Datasheet

15 | Keysight | U1240 Series Handheld Digital Multimeters - Data Sheet
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U1240B Series AC Specifications
Function Range Resolution
Test current/
burden voltage
Accuracy ±(% of reading + counts of least
significant digit)
40 to 500 Hz 500 Hz to 1 kHz 1 to 2 kHz
AC voltage
1, 5
True RMS
1000.0 mV 0.1 mV — 1% + 5 2% + 5 —
10.000 V 0.001 V — 1% + 5 1% + 5 2% + 5
100.00 V 0.01 V — 1% + 5 1% + 5 2% + 5
1000.0 V 0.1 V — 1% + 5 1% + 5 —
AC current
2, 5
True RMS
1000.0 μA 0.1 μA < 0.06 V (50 Ω)
1% + 5 1% + 5 —
10000 μA 1 μA < 0.55 V (50 Ω)
100.00 mA 0.01 mA < 0.18 V (0.5 Ω)
440.0 mA
3
0.1 mA < 0.8 V (0.5 Ω)
10.000 A
4
0.001 A < 0.4 V (0.01 Ω)
1. Input impedance: 10 MΩ (nominal) in parallel with < 100 pF, with overload protection of 1000 V RMS.
2. Crest factor ≤ 3. For non-sinusoidal waveforms with crest factor up to 3, add 2% reading + 2% full
scale typical.
3. Current can be measured from 50 mA 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 application of low current measurement.
4. Current can be measured from 0.5 A 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.
5. AC voltage and AC current specifications are AC coupled. True RMS measurement is valid from 5% of
range to 100% of range.
U1240B Series Temperature Specifications
Thermocouple type Range Resolution
Accuracy ±(% of reading +
offset error)
K (for U1241B and U1242B) –40 to 1000 ºC/–48 to 1832 ºF 0.1°C /0.1°F 1% + 1 ºC/1% + 1.8°F
J (for U1242B only) –40 to 1000 ºC/–48 to 1832 ºF 0.1 ºC/0.1 ºF 1% + 1 ºC/1% + 1.8°F
U1240B Series Capacitance Specifications
Range Resolution
Accuracy ±(% of reading + counts of least
significant digit)
1000.0 nF 0.1 nF
1.2% + 410.000 μF 0.001 μF
100.00 μF 0.01 μF
1000.0 μF 0.1 μF
2% + 4
10.000 mF 0.001 mF
U1240B Series Harmonic Ratio Specifications
Range Frequency Voltage
0.0% to 99.9% 40 to 500 Hz 100 mVAC to 1000 VAC