Voyager DP-263-S Betriebsanweisung PDF herunterladen (Seite 319)

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101

Before You Begin

Voyager

™

Biospectrometry

™

Workstation User’s Guide 6-7

6.1.3 Calibrating the Mass Scale

This section describes:

• Types of calibration

• When to calibrate

• Calibration equations

• Default calibration

• Generated calibration

• Acquiring calibration standards

Types of

calibration

The Voyager software includes a default calibration routine

that provides adequate mass accuracy for many applications.

If you require optimum mass accuracy, you can generate a

calibration based on the observed time of flight of the known

masses of calibration standards. The Calibration function in

the Voyager system allows you to generate four types of

calibration:

• Default calibration—Provides typically 0.1% accuracy

in Linear mode, and typically 0.01% or better accuracy

in Reflector mode.

• External calibration—Provides 0.05% accuracy in

Linear mode, and 0.01% or better accuracy in Reflector

mode. To perform external calibration, you create a

calibration (.CAL) file in the Data Explorer software

using standards of known mass. You then specify the

file in the Instrument Control Panel when acquiring

data, or apply the file to existing data in the Data

Explorer software.

• Internal calibration—Provides accuracy of 0.02% or

better in Linear mode, and 0.002% (20 ppm) in

Reflector mode. See Appendix A, Specifications, for the

internal calibration mass accuracy specification for your

system type. To perform internal calibration, you include

an internal standard in your sample. You then display

the data file in the Data Explorer software and calibrate

using the internal standard.

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