Agilent Technologies 9191610, User Manual

Page: 88 / 98

5 Technical Information
Exchange of the High Voltage Feedthrough
88/98 VacIon Plus 300 pumps User Manual / 87-900-103-01 (H)
Leakage Current Check
If the pump current reading is to be used as pressure measurement,
check the pump leakage currents as follows:
1
Turn off the pump control unit.
2
Remove the pump magnet.
3
Turn on the pump control unit and wait for current stabilization.
The current reading should not be higher than 300 nA. Make sure
that the control unit and the high voltage cable leakage current is
negligible.
4
If leakage current comes from the pump, perform "high-potting"
per the following procedure; then recheck the pump and install
the magnet.
5
If it is not possible to "high-pot" the pump, the pressure reading is
based by the leakage current value.