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National Instruments Corporation
A-1
A
Specifications
This appendix lists the specifications of the NI 4350 and NI 4351. These
specifications are for a 15
to
35
°
C ambient temperature range for one year
unless otherwise specified. All specifications are relative to calibration
standards and require a 30 minute warm-up period. Specifications do not
include transducer errors. Temperature coefficient is applicable for
0
°
C to 15
°
C and 35
°
C to 55
°
C. For thermocouples, add the accessory
error in °C only if the accessory (TC-2190, PSH32-TC6, CB-27T,
TBX-68T, CB-68T) is in the 0
°
C to 15
°
C and 35
°
C to 55
°
C temperature
range.
Accuracy Specifications
Thermocouple Accuracy
1
1
Thermocouple measurement specifications include cold-junction compensation error (with sensor between 15 °C and 35 °C),
isothermal accuracy, and system noise. The specifications assume that the 0.625 V range is used and that ground-referencing
and open-thermocouple detection are enabled for a floating thermocouple. Specifications improve with ground-referencing
enabled and open-thermocouple detection disabled for a floating thermocouple. The specifications also assume that the
cold-junction sensor is between 15 °C and 35 °C.
Error (°C)
15 °C–35 °C, 1 Year
0 °C–15 °C,
35 °C–55 °C
Filter Setting
Temperature
Coefficient
(°C/°C
*
)
Accessory
Error
(°C
**
)
Thermocouple
Type
°C
10 Hz
50 Hz
60 Hz
J
–100
0.53
0.61
0.74
0.02
0.25
0
0.42
0.49
0.59
760
0.42
0.47
0.55
K
–100
0.60
0.72
0.89
0.03
0.27
0
0.45
0.54
0.67
1,000
0.60
0.69
0.81
1,372
0.74
0.84
0.99