AMETEK Lx Series II Programming Manual - Manual (Page 144)

Programming Manual Lx \ Ls Series II
140
MEASure:CURRent:DC?
To measure the maximum current amplitude and the current crest factor, use:
MEASure:CURRent:AMPLitude:MAXimum?
MEASure:CURRent:CREStfactor?
6.8.2 Power Measurements
The MEASure and FETCh queries can return real, apparent, and reactive power measurements
as well as dc power and power factor using the following commands:
MEASure:POWer:AC:APParent? measures the ac component of apparent power in VA
MEASure:POWer:AC:REACtive? measures the reactive power
MEASure:POWer:AC:REAL? measures the in-phase component of power in watts
MEASure:POWer:AC:PFACtor? returns the output power factor
MEASure:POWer:AC:TOTal? measures the total real power being sourced
MEASure:POWer:DC? measures the dc component of power
6.8.3 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 16 kHz. An error is generated if a query is sent for a harmonic that has a
frequency greater than 16 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 16 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?