U1401B Datasheet, PDF (4/10 Pages) Keysight Technologies – Multi-function Calibrator/Meter

04 | Keysight | U1401B Handheld Multi-function Calibrator/Meter - Data Sheet
Input Speciications
The accuracy is given as ± (% of reading + counts of least signiicant digit (LSD)) at 23 °C ± 5 °C, with relative humidity less than 80%
R.H. and after a warm-up period of at least ive minutes. Without warm-up, an additional ive counts of LSD need to be considered.
Voltage speciications
Function
DC voltage¹
AC voltage³
(True-rms: From 5% to 100% of range)
AC+DC voltage³
(True-rms: From 5% to 100% of range)
Range
50 mV
500 mV
5V
50 V
250 V
50 mV
500 mV
5V
50 V
250 V
50 mV
500 mV
5V
50 V
250 V
Resolution
1 µV
10 µV
0.1 mV
1 mV
10 mV
1 µV
10 µV
0.1 mV
1 mV
10 mV
1 µV
10 µV
0.1 mV
1 mV
10 mV
Accuracy
0.05% + 50²
Overload protection
0.03% + 5
45 Hz to 5 kHz: 0.7% + 40
5 kHz to 20 kHz: 1.5% + 40
45 Hz to 5 kHz: 0.7% + 20
5 kHz to 20 kHz: 1.5% + 20
45 Hz to 5 kHz: 0.8% + 70
5 kHz to 20 kHz: 1.6% + 70
45 Hz to 5 kHz: 0.8% + 25
5 kHz to 20 kHz: 1.6% + 25
250 Vrms
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 speciications
Function
DC current
AC current²
(True-rms: From 5% to 100% of range)
AC+DC current²
(True-rms: From 5% to 100% of range)
Range
50 mA
500 mA
50 mA
500 mA
50 mA
500 mA
Resolution
1 µA
10 µA
1 µA
10 µA
1 µA
10 µA
Accuracy
0.03% + 5¹
0.03% + 5¹
45 Hz to 5 kHz: 0.6% + 20
45 Hz to 5 kHz: 0.6% + 20
45 Hz to 5 kHz: 0.7% + 25
45 Hz to 5 kHz: 0.7% + 25
Burden
voltage/shunt
0.06 V (1 Ω)
0.6 V (1 Ω)
0.06 V (1 Ω)
0.6 V (1 Ω)
0.06 V (1 Ω)
0.6 V (1 Ω)
Overload protection
250 V, 630 mA
Quick acting fuse
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.