YOKOGAWA WT200 User Manual page 233

16.2 Measurement Functions
Effective Power
Item
Method
Frequency range
Display accuracy
(within 3 months after
calibration)
(Conditions)
Temperature: 23 ±5°C
Humidity: 30% to 75%
R.H.
Supply voltage:
Specified Voltage ±5%
Input waveform: Sine wave
Common mode voltage:
0 VDC
Filter: ON at 200 Hz or less
Scaling: OFF
This accuracy are
guaranteed by YOKOGAWA
calibration system.
Note: The unit f in accuracy expressions is kHz.
Effect of power factor
Note: The ϕ is the phase angle between the voltage and current, and the f is frequency.
Effective input range
Accuracy (within 12 months The above specified reading accuracy increased 0.5 times is added to the accuracy (within 3
after calibration)
Temperature coefficient
Display update rate
16-4
Specification
Digital sampling method, summation averaging method
DC, 10 Hz to 50 kHz
±(0.3% of rdg + 0.3% of rng)
DC :
10 Hz ≤ f < 45 Hz : ±(0.5% of rdg + 0.3% of rng)
45 Hz ≤ f ≤ 66 Hz : ±(0.2% of rdg + 0.1% of rng)
66Hz < f ≤ 1 kHz : ±(0.5% of rdg + 0.3% of rng)
1 kHz < f ≤ 10 kHz : ±(0.3% of rdg + 0.5% of rng)±{(0.08 × f)% of rdg}
10 kHz < f ≤ 20 kHz : ±(0.8% of rdg + 0.8% of rng)±[{0.19 × (f–10)}% of rdg]
Reference value
20 kHz < f ≤ 50 kHz : ±(0.8% of rdg + 0.8 % of rng)±[{0.25 × (f–10)}% of rdg]
cosϕ = 0
45 Hz ≤ f ≤ 66 Hz:add ±0.25% of range
Reference data (up to 50 kHz): add ±{(0.23 + 0.4 × f kHz)% of range}
1 > cosϕ > 0
add the product of tanϕ and the effect on cosϕ = 0.
With the input range at 10% to 110%, the above specified accuracy is valid. With the input range at
110% to 130%, the above specified reading accuracy increased 0.5 times is added to the accuracy.
months after calibration).
±0.03% of range/°C at 5 to 18°C, 28 to 40°C
4 times/s
IM 253421-01E