Appendix A Specifications
© National Instruments Corporation A-5 NI 4050 User Manual
Resistance
Accuracy (% of reading ± Ω)
Measurement mode................................2-wire Ohms
Test current............................................ 100 µA for 200 Ω, 2 kΩ,
20 kΩ ranges
1 µA for 2 MΩ, 200 kΩ ranges
1 µA and 1 MΩ in parallel for
extended Ohms mode
Diode Testing
Accuracy (% of reading ± µV)
Test current............................................ 100 µA
Range 24 Hour
(25 °C ± 1 °C) 90 Day
(25 °C ± 10 °C) 1 Year
(25 °C ± 10 °C) Temperature Coefficient
(% of Reading/°C ± Ω
ΩΩ
Ω/°C)
Extended Ohm
(> 2 MΩ) 0.1% ± 6 kΩ0.1% ± 60 kΩ0.1% ± 60 kΩ0.0072% ± 6 kΩ
2.00000 MΩ0.012% ± 55 Ω0.077% ± 370 Ω0.080% ± 20 Ω0.0072% ± 35 Ω
200.000 kΩ0.012% ± 37 Ω0.077% ± 350 Ω0.080% ± 2 Ω0.0072% ± 35 Ω
20.0000 kΩ0.006% ± 0.5 Ω0.024% ± 4 Ω0.027% ± 4 Ω0.0020% ± 0.40 Ω
2.00000 kΩ0.006% ± 0.4 Ω0.024% ± 4 Ω0.027% ± 4 Ω0.0020% ± 0.40 Ω
200.000 Ω0.006% ± 0.4 Ω0.024% ± 4 Ω0.027% ± 4 Ω0.0020% ± 0.40 Ω
Accuracy numbers are for 5 1/2 digits and include the effects of full-scale and zero-scale errors, temperature variation,
linearity, and noise.
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)
2 V 0.006% ± 60 µV 0.024% ± 400 µV 0.027% ± 400 µV 0.002% ± 40 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.