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Temperature Sensor Output and Accuracy
You can make similar calculations when you use a 10 Ω
ground-reference resistor instead of a 10 MΩ resistor.
If your application demands very high accuracy, you can eliminate
this error by removing the appropriate pull-up resistor network or by
calibrating the system offset.
The VXI-TB-1303 temperature sensor voltage output varies from 1.91 to
0.58 V over the temperature range, as shown in Table 4.
Table 4. Temperature Sensor Voltage Output Accuracy
Temperature Range
0° to 15° C
15° to 35° C
35° to 55° C
* Includes the combined effects of the temperature sensor accuracy and the
temperature difference between the temperature sensor and any screw terminal. The
temperature sensor accuracy includes tolerances in all component values, the effects
caused by temperature and loading, and self-heating.
To select and read the temperature sensor, refer to your LabVIEW,
®
LabWindows
/CVI, NI-DAQ, or other software documentation for
programming information.
Alternatively, you can use the following formulas to convert the
cold-junction sensor voltage to cold-junction temperature:
T(°C) = T
- 273.15
K
where T
is the temperature in kelvin
K
a = 1.295361 x 10
b = 2.343159 x 10
c = 1.018703 x 10
= resistance of the thermistor in Ω
R
T
=
Ω
R
5,000
T
2.5 V
V
= output voltage of the temperature sensor
TEMPOUT
°
[T( C)]
9
°
T( F) =
5
Voltage Output Accuracy*
-3
-4
-7
V
TEMPOUT
−
TEMPOUT
+
32
10
±1° C
±0.65° C
±1° C
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