Sharp EL-6490 Manual de usuario descargar pdf (Pagina 8)

The gun bias adjusts the brightness of the electron gun. The seamless

auto-bias by JEOL sets the optimum brightness over the entire range of

the accelerating voltage from the lowest voltage to the highest voltage,

with the possibility of manual override.

JEOL

’s unique stigma memory automatically corrects astigmatism caused

by a change of accelerating voltage or working distance. It makes selection

of optimum accelerating voltage for your application simple and quick.

The text on the HT icon displays “ OFF”

when the vacuum is ready for operation.

A click on the HT icon turns on the accelerating voltage and heats a fila-

ment at the optimum temperature and an image appears automatically.

You do not have to make any adjustment on the electron gun.

The shift of the image area is small when accelerating voltage is changed. Optimization of accelerating voltage is simple and quick.

10kV

1kV

5kV

20kV

Specimen: Paper

Fully Automated Electron Gun

The electron gun developed by JEOL is a micro focus gun producing a

very small electron source. The operation of the electron gun is fully

automated. You can quickly change the accelerating voltage suitable

for your application including observation and analysis.

The contrast of the SEM image changes with accelerating voltage. A

low-density specimen requires especially careful selection of accelerat-

ing voltage for the best result.

10m

Fully Automated Electron Gun

Seamless Auto Bias Control

Stigma Memory

Optimization of SEM Image by Accelerating Voltage

Electron probe

Alignment coil

Factory pre-centered

filament

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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Sharp EL-6490 Manual de usuario Pagina 8