Datasheet

Input Specications
The accuracy is given as ± (% of reading + counts of least signicant digit (LSD)) at 23 °C ± 5 °C, with relative humidity less than 80%
R.H. and after a warm-up period of at least ve minutes. Without warm-up, an additional ve counts of LSD need to be considered.
Voltage specications
Function Range Resolution Accuracy Overload protection
DC voltage
1
50 mV 1 µV 0.05% + 50
2
250 Vrms
500 mV 10 µV
0.03% + 5
5 V 0.1 mV
50 V 1 mV
250 V 10 mV
AC voltage
3
(True-rms: From 5% to 100% of range)
50 mV 1 µV 45 Hz to 5 kHz: 0.7% + 40
5 kHz to 20 kHz: 1.5% + 40
500 mV 10 µV
45 Hz to 5 kHz: 0.7% + 20
5 kHz to 20 kHz: 1.5% + 20
5 V 0.1 mV
50 V 1 mV
250 V 10 mV
AC+DC voltage
3
(True-rms: From 5% to 100% of range)
50 mV 1 µV 45 Hz to 5 kHz: 0.8% + 70
5 kHz to 20 kHz: 1.6% + 70
500 mV 10 µV
45 Hz to 5 kHz: 0.8% + 25
5 kHz to 20 kHz: 1.6% + 25
5 V 0.1 mV
50 V 1 mV
250 V 10 mV
1. Input impedance: 10 MΩ (nominal) for the range of 5 V and above, and 1 GΩ (nominal) for the 50/500 mV range.
2. Accuracy can be improved to 0.05% + 5. Always use the Relative function to offset thermal effects before measuring the signal.
3. Input impedance: 1.1 MΩ in parallel with < 100 pF (nominal) for the range of 5 V and above, and 1 GΩ (nominal) for the 50/500 mV range.
Crest factor ≤ 3.
Current specications
Function Range Resolution Accuracy
Burden
voltage/shunt Overload protection
DC current 50 mA 1 µA 0.03% + 5
1
0.06 V (1 Ω)
250 V, 630 mA
Quick acting fuse
500 mA 10 µA 0.03% + 5
1
0.6 V (1 Ω)
AC current
2
(True-rms: From 5% to 100% of range)
50 mA 1 µA 45 Hz to 5 kHz: 0.6% + 20 0.06 V (1 Ω)
500 mA 10 µA 45 Hz to 5 kHz: 0.6% + 20 0.6 V (1 Ω)
AC+DC current
2
(True-rms: From 5% to 100% of range)
50 mA 1 µA 45 Hz to 5 kHz: 0.7% + 25 0.06 V (1 Ω)
500 mA 10 µA 45 Hz to 5 kHz: 0.7% + 25 0.6 V (1 Ω)
1. Always use the Relative function to offset thermal effects before measuring the signal. If this function is not used, accuracy could go down to 0.03% + 25.
Thermal effects may be present due to:
– Constant current, constant voltage, or square wave output.
– Wrong operation. For example, resistance, diode, or mV measurement function is used to measure high voltage signals exceeding 250 V.
– After battery charging has completed.
– After measuring current greater than 50 mA.
2. Crest factor ≤ 3.
04 | Keysight | U1401B Handheld Multi-function Calibrator/Meter - Data Sheet