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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 M
Ω)
0.1% ± 6 k
Ω
0.1% ± 60 k
Ω
0.1% ± 60 k
Ω
0.0072% ± 6 k
Ω
2.00000 M
Ω
0.012% ± 55
Ω
0.077% ± 370
Ω
0.080% ± 20
Ω
0.0072% ± 35
Ω
200.000 k
Ω
0.012% ± 37
Ω
0.077% ± 350
Ω
0.080% ± 2
Ω
0.0072% ± 35
Ω
20.0000 k
Ω
0.006% ± 0.5
Ω
0.024% ± 4
Ω
0.027% ± 4
Ω
0.0020% ± 0.40
Ω
2.00000 k
Ω
0.006% ± 0.4
Ω
0.024% ± 4
Ω
0.027% ± 4
Ω
0.0020% ± 0.40
Ω
200.000
Ω
0.006% ± 0.4
Ω
0.024% ± 4
Ω
0.027% ± 4
Ω
0.0020% ± 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.