LIMIT 400 - AC Current Measurement; Resistance Test; Frequency Measurement

D. AC current
Range Resolution
Accuracy
Overload protection
UT39A UT39B UT39C
200µA 0.1µA ±(1%+3)
0.315A. 250V
fast type fuse,
ø5x20mm
2mA 1µA ±(1%+3)
20mA 10µA ±(1%+3)
200mA 100µA ±(1.8%+3)
10A/20A 10mA ±(3%+5) Un-fused
Remark:
• UT39A/UT39B-At 10A range: For continuous measurement ≤ 10 seconds and interval not less than 15
minutes.
• UT39C-At 20A range: For continuous measurement ≤ 10 seconds and interval not less than 15 minutes.
• Measurement voltage drop: Full range at 200mV.
• Frequency reaponse: 40Hz ~ 400Hz.
• Display effective value of sine wave (mean value response).
E. Resistance test
Range Resolution
Accuracy
Overload protection
UT39A UT39B UT39C
200Ω 0.1Ω ±(0.8%+3)
250V DC
or AC rms
2kΩ 1Ω
±(0.8%+1)
±(0.8%+1)
20kΩ 10Ω
200kΩ 100Ω
2MΩ 1kΩ ±(0.8%+1)
20MΩ 10kΩ ±(1%+2)
200MΩ 100kΩ ±[5%(reading-10)+10]
Remark:
• Open circuit voltage:
At 200MΩ range: approx. 3V
Other ranges: ≤ 700mV
• At 200MΩ range, test lead is in short circuit, and it is normal to display 10 digits. During measurement,
subtract the 10 digits from the reading.
F. The mode UT39C: Frequency
Range Resolution Accuracy Overload protection
2kHz 1Hz ±(2%+5)
250V AC
20kHz 10Hz ±(1.5%+5)
Remark:
• Input sensitivity: ≤ 200mV.
• When the input voltage is ≥ 30V rms, no guaranteed accuracy.
Illustrations