
Chapter 8 Maintenance and Troubleshooting
8-12 PerSeptive Biosystems
8
Poor mass accuracy in
Delayed Extraction mode
(external calibration only)
High voltage power
supplies not warmed
up
Start high voltages by clicking
on the toolbar
before calibration.
Standard and sample
of interest not in
adjacent sample
position
Calibrate using standard that
is in a sample position
adjacent to the sample of
interest.
Incorrect calibration
constants used
Recalibrate with known
standards and correct
masses.
Make sure correct calibration
file is selected in the
Calibration field on the
Instrument Settings control
page.
Correct initial velocity
not specified
Specify Initial Velocity in .BIC
file before acquisition by
selecting matrix. For more
information, see “Matrix
influence” on page 5-22.
Table 8-1 Spectrum Troubleshooting (Continued)
Symptom Possible Cause Action
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