©
National Instruments Corporation
17
NI USB-9213 User Guide and Specifications
Input noise
High-resolution mode ..................... 200 nV
rms
High-speed mode ............................ 7
μ
V
rms
Gain error
High-resolution mode ..................... 0.03% typ at 25 °C,
0.07% typ at 0 to 60 °C,
0.15% max at 0 to 60 °C
High-speed mode ............................ 0.04% typ at 25 °C,
0.08% typ at 0 to 60 °C,
0.16% max at 0 to 60 °C
Offset error
High-resolution mode ..................... 4
μ
V typ, 6
μ
V max
High-speed mode ............................ 14
μ
V typ, 17
μ
V max
Offset error
from source impedance .......................... Add 0.05
μ
V per
Ω
, when source
impedance >50 W
Cold-junction compensation accuracy
0 to 60 °C ........................................ 0.8 °C typ, 1.7 °C max
Temperature Measurement Accuracy
Measurement sensitivity
1
High-resolution mode
Types J, K, T, E, N .................. <0.02 °C
Types B, R, S ........................... <0.15 °C
High-speed mode
Types J, K, T, E ....................... <0.25 °C
Type N ..................................... <0.35 °C
Type B ..................................... <1.2 °C
Types R, S................................ <2.8 °C
1
Measurement sensitivity represents the smallest change in temperature that a sensor can detect. It is a function of noise. The
values assume the full measurement range of the standard thermocouple sensor according to ASTM E230-87.
