DataGet Thermocouple Interface
How to collect
temperatures accurately
The DataGet thermocouple module combines a
+/-0.2C accurate temperature reference with a 24 bit Analog Digital
Converter (ADC) to give you the most precise Palm based thermocouple
reader.
All thermocouple readers must adjust for
the local temperature. Inexpensive systems use a cheap transistor to
“compensate” for the local temperature.
The DataGet cartridge uses a precision
thermistor, hooked to our 24 bit ADC to adjust for local temperatures.
Thermocouples are not linear, and the
electronics must compensate for this. Simple readers use a look up table
to adjust for errors. These work well for some temperatures but are not
so accurate at other temperatures.
DataGet software uses proprietary
Chebyshev Polynomials to provide +/- 0.05 degree accuracy over the
entire j and k thermocouple range. It also saves space on the handheld,
and is fast to calculate.
DataGet Thermocouple
Specifications
|
| A/D
converter resolution (bits) |
24 |
| Thermistor
accuracy |
+/-
0.2C |
| Thermocouple
temperature range |
-200C(-328F)
to
1250C(2282F) |
| Thermocouple
types |
j,k |
| Jack
type |
mini
plug |
| Display
units |
C
or F |
| Active
power |
<10mW |
| Shutdown
power |
<400µW |
| Calibration
points |
2
or 3 |
| Max
sample rate |
<1
seconds |
|
|
