Keysight U1241C Guide De Mise En Route page 13

Measuring harmonic ratio (U1242C only)
The harmonic ratio function indicates the
deviation of non-sinusoidal to sinusoidal
waveform from the range of 0% to 100%, which
indicates the presence of harmonics. A higher
harmonic ratio means more harmonics are
present on the signal.
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[1]
AC V (true rms) AC V (averaging sense)
Harmonic ratio with Harmonic ratio with
AC V (true rms) AC V (averaging sense)
[1] Averaging sense AC measurements apply to sine wave inputs
when measuring linear loads.
Keysight U1241C/U1242C Quick Start Guide 13