Table of Contents
Advertisement
9.6
IEC Harmonic Measurement Specifications
Item
Measured source
Format
Frequency range
PLL source
Measurement Functions
FFT data length
FFT processing word length 32 bits
Window function
Anti-aliasing filter
Interharmonic measurement Grouping function Enable (Type 1 or Type 2)/Disable (OFF)
Sample rate (sampling frequency), window width, and upper limit of measured order
9-10
Specifications
Select an input element or an Σ wiring unit
PLL synchronization method
Fundamental frequency of the PLL source is in the range of 45 Hz to 66 Hz.
• 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.
See section 7.11.
9000
Rectangular
Set using a line filter (5.5 kHz).
Fundamental
Sample Rate
Frequency of
(S/s)
the PLL Source
(Hz)
45 to 55
f × 900
55 to 66
f × 750
Window Width against
the FFT Data Length
(Frequency of the
Fundamental Wave)
10
12
Upper Limit of
the Measured Order
50
50
IM WT3001E-51EN
Advertisement
Table of Contents
