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8-1
IM WT3001E-51EN
W
ide Bandwidth Harmonic Measurement (Option)
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Index
8.1 Wide Bandwidth Harmonic Measurement
Function
Harmonic measurement up to 50
th
order can be performed on a signal with a 1-kHz
fundamental frequency. Use this mode for harmonic measurement of signals whose
fundamental frequency is higher than the commercial power supply frequency. By
applying an external sampling clock, harmonics can be measured on low frequency
signals with a fundamental frequency of 0.1 Hz. The harmonics of inverters that drive
motors at low frequency (low revolution) can be measured.
• Limitations on the Function and Measurement Function
Wide bandwidth measurement mode performs internal computation differently from
other measurement modes in order to achieve the harmonic measurement of high
frequency signals. Therefore, some functions such as waveform and trend display
on the screen and motor evaluation function (motor version) 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 IEC 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 wide bandwidth 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
• Bar graph display
• Vector display
Chapter 8
Wide Bandwidth Harmonic Measurement (Option)