Short Circuits; Typical Installation - Agilent Technologies VacIon Plus 800 Manual Del Usuario

Instructions for Use

Short Circuits

If there is a short circuit between the anode and the cathode or, in the case of the
StarCell, between the cathode and the pump body, the short-circuit current of the
control unit will be drawn and low voltage will be indicated. If a short circuit exists in
the control unit or high voltage cable and connector, low voltage will also be
observed when the high voltage connector is disconnected from the pump (refer to
the control unit manual).
An ohm-meter reading on the pump feedthrough may not be effective in finding a
short. Short circuits may be caused by mechanical shock to the pump. If the pump
is shorted, contact Agilent.

Typical Installation

A typical installation is shown in the following figure and consists of:
1 VacIon Plus pump.
2 Ion pump control unit.
3 Clean roughing pump (typically a turbomolecular pump).
4 Thermocouple gauge, able to indicate the pressure from atmosphere to 1E-3
mbar range.
5 Metallic valve to seal off the roughing pump from the vacuum chamber.
Roughing lines are usually made of stainless steel or copper tubing or other low
vapor pressure material.
6 High voltage cable.
7 Primary backing pump (e.g. a scroll pump).
8 High vacuum gauge (e.g. Agilent UHV24 or UHV24P).
9 Vacuum chamber.
A metallic valve to seal off the ion pump from the rest of the system may also be
installed if required.
Agilent VacIon Plus 800 User Manual 195