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Appendix A
Specifications
A-6
ni.com
Accuracy Calculation Examples
The following are accuracy calculation examples:
•
Measurement of 760
°
C using J-type thermocouple at 28
°
C ambient
temperature; filter setting of 10 Hz:
accuracy is 0.42
°
C
•
Measurement of 760
°
C using J-type thermocouple with NI 4350 at
38
°
C and accessory (cold-junction sensor) at 23
°
C; filter setting of
10 Hz:
accuracy is 0.48
°
C as a result of
[0.42
°
C + (38
°
C – 35
°
C)
×
0.02]
•
Measurement of 760
°
C using J-type thermocouple with NI 4350 and
accessory (cold-junction sensor) at 38
°
C; filter setting of 10 Hz:
accuracy is 0.73
°
C as a result of
[0.42
°
C + (38
°
C – 35
°
C)
×
0.02 + 0.25
°
C]
•
Measurement of 1 V using 1.25 V range, filter setting of 60 Hz at 28
°
C
ambient temperature after 90 days of calibration with auto-zero; at 0 V
common-mode voltage:
accuracy is 119
µ
V as a result of
[1 V
×
0.0101% +18
µ
V]
•
Measurement of 1 V using 1.25 V range, filter setting of 60 Hz at 38
°
C
ambient temperature after 90 days of calibration, with auto-zero; at
0.5 V common-mode voltage:
accuracy is 139
µ
V, as a result of
[1 V
×
0.0101% +18
µ
V + (38
°
C – 35
°
C)
×
{1 V
×
0.0004%/
°
C + 1
µ
V/
°
C}+ (0.5V/10
100/20
)]
Analog Input
Input Characteristics
Number of channels................................16 differential
or 14 thermocouple
Digits ......................................................5 1/2
Type of ADC ..........................................Sigma-delta
ADC resolution.......................................24 bits, no missing codes
Calibration cycle.....................................1 year