Datasheet
11 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet
AC and AC + DC voltage specification for U1281A / U1282A
1,2
Function Range Resolution Accuracy ± (% of reading + counts of least significant digit)
20 Hz to
45 Hz
45 Hz to 1 kHz 1 kHz to 10
kHz
10 kHz to 20 kHz 20 kHz to 100 kHz
5
AC voltage
True RMS
60 mV 0.001 mV 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60 3.5 % + 60
600 mV
3
0.01 mV 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60 3.5 % + 60
6 V 0.0001 V 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60 3.5 % + 60
60 V 0.001 V 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60 3.5 % + 60
600 V 0.01 V 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60
4
3.5 % + 60
4
1000 V 0.1 V 1.0 % + 60 0.3 % + 25 0.7 % + 25 1.5 % + 60
4
N/A
LPF (Low Pass
Filter) enabled,
applicable for all
voltage ranges
and resolutions
2.0 % + 60 2.0 % + 25 for < 200 Hz
6.0 % + 60 for < 440 Hz
N/A N/A N/A
AC + DC voltage
True RMS
60 mV 0.001 mV 1.05 % +
70
0.35 % + 35 0.75 % + 35 1.55 % + 70 3.55 % + 70
600 mV
3
0.01 mV 1.05 % +
65
0.35 % + 30 0.75 % + 30 1.55 % + 65 3.55 % + 65
6 V 0.0001 V 1.05 % +
65
0.35 % + 30 0.75 % + 30 1.55 % + 65 3.55 % + 65
60 V 0.001 V 1.05 % +
65
0.35 % + 30 0.75 % + 30 1.55 % + 65 3.55 % + 65
600 V 0.01 V 1.05 % +
65
0.35 % + 30 0.75 % + 30 1.55 % + 65
4
3.55 % + 65
4
1000 V 0.1 V 1.05 % +
65
0.35 % + 30 0.75 % + 30 1.55 % + 65
4
N/A
Notes
1. Overload protection: 1000 Vrms. Overload protection for mV range: 1000 Vrms for short circuits with
< 0.3 A current.
2. Input impedance: 10 MΩ in parallel with < 100 pF (nominal). The accuracy is specified for 10 MΩ
(nominal) input impedance.
3. Add additional 2 % error as crest factor > 2
4. For voltage that is lower than 300 Vrms, and frequency lower than 30 kHz.
5. 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
The bandwidth for U1281A is up to30 kHz only.