Table of Contents
Advertisement
8.5
Wide Bandwidth Harmonic Measurement
Specifications
Item
Measured source
Format
Frequency range
PLL source
Measurement Functions
FFT data length
FFT processing word
Window function
Anti-aliasing filter
Sample rate (sampling frequency), window width, and upper limit of measured order
Accuracy
8-6
Specifications
All installed elements
PLL synchronization method (when the PLL source is not set to Smp Clk) or external sampling
clock method (when the PLL source is set to Smp Clk)
• PLL synchronization method
Fundamental frequency of the PLL source is in the range of 10 Hz to 2.6 kHz.
• External sampling clock method
Input a sampling clock signal having a frequency that is 3000 times the fundamental frequency
between 0.1 Hz and 66 Hz of the waveform on which to perform harmonic measurement. The
input level is TTL. The input waveform is a rectangular wave with a duty ratio of 50%.
• 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 (Ext Clk or Smp Clk).
• 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
• Turn the frequency filter ON when the fundamental frequency is less than or equal to 440 Hz.
See section 7.11.
9000
32 bits
Rectangular
Set using a line filter (OFF, 500 Hz, 5.5 kHz, or 50 kHz).
PLL source synchronization method
Fundamental
Sample Rate
Frequency of
(S/s)
the PLL Source
(Hz)
10 to 20
f × 3000
20 to 40
f × 1500
40 to 55
f × 900
55 to 75
f × 750
75 to 150
f × 450
150 to 440
f × 360
440 to 1100
f × 150
1100 to 2600
f × 60
External sampling clock method
Fundamental
Sample Rate
Frequency of
(S/s)
the PLL Source
(Hz)
0.1 to 66
f × 3000
• When the line filter (500 Hz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
0.1 Hz ≤ f < 10 Hz
0.7% of reading + 0.3% of range
10 Hz ≤ f < 30 Hz
0.7% of reading + 0.3% of range
30 Hz ≤ f ≤ 66 Hz
0.7% of reading + 0.05% of range
Window Width against
the FFT Data Length
(Frequency of the
Fundamental Wave)
3
6
10
12
20
25
60
150
Window Width against
the FFT Data Length
(Frequency of the
Fundamental Wave)
3
Power
±(reading error + measurement
range error)
1.4% of reading + 0.4% of range
1.4% of reading + 0.4% of range
1.4% of reading + 0.1% of range
Upper Limit of
the Measured Order
100
100
100
100
62
62
62
20
Upper Limit of
the Measured Order
100
IM WT3001E-51EN
Advertisement
Table of Contents
