Figure 84. Diagnostics Dialog Box Showing The Mass Calibration Page - Thermo Scientific LTQ Series Hardware Manual

Thermo Scientific
6. For negative ion polarity mode, do the following:
a. Select the first multiplier device name.
b. In the Value box, type the mass spectrometer's device value listed in
Table 10. Electron multiplier device settings for negative ion polarity mode
Device name
Multiplier 1 high gain (V)
Multiplier 1 normal gain (V)
Multiplier 2 high gain (V)
Multiplier 2 normal gain (V)
c. Click Set.
d. Repeat step 6a through
IMPORTANT Follow the next procedure to save the multiplier settings or they are
lost if you reset the system.
 To save the electron multiplier voltage settings
1. In the Tools list, choose Mass Calibration to open the Mass Calibration page
(Figure 84).

Figure 84. Diagnostics dialog box showing the Mass Calibration page

LXQ
–900
–900
–900
–900
step 6c to set the remaining multiplier devices.
5
Maintenance
Electron Multiplier Replacement
Table 10.
Device value
LTQ XL Velos Pro
–1000 –1300
–900 –1400
–1000 –1300
–900 –1400
LTQ Series Hardware Manual 121