AMETEK BPS Series Programming Manual - Manual (Page 158)

AMETEK Programmable Power BPS / MX / RS Series SCPI Programming Manual
158 Manual P/N 7003-961 Rev AA
6.6.4 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?
MEASure:CURRent:HARMonic:PHASe?
MEASure:VOLTage:HARMonic:AMPLitude?
MEASure:VOLTage:HARMonic:PHASe?
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 19.53 kHz for a single phase configuration and 6.51kHz
for three phase configuration. An error is generated if a query is sent for a harmonic that has
a frequency greater than the bandwidth above. 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 the numeric
option field if present or the 50th harmonics. Any harmonics that represent frequencies
greater than the measurements bandwidth 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?