the RF envelope.)
3 Returns the I and Q trace data. It is represented by I and Q pairs (in volts) versus time.
4 Returns spectrum trace data. That is, the trace of log-magnitude versus frequency. (The
trace is computed using a FFT.)
5 Returns the averaged trace data of log-magnitude versus time. (That is, the RF envelope.)
6 Not used.
7 Returns the averaged spectrum trace data. That is, the trace of the averaged log-magnitude
versus frequency.
8 Not used.
9 Returns a trace containing the shape of the FFT window.
10 Returns trace data of the phase of the FFT versus frequency.
11 Returns comma-separated linear spectrum trace data in Volts RMS.
12 Returns comma-separated averaged linear spectrum trace data in Volts RMS.
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