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U1281A Datasheet, PDF (10/18 Pages) Keysight Technologies – U1280 Series Handheld Digital Multimeters
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10 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet
AC and AC + DC voltage specification for U1281A / U1282A1,2
Function
AC voltage
True RMS
AC + DC voltage
True RMS
Range
60 mV
600 mV3
6V
60 V
600 V
1000 V
LPF (Low Pass
Filter) enabled,
applicable for all
voltage ranges
and resolutions
60 mV
600 mV3
6V
60 V
600 V
1000 V
Resolution
0.001 mV
0.01 mV
0.0001 V
0.001 V
0.01 V
0.1 V
0.001 mV
0.01 mV
0.0001 V
0.001 V
0.01 V
0.1 V
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
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 60
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 60
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 60
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 60
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 604
1.0 % + 60 0.3 % + 25
0.7 % + 25
1.5 % + 604
2.0 % + 60 2.0 % + 25 for < 200 Hz N/A
N/A
6.0 % + 60 for < 440 Hz
1.05 % +
70
1.05 % +
65
1.05 % +
65
1.05 % +
65
1.05 % +
65
1.05 % +
65
0.35 % + 35
0.35 % + 30
0.35 % + 30
0.35 % + 30
0.35 % + 30
0.35 % + 30
0.75 % + 35
0.75 % + 30
0.75 % + 30
0.75 % + 30
0.75 % + 30
0.75 % + 30
1.55 % + 70
1.55 % + 65
1.55 % + 65
1.55 % + 65
1.55 % + 654
1.55 % + 654
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
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
The bandwidth for U1281A is up to30 kHz only.
20 kHz to 100 kHz5
3.5 % + 60
3.5 % + 60
3.5 % + 60
3.5 % + 60
3.5 % + 604
N/A
N/A
3.55 % + 70
3.55 % + 65
3.55 % + 65
3.55 % + 65
3.55 % + 654
N/A
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