Page 64 Leica EM TIC 3X Operating Manual 07/17
4.4.2.2 Status information and programming
As soon as the PUMP button is pressed the
system starts evacuating the chamber down
to < 1 x 10
-5
mbar. The rotating yellow sign
indicates evacuation in progress. As soon as
the working vacuum is reached the sign
turns green.
Cooling status is activated as soon as the
cryo-stage is connected and initialized.
As soon as the set voltage is reached the
sign in the HV field turns from a rotating
yellow (in progress) to green.
When the cutting process has started with a set voltage higher than 8 kV, the
cutting voltage is increased from 8 kV in increments of 0.5 kV until the voltage
entered is reached. The dwell time for each voltage increment depends on the
stability of the ion source. If the source current is within the tolerance range of
the set point for 20 s, the voltage is increased by 0.5 kV. This ramp-shape
increase in the cutting voltage helps to stabilize the ion source at higher
voltages and prevents contamination caused by sparking.
Once the process has started, the sign in the Load-Up line turns to yellow (in
progress). It becomes green as soon as the process is finished.
