Datasheet

14 | Keysight | U1240 Series Handheld Digital Multimeters - Data Sheet
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U1240B Series DC Specifications
Function Range Resolution
Test current/
burden voltage
Accuracy ±(% of reading +
counts of least significant digit)
Voltage
1
1000.0 mV 0.1 mV — 0.09% + 5
10.000 V 0.001 V —
0.09% + 2
100.00 V 0.01 V —
1000.0 V 0.1 V — 0.15% + 5
Current
1000.0 μA 0.1 μA < 0.06 V (50 Ω) 0.1% + 3
10000 μA 1 μA < 0.55 V (50 Ω) 0.1% + 3
100.00 mA 0.01 mA < 0.18 V (0.5 Ω) 0.2% + 3
440.0 mA
2
0.1 mA < 0.8 V (0.5 Ω) 0.5% + 3
10.000 A
3
0.001 A < 0.4 V (0.01 Ω) 0.6% + 5
Resistance
4
1000.0 Ω
5
0.1 Ω 0.5 mA
0.3% + 3
10.000 kΩ
5
0.001 kΩ 50 μA
100.00 kΩ 0.01 kΩ 4.91 μA
1000.0 kΩ 0.1 kΩ 447 nA
10.000 MΩ 0.001 MΩ 112 nA 0.8% + 3
100.00 MΩ
6
0.01 MΩ 112 nA 1.5% + 3
Diode test
7
1 V 0.001 V approximately 0.5 mA 0.3% + 2
1. Input impedance: 10 MΩ (nominal).
2. Current can be measured up to 440 mA continuously. An additional 0.2% needs to be added to
the specified accuracy if the signal measured is in the range of 440 mA to 1100 mA for 30 seconds
maximum. After measuring a current of > 440 mA, leave the meter to cool down for twice the
measuring time used before applying a low current measurement.
3. Current can be measured up to 10 A continuously with a maximum operating temperature of 50°C.
An additional 0.3% needs to be added to the specified accuracy if the signal measured is in the range
of 10 A to 19.999 A for 15 seconds maximum. After measuring a current of > 10 A, leave the meter to
cool down for 60 seconds before applying a low current measurement.
4. The maximum open voltage is < 2.8 V. For instant continuity, the built-in buzzer sounds when
resistance is < 10.0 Ω.
5. The accuracy of 1 kΩ and 10 kΩ is specified after Null function, which is used to substrate the test
lead resistance and the thermal effect.
6. For the range of 100 MΩ, the R.H. is specified for < 60%. The temperature coefficient will be 0.15
times of specified accuracy as > 50 MΩ.
7. Overload protection: 1000 V RMS for circuits < 0.3 A short circuit current. The built-in buzzer sounds
when reading is approximately below 50 mV and audible single tone for normal forward biased diode
or semiconductor junction as 0.3 V ≤ Reading ≤ 0.8 V.