Programming Menu; Menu Items - OCI BDL800IR Instruction Manual

6 Programming Menu

6.1 Menu Items

The following table gives a brief description of what function do items under Programming
mode have.
Menu Item
Constant Beam
Mode
Grid LEED Mode
Beam Energy Scan
Mode
PC Control Mode
Parameters Limita-
tion
Options
By Filament
By Wehnelt
Setting
Proportional
Constant Gap
Continuous
Step
Full
External
Max Filament Cur-
rent
Max Beam Energy
Description
Automatically adjusts filament current to
maintain constant value of beam current.
Automatically adjusts Wehnelt voltage to
maintain constant value of beam current.
Sets a rate at which constant beam current is
maintained (feedback parameter).
Sets grid voltage to be proportional to beam
energy.
Sets grid voltage to maintain a constant dis-
tance (voltage gap) from beam energy.
Sets beam energy to be continuously
scanned.
Sets beam energy to be changed stepwise by
specified voltage (Delta U) and at specified
time interval (Delta t).
The following functions of the power supply
are fully controlled by a PC: beam energy,
filament current and Wehnelt, focus, grid
(LEED only), and screen voltages. In addi-
tion, emission and beam current are moni-
tored.
Only beam energy is controlled by a PC, oth-
er parameters are controlled via the front
panel.
Sets the maximum allowable filament cur-
rent.
Sets the maximum allowable beam energy.
Chapter 6 Programming Menu 29