Prepare For Beam Alignment - Hitachi HF2000 TEM Operation Manual

3. Applying HV
•
Apply HV when vacuum is good
•
Make sure that the applying HV conditions are set at following state:
•
Press the [FE] bottom once (left panel) and press [FLASH] when it's flashing. IF current rise up, if the
IF current is lower than 0.30 mA, repeatedly press [FLASH] bottom till IF current is > 0.30mA.
•
After IF current exceeds 0.30mA, wait till V0 VOLTAGE rises up to 200kV. Then V1 and V2 Voltage
rises gradually up to the setting value (watch the ACC VOLT on the CRT monitor).
•
Enter the V1 Voltage and IF current on the log book (Yellow book).
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When the emission current drops below 10µA, press [I1C] and recalibrate extraction voltage to raise the
emission current to 30µA. The beam wander off during the process but return by the end of the I1C state.
Repeat alignment procedure because the changed extraction voltage affects the caustic.
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4. Prepare for beam alignment

•
Press [ANA1] to change selected mode: Analysis → TEM mode.
•
Reset switch (Red square button)
V0 VOLTAGE
R RATIO
I1 CURRENT
Left main panel
[I1C]
[FLASH]
4
200kV
5.5
30µA