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Resolution/Axis fail at startup tune Agilent 8900.

lisandrom91

Hi everyone.

Last week we had a problem of low sensitivity during startup tune (The problem has been always m/z 7, as 89 and 205 always meet the minimum recommended requeriments)

But last week particularly it went to 15 counts of m/z 7 and it was taking several minutes to tune the lenses (more than 10), so I stopped the autotune start up before it finished.

So I cleaned and conditioned the cones, cleaned lenses and sample introduction. Doing this usually does the trick and rises the sensitivity (but never achieving the minimum counts of m/z 7, which is 3300)

But on this ocassion, the start up tune gives this error:

Any ideas? Is this a serious problem? It never happened to me.

Thanks.

  • 0

    Hi, 

    have you tried to run the Resolution/Axis from the Dashboard for each of the Quads?

    Start with Q1 and then Q2.

    How old is this Instrument.

    Have you tried another tune solution? 

    You are not running the startup with "user tune", are you?

    Cheers

    Chris

  • 0 in reply to cschulz

    Hi again chris. Update. I did something that hopefully may have solved the problem.

    I went to user tune, and started singal monitor. As mass 7 was low (100 counts), I know that changing Q1 exit to a more negative, drastically rises it. So I selected -5 V and then runned the Autotune (No gas, single quad, very similar to standard tune).

    And the results were incredibly fine, at least for what I am used to. (report attached) and it detected Q1 exit -7 V as a good value.

    How do I export this conditions to the hardware? I mean, if I run again standard tune, it may give low cps again and even the error when doing the Res/Axis

    And what do you think about that value in Q1 exit? Would it be a problem?

  • 0 in reply to cschulz

    Hi Chris. I did as you said. Results: Q2 looks better, but both have really low 7 counts.

    our equipment is 5 years old, I tried another solution, and the tune is the standard, not the user tune.

  • 0 in reply to lisandrom91

    Hi again,

    my suggestion is to ask an agilent representative to exchange the quadrupole feedthrough contacts (both on Q1 and Q2).

  • 0 in reply to lisandrom91

    The mass ratio is way off.  See if you can adjust the Omega Lens and Omega Bias to bring the Tl205 down and Li7 up.  Tl205 should not be greater than Y89.  First, try moving the slider bar for each to an extreme (right and left) which should drop all signal to zero.  If not, there is an issue with voltage to that lens.  With the plasma off, run the shortage test.  Click the Hardware button, Click the Ion Lenses Icon and select Maintenance.  Then click the run shortage test entry above the table.  Check the lens contacts in the interface with the lenses removed.

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