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Waters

Flagged peaks (!) and failed calibration on Qtofs/Tofs - WKB10448

Article number: 10448

SYMPTOMS

  • Calibration fails
  • Flagged peaks ('!') are seen on the acquired data in the calibration window
  • Happens with both sodium formate and sodium iodide

ENVIRONMENT

  • Synapt G2
  • Synapt G2-S
  • Synapt G2-Si
  • Synapt XS
  • Xevo G2
  • Xevo G2-S
  • Xevo G2-XS
  • MassLynx 4.1
  • MassLynx 4.2
  • UNIFI

CAUSE

Mass position is off

Spectral resolution on the instrument is either too low or does not match that set in Acquisition Settings

FIX or WORKAROUND

  1. Check that Veff is set correctly
  2. Ensure that resolution and peak shape is suitably tuned for the mode used (sensitivity, resolution, or high resolution) using pusher offset and reflectron grid parameters.
  3. Confirm that the Resolution field in the Acquisition Settings box is appropriate for the mode, but also similar to the actual resolution displayed by the instrument.
  4. Rerun the calibration.

ADDITIONAL INFORMATION

 

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