7 Save/Recall/Print
7.3 Save
The first four rows specify: the file type (always MeasResult); the Mode and
Measurement IDs; the Firmware Revision; Instrument model number; and the
installed instrument options. The following shows typical contents for these rows.
Field 1 Field 2
MeasResult
BASIC:SPEC
A.23.05 N9040B
503 508 513 526 AKT ALV 1
The next three rows specify the Center Frequency, Res BW, and Span values. The
following shows typical contents for these rows.
Field 1 Field 2
Center Frequency 64047250.51
SPEC_ResBw 160000
SPEC_Span 8000000
Data Block
Following the Header Block, the Data Block consists of a list of results records. Each
record has 17 fields (columns), corresponding to the 17 measurement results
returned by :FETCh:SPECtrum[n]?. The first data row forms a header, containing
MeasResult1 to MeasResult17. Each set of measurement results is listed as a
subsequent line.
The MeasResult1 value in the file corresponds to the data returned by
:MEAS|READ|FETCh:SPECtrum1; the MeasResult2 value corresponds to the data
returned by :MEAS|READ|FETCh:SPECtrum2, and so on.
A summary appears below, and full details can be found in the Remote Command
Results table under "Complex Spectrum Measurement" on page 143.
Column Value
1 FFT peak, FFT frequency, FFT points, First FFT frequency, FFT spacing, Time domain points, First time point,
Time spacing, Time domain (1if time domain is complex and I/Q data will be returned, 0 if the data is real),
Scan time, average count
2 The trace data of the log-magnitude versus time. (That is, the RF envelope)
3 The I and Q trace data. It is represented by I and Q pairs (in volts) versus time. That is, the first value is I for
the first point, the second value is Q for the first point, the third value is I for the second point, and so on
4 The spectrum trace data. That is, the trace of log-magnitude versus frequency. (The trace is computed using
a FFT)
5 The averaged trace data of log-magnitude versus time. (That is, the RF envelope)
6 Not used
7 The averaged spectrum trace data. That is, the trace of the averaged log-magnitude versus frequency
8 Not used
IQ Analyzer Mode User's &Programmer's Reference 948
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