Figure 83. Diagnostics Dialog Box Showing The Electron Multiplier Voltage Parameters - Thermo Scientific LTQ Series Hardware Manual

5
Maintenance
Electron Multiplier Replacement
120 LTQ Series Hardware Manual
4. Scroll down the Device list to display the electron multiplier voltages

Figure 83. Diagnostics dialog box showing the electron multiplier voltage parameters

5. For positive 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 9. Electron multiplier device settings for positive 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 5a through
Multiplier parameters
LXQ
–800
–800
–800
–800
step 5c to set the remaining multiplier devices.
(Figure 83).
Table 9.
Device value
LTQ XL Velos Pro
–900 –1200
–800 –1300
–900 –1200
–800 –1300
Thermo Scientific