Axis BTA 2100D Instrukcja Operatora Pobierz pdf (Strona 88)

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sensitivity and resolution. This setting is also the value displayed in the Set

Points dialog, in the Electron Multiplier voltage field.

Mass Calibration

The mass calibration function adjusts the rf Scale for a coarse full mass range

calibration and, then locates several FC-43 masses for a multi-point calibration

curve.

To initiate mass calibration based on FC-43, click the button to the left of FC-43

Calibration. When you initiate the program, the calibration compound valve is

opened, and the electron multiplier, filament, and rf voltage are turned on

automatically. The program then automatically uses the calibration compound

peaks at masses 69, 131, 264, 414, 464, 502, and 614 to create a calibration

curve.

Factors Affecting the Mass Calibration:

 The program also uses the air peak at mass 28 for the calibration of low

masses. Any air leak results in a distorted calibration at low mass. Therefore,

do not run the Mass Calibration program if your instrument has an air leak.

 If one or more of the mass peaks are not found by the program, the rf voltage

amplitude might need to be adjusted.

 Temperature changes can adversely affect the mass calibration and this

procedure should be initiated after the manifold has reached its equilibrium

point (i.e., approximately 3 hours after the set-point temperature has been

established).

An ideal slope (that of a straight line calibration) is 6.300 steps per atomic mass

unit. You will generally obtain a slope of 6.3 0.1. The standard deviation should

be 0.15 steps per atomic mass unit or less. (If the standard deviation you obtain

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Axis BTA 2100D Instrukcja Operatora Strona 88

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