Axis BTA 2100D Manual do Operador descarregar pdf (Página 198)

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Maximum Ionization Time

This sets the limit for the longest ionization time which AGC can use. For

maximum sensitivity, start with the default value of 25,000 µsec. In certain

special cases a smaller value may be used, e.g., to reduce unwanted ion-

molecule reactions. The highest Maximum Ionization Time can be set is 65,000

µsec.

Prescan Ionization Time (µsec)

This ionization time determines the number of ions formed for the prescan. This

value is then used to calculate the ionization time for the analytical scan. The

preset value of 100 µsec works for EI operation. For cases where few ions might

be formed in the prescan (e.g., EI-MS/MS) use a large value such as 1500 µsec.

Care must be exercised, however, since a large value could produce so many

ions in the EI mode that the prescan becomes saturated and AGC no longer

functions properly.

Background Mass

The lowest mass used to determine the target TIC (total ion current) value; all

ions of lower mass are ejected from the ion trap before the AGC prescan pulse.

The background mass can be set to any value from 10 m/z to 300 m/z; it is

typically set to 45 m/z. The background mass should always be set at least two

m/z higher than the Ionization Storage Level.

rf Dump Value (m/z)

This value specifies the high m/z used for the prescan. It should always be as

high or higher than the analytical scan range high mass. In most cases, leave at

the default value of m/z=650. In certain circumstances, operating at 400 or 450

(matching the analytical scan) may allow operation in spite of “high mass noise”.

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