9-10
IM WT3001E-51EN
9.6 IEC Harmonic Measurement Specifications
Item
Specifications
Measured source
Select an input element or an Σ wiring unit
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
