U1271A Datasheet, PDF (11/22 Pages) List of Unclassifed Manufacturers – U1270 Series Handheld Digital Multimeters

Electrical Specifications
Notes for DC specifications (previous page)
1. Notes for voltage specifications:
–– The accuracy of the 30 to 300 mV range is specified after the Null function is used to subtract the thermal effect (by shorting the test leads).
–– For Z_LOW measurements, autoranging is disabled and the multimeter’s range is set to 1000 volts in the manual ranging mode.
2. Notes for resistance specifications:
–– Overload protection: 1000 Vrms for short circuits with < 0.3 A current.
–– Maximum open voltage is < +3.3 V.
–– Built-in buzzer beeps when the resistance measured is less than 25 Ω ± 10 Ω. The multimeter can capture intermittent measurements longer than
1 ms.
–– The accuracy of the 300 Ω to 3 kΩ range is specified after the Null function is used to subtract the test lead resistance and thermal effect (by
shorting the test leads).
–– U1273AX only: The accuracy for all resistance ranges is specified after the Null function is used when measuring at temperatures below –20 °C.
The Null function is used to subtract the test lead resistance and thermal effect (by shorting the test leads).
–– For the ranges of 30 MΩ and 100 MΩ, the RH is specified for < 60%.
–– The accuracy for ranges < 50 nS is specified after the Null function is used on an open test lead.
–– The temperature coefficient of the 100 MΩ and 300 MΩ range is 0.1 × (specified accuracy)/°C (from –40 to 18 °C or 28 to 55 °C).
3. Notes for current specifications:
–– Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse.
–– Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse.
–– Specification for 300 mA range: 440 mA continuous.
–– Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals > 10 to 20 A for 30 seconds
maximum. After measuring currents > 10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
4. Notes for diode specifications:
–– Overload protection: 1000 Vrms for short circuits with < 0.3 A current.
–– Built-in buzzer beeps continuously when the voltage measured is less than 50 mV and beeps once for forward-biased diode or semiconductor
junctions measured between 0.3 V and 0.8 V (0.3 V ≤ reading ≤ 0.8 V).
–– Open voltage for diode: < +3.3 V DC.
–– Open voltage for Auto diode: < +2.5 V DC and > –1.0 V DC.
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