Scheme of reading to 4-wire for thermometer (PT100) - Application and Features

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Scheme of reading to 4-wire for thermometer (PT100) - Application and Features

Post  Alessandro on Sat Dec 12, 2009 1:40 am


The thermometer (PT100) was connected in the following way:




Setting scan for reading thermometer PT100, Single read channel (CH1, 1001)
(Subsequent Triggers Every = 3s, Scan Count = 192):



File type data obtained (Switch multimeter 3706 / Excel / Matlab):
In the columns we have respectively:Time(s)/Temperature(K)



The measured values are sensitive to the fifth digit after the decimal point.
Matlab approximates to the second digit after the decimal point, is a problem to be solved!

Graph obtained with Matlab:



Conclusion:
We can see the good sensitivity of the thermometer PT100, also obtained by connecting a 4 wire.
The measures are not very stable in the environment of the laboratory,
this causes a variation of about 0.5K, but is due to the environment.
However, the temperature variation is contained in a fairly narrow range between a point and the next
, see chart.

The measured data are as follows, are then approximated by matlab
(see above):

Temperature (K)
295,22980
295,22300
295,22032
295,21635
295,21972
295,21768
295,21372
295,21350
295,21150

The thermometer has therefore a high sensitivity!
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Alessandro

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Matlab and significant digits after the decimal point

Post  Alessandro on Mon Dec 14, 2009 5:51 pm

The problem was solved using the setting of type "long" for the values placed in the matrix.
Our host in the case are the temperature measurements made with the PT100.
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