6 Replies Latest reply on Nov 15, 2018 1:12 PM by wmd1861

    5973 Autotune

    wmd1861

      We have been observing split peaks in our 5973 autotunes. The splitting is not consistent as it moves among the main masses (69, 219 and 502). We have cleaned and replaced just about everything to no avail. Has anyone observed the same phenomenon? How was it resolved? Thanks.

       

      BillTUNE_2018_08_07.jpg

        • Re: 5973 Autotune
          gchaplain

          Hi Bill,

           

          Has this only just started occurring? Or has it been occurring for a long time or a gradual thing?

           

          So from my understanding you have cleaned the source/replaced the source, is the DC polarity correct? (on side of MS chamber door (see below). Also what is the flow rate of gas into the MS? do you have the vacuum parameters?

            • Re: 5973 Autotune
              wmd1861

              The observed splitting appeared suddenly; there were no shoulders that evolved into these splits.  The source has been cleaned, the helium flow rate is 0.8 mL/min and the polarity is set correctly.  Vacuum gauge reads 2.5x10-5 torr

               

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                • Re: 5973 Autotune
                  gchaplain

                  You can try loading an older tune. Sometimes the tunes can get out of touch. So on tune and vacuum control then Restore Previous tune. The look for one from a few months ago.Tune again with the old tune and hopefully it may resolve your issue.