5 OPERATION
EM210F-1
5-41
5.4.4 Minimum Dose Exposure (MDS)
This operation reduces considerably the electron beam irradiation on the specimen. The
electron beam illuminates the specimen while photographing is performed only. Three
modes are provided (SEARCH FOCUS and PHOTO SET).
1.
Carry out the initial setting.
a.
Select “Option” on the main menu TEM Controller screen (
F
Sect. 4.4.2)
to display the MDS screen (
F
Sect. 4.4.6j).
Fig. 5.38 MDS screen
2.
Set the After Photo mode (
F
Item
②
in sect. 4.4.6j), beam blanking time,
beam blanking method (
F
Item
③ in Sect. 4.4.6j
) and delay time (
F
Item
④
in Sect. 4.4.6j).
?
The electron beam is cut off for a specific period of time, called the blanking
time, just before the shutter opens.
?
The electron beam is cut off for a specific period of time, called the delay time,
is the period of time just before the shutter opens after the blanking time has
elapsed.
?
The “Enter” key should be depressed to enter all the information set in this
step.
