Alpha Slit; Z4 Restrictor; Using The Autotune Facility - Waters Autospec Premier Operator's Manual

Alpha Slit

Alpha Slit defines the ion beam in addition to the source slit (set or the
Control 1 tab in the Source Slit control box). You can use it to correct source
tuning problems, such as peak mass tails, but the ion beam intensity is
sometimes reduced. If the Alpha Slit does not remove any tailing, leave it fully
open.
See "AutoSpec functionality" on page

Z4 Restrictor

Z4 Restrictor controls the Z Restrictor 4 plate, which restricts the height of
the ion beam before it enters the collector slit. You can use it for tuning in the
30000 to 80000 resolution range, because it helps to reduce Z focus tailing at
these resolutions.
See "AutoSpec functionality" on page

Using the AutoTune facility

Via the Autotune facility you can automatically tune the instrument as an aid
to initial tuning. If this tuning fails, tune the instrument manually. Perform
manual tuning after autotuning to optimize the peak shape.
This section describes how to perform the basic autotuning procedure.
Note:
To perform more comprehensive autotuning using the controls available in the
AutoSpecAutoTune dialog box, contact Waters for advice.
To prepare for an autotune procedure
1. On the Tune window's Control 1 tab enter 7950 (that is, the maximum
value minus 50 for Accelerating V). Do not use the slider.
2. Ensure that a peak appears in the Tune window peak display.
See "To look for an ion beam" on page
3. Click
The AutoTune Progress window and AutoSpecAutoTune dialog box
Result:
open.
. and then click
G-2.
G-2.
2-3.
.
Using the AutoTune facility 2-19