Agilent Technologies ESA-E Series Programmer's Manual page 240

Language Reference
READ Subsystem
Remarks: If fewer than ten harmonics are measured, zero is
returned for any harmonic not measured . The
harmonic frequency precision for SCPI and the display
is four significant digits .
Front Panel
Access : MEASURE, Harmonic Dist
Return Harmonic N Frequency
:READ :HARMonics :FREQuency[n] ?
Returns the frequency of harmonic number n (2 to 10), measured in Hz .
Range : 0 Hz to the maximum frequency range of the analyze r
Default Unit : H z
Remarks: The harmonic frequency precision for SCPI and the
display is four significant digits .
Front Panel
Access : MEASURE, Harmonic Dist
Return Fundamental Frequency
:READ :HARMonics :FUNDamental ?
Returns the frequency of the fundamental, measured in Hz .
Range : 0 Hz to the maximum frequency range of the analyze r
Default Unit: Hz
Remarks: The harmonic frequency precision for SCPI and th e
display is four significant digits .
Front Panel
Access : MEASURE, Harmonic Dist
Measure OBW and Transmit Frequency Error
:READ :OBWidth ?
This command returns scalar results of occupied bandwidth, an d
transmit frequency error.
Remarks: The results for both values are returned in Hz and in a
comma-separated list .
5-80 Chapter 5