3 Spectrum Analyzer Mode
3.11 Harmonics Measurement
Command Return Value
:READ:HARMonics:AMPLitude:ALL?
than 10 harmonics are measured, zero is returned for any harmonic not
measured
:FETCh:HARMonics:DISTortion?
:MEASure:HARMonics:DISTortion?
:READ:HARMonics:DISTortion?
Returns the computed total harmonic distortion as a percentage
:FETCh:HARMonics:FREQuency:ALL?
:MEASure:HARMonics:FREQuency:ALL?
:READ:HARMonics:FREQuency:ALL?
Returns the frequency values of the first 10 harmonics in Hz
The first value returned is the fundamental. If fewer than 10 harmonics
are measured, zero is returned for any harmonic not measured
:FETCh:HARMonics:FUNDamental?
:MEASure:HARMonics:FUNDamental?
:READ:HARMonics:FUNDamental?
Returns the frequency of the fundamental in Hz
Some results queries support a numeric suffix, n, as below:
Command n Return Value
:FETCh:HARMonics:AMPLitude[n]?
:MEASure:HARMonics:AMPLitude
[n]?
:READ:HARMonics:AMPLitude[n]?
1– 10 Returns the amplitude values of the specified harmonic
If n = 1 is specified, the return value is in dBm. Otherwise, the
returned value is in dBc (relative to the fundamental)
:FETCh:HARMonics:FREQuency[n]?
:MEASure:HARMonics:FREQuency
[n]?
:READ:HARMonics:FREQuency[n]?
1– 10 Returns the frequency of the specified harmonic in Hz
If n = 1 is specified, the fundamental frequency is returned
:FETCh:HARMonics[n]?
:MEASure:HARMonics[n]?
:READ:HARMonics[n]?
1– 2 For n = 1, or n not specified, returns the computed total harmonic
distortion as a percentage
For n = 2, returns the computed total harmonic distortion in dBc
Harmonic Measurement Details
First Sweep
The first sweep of the harmonics measurement is used to find the fundamental
frequency and bandwidth.
First Sweep Initiation
The first sweep is not used when the range table is turned on, or when all
parameters are in “Manual” mode. It is only used when at least one of the following
parameters is in “Sense” mode:
1.
Fundamental frequency
2.
Resolution Bandwidth
Spectrum Analyzer Mode User's &Programmer's Reference 1849
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