Measure:fft:magnitude - Agilent Technologies Infiniium 90000 Series Programmer's Manual

25
Measure Commands

:MEASure:FFT:MAGNitude

Command
:MEASure:FFT:MAGNitude [<source>]
The :MEASure:FFT:MAGNitude command measures the magnitude of the
FFT. The source is specified with the :MEASure:SOURce command or with
the optional parameter following the :MEASure:FFT command.
The source must be a function that is set to FFT, or a waveform memory
that contains an FFT for this command and query to work.
<source> {FUNCtion<F> | WMEMory<N> | CLOCk | MTRend | MSPectrum |
EQUalized}
MTRend and MSPectrum sources are only available if the oscilloscope has
the EZJIT option installed and the feature is enabled.
The CLOCk source is only available if the oscilloscope has the High Speed
Serial option installed and the feature is enabled.
The EQUalized source is only available if the oscilloscope has the High
Speed Serial option and the Serial Data Equalization option installed and
the features are enabled. This command uses the Feed- Forward Equalized
(FFE) signal as the source.
<N>
WMEMory<N> is an integer, 1- 4.
<F>
FUNCtion<F> is an integer, 1- 16.
Query

:MEASure:FFT:MAGNitude?

The :MEASure:FFT:MAGNitude? query returns the magnitude value of the
FFT.
Returned Format
[:MEASure:FFT:FMAGNitude] <magnitude>[,<result_state>]<NL>
<result_state> If SENDvalid is ON, the result state is returned with the measurement
result. See the :MEASure:RESults table in this chapter for a list of the
result states.
Example This example measures the magnitude of the peak specified by the
:meas:fft:peak for channel 4.
myScope.WriteString ":SYSTEM:HEADER OFF"
myScope.WriteString ":func4:fftm chan4"
myScope.WriteString ":func4:disp on"
myScope.WriteString ":meas:FFT:thr-47" ' Set peak threshold at-47 dBm.
myScope.WriteString ":meas:FFT:Peak1 2"
myScope.WriteString ":meas:FFT:magn func4"
myScope.WriteString ":meas:FFT:magn? func4" ' Query for measurement.
varMagnitude = myScope.ReadNumber
Debug.Print FormatNumber(varMagnitude, "Scientific")
538 Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference
' Response headers off.
' Perform FFT on channel 4.
' Display the FFT.
' Meas magnitude of peak 2.
' Perform magnitude meas.