YOKOGAWA WT3002E, Руководство пользователя

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8-6
IM WT3001E-51EN
8.5 Wide Bandwidth Harmonic Measurement
Specifications
Item Specifications
Measured source All installed elements
Format 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)
Frequency range • 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%.
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 (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.
Measurement Functions See section 7.11.
FFT data length 9000
FFT processing word 32 bits
Window function Rectangular
Anti-aliasing filter Set using a line filter (OFF, 500 Hz, 5.5 kHz, or 50 kHz).
Sample rate (sampling frequency), window width, and upper limit of measured order
PLL source synchronization method
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
10 to 20
20 to 40
40 to 55
55 to 75
75 to 150
150 to 440
440 to 1100
1100 to 2600 f × 3000
f × 1500
f × 900
f × 750
f × 450
f × 360
f × 150
f × 60 3
6
10
12
20
25
60
150 100
100
100
100
62
62
62
20
External sampling clock method
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
0.1 to 66 f × 3000 3 100
Accuracy • When the line filter (500 Hz) is ON
Frequency Voltage and Current
±(reading error + measurement
range error)
Power
±(reading error + measurement
range error)
0.1 Hz ≤ f < 10 Hz
10 Hz ≤ f < 30 Hz
30 Hz ≤ f ≤ 66 Hz 0.7% of r 0.3% of range
0.7% of r 0.3% of range
0.7% of r 0.05% of range 1.4% of r 0.4% of range
1.4% of r 0.4% of range
1.4% of r 0.1% of range