Voyager DP-263-S Guía de usuario Pagina 469

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Troubleshooting
Voyager
Biospectrometry
Workstation User’s Guide 8-17
8
On Voyager-DE PRO and
Voyager-DE STR
systems, cannot see high
mass ions in Reflector
mode
Refer to “Flat signal
on oscilloscope or in
spectrum window for
sample region
(matrix peaks seen)”
symptom on
page 8-7
Refer to “Flat signal on
oscilloscope or in spectrum
window for sample region
(matrix peaks seen)” action
on page 8-7.
Ions not reaching
detector
(Accelerating Voltage
too low)
Verify that you can see ions in
Linear mode, then adjust
voltages in Reflector mode
and rerun. See
Section 5.4.4.2, Setting
Accelerating Voltage, and
Section 5.4.3.5, Optimizing
Grid Voltage%.
Ions fragmenting
before reaching the
detector
(Accelerating Voltage
too high or Grid
Voltage too low)
High mass ions
fragmenting when you are
using
α
-cyano matrix
Internal energy of
ions causing
fragmentation
Use Sinapinic acid matrix
which yields ions with a lower
internal energy than
α
-cyano,
and therefore causes less
fragmentation of high mass
ions.
Masses off by 22 or 38 Da Sample ionized to
[M+Na]
+
or [M+K]
+
,
instead of [M+H]
+
No action. Data accurate.
Observed mass not equal
to monoisotopic mass
Observed mass is
average mass,
except when
resolving isotopes
No action. Data accurate.
Table 8-1 Spectrum Troubleshooting (Continued)
Symptom Possible Cause Action
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