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Linearity problems with Agilent 6890 GCFID

avatar: the pass
the pass
1 posts
Replied to the pass post on February 16th, 2017

Hi All

I rang the agilent Linearity standard containing C17 18 19 20 22 and C24

up to C22 all very linear but the largest peak C24 is not giving me the ratio i need which is 10 times that of C22

I have tried numerous liners  column changed jets  collectors and got a colleague to run the standard and  we get the ame ratio between C22 and C24 of about 6 when it should be 10

due to the fact we have changed out practicallly we can and the result is very stable but incorrect would it be the signal board or the fact tat we have reached the top of th elinear range C24 is very concentrated

any suggestions very welcome 

Martin