Spectrum Controls 1746sc-NI8u - Manual (Page 88)

76 SLC 500 ™ Universal Analog Input Module
The accuracies specified as follows include errors due to the cold junction
compensation for thermocouples, current source errors for RTDs, and
hardware and software errors associated with the system, which depends
upon input path. RTD accuracies do not include errors due to lead
resistance. The hardware and software errors include calibration of the
system, and non-linearity of the ADC. For the sake of the calculations the
resolution of the ADC was assumed to be at least 16 bits (use of the
10Hz, 50Hz, and 60Hz filter frequencies). Note: The 250Hz frequency
should not be applied to thermocouple or RTD inputs if accuracy is a
concern.
Thermocouple
The following table provides the maximum error for each thermocouple
type when the 10Hz, 50Hz, or 60Hz filters are used and the module is
operating at 25°C and was calibrated at 25°C. Inaccuracies in the cold
junction compensation sensors are not included.
Thermocouple Max. Error
Type 25°C
J ±0.6°C
K -225°C to 1370°C ±1.0°C
K -270°C to -225°C ±7.5°C
T -230°C to +400°C ±1.0°C
T -270°C to -230°C ±5.4°C
E -210°C to +1000°C ±0.5°C
E -270°C to -210°C ±4.2°C
R ±1.7°C
S ±1.7°C
B ±3.0°C
N ±0.4°C
C ±1.8°C
The following table provides the maximum error for each thermocouple
type when the 10Hz, 50Hz, or 60Hz filters are used and the module is
operating at 0°C to 60°C and was calibrated at that temperature.
Inaccuracies in the cold junction compensation sensors are not included.
Thermocouple Max. Error
Type 0°C to 60°C
J ±0.9°C
K -225°C to 1370°C ±1.5°C
K -270°C to -225°C ±10.0°C
T -230°C to +400°C ±1.5°C
T -270°C to -230°C ±7.0°C
E -210°C to +1000°C ±0.8°C
E -270°C to -210°C ±6.3°C
R ±2.6°C
S ±2.6°C
B ±4.5°C
N ±0.6°C
C ±3.5°C