U2781A Datasheet, PDF (61/76 Pages) Keysight Technologies – USB Modular Products

AC specifications¹
AC accuracy for voltage
Function
Voltage²
Range
100.000 mVrms
1.00000 V
10.0000 V
100.000 V
250.000 V⁴
20 ~ 45
1 + 0.1
1 + 0.1
1 + 0.1
1 + 0.1
1 + 0.1
Accuracy input ±(% of reading + % of range)
Frequency (Hz)
45 ~ 10k
10k ~ 30k
0.2 + 0.1
1.5 + 0.3
0.2 + 0.1
1.0 + 0.1
0.3 + 0.1
1.0 + 0.1
0.3 + 0.1
1.0 + 0.1
0.3 + 0.1
1.0 + 0.1
30k ~ 100k³
5.0 + 0.3
3.0 + 0.2
3.0 + 0.2
3.0 + 0.2
3.0 + 0.2
Temperature coefficient for voltage (0 ºC to 18 ºC, 28 ºC to 55 ºC)
Function
Temperature
coefficient
Range
100.000 mVrms
1.00000 V
10.0000 V
100.000 V
250.000 V
20 ~ 45
0.02 + 0.02
Frequency (Hz)
(% of reading + % of range)
45 ~ 10k
10k ~ 30k
0.02 + 0.02
0.05 + 0.02
30k ~ 100k
0.1 + 0.02
AC accuracy for current¹
Function
Current⁵
Range
10.0000 mA
100.000 mA
1.00000 A
2.00000 A
Burden voltage,
Current shunt
resistance
< 0.2 V, 10 Ω
< 0.2 V, 1 Ω
< 0.3 V, 0.1 Ω
< 0.8 V, 0.1 Ω
Accuracy input ±(% of reading + % of range)
Frequency (Hz)
20 ~ 45
45 ~ 1k
1k ~ 10k
1.5 + 0.1
0.5 + 0.1
2 + 0.2
1.5 + 0.1
0.5 + 0.1
2 + 0.2
1.5 + 0.1
0.5 + 0.1
2 + 0.2
1.5 + 0.1
0.5 + 0.1
2 + 0.2
Temperature coefficient for voltage (0 ºC to 18 ºC, 28 ºC to 55 ºC)
Function
Temperature
coefficient
Range
10.0000 mA
100.000 mA
1.00000 A
2.00000 A
20 ~ 45
Accuracy input ±(% of reading + % of range)
Frequency (Hz)
45 ~ 10k
10k ~ 30k
0.02 + 0.02
0.02 + 0.02
0.02 + 0.02
NOTE To ensure better measurement results and to guard against the change of environment or setup, always
enable the Null offset.
1 _{Specifications are based on 30 minutes warm-up time and calibration temperature within 18 °C to 28 °C. In manual range, the settling time is 2.6}
seconds while in autorange, the first measurement accuracy is < 1%.
2 _{Specifications are for sine wave inputs more than 5% of range. 120% over range on all ranges except 250 VAC. Maximum crest factor of 5 at full scale.}
Input impedance is 1 MΩ in parallel with capacitance less than 120 pF, AC couple with up to 300 VDC.
3 _{Additional error to be added as frequency more than 30 kHz and signal input less than 10% of range. 30 kHz to 100 kHz: add 0.003% of range per kHz.}
4 _{Input signal has to be more than 50 Vrms.}
5 _{Input protected with externally accessible 2 A, 250 V fast blown fuse.}
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