Thermo Finnigan LTQ - Page 150

MS Detector Maintenance
Replacing the Electron Multiplier
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4-42 ______________________ Finnigan LTQ Hardware Manual _______________________
a. Choose Start > Programs > Xcalibur > LTQ Tune to open the
Tune Plus window.
b. From the Tune Plus window, choose Diagnostics > Diagnostics.
c. Select (General) Graphs to display the Graphs page.
d. In the Set Device Value option box, select Multiplier 1 (V) or
Multiplier 2 (V).
e. In the text box to the right of the Set Device Value option box, enter
-800.
f. Click on the Set button to set the electron multiplier voltage to
-800 V.
g. Click on the OK button to return to Tune Plus.
18. Calibrate the electron multiplier voltage as follows:
a. Allow the system to pump down for at least one hour before you turn
on the high voltages.
b. Set up for the infusion of the tuning solution into the MS detector as
described in LTQ Getting Started.
c. From the Tune Plus window, choose Control > Calibrate. The
Calibrate dialog box appears.
d. Click on the Semi-Automatic tab to display the Semi-Automatic
page.
e. Select the Electron Multiplier Gain option. Click on the Start button
to start the multiplier gain procedure.
19. After the Electron Multiplier Gain program is finished, set up for
operation as described in LTQ Getting Started.