User manual

Chapter 5 Transducer Conversion Functions
© National Instruments Corporation 5-9 NI-DAQ User Manual for PC Compatibles
data sheet), you can edit the thermistor conversion routine to use your own
a, b,andc values.
a = 1.295361E–3
b = 2.343159E–4
c = 1.018703E–7
Figure 5-2. Circuit Diagram of a Thermistor in a Voltage Divider
Thermocouple_Convert and Thermocouple_Buf_Convert
These functions convert a voltage or voltage buffer that NI-DAQ read from
a thermocouple into temperature.
Parameter Discussion
The TCType integer indicates what type of thermocouple NI-DAQ used to
read the temperature. Constant definitions for each thermocouple type are
shown in the conversion header file. You can use the constants that have
been defined, or you can pass integer values to the routine.
1: E
2: J
3: K
4: R
5: S
6: T
7: B
8: N
R
t
R
1
V
ref
Volts