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Technical Information
iSTEP
The iSTEP is a new way of successfully control and start the ion pumps in the very
low pressure range.
Normally, when normal STEP function is active, if pump has difficulty to start after a
fixed time the controller automatically switches from 7 to 5kV and then again from
5 to 3 kV.
The consequence is that, if the pump did not start at 7 kV in the fixed time, the
pump does not start at all and the reading.
To overcome this issue the controller stays on 7kV until a current threshold is
reached (default 30nA) → current threshold instead of time.
This new feature is called iSTEP (or «intelligent» STEP mode).
The threshold is configurable so to set a current value slightly lower than the
expected current according to the pressure.
Example:
working pressure 1*10
the threshold to be set is 500Na.
182
-9
mbar with a medium size pump (55 l/s);
Agilent IPCMini Ion Pump Controller User Manual
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