When HV has been applied, click SET button after changing HV

 

value.

• Set Ie to

button shows a pull down list of Ie (emission current) value.

 

Select a Ie value.

• Vext indicator

Extracting voltage value is indicated.

• Flashing button

The button further opens Flasing controller. This button is disabled

 

while HV is applied.

(3) Flashing controller

Intensity

Selects flashing intensity. Use “2” for usual operation.

Execute button

Executes flashing. Emission current caused by flashing will be

 

indicated on the HV indicator about 2 seconds. Just after HV OFF

 

or after flashing, 30 seconds wait time is necessary. If click Execute

 

before 30 seconds passed, flashing will be executed after waiting

 

rest of time.

(4) Beam Monitor button

 

Beam Monitor function is provided to reduce the tip noise, which is a low frequency noise caused by fluctuations of the emission current. Dividing the image signal by a reference signal that is proportional to probe current can stabilize it. It is recommended to keep Beam Monitor ON for normal operations.

When the indicator above Beam Monitor button is green, the beam monitor function is working. If the indicator is OFF or blinking in red, click the button to turn it back on.

Beam Monitor adjustment (adjustment of the reference voltage) is activated automatically at the start of ABCC function if Adjust Beam Monitor is checked in the ABCC area of the Image tab of the Setup dialog window. Normally, check this box. Uncheck this box in special cases such as when the Beam Monitor reference signal needs to trace the drift of the emission current; for example, during quantitative X-ray analysis using a probe current drift cancellation function, etc.

To disable beam monitor function, uncheck Beam monitor Active in the SCAN MODE block of the Operation panel.

2 - 27