5 Programming Examples
252 Keysight Models 6811C, 6812C, and 6813C Programming Guide
Harmonic measurements
The MEASure and FETCh queries can return the amplitude and phase of up to the
50th harmonic of voltage and current. They can also return the total harmonic
distortion in the output voltage or current. For example, to return readings for an
individual harmonic component, use the following commands:
MEASure:CURRent:HARMonic:AMPLitude? <harmonic_number>
MEASure:CURRent:HARMonic:PHASe? <harmonic_number>
MEASure:VOLTage:HARMonic:AMPLitude? <harmonic_number>
MEASure:VOLTage:HARMonic:PHASe? <harmonic_number>
Harmonic numbers are related to the programmed frequency of output voltage.
Queries sent with an argument of 0 return the DC component. An argument of
1 indicates the fundamental frequency, 2 indicates the second harmonic,
3 indicates the third, and so on. The maximum harmonic component that can be
read is limited by the fundamental measurement bandwidth, which is 12.5 kHz.
An error is generated if a query is sent for a harmonic that has a frequency greater
than 12.5 kHz. To return all the harmonic components with a single query, use the
following commands:
MEASure:ARRay:CURRent:HARMonic:AMPLitude?
MEASure:ARRay:CURRent:HARMonic:PHASe?
MEASure:ARRay:VOLTage:HARMonic:AMPLitude?
MEASure:ARRay:VOLTage:HARMonic:PHASe?
These queries always return 51 data values, from the DC component up to the
50th harmonic. Any harmonics that represent frequencies greater than 12.5 kHz
are returned as the value 0. To return the percentage of total harmonic distortion
in the output voltage or current, use the following commands:
MEASure:CURRent:HARMonic:THD?
MEASure:VOLTage:HARMonic:THD?
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