Axis BTA 2100D Manual do Operador descarregar pdf (Página 78)

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101

Two filaments are provided to reduce down time for maintenance. The selection

of the filament is made by choosing the radio button. The Axial Modulation

voltage can be changed by using the up/down arrows and then clicking the apply

button.

The Axial Modulation Voltage is applied to the endcap electrodes as described in

the section Saturn Method Editor. Proper setting of this voltage is critical to

resolution and sensitivity in the ion trap. In most cases, the best Axial Modulation

voltage is the lowest value at which there is still good resolution of the 131/132

and 414/415 cal gas peaks. For most instruments this value will be between 2

and 4 volts.

The Axial Modulation voltage must be adjusted to its proper value before the

AGC target TIC is determined and before the mass calibration is done.

If the value of the Axial Modulation voltage is too low, high molecular weight ions

will not be observed. If the value for the Axial Modulation voltage is too high, the

peak widths for low molecular weight ions will be broadened and mass

misassignments may occur.

NOTE: The mass calibration must be done if the axial modulation setting is

changed. See the autotune section for mass calibration.

Adjustments

The third tab is the Adjustments tab. Clicking on this tab will bring up the screen

below.

This tab is used to adjust the Cal gas pressure, the CI reagent gas pressure,

select the CI reagent, and to adjust the rf ramp.

When you select Adjust rf Tuning Ramp, you obtain a screen from which you

can determine if the rf voltage is in tune throughout the entire mass range of the

Saturn GC/MS. This is done by observing the rf modulator response.

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