©
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 M
Ω
Input current ........................................... 50 nA
Input noise.............................................. 1
µ
V
rms
Gain error ............................................... 0.05% max at 25 °C,
0.06% typ (over temperature)
0.1% max (over temperature)
Offset error (with autozeroing) .............. 15
µ
V typ, 20
µ
V 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.
