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Appendix A
Specifications
A-4
ni.com
Thermistor Accuracy (with I
EX
or I
EX0
)
1
DC Voltage Accuracy
2
Note
To learn how to calculate DC voltage accuracy, and if you have a thermistor other
than 5,000 K, refer to
ni.com\support
and then click
KnowledgeBase
under
Option 3
.
Enter
1W3E9CHE
in the search field to access the entry called
How to Calculate the
Accuracy of a Specific Resistance Sensor
.
1
Thermistor accuracy is valid for all filter settings. Specifications assume that the 25 k
Ω
range is used and worst case
common-mode voltage for this range is present. Specifications improve if actual common-mode voltage is less than worst
case.
Accuracy (°C)
15 °C–35 °C, 1 Year,
Filter Setting: 10 Hz,
50 Hz, 60 Hz
Temperature
Coefficient
0 °C–15 °C,
35 °C–55 °C
Thermistor
°C
°C
°C/°C
5,000
Ω
0–50
0.03
0.001
2
Voltage specifications do not include errors resulting from common-mode voltages. Calculate additional errors because of
common-mode voltages as: common-mode voltage/10
(CMR specification in db/20)
.
Range
(Volts)
% of Reading
15 °C–35 °C
Add
µ
V
(with Auto-Zero)
15 °C–35 °C
Add
µ
V
(without Auto-Zero)
15 °C–35 °C
Temperature
Coefficient
0–15 °C,
35 °C–55 °C
Filter Setting
Filter Setting
24 Hour
90 Day
1 Year
10 Hz
50 Hz
60 Hz
10 Hz
50 Hz
60 Hz
% Reading/
°C
µ
V/°C
15
0.0146
0.0175
0.0205
28
117
141
130
193
210
0.0009
5
7.5
0.0152
0.0181
0.0211
21
71
106
125
160
185
0.0009
5
3.75
0.0164
0.0193
0.0223
14
30
42
120
131
140
0.0010
5
2.5
0.0066
0.0095
0.0125
5
17
24
24
32
37
0.0004
1
1.25
0.0072
0.0101
0.0131
3
12
18
22
29
33
0.0004
1
0.625
0.0084
0.0113
0.0143
2
6
11
22
24
28
0.0005
1