Basic Alignment; Preparation For Basic Alignment; Calibrate To Preset Values; Alignment Of The Spectrometer - LEO 912 OMEGA Brief Manual

Microscope Operation
1.5
1.5.1
1.5.2
1.5.3
4

Basic alignment

SPECIAL NOTE:
Use a test specimen (e. g. carbon foil) for the entire alignment of the microscope.
Beam sensitive specimens are not useful for the alignment.

Preparation for basic alignment

•
Retract rod as far as it will go and turn it carefully somewhat counter-
clockwise to keep it in this position.
•
Insert AIS aperture and activate the AIS mode in the main menu.
•
Remove objective aperture.
•
Remove spectrometer entrance aperture and slit aperture.
•
Turn on high voltage and filament.
– Red LED on top of key FILAMENT is on. Red LED ON is blinking on HIGH
VOLTAGE key.
– Red LED ON on top of key HIGH VOLTAGE is on; High voltage has reached
it´s rated value; Emission current generally > 1µA; if not increase with encoder
CURRENT.
– Fluorescent screen is illuminated; if not move specimen, decrease
magnification,set δ E to zero, and adjust brightness.
•
Select magnification between 8.000x and 10.000x with buttons
MAGNIFICATION ∆ ∇

Calibrate to preset values

•
Calibrate objective lens current with button CALIBRATE in field FOCUS.
– while the objective lens is calibrated (indicated by 2 sound signals), the
illumination is off.
•
Calibrate IM. SHIFT in the menu CAL.

Alignment of the spectrometer

•
Reset energy loss to zero with button HCI/0eV in the menu δ E.
•
Switch to SPEC with button IMAGE/SPEC in the field SPECTROMETER.
– The spectrum caustic is visible on the screen.
•
Activate menu PARAMETER, push button CAL and then CALIBR. IM.
SHIFT and CALIBR. ILL. DEFL.
– The illuminating and imaging system are calibrated.
Basic alignment
LEO 912 OMEGA