9-10
IM WT3001E-51EN
9.6 IEC Harmonic Measurement Specifications
Item Specifications
Measured source SelectaninputelementoranΣwiringunit
Format PLL synchronization method
Frequency range Fundamental frequency of the PLL source is in the range of 45 Hz to 66 Hz.
PLL source • Select the voltage or current of each input element (external current sensor range is greater than
or equal to 500 mV) or the external clock (fundamental frequency).
• Input level
Greater than or equal to 50% of the measurement range rating when the crest factor is 3
Greater than or equal to 100% of the measurement range rating when the crest factor is 6
• Be sure to turn the frequency filter ON.
Measurement Functions See section 7.11.
FFT data length 9000
FFT processing word length 32 bits
Window function Rectangular
Anti-aliasing filter Set using a line filter (5.5 kHz).
Interharmonic measurement Grouping function Enable (Type 1 or Type 2)/Disable (OFF)
Sample rate (sampling frequency), window width, and upper limit of measured order
Fundamental
Frequency of
the PLL Source
(Hz)
Sample Rate
(S/s)
Window Width against
the FFT Data Length
(Frequency of the
Fundamental Wave)
Upper Limit of
the Measured Order
45 to 55
55 to 66
f×900
f×750
10
12
50
50
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