Agilent Technologies ESA-E Series Programmer's Manual page 239

Language Reference
READ Subsyste m
Remarks :
The first value (for the fundamental) is measured i n
dBm; the remaining harmonics are measured in dBc . I f
fewer than ten harmonics are measured, zero is
returned for any harmonic not measured . Th e
harmonic amplitude precision for SCPI and the displa y
is two decimal places .
Front Panel
Access:
MEASURE,
Harmonic Dist
Return Harmonic N Amplitude
:READ :HARMonics :AMPLitude[n] ?
Returns the amplitude of harmonic number n, measured in dBc fro m
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 th e
display is two decimal places .
Front Panel
Access:
MEASURE,
Harmonic Dist
Return % Total Harmonic Distortio n
:READ :HARMonics[ :DISTortion] ?
Returns the computed total harmonic distortion as a percentage .
Range : 0 to float 64
Default Unit: %
Remarks:
The total harmonic distortion precision for SCPI and
the display is three significant digits .
Front Panel
Access :
MEASURE,
Harmonic Dist
Return Harmonic Frequency Lis t
:READ :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 analyzer
Default Unit: Hz
Chapter 5 5-79