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Programming Manual Compact i / iX Series
AMETEK Programmable Power Division 139
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? <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 48 kHz. An error is generated if a query is sent for a harmonic that has a
frequency greater than 48 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 48 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?
- Compact i/iX 1
- AC and DC Power Source 1
- Programming Manual 1
- WARNING 4
- WARRANTY TERMS 5
- PRODUCT RETURN PROCEDURE 5
- 1. Introduction 9
- 1.2.1 Phase Selection 10
- 1.2.2 Firmware differences 10
- 1.2.3 Hardware differences 10
- 2. Introduction to SCPI 13
- 2.2.3 The SCPI Command Tree 14
- 2.3 Using Queries 16
- 2.4 Coupled Commands 16
- 2.5.3 Headers 17
- 2.5.4 Query Indicator 18
- 2.5.6 Root Specifier 18
- 2.5.7 Message Terminator 18
- 2.6 SCPI Data Formats 19
- 3. System Considerations 20
- 3.2 USB Interface 21
- 3.2.2 USB Interface Use 27
- 3.3 RS232 Interface 28
- 3.4 LAN Option 28
- 3.4.5 Socket Port Number 32
- 4. SCPI Command Reference 33
- 4.2 Subsystem Commands 34
- 4.3 Calibration Subsystem 35
- 4.4 Diagnostic Subsystem 37
- 4.5 Display Subsystem 38
- 4.6 Instrument Subsystem 40
- 4.7 Limit Subsystem 41
- 4.13 Output Subsystem 60
- 4.14 Power On Subsystem 64
- 4.25 System Commands 101
- 4.27 Trigger Subsystem 109
- (default) 110
- 5. Common Commands 114
- 5.1 *CLS 115
- 5.2 *ESR? 116
- 5.3 *IDN? 116
- 5.4 *OPC 116
- 5.5 *OPT? 117
- 5.6 *PSC 117
- 5.7 *RCL 118
- 5.8 *RST 119
- 5.9 *SAV 120
- 5.10 *SRE 120
- 5.11 *STB? 121
- 5.12 *TRG 121
- 5.13 *TST? 121
- 5.14 *WAI 122
- 6. Programming Examples 123
- 6.2.1 Waveform Shapes 125
- 6.2.2 Individual Phases 126
- 6.3 Coupled Commands 127
- 6.6 List Transients 132
- 6.7.7 Generating Triggers 137
- 6.8 Making Measurements 138
- 6.8.2 Power Measurements 139
- 6.8.3 Harmonic Measurements 139
- 6.10.2 Download Sample 148
- 7.1 Power-On Conditions 150
- 7.2 Operation Status Group 150
- 7.6 Status Byte Register 156
- 7.7 Examples 157
- 7.8.1 Remote Inhibit (RI) 160
- 7.9 SCPI Command Completion 161
- 8. Option Commands 162
- 8.2 RTCA/DO-160D (-160) 163
- VOLTAGE SURGE, for details 165
- 8.3.1 Command Tree 170
- 8.4.1 Command Tree 177
- 8.9.1 Introduction 194
- 8.9.2 ABLE Language details 195
- 8.9.3 Language Extension 198
- 8.10 Watt Hour Meter (-WHM) 199
- Appendix C : Error Messages 207
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