Agilent Technologies Infiniium 90000 Q-Series, Programmer'S Manual

Page: 535 / 1186

Measure Commands
25
Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference 535
:MEASure:FFT:DMAGnitude
Command
:MEASure:FFT:DMAGnitude [<source>]
The :MEASure:FFT:DMAGnitude command enables the delta magnitude
measurement. 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:DMAGnitude? [<source>]
The :MEASure:FFT:DMAGnitude? query returns the delta magnitude of the
specified peaks.
Returned Format
[:MEASure:FFT:DMAGnitude] <delta_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.
Related
Commands
:MEASure:FFT:PEAK1, :MEASure:FFT:PEAK2, :MEASure:FFT:THReshold
Example This example measures the magnitude difference between the peaks
specified by the :meas:fft:peak1 and :meas:fft:peak2 for channel 4.
myScope.WriteString ":SYSTEM:HEADER OFF" ' Response headers off.
myScope.WriteString ":func4:fftm chan4" ' Perform FFT on channel 4.
myScope.WriteString ":func4:disp on" ' Display the FFT.
myScope.WriteString ":meas:FFT:thr-47" ' Set peak threshold at-47 dBm.
myScope.WriteString ":meas:FFT:Peak1 2" ' Meas between peak 2 and 3.
myScope.WriteString ":meas:FFT:Peak2 3"