Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.11 Harmonics Measurement
3.11 Harmonics Measurement
IMPORTANT
This measurement is not supported in VXT models M9410A/11A/15A/16A.
The Harmonics measurement allows a simple (one-button) measurement of the
harmonics of a specified carrier frequency.
At each cycle, the instrument will do a zero-span measurement at the fundamental
and at each harmonic frequency. With that information, it will calculate and report
each harmonic in dBc, and will also calculate and report the total harmonic
distortion.
In most use cases, this approach is sufficient. In cases where a specialized harmonic
measurement is required, such as measuring the harmonics of a baseband amplifier
when looking at the carrier signal, the user may separately specify the parameters of
each harmonic measurement.
For measurement results and views, see "Views" on page 1850.
Harmonics Measurement Commands
These commands are used to initialize the measurement, and to retrieve results.
The general functionality of "CONFigure" on page 2753, "INITiate" on page 2754,
"FETCh" on page 2754, "MEASure" on page 2756, and "READ" on page 2755 are
described in the section SCPI Operation and Results Query in the topic
Programming the Instrument.
:INITiate:HARMonics
Initiates a trigger cycle for the measurement, but does not return any data
Does not change any measurement settings
:CONFigure:HARMonics
Selects the measurement with Meas Setup settings in their preset states.
This is the same as "Meas Preset" on page 1917
:CONFigure:HARMonics:NDEFault
Selects the HARM measurement without affecting settings
:CONFigure?
Returns the name of the measurement: HARM
The queries listed below retrieve each harmonic measurement, and the Total
Harmonic Distortion calculated from the measurement. Returned amplitudes are in
fixed units, and do not honor the Y Axis Unit setting. Returned absolute amplitudes
are affected by "Ref Level Offset" on page 1858, and returned absolute frequencies
are affected by "Freq Offset" on page 1908.
Command Return Value
:FETCh:HARMonics:AMPLitude:ALL?
:MEASure:HARMonics:AMPLitude:ALL?
Returns the amplitude values of the first 10 harmonics
The first value (for the fundamental) is measured in dBm. The remaining
harmonics are measured in dBc (relative to the fundamental). If fewer
1848 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)