beautypg.com

AMETEK Lx Series II Programming Manual User Manual

Page 59

background image

Programming Manual

Lx \ Ls Series II

55

Query Syntax

MEASure[:SCALar]:CURRent:NEUTral:HARMonic

[:AMPLitude]?

FETCh[:SCALar]:CURRent:NEUTral:HARMonic

[:AMPLitude]?

Parameters

0 to 50

Examples

MEAS:CURR:NEUT:HARM? 3 FETC:CURR:NEUT:HARM? 1

Returned Parameters

Related Commands

INST:NSEL

MEASure:CURRent:NEUTral:HARMonic:PHASe?
FETCh:CURRent:NEUTral:HARMonic:PHASe?

These queries return the phase angle of the Nth harmonic of current in the neutral output terminal
of a three-phase, referenced to the positive zero crossing of the fundamental component.

The parameter is the desired harmonic number. Queries sent with a value of 0 return the dc
component. A value of 1 returns the fundamental output frequency. Harmonic orders can be
measured up to the fundamental measurement bandwidth of the measurement system, which is
16 kHz. Thus, the maximum harmonic that can be measured is dependent on the output
frequency. Any harmonics that represent frequencies greater than 16 kHz are returned as 0.

Query Syntax

MEASure[:SCALar]:CURRent:NEUTral:HARMonic

:PHASe?

FETCh[:SCALar]:CURRent:NEUTral:HARMonic

:PHASe?

Parameters

0 to 50

Examples

MEAS:CURR:NEUT:HARM:PHAS? 3

FETC:CURR:NEUT:HARM:PHAS? 1

Returned Parameters

Related Commands

INST:NSEL

MEASure:THDistortion:MODE

This command sets the calculation method for THD measurements. The distortion calculation is
based on the H2 through H50 with the RMS voltage or current in the denominator. Note that some
definitions of THD use the fundamental component (H1) of the voltage or as the denominator.

Lx/Ls units with firmware revision 0.88 or higher can be programmed to use the fundamental
component as the denominator instead of the RMS value. This mode can only be programmed
over the bus by sending the “MEAS:THD:MODE FUND” command. At power up or after a reset
command, the mode will revert back to the RMS mode. This mode setting is not saved in any of
the set up registers.

Syntax

MEASure:THDistortion:MODE

Parameters

RMSQuare | FUNDamental

Examples

MEAS:THD:MODE FUND

Query Syntax

MEAS:THD:MODE?

Returned Parameters

Related Commands

MEAS:VOLT:HARM:THD?

MEAS:CURR:HARM:THD?