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IM WT3001E-51EN
IEC Harmonic Measurement (Option)
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Index
9.1 IEC Harmonic Measurement Function
This mode in combination with the Harmonic/Flicker Measurement Software sold
separately allows you to perform harmonic measurement conforming to IEC 61000-3-
2. Use this mode to check that the harmonics of electric home appliances and office
automation equipment comply with the IEC standards.
• Connecting to the Harmonic/Flicker Measurement Software
For details on connecting this instrument to the Harmonic/Flicker Measurement
Software, see the user’s manual of the Harmonic/Flicker Measurement Software.
When you use the Harmonic/Flicker Measurement Software, this instrument enters
remote mode in which key operations on this instrument are disabled. The settings
described in the subsequent sections are set automatically or set from the setup
screen of the software.
Note
Do not release the remote mode of this instrument and change the settings while operating this
instrument with the Harmonic/Flicker Measurement Software. Doing so may impede harmonic
measurements conforming to the IEC standard. If you release the remote mode of this
instrument, close the Harmonic/Flicker Measurement Software.
• Limitations on the Function and Measurement Function
IEC harmonic measurement mode performs internal computation differently from
other measurement modes in order to achieve measurements conforming to the
IEC standard. Therefore, some functions such as waveform or bar graph display
on the screen, store function, motor evaluation function (option) cannot be used in
this measurement mode. In addition, some measurement functions such as peak
measurement, integration, and efficiency computation cannot be carried out. For a list
of functions with limitations and measurement functions that cannot be measured, see
appendix 10 and 11 in the
User’s Manual IM WT3001E-01EN
.
• Differences from Other Harmonic Measurement Modes
For the differences from the harmonic measurement in normal measurement mode
and wide bandwidth harmonic measurement mode, see “Harmonic Measurement
Types” in section 7.1.
• Voltage/Current Mode and Measured Values of Voltage U and Current I
The voltage/current mode settings are invalid in IEC harmonic measurement mode.
The voltage/current mode LED turns OFF. The voltage U and current I values that are
measured in this measurement mode are total values. For details on the total value,
see “Relationship between the Rms Values of Voltage U/Current I and Measurement
Modes” in section 7.1.
• Description of Other Functions Related to Harmonic Measurement
For a functional description of the items below, see section 7.1.
• Types of harmonic measurement functions
• Measurement period of harmonic measurement functions
• Numeric display related to harmonic measurement
• Equation for distortion factor
Chapter 9
IEC Harmonic Measurement (Option)