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© National Instruments Corporation A-1 NI 4050 User Manual
A
Specifications
This appendix lists the specifications of the NI 4050. These specifications
are guaranteed between 15 and 35 °C unless otherwise specified.
DC Voltage
Accuracy (% of reading ± µV)
Noise Rejection
NMRR (10 Hz reading rate, 50/60 Hz
powerline frequency ±1%)..................... 80 dB
DC ECMRR........................................... 140 dB (with a 1 kΩ imbalance
in LO lead)
AC ECMR (RDC to 60 Hz)...................150 dB (with a 1 kΩ imbalance
in LO lead)
Input Characteristics
Input bias current ...................................1 nA max
Input resistance ......................................> 1 GΩ (2 V, 200 mV,
20 mV ranges);
1MΩ (250 V, 25 V)
Range
24 Hour
(25 °C ± 1 °C)
90 Day
(25 °C ± 10 °C)
1 Year
(25° C ± 10 °C)
Temperature Coefficient
(% of Reading/ °C ± µV/ °C
)
250.000 V 0.0032% ± 4.9 mV 0.021% ± 49 mV 0.024% ± 49 mV 0.0017% ± 4800 µV
25.0000 V 0.0032% ± 4.9 mV 0.021% ± 49 mV 0.024% ± 49 mV 0.0017% ± 4800 µV
2.00000 V 0.0029% ± 37 µV 0.014% ± 260 µV 0.017% ± 260 µV 0.0009% ± 25 µV
200.000 mV 0.0029% ± 27 µV 0.014% ± 250 µV 0.017% ± 250 µV 0.0009% ± 25 µV
20.0000 mV 0.0029% ± 27 µV 0.014% ± 250 µV 0.017% ± 250 µV 0.0009% ± 25 µV
Accuracy numbers are for 5 1/2 digits and include the effects of full-scale and zero-scale errors, temperature variation,
linearity, and noise.