We are trying to get an old MAT 253 up and running again and have problems with getting the source linear for the range of 3 to 7 V. In the past there wasn't any problem with an extraction of 60%. Now we have an enormous drift of around 0,3 permille /Volt CO2, also with increased extraction.
The source is cleaned and std_on_off is very good after 15 minutes.
In the past the MAT was used with a GC/C-unit. Now we run it with a ConFlow III. I already suspect, that the interface could be the problem and not the source.
Any hints concerning the right source settings and other causes of this problem are appreciated!
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