Voyager DP-263-S Betriebsanweisung Seite 424

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Chapter 7 PSD Analysis
7-20 PerSeptive Biosystems
7
Generating an
external
calibration for the
precursor ion
To obtain maximum mass accuracy for the precursor ion,
generate an external calibration file that you will use when you
perform the PSD acquisition. This external calibration is used
to determine the
t
p
value (precursor ion flight time) needed for
the PSD calibration equation (described on page 7-8). The
t
p
value is determined using the standard calibration equation
(“t” in the standard equation described on page 6-9).
NOTE: The calibration you specify on the Instrument
Settings Control page is used to determine the
t
p
value
(precursor ion flight time) needed for the PSD calibration
equation (described on page 7-8). The
t
p
value is
determined using the standard calibration equation (“t”
in the standard equation described on page 6-9). You
will also specify an external PSD calibration below,
which is used to determine the values for
α
,
β
, and
γ
needed for the PSD calibration equation.
To generate the calibration:
1. Open the precursor spectrum data file in the Data
Explorer software.
2. Create a single-point calibration using the precursor ion
mass. For more information, see the
Data Explorer
Software User’s Guide
, Section 5.3.2, Manually
Calibrating.
3. Export the calibration constants. For more information,
see the
Data Explorer Software Users Guide
, “Exporting
.BIC, .MSM, and .CAL” on page 1-32.
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