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© National Instruments Corporation 15 USB-9211/9211A User Guide and Specifications
Cold-junction compensation sensor accuracy
0 to 60 °C........................................0.6 °C (1.1 °F) typ,
1.3 °C (2.3 °F) max
Conversion time.....................................70 ms per channel;
420 ms total for all channels
including the autozero and
cold-junction channels
Max sampling rate (Hz)
Input bandwidth (–3 dB)........................ 15 Hz
Noise rejection ....................................... 85 dB min at 50/60 Hz
Overvoltage protection........................... ±30 V between any input and
common
Differential input impedance ................. 20 MΩ
Input current........................................... 50 nA
Input noise.............................................. 1 µV
rms
Gain error ............................................... 0.05% max at 25 °C,
0.06% typ (over temperature)
0.1% max (over temperature)
Offset error (with autozeroing) .............. 15 µV typ, 20 µV max
Gain error from source impedance......... 0.05 ppm per Ω source impedance
due to input impedance
Number of
Channels in
Scan List
Type of Measurement
Tempertaure
with CJC and
Autozero
Temperature
with Autozero
RAW
Analog
Input
1 4 6 12
2 3 4 6
3 2.4 3 4
4 2 2.4 3
Note: DAQmx Base always applies autozero.