
Appendix H Continuous Extraction Mode
H-24 PerSeptive Biosystems
H
Poor mass accuracy in
Continuous Extraction
mode
(continued)
Crystals did not form
homogeneously on
sample spot
Prepare new sample spot.
See “Guidelines for good
crystallization” on
page 3-30.
Use mass closest to the
mean (for external
calibration only):
1. Acquire six averaged
scans (six .DAT files)
from one sample well.
2. Check masses in
Voyager processing
software.
3. Use the file with the
mass value closest to
the mean.
High voltage power
supplies not warmed up
Start high voltages by
clicking [add icon]
30 minutes before
calibration.
Samples and standards
not in adjacent wells
For optimum mass
accuracy, place standards
in wells adjacent to the
samples for which you are
calibrating.
Samples or standards
spotted in outer wells on
sample plate
For optimum mass
accuracy, do not use outer
wells of sample plate.
Table H-8 Spectrum Troubleshooting (Continued)
Symptom Possible Cause Action
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