Agilent Technologies ESA-E Series Programmer's Manual page 210

Language Reference
FETCh Subsystem
Default Unit: dBm (fundamental); dBc (all others)
Remarks : The first value (for the fundamental) is measured i n
dBm; the remaining harmonics are measured in dBc. If
fewer than ten harmonics are measured, zero is
returned for any harmonic not measured . The
harmonic amplitude precision for SCPI and the display
is two decimal places .
Front Panel
Access: MEASURE,
Harmonic Dis t
Return Harmonic N Amplitude
:FETCh :HARMonics :AMPLitude[n] ?
Returns the amplitude of harmonic number n, measured in dBc from
the fundamental, or in dBm if n=1 .
Range : -180 dBm to 70 dB m
Default Unit : dBc (from fundamental) ; dBm (n=1 )
Remarks : The harmonic amplitude precision for SCPI and the
display is two decimal places.
Front Panel
Access: MEASURE,
Harmonic Dist
Return % Total Harmonic Distortio n
:FETCh :HARMonics[ :DISTortion] ?
Returns the computed total harmonic distortion as a percentage .
Range : 0 to float64
Default Unit : %
Remarks : The total harmonic distortion precision for SCPI and
the display is three significant digits .
Front Panel
Access: MEASURE,
Harmonic Dis t
Return Harmonic Frequency Lis t
:FETCh :HARMonics :FREQuency :ALL ?
Returns a comma-separated list of the frequencies of the ten harmonics ,
measured in Hz .
Range : 0 Hz to the maximum frequency range of the analyze r
Default Unit : Hz
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Chapter 5