11 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet

Function

Range

Resolution

Accuracy ± (% of reading + counts of least significant digit)

20 Hz to 45 Hz

45 Hz to 1 kHz

AC current

True RMS

0.01 µA

1.0 % + 40

0.6 % + 25

1.0 % + 30

5 % + 40

6 mA

0.0001 mA

1.0 % + 40

0.6 % + 25

1.0 % + 30

5 % + 40

60 mA

0.001 mA

1.0 % + 40

0.6 % + 25

1.0 % + 30

5 % + 40

0.01 mA

1.0 % + 40

0.6 % + 25

1.5 % + 30

5 % + 40

6 A

0.0001 A

0.6 % + 25

N/A

0.001 A

0.6 % + 25

N/A

AC + DC current

True RMS

0.01 µA

1.12 % + 50

0.72 % + 35

1.12 % + 40

5.12 % + 50

6 mA

0.0001 mA

1.05 % + 45

0.65 % + 30

1.05 % + 35

5.05 % + 45

60 mA

0.001 mA

1.10 % + 60

0.70 % + 45

1.05 % + 50

5.10 % + 60

0.01 mA

1.15 % + 45

0.75 % + 30

1.65 % + 35

5.15 % + 45

6 A

0.0001 A

0.95 % + 35

N/A

0.001 A

0.95 % + 30

N/A

Notes

1. Typical performance for current ≤ 30 µArms.

2. Current can be measured up to 440 mA continuously. Maximum of 20 hours for measuring current

more than 440 mA.

3. Current can be measured up to 10 A continuously. Maximum of 30 seconds for measuring current

more than 10 A to 20 A, add 0.3 % to specified accuracy. The multimeter needs to be cool down

after measuring current that is more than 10 A. Cool down the meter for twice the duration of the

measured time and use NULL function to zero-out thermal effect before proceeding with lower

current measurement.

4. Input current < 3 Arms.

5. These specifications are for typical performance.

6. For current < 3 Arms and < 5 kHz.

7. Additional error when Frequency is more than 30 kHz: 0.1 of least significant digit x square of

frequency. The bandwidth of U1281A is up to 30 kHz only.

Frequency

Counts of least

significant digit

Formula

Additional error

30 kHz

0.1

0.1 x 30 x 30

90

50 kHz

0.1

0.1 x 50 x 50

250

100 kHz

0.1

0.1 x 100 x 100

1000

8. 6 A and 10 A ranges (connection with A terminal) overload protection by 10 x 38 mm, 11 A / 1000 V,

20 kA minimum fast-acting fuse. 600 µA to 600 mA ranges (connection wth µ.mA terminal) overload

protection by 10 x 35 mm, 440 mA / 1000 V, 10 kA minimum fast-acting fuse.

9. Ensure good ventilation and no heat element close to the meter.