Axis BTA 2100D Instrukcja Operatora Pobierz pdf (Strona 79)

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When the rf Modulator Response screen is displayed, it shows a real time view

of the rf modulator response from 20 to 650 m/z. The vertical axis of the display

is in percentage of counts, and the horizontal axis is mass units. One scan, over

the entire mass range, requires about 1s.

The Counts are displayed as Average rf modulator response and Highest rf

modulator response in counts.

To monitor the rf voltage, observe the displayed ramp. If the rf voltage generator

circuit is properly tuned, the ramp will rise gradually in a generally straight line

from low mass to high mass without any sudden rises in the ramp, and the

Average number counts will be less than 1000. If the rf voltage generator is not

tuned properly all the way to 650 m/z, the end of the ramp will rise sharply at the

mass above which the generator is out of tune, and the Average number of

counts might be above 1000. If this is the case, the rf voltage amplitude must be

adjusted.

The text just to the left of the rf button will tell you if an adjustment is necessary. If

the rf voltage is tuned throughout the entire mass range, you will receive the

following message:

rf response within limits

continue adjustment to minimize highest reading

If the rf voltage is out of tune, you receive the following message:

rf response out of range adjust the rf screw

for a linear response

The rf coil is tuned by adjusting its resonant frequency to match that of the output

of the rf generator board. This is done as follows.

Open the front door and insert a flat head screwdriver into the tuning rod within

the hole labeled “rf ADJUSTMENT” on the lower part of the front panel.

Slowly turn the screw clockwise until the slope of the ramp increases, then turn

the screw counterclockwise until either the slope of the ramp is at its lowest or

there is a sudden rise at the end of the ramp. At that point, turn the screw three

turns clockwise and verify that the Average number of counts is less than 750

and the Highest number of counts is less than 1500. If they are, the coil is

successfully adjusted. If not, run Diagnostics and call a qualified service

representative.

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Axis BTA 2100D Instrukcja Operatora Strona 79

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