YOKOGAWA wt3000, User Manual, Page: 324 / 384

12-10
IM 760301-01E
12.5 Functions
Item Specifications
Measurement mode Select from the following measurement modes.
•
Normal measurement mode
• Wide bandwidth harmonic measurement mode*
1
• IEC harmonic measurement mode*
1
• Waveform computation mode*
1
• FFT mode*
1
• Voltage fluctuation and flicker measurement mode*
2
• Cycle-by-cycle measurement mode*
3
*1 Selectable on models with the advanced computation option.
*2 Selectable on models with the voltage fluctuation and flicker measurement option.
*3 Selectable on models with the cycle-by-cycle measurement option.
Frequency Measurement
Item Specifications
Measured item Select up to two of the frequencies of the voltage or current that is input to the input element. For
models with the frequency measurement add-on option, the frequencies of all voltages and currents
applied to the input element are measured.
Measurement method Reciprocal method
Measurement range
Data update rate Measurement range
50 ms 45 Hz ≤ f ≤ 1MHz
100 ms 25 Hz ≤ f ≤ 1 MHz
250 ms 10 Hz ≤ f ≤ 500 kHz
500 ms 5 Hz ≤ f ≤ 200 kHz
1 s 2.5 Hz ≤ f ≤ 100 kHz
2 s 1.5 Hz ≤ f ≤ 50 kHz
5 s 0.5 Hz ≤ f ≤ 20 kHz
10 s 0.25 Hz ≤ f ≤ 10 kHz
20 s 0.15 Hz ≤ f ≤ 5 kHz
Accuracy
±
0.05% of reading
When the input signal level is greater than or equal to 25 mV (current sensor input), 150 mA (direct
current input to the 30-A input element), or 1.5 mA (direct current input to the 2-A input element) and
the signal is greater than or equal to 30% (0.1 Hz to 440 Hz, with frequency filter ON), 10% (440 Hz
to 500 kHz), or 30% (500 kHz to 1 MHz) of the measurement range. Except, input greater than or
equal to 50% of the measurement range when the frequency is less than or equal twice the lower
limit of frequency described above. Add 0.05% of reading when the external current sensor input is
50 mV or less. Twice these values for the input signal level when the crest factor is set to 6
Display resolution 99999
Frequency measurement Frequency filter (see section 12.1)
filter
Integration
Item Specifications
Mode Select from manual, normal, repetitive, real-time normal, and real-time repetitive.
Measurement function See section 12.3.
Integration timer Automatic stop of integration by setting a timer.
0000h00m00s to 10000h00m00s
Count overflow When the integration time reaches its maximum (10000 hours) or the integration value reaches its
maximum or minimum,*
1
the integration time and integration value at that point are held and the
integration is stopped.
*1 WP: ± 999999 MWh
q: ± 999999 MAh
WS: ± 999999 MVAh
WQ: ± 999999 Mvarh