Obtaining An Ion Beam - Waters GCT Premier Operator's Manual

Obtaining an ion beam

To obtain an ion beam:
1. In the MassLynx Tune window, click
2. In the TDC Settings dialog box, clear the Low Mass Cut-Off check box.
See also:
3. In the Tune window, click
Confirm that the instrument status indicator displays green.
4. In the EI Tune tab, type the recommended starting parameter values
shown in the table below, or specify previously saved values.
Recommended Tuning starting values:
Parameter
MCP Voltage
Source Temperature
Electron Energy
Trap Current
Ion Repeller
Emission current
Beam Steering
Focus 1
Focus 2
Focus 3
5. Click View > Peak Display 2.
Result:
6. Click
Low Mass Cut-Off on page
The second peak display appears.
.
.
B-16.
.
Recommended
EI value
2700
200
70
100
1
Not applicable
0
70
14
40
Obtaining an ion beam
Recommended
CI value
2700
120 to 150
70
Not applicable
Not applicable
250
0
70
14
40
3-3