Stanford Research Systems SR785, Operating Manual And Programming Reference

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5-28 Frequency Commands
SR785 Dynamic Signal Analyzer
Frequency Commands (FFT and Correlation)
FSPN (?) d {, f} <kHz, [Hz], mHz,
µµµµ
Hz>
The FSPN command sets (queries) the FFT frequency Span of display d. The
parameter f is a real number representing the span in the selected units. The
available spans depend upon the FFT Base Frequency.
The set command changes the FFT Span to the available span closest to f.
The query command always returns the span in Hz.
This command is valid only when the Measurement Group is FFT or Correlation.
The set command requires display d to be Live.
FLIN (?) d {, i}
The FLIN command sets (queries) the Resolution of display d when the
measuremen group is FFT or Correlation. The parameter i selects 100 (0), 200
(1), 400 (2) or 800 (3) lines. FLIN does not change the Span.
This command is valid only when the Measurement Group is FFT or Correlation.
The set command requires display d to be Live.
FBAS (?) d {, i}
The FBAS command sets (queries) the FFT Base Frequency of display d. The
parameter i selects 100.0 kHz (0) or 102.4 kHz (1).
To set the Base Frequency, d must be 2 (both displays). There is only one Base
Frequency for both displays. Changing the Base Frequency will affect all of the
FFT and source frequency parameters.
This command is valid only when the Measurement Group is FFT, Correlation,
or Time/Histogram. The set command requires at least one display to be Live.
FSTR (?) d {, f} <kHz, [Hz], mHz,
µµµµ
Hz>
The FSTR command sets (queries) the FFT Start frequency of display d. The
parameter f is a frequency (real number of the specified units). Values of f which
would cause the span to exceed the 0 to 102.4 (100.0) kHz range cause an error.
This command is valid only when the Measurement Group is FFT. The set
command requires display d to be Live.
Since correlation is always a baseband measurement, this command is not valid
when the measurement group is correlation.
FCTR (?) d {, f} <kHz, [Hz], mHz,
µµµµ
Hz>
The FCTR command sets (queries) the FFT Center frequency of display d. The
parameter f is a frequency (real number of the specified units). Values of f which
would cause the span to exceed the 0 to 102.4 (100.0) kHz range cause an error.