7-5
IM WT310E-02EN
Specifications
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3
4
5
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7
App
Index
7.3 Accuracy
7.3.1 Voltage and Current Accuracy
Item
Specifications
Accuracy
Requirements
• Temperature: 23 ± 5°C
• Humidity: 30 to 75%RH
• Input waveform: Sine wave
• Crest factor: 3
• Common-mode voltage: 0 V
• Scaling function: OFF
• Number of displayed digits: 5 digits
• Frequency filter: Turn ON to measure voltage or current of 200 Hz or less.
• After warm-up time has passed
• After zero-level compensation or after measurement range is changed
Accuracy (at 12 months)
(The accuracy shown below is the sum of reading and range errors.)
* f in the read error equation is the input signal frequency in kHz.
WT310E/WT332E/WT333E
(Voltage/Current)
WT310EH
(Voltage, Current EXT sensor input)
WT310EH
(Direct current input)
DC
±(0.1% of reading
+ 0.2% of range)
±(0.1% of reading
+ 0.2% of range)
±(0.2% of reading
+ 0.2% of range)
0.1 Hz ≤ f< 45 Hz
±(0.1% of reading
+ 0.2% of range)
±(0.1% of reading
+ 0.2% of range)
±(0.1% of reading
+ 0.2% of range)
45 Hz ≤ f ≤ 66 Hz
±(0.1% of reading
+ 0.05 % of range)
±(0.1% of reading
+ 0.05 % of range)
±(0.1% of reading
+ 0.05 % of range)
66 Hz < f ≤ 1 kHz
±(0.1% of reading
+ 0.2 % of range)
±(0.1% of reading
+ 0.2 % of range)
±(0.1% of reading
+ 0.2 % of range)
1 kHz < f ≤ 10 kHz
±{(0.07×f)% of reading
+ 0.3 % of range}
±{(0.07×f)% of 0.3 % of
range}
±{(0.13×f)% of 0.3 % of
range}
10 kHz < f ≤ 20 kHz
±{(0.13×f)% of r 0.5 % of
range}
10 kHz < f ≤ 100 kHz
±(0.5 % of reading
+0.5 % of range)
±[{0.04×(f–10)}% of reading]
±(0.5 % of reading
+ 0.5 % of range)
±[{0.04×(f–10)}% of reading]
• Influence of temperature changes after zero-level compensation or range change
Add 0.02% of range/°C to the DC voltage accuracy.
Add the following value to the DC current accuracies.
WT310E (5mA/10mA/20mA/50mA/100mA/200mA ranges): 5 μA/°C
WT310E (0.5A/1A/2A/5A/10A/20A ranges) and WT332E/WT333E direct current input: 500 μA/°C
WT310EH direct current input: 1 mA/°C
External current sensor input (/EX1): 1 mV/°C
External current sensor input (/EX2): 50 μV/°C
• Accuracy of the Upk, Ipk and waveform display data
Add the following value to the above accuracy (reference value).
The effective input range is within ±300% of range (within ±600% for crest factor 6 or 6A)
Voltage input: 1.5 × √(15/range) % of range
Direct current input range:
WT310E (5mA/10mA/20mA/50mA/100mA/200mA range): 3 ×√(0.005/range) % of range
WT310E (0.5A/1A/2A/5A/10A/20A range) and WT332E/WT333E direct current input: 3
×√(0.5/range) % of range
WT310EH direct current input: 3 ×√(1/range) % of range
External current sensor input range:
/EX1 Option: 3 ×√(2.5/range) % of range
/EX2 Option: 3 ×√(0.05/range) % of range
