Appendix A Specifications
© National Instruments Corporation A-3 NI 4050 User Manual
AC Voltage
Accuracy (% of reading ± mV)
Noise Rejection
AC CMRR (DC to 60 Hz)......................> 80 dB (with a 1 kΩ imbalance
in LO lead)
Input Characteristics
Input resistance...................................... 1 MΩ all ranges
Bandwidth..............................................20 Hz–25 kHz
Additional AC Errors
Frequency-dependent errors
Range 24 Hour
(25 °C ± 1 °C) 90 Day
(25 °C ± 10 °C) 1 Year
(25 °C ± 10 °C) Temperature Coefficient
(% of Reading/°C ± mV/°C)
250.000 V 0.6% ± 500 mV 0.62% ± 680 mV 0.62% ± 680 mV 0.007% ± 20 mV
25.0000 V 0.3% ± 30 mV 0.32% ± 210 mV 0.32% ± 210 mV 0.007% ± 20 mV
2.00000 V 0.4% ± 3 mV 0.42% ± 21 mV 0.42% ± 21 mV 0.019% ± 2 mV
200.000 mV 0.3% ± 0.22 mV 0.32% ± 1.20 mV 0.32% ± 1.20 mV 0.007% ± 0.110 mV
20.0000 mV 0.4% ± 100 µV 0.42% ± 170 µV 0.42% ± 170 µV 0.019% ± 12 µV
Accuracy numbers are for 5 1/2 digits and include the effects of full-scale and zero-scale errors, temperature variation,
linerarity, and noise, applies for sine waves ≥ 10% of input range. Accuracy may be affected by source impedance, cable
capacitances dielectric absorption, or slew rate.
Input Frequency Additional Error (% of Reading)
20–50 Hz 2.5%
50–100 Hz 1%
100 Hz–5 kHz 0%
5–10 kHz 1%
10–25 kHz 2.5%