U1281A Datasheet, PDF (11/18 Pages) Keysight Technologies – U1280 Series Handheld Digital Multimeters

11 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet
AC and AC + DC current specification for U1281A / U1282A^8,9
Function
Range
AC current
True RMS
AC + DC current
True RMS
600 µA¹
6 mA
60 mA
600 mA²
6A
10 A³
600 µA¹
6 mA
60 mA
600 mA²
6A
10 A³
Resolution
0.01 µA
0.0001 mA
0.001 mA
0.01 mA
0.0001 A
0.001 A
0.01 µA
0.0001 mA
0.001 mA
0.01 mA
0.0001 A
0.001 A
Accuracy ± (% of reading + counts of least significant digit)
20 Hz to 45 Hz
45 Hz to 1 kHz
1 kHz to 20 kHz⁵
1.0 % + 40
0.6 % + 25
1.0 % + 30
1.0 % + 40
0.6 % + 25
1.0 % + 30
1.0 % + 40
0.6 % + 25
1.0 % + 30
1.0 % + 40
0.6 % + 25
1.5 % + 30
1.0 % + 40⁴
0.6 % + 25
1.5% + 30⁶
1.0 % + 40⁴
0.6 % + 25
1.5% + 30⁶
1.12 % + 50
0.72 % + 35
1.12 % + 40
1.05 % + 45
0.65 % + 30
1.05 % + 35
1.10 % + 60
0.70 % + 45
1.05 % + 50
1.15 % + 45
0.75 % + 30
1.65 % + 35
1.15 % + 50⁴
0.95 % + 35
1.65 % + 40⁶
1.15 % + 45⁴
0.95 % + 30
1.65 % + 40⁶
20 kHz to 100 kHz^5,6,7
5 % + 40
5 % + 40
5 % + 40
5 % + 40
N/A
N/A
5.12 % + 50
5.05 % + 45
5.10 % + 60
5.15 % + 45
N/A
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
30 kHz
50 kHz
100 kHz
Counts of least
significant digit
0.1
0.1
0.1
Formula
0.1 x 30 x 30
0.1 x 50 x 50
0.1 x 100 x 100
Additional error
90
250
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.