National Instruments NI 435 Series, User Manual, Page: 49 / 77

© National Instruments Corporation A-1 NI 435x User Manual
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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