YOKOGAWA WT310

7-5
IM WT310-02EN
Specifications
1
2
3
4
5
6
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.
WT310/WT332/WT333
(Voltage/Current)
WT310HC
(Voltage, Current EXT sensor input)
WT310HC
(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)
0.5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
+ 0.1 % of range)
±(0.1% of reading
+ 0.1 % of range)
±(0.1% of reading
+0.1 % 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 reading+ 0.3 % of
range}
±((0.13×f)% of reading + 0.3 % of
range)
10kHz<
f≤20kHz
±((0.13×f)% of reading + 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.
WT310(5mA/10mA/20mA/50mA/100mA/200mAranges):5μA/°C
WT310(0.5A/1A/2A/5A/10A/20Aranges)andWT332/WT333directcurrentinput:500μA/°C
WT310HC 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 waveform display data, Upk and Ipk
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)
Voltageinput:1.5×√(15/range)%ofrange
Direct current input range:
WT310(5mA/10mA/20mA/50mA/100mA/200mArange):3×√(0.005/range)%ofrange
WT310(0.5A/1A/2A/5A/10A/20Arange)andWT332/WT333directcurrentinput:3×√(0.5/
range) % of range
WT310HC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