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Document Type: Example Program
NI Supported: Yes
Publish Date: Sep 6, 2006

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Use the FlexDMMs' 1.8 MS/s Digitizer Capability to Make Power Measurements

8 ratings | 4.12 out of 5
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Filename: flexdmm_power_measurements.zip
Requirements: View

Power measurements are accomplished by reading the voltage across, and current through, a load. However, the actual power calculation depends on the resistive and reactive components (capacitors and/or inductors) in the circuit. The power dissipation in a purely resistive circuit is always a function of the voltage drop and current draw through the circuit. Since DMMs are single-channel devices, two must be employed to implement a high-speed power measurement.

This VI illustrates how to configure two NI PXI-4070 FlexDMMs to make power measurements using their 1.8MS/s digitizer capability. The VI configures one FlexDMM to acquire voltage waveforms and configures the second FlexDMM to acquire a current waveform. The VI then uses built-in LabVIEW analysis routines to calculate the Real Power, Reactive Power, Apparent Power, Power Factor, and Phase of the acquired signals.

The attached .zip archive contains a set of VIs, most of which are in a folder called "subVIs." The top-level application is called "powerMeasurement.vi"

Requirements


Filename: flexdmm_power_measurements.zip

Software Requirements


Application Software: LabVIEW Full Development System 6.1
Language(s): LabVIEW

Hardware Requirements


Hardware Group: Digital Multimeters (DMM)
Hardware Model: PXI-4070, PXI-4072, PXI-4071
Driver: Traditional NI-DAQ (Legacy) 6.9.3, NI-DMM 2.1.0

 
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This example program (this "program") was developed by a National Instruments ("NI") Applications Engineer. Although technical support of this program may be made available by National Instruments, this program may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this program with each new revision of related products and drivers. THIS EXAMPLE PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).